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Globally, the encouragement of using renewable fuels like biodiesel for diesel engines is driven by concerns over the fossil fuel depletion and harmful emissions. Additionally, the utilization of renewable fuel additives like diethyl ether has the potential to enhance fuel properties and boost engine performance. The aim of this paper was to construct a computer simulation using Ricardo Wave program in order to predict the performance and nitrogen oxides (NOx) emission of a diesel engine fuelled by a diesel‐biodiesel blend and a diethyl ether (DEE) as a fuel additive. The computer model was validated by comparing the simulation engine performance and NOx emission results against the corresponding experimental data for diesel, diesel‐biodiesel blend with 30% biodiesel proportion (B30), and two blends of diesel‐biodiesel‐DEE with DEE proportions of 5% and 10% on a volume basis. Also, the effect of varying the inlet air pressure on engine performance and NOx emission was compared for all investigated fuels. It was numerically demonstrated that using the DEE with an optimum proportion of 5% enhanced engine performance as it decreased engine fuel consumption by 5.9% and increased engine thermal efficiency by 9.6% compared to diesel fuel at engine full load condition. Also, a significant reduction of 20.5% in NOx emission resulted from the addition of DEE. Increasing the inlet air pressure increased engine power and decreased engine fuel consumption for all investigated fuels. Increasing the inlet air pressure from 1 to 3 bar increased engine brake thermal efficiency by almost 20% for all tested fuels. However, NOx emission increased slightly within a range from 1.7% to 7% for the different investigated fuels. [ABSTRACT FROM AUTHOR]

In this article, the three-stage explosion limits of diethyl ether (a typical alternative fuel with a high cetane number and high energy density) are taken as the research object. A comprehensive and in-depth analysis of the double negative temperature coefficient (NTC) behavior of the cool flame region and hot ignition region, through the detailed kinetic analysis, have been carried out. The results show that with the increase of the equivalence ratio, the double NTC phenomenon becomes more remarkable. In very lean conditions, such as the equivalence ratio of less than 0.5, the boundary between the first NTC region and the second NTC region becomes obscure, and a deeper single NTC phenomenon is formed as these two NTC regions merge. The whole explosion limit curve shifts to higher pressure conditions with the increase of the addition of inert gas. The NTC phenomenon in the moderate temperature region becomes more significant and the boundary between these two NTC regions is more obvious. In addition, the hot flame explosion limit also shows such two NTC response. The heat release rate (HRR) profile exhibits three-stage, two-stage, single-stage ignition, or non-ignition depending on the initial conditions. To elucidate the differences in the ignition process between the different explosion limit regimes, the sensitivity and reaction pathway analyses are performed. This study not only provides insight into the oxidation characteristics of ether fuels, but also provides theoretical support for high-performance engines. [ABSTRACT FROM AUTHOR]

Today, the tightening of exhaust emission regulations in engines directs researchers to alternative fuel types. In this study investigated the impact of blending diesel fuel with bioethanol and diethyl-ether on combustion parameters and exhaust emissions in a single-cylinder DI (direct injection) diesel engine. Both numerical and experimental analyses were used to compare the in-cylinder pressure and heat release rate of various fuel blends. Fuel spray/temperature/equivalence changes in the cylinder for different crank angles were created for different fuel types. The analysis was examined various parameters such as in-cylinder pressure, temperature, heat release rate, mass fraction burned, fuel spray formations, and equivalence ratio at variable crank angles. Results showed that all blended fuels exhibited a decrease in in-cylinder maximum pressure, temperature, and heat release rates compared to 100% diesel fuel, with an increase in mass fraction burned. CO2 emissions of D90E10 (90% diesel fuel + 10% bioethanol), D80E20 (80% diesel fuel + 20% bioethanol), D80E10DEE10 (80% diesel fuel 10% bioethanol + 10% diethyl ether) and D85E10DEE5 (85% diesel fuel + 10% bioethanol + 5% diethyl ether) fuelled engine were decreased rates 2%, 2.9%, 5% and 3.8% compared to D100 (100%diesel fuel) operation, respectively. Also, the maximum pressure in the chamber was decreased rate 3% in D80E10DEE10 fuel operation, compared to diesel fuel. Based on FTIR (Fourier Transform Infra-Red) data, the lubricating oil analyses showed that there was no significant decline in oil performance after 110 h of operation with different fuel types. However, a closer examination of the AVL FIRE program data and the EDX (Energy Dispersive X-Ray) analysis of the first ring uncovered that the wear patterns observed on the ring while using D100 fuel were heavily influenced by temperature and pressure parameters. This was particularly noticeable when compared to blended fuels that included bioethanol. [ABSTRACT FROM AUTHOR]

This research investigated the performance of bentonite and Al-PILC as catalysts in ethanol conversion to diethyl ether through a dehydration reaction. The natural bentonite was intercalated with the pillaring agent Keggin-ion Al13 to obtain Al-intercalated bentonite. Al-intercalated bentonite has been synthesized using conventional stirring and ultrasonication. Al-intercalated bentonite was calcined at 400 °C for 4 h to produce Al2O3 pillared bentonite (Al-PILC). The dehydration reaction was conducted using a 0.2 g catalyst and 10 mL of ethanol with a nitrogen gas flow rate of 20 mL/min at various reaction temperatures (200, 225, and 250 °C) using a fixed bed microreactor. The characterization results reveal that Al-PILC synthesized by sonochemistry exhibits significantly higher surface area and total acidity values than bentonite and Al-PILC synthesized by conventional methods because of the formation of stable Al2O3 pillars in the interlayer spaces of bentonite. The sonochemically synthesized Al-PILC produces optimum ethanol conversion and diethyl ether yield of 46.05% and 41.11%, respectively. The conversion of ethanol and diethyl ether yield reaches an optimum result at 225 °C. Based on this study, the pillarization of bentonite using Al2O3 can enhance its catalytic properties toward diethyl ether production. [ABSTRACT FROM AUTHOR]

The objective of this study is to improve the performance of a diesel engine with direct injection using diethyl ether as an additive and pongamia methyl ester as a fuel and to minimize emissions. The optimization process considers two input factors, the load and the fuel, and evaluates nine response parameters, including brake-specific fuel consumption, brake thermal efficiency, carbon monoxide, oxygen, nitrogen oxides, smoke, and exhaust gas temperature. A series of investigations were carried out to determine the appropriate reaction. Based on the test results, a grey relational analysis was performed to determine the optimal combination of fuel and load. The analysis involved the application of grey relational grade in order to simplify the problem of multiple responses to a single response. The integration of the grey relational grade and the signal-to-noise ratio provides the performance index. The experiment showed that the most effective solution is obtained by using Pongamia methyl ester fuel with a 10% addition of diethyl ether at a load of 30 kg. [ABSTRACT FROM AUTHOR]

The compression‐ignition properties of crude Jatropha and camphor oil blends with di ethyl ether (DEE) added is covered in this research. Six fuel samples are made based on volume: 90% C70J30 with 10% diethyl ether (C70J30 + 10% DEE), 90% C30J70 with 10% di‐ethyl ether (C50J50 + 10% DEE), 70% Camphor oil with 30% crude Jatropha oil (C70J30), 50% Camphor oil with 50% crude Jatropha oil (C50J50), 30% Camphor oil with 70% crude Jatropha oil (C30750). A four‐stroke, one‐cylinder, naturally aspirated, compression‐ignition engine operating at a constant 1500 rpm with a load range of 0%–100% with a 25% interval is used for the experiment. According to test findings, the C70J30 + 10% DEE has the lowest brake‐specific energy consumption of 11.68 kJ/kWh, the maximum energy efficiency of 62.56%, and the highest thermal efficiency of 30.81%. Compared to the other biofuels examined, this puts it more in line with diesel. Additionally, blends of crude Jatropha oil and camphor oil showed at least 4.46 g/kWh of CO, 0.259 g/kWh of HC, and 74% of smoke opacity when DEE was added. However, it raises CO2 to 0.792 kg/kWh and NO to 9.54 g/kWh. The greatest peak pressure and quickest heat release are produced by adding more DEE as a fuel additive and using a larger percentage of camphor oil. It also increases the coefficient of variation of the peak pressure throughout 100 cycles. All things considered, the C70J30 + 10% DEE's CI engine features are better. [ABSTRACT FROM AUTHOR]

This research addresses the challenges of emission reduction and fuel consumption in engines by investigating modifications in fuel properties using graphene oxide (GO) nanoparticles and diethyl ether as oxygenated additives. Characterization tests were conducted to determine the size, energy, and content of graphene and oxygen molecules in synthesized GO nanoparticles. Pongamia Pinnata Oil Methyl Ester (POME) was prepared through a transesterification process and blended with diesel to obtain a B20 blend. This POME (B20) was further mixed with GO nanoparticles at 40, 80, and 100 mg L-1 concentrations and supplemented with 3 vol% of diethyl ether. The blending process involved stirring, bath sonication, and probe sonication. A Common Rail Direct Injection diesel engine was employed with a toroidal combustion chamber and a 7-hole fuel injector nozzle. The engine maintained a steady speed of 1800 rpm, an injection timing set at 23ºbTDC, and a fixed compression ratio of 18.5 while operating under five different loads. At maximum loading conditions, the addition of 100 ppm GO nanoparticles and 5 vol% of Diethyl ether resulted in a 19.7% enhancement in Brake Thermal Efficiency (BTE) and a 10.71% reduction in Brake Specific Fuel Consumption. Furthermore, there was a significant reduction observed in CO, HC, and smoke emissions by 47.9%, 70.3%, and 23.8%, respectively. The addition of these fuel additives increased combustion characteristics such as Heat Release Rate, Cumulative Heat Release Rate, peak pressure, and in-cylinder pressure, while concurrently decreasing the Ignition Delay period and Exhaust Gas Temperature. [ABSTRACT FROM AUTHOR]

Diethyl ether (DEE) can be used in diesel engines as a fuel or fuel additive. The review study was compiled from the findings of several studies in this area. The diverse techniques are employed to mitigate the detrimental pollutants emitted by diesel engines. The first approach to reducing emissions involves altering the fuel system and engine design to improve combustion, but this is an expensive and time–consuming process. The utilization of various exhaust gas devices, such as a particle filter and catalytic converter, is necessary for the second way. However, the engine performance could be negatively impacted by these tools. Additionally, these exhaust devices increases the vehicle and maintain costs. The use of different alternative fuels or fuel additives is the third way that reduces emissions while improving engine performance. The particulate matter (PM), smoke, and nitrogen oxides (NOx) are the main environmental pollutants released by diesel engines into the atmosphere. The decreasing PM and NOx emissions at the same time is practically very difficult. The majority of researches indicate that using alternative fuels, such as natural gas, biogas, and biodiesel, or blending additives with conventional or alternative fuels, is the best way to reduce emissions. However, the characteristics of the fuel have a significant influence on cycle variations, which have a significant impact on engine performance, fuel economy, and emissions. Therefore, it is very important that the results of studies on the impact of DEE on cyclic variation are evaluated together to practice applications and to guide future studies. As a result, the primary focus of this study is on the usage of DEE as a fuel or fuel additive with different diesel engine fuels. The aim of this review is to investigate, using the available knowledge in literature, how DEE affects cyclic variations. [ABSTRACT FROM AUTHOR]

To address the global demand for sustainable energy, integrating biogas into internal combustion engines is becoming more important. Homogeneous Charge Compression Ignition (HCCI) engines, known for high efficiency and low emissions, offer a promising solution. This study investigates the optimal injector location for using biogas in HCCI engines, with diethyl ether (DEE) as the pilot fuel, evaluating three positions: (i) at the port, (ii) 6 cm away (Manifold 1), and (iii) 10 cm away (Manifold 2). Through experiments and simulations, the impact of injector location on engine performance is analyzed across various parameters, including methane fractions, engine loads, and exhaust gas compositions. Results show that port injection achieves the highest first law and exergy efficiencies but increases emissions of hydrocarbons (HC), carbon monoxide (CO), and smoke. At 15 Nm load, Manifold 1 shows a 27.34 % reduction in exergy efficiency compared to port injection, while Manifold 2 exhibits an 18.49 % decrease at higher loads. Despite lower efficiencies, Manifold 1 effectively reduces harmful emissions. The study also considers exergo-economic and sustainability aspects, highlighting that while port injection is optimal for efficiency, Manifold 1 excels in minimizing HC and CO emissions, with a 50 % reduction in HC and 71.43 % reduction in CO emissions at 15 Nm load compared to port injection. Manifold 2 achieves the lowest smoke emissions across all loads. This investigation provides crucial insights into optimizing HCCI engines for biogas utilization, emphasizing injector location, fuel composition, and operating parameters to enhance performance and reduce environmental impact.

Modification of a natural zeolite from Klaten, Indonesia, as a catalyst in the dehydration of ethanol to produce diethyl ether (DEE) has been conducted. Raw Klaten natural zeolite (ZA) was modified using 1 and 2 M of an ammonium chloride solution for 24 h while stirring for 18 h, then calcined at 500 °C for 5 h under N2 gas flow produced HZA1 and HZA2 catalyst, respectively. The catalysts were characterized using XRD, BET surface area, SEM-EDX, XRF, FTIR and gravimetric acidity test using ammonia-based vapor. The dehydration process was conducted under variations of temperature (200, 250, and 300 °C) and catalyst mass of 0.1, 0.2, and 0.4 g for 20 mL of 96% ethanol. The HZA1 catalyst produced the highest yield of DEE (2.41%) at 250 °C and 0.1 g catalyst. This catalyst showed needle-like of 66.22 nm crystal size, consisting of 32.57% mordenite, the highest surface area (48.32 m2/g), crystallinity (32.93%) and Brønsted acid sites (2.75 mmol/g), the lowest pore diameter (1.77 nm) and Si/Al mol ratio (4.03). The HZA1 catalyst can be used repetitively and produced DEE yield at the second and third runs (2.40 and 2.61%).

Hyperpolarized 129Xe gas was FDA‐approved as an inhalable contrast agent for magnetic resonance imaging of a wide range of pulmonary diseases in December 2022. Despite the remarkable success in clinical research settings, the widespread clinical translation of HP 129Xe gas faces two critical challenges: the high cost of the relatively low‐throughput hyperpolarization equipment and the lack of 129Xe imaging capability on clinical MRI scanners, which have narrow‐bandwidth electronics designed only for proton (1H) imaging. To solve this translational grand challenge of gaseous hyperpolarized MRI contrast agents, here we demonstrate the utility of batch‐mode production of proton‐hyperpolarized diethyl ether gas via heterogeneous pairwise addition of parahydrogen to ethyl vinyl ether. An approximately 0.1‐liter bolus of hyperpolarized diethyl ether gas was produced in 1 second and injected in excised rabbit lungs. Lung ventilation imaging was performed using sub‐second 2D MRI with up to 2×2 mm2 in‐plane resolution using a clinical 0.35 T MRI scanner without any modifications. This feasibility demonstration paves the way for the use of inhalable diethyl ether as a gaseous contrast agent for pulmonary MRI applications using any clinical MRI scanner. [ABSTRACT FROM AUTHOR]

Numerous studies derived from medicinal herbs have been conducted to explore bioactive compounds as potential alternatives to synthetic drugs, aiming to mitigate harmful side effects and alleviate economic burdens. In this study, we assessed the safety and potential biological activities of extracts from Fomes fomentarius L. (FFL). The FFL extracts were obtained through various ethanol concentrations, as follows: 0%, 30%, 50%, 70%, and 100%, respectively. All extracts did not induce mutagenicity even up to 5 mg/plate concentration. In the assessment of antioxidant activity, only the hot water extract exhibited weaker antioxidant activity than the other ethanol extracts. Notably, all extracts exhibited significant antimutagenetic effects only with a metabolically active enzyme system (S9 mix). The condition of 70% ethanol extract displayed the most robust antimutagenic activity; thus, the extract was sequentially fractionated with solvents of varying polarities to isolate inhibitory components. After the fractionization, the diethyl ether and butanol fractions effectively suppressed the growth of mutated colonies, suggesting that those such as essential oils, vitamins, alkaloids, and flavonoids can be considered major active compounds. Overall, our study demonstrated that FFL extracts induce potent antioxidant and antimutagenic effects. Further investigations are warranted to verify specific active compounds which induce an antimutagenic effect. Our findings provide valuable insights into FFL as a promising source for potential functional food development. [ABSTRACT FROM AUTHOR]

Alternative fuels and energy sources are necessary to combat climate change and deplete fossil fuel stocks. Greenhouse gasses and environmental degradation are consequences of traditional energy sources, making the need for sustainable alternatives critical. Another feasible solution to lessen the environmental impact of transportation and industry is biodiesel and biofuels. Using an efficient approach for trash disposal is another important consideration. The manufacturing of many things has skyrocketed, leading to an explosion of trash. For a long time, waste polymers were the material of choice for many items due to their low production costs and high adaptability. The purpose of this article is to promote a more sustainable environment by addressing the challenges of conventional fuel scarcity and the disposal of polymer waste. Diesel engine's performance was studied in relation to waste polymer fuels recovered from different waste grades of waste polymer with diethyl ether added. Diesel fuel and a blend of waste polymer fuel, typically 20% and 40% by weight, are combined to provide the primary fuel. The diethyl ether additives, in concentrations of 10% and 20%, were mixed with waste polymer fuel to enhance the performance of the engines, serving as an alternative fuel source. [ABSTRACT FROM AUTHOR]

Advanced biofuels have the potential to supplant significant fractions of conventional liquid fossil fuels. However, the range of potential compounds could be wide depending on selected feedstocks and production processes. Not enough is known about the engine relevant behavior of many of these fuels, particularly when used within complex blends. Simulation tools may help to explore the combustion behavior of such blends but rely on robust chemical mechanisms providing accurate predictions of performance targets over large regions of thermochemical space. Tools such as automatic mechanism generation (AMG) may facilitate the generation of suitable mechanisms. Such tools have been commonly applied for the generation of mechanisms describing the oxidation of non‐oxygenated, non‐aromatic hydrocarbons, but the emergence of biofuels adds new challenges due to the presence of functional groups containing oxygen. This study investigates the capabilities of the AMG tool Reaction Mechanism Generator for such a task, using diethyl ether (DEE) as a case study. A methodology for the generation of advanced biofuel mechanisms is proposed and the resultant mechanism is evaluated against literature sourced experimental measurements for ignition delay times, jet‐stirred reactor species concentrations, and flame speeds, over conditions covering φ = 0.5–2.0, P = 1–100 bar, and T = 298–1850 K. The results suggest that AMG tools are capable of rapidly producing accurate models for advanced biofuel components, although considerable upfront input was required. High‐quality fuel specific reaction rates and thermochemistry for oxygenated species were required, as well as a seed mechanism, a thermochemistry library, and an expansion of the reaction family database to include training data for oxygenated compounds. The final DEE mechanism contains 146 species and 4392 reactions and in general, provides more accurate or comparable predictions when compared to literature sourced mechanisms across the investigated target data. The generation of combustion mechanisms for other potential advanced biofuel components could easily capitalize on these database updates reducing the need for future user interventions. [ABSTRACT FROM AUTHOR]

The systemic electrical signal propagation in plants (i.e., from leaf to leaf) is dependent on GLUTAMATE RECEPTOR-LIKE proteins (GLRs). The GLR receptors are the homologous proteins to the animal ionotropic glutamate receptors (iGluRs) which are ligand-gated non-selective cation channels that mediate neurotransmission in the animal's nervous system. In this study, we investigated the effect of the general anaesthetic ketamine, a well-known non-competitive channel blocker of human iGluRs, on systemic electrical signal propagation in Arabidopsis thaliana. We monitored the electrical signal propagation, intracellular calcium level [Ca2+]cyt and expression of jasmonate (JA)-responsive genes in response to heat wounding. Although ketamine affected the shape and the parameters of the electrical signals (amplitude and half-time, t1/2) mainly in systemic leaves, it was not able to block a systemic response. Increased [Ca2+]cyt and the expression of jasmonate-responsive genes were detected in local as well as in systemic leaves in response to heat wounding in ketamine-treated plants. This is in contrast with the effect of the volatile general anaesthetic diethyl ether which completely blocked the systemic response. This low potency of ketamine in plants is probably caused by the fact that the critical amino acid residues needed for ketamine binding in human iGluRs are not conserved in plants' GLRs. [ABSTRACT FROM AUTHOR]

This study aimed to change the ignition delay time by adding toluene and diethyl ether to diesel fuel and to improve the exhaust emission (CO, CO 2 , HC, smoke, and NOx) values by adding H 2 , H 2 +HHO and H 2 +HHO + O 2 gases added from the intake manifold. For this purpose, a mixing chamber has been added in front of the intake manifold. HHO is produced from a hydrogen generator, and H 2 and O 2 gas supplied from a tube is supplied to the engine running on liquid fuel. H 2 , HHO and O 2 gases were added from the intake manifold to the engine using di ethyl ether and toluene, which were added to the diesel fuel at a rate of 5% and 10% by volume. Under these conditions, the engine was started at an engine speed of 3000 rpm at engine loads of 1000 W, 2000 W and 3000 W. The results showed that all exhaust emission values decreased with adding toluene and diethyl ether to diesel fuel, and the tendency to decrease continued even more with the addition of H 2 , H 2 +HHO and H 2 +HHO + O 2. It has been found that among all fuel mixtures, H 2 + HHO + O 2 gas Decoupled fuel mixtures are effective in obtaining the best results in terms of exhaust emissions. In this case, with the addition of O 2 , combustion efficiency increased and emissions decreased. • The use of hydrogen in internal combustion engines. • The effects of the addition of H 2 , H 2 +HHO, and H 2 +HHO + O 2 to a diesel engine using toluene and diethyl ether as pilot fuel. • The effect of oxygen-rich hydrogen with additives with low evaporation temperature on emissions. [ABSTRACT FROM AUTHOR]

Cleaner energy generation on light-duty off-road diesel engines is one of the objectives of this study, which utilizes renewable diethyl ether (DEE) as a replacement for diesel to minimize the reliance on fossil diesel fuel. In an aircooled single-cylinder diesel engine, various DEE mixes of 5, 10, 15, 20 and 25% were attempted and evaluated under varying loads (0, 25, 50, 75 and 100%) in an effort to enhance the performance and emission characteristics of agriculture diesel engines and lower the environmental effect of harmful emissions. The injection pressure was optimized using computational fluid dynamics (CFD), and performance and emission outcomes were optimized through response surface methodology (RSM) techniques. The experimental results found that brake thermal efficiency and specific fuel consumption were enhanced for a higher proportion of DEE blends under increasing loads. In addition, increasing the engine load decreased CO emissions while increasing carbon dioxide (CO2), hydrocarbon (HC), and nitrogen oxide (NOx) emissions. Reduced CO, NOx, and HC emissions and increased CO2 were realized in the blended fuel samples compared to those of pure diesel fuel at increasing DEE percentages. In summary, the utilization of a 15% DEE blend and the optimization of the injection pressure to 210 bar resulted in a notable improvement of 10% in thermal efficiency and a decrease in emissions by 5% when compared to other parameters. [ABSTRACT FROM AUTHOR]

The main objective of the present research work is to utilise the produced bio-oil from microwave pyrolysis of Karanja, a non-edible seed, as fuel for diesel engines by increasing some up-gradation in the quality of the fuel. The emulsification process is carried out to improve the stability of the diesel–bio-oil blend using SPAN 80 and TWEEN 80, which lasted for 28 days without any layer separation termed as EKB20. The addition of 5% DEE and 10% DEE into EKB20 is done to enhance the combustion characteristics of the diesel engine. The produced bio-oil fuels were tested in a Kirloskar make, four-stroke, single-cylinder, direct injection diesel engine of 5.2 kW rated power output. The addition of DEE reduces the peak pressure by 4 bar and increases the heat release rate due to the higher volatility of DEE. At full load conditions, the thermal brake efficiency improved by 9.31% and 14.11%, respectively, compared to EKB20. Adding 5% DEE and 10% DEE at the rated power output reduced the smoke density by 18.42% and 60.25%, respectively, compared to EKB20 and 5% and 4% compared to diesel. The addition of 5% DEE and 10% DEE shows a 39% and 51% increase in NOX concentration and a 90% reduction in CO emission at the maximum brake power output. Hence, it is concluded that the fuels EKB20 + 5% DEE and EKB20 + 10% DEE can be used as alternative fuels for diesel engines. [ABSTRACT FROM AUTHOR]

In this study, experiments are carried out to explore the impact of incorporating Diethyl Ether (DEE) as an additive into biodiesel-Straight Vegetable Oil (SVO) blends derived from Pongamia seeds. Our objective was to assess the influences of additives on the engine performance characteristics of a CI engine. The different fuel blends such as BD80+SVO15+DEE5 (comprising 80% biodiesel, 15% SVO, and 5% DEE), BD80+SVO10+DEE10, BD60+SVO35+DEE5, and BD60+SVO30+DEE10 (consisting of 60% biodiesel, 30% SVO, and 10% DEE) are tested and compared these blends with conventional biodiesel and Straight Vegetable Oil blends (BD80+20% SVO and BD60+40%SVO). The inclusion of DEE as an additive had a noticeable impact on engine performance. It significantly improved brake power, reduced Brake-Specific Fuel Consumption (BSFC), lowered Brake Specific Energy Consumption (BSEC), and increased Brake Thermal Efficiency (BTE). Additionally, all the blends containing DEE as an additive demonstrated decreased emissions of Nitrogen Oxides (NOx) and Carbon Monoxide (CO), with a slight increase in Hydrocarbon (HC) emissions. This research highlights the comparative suitability of DEE as an additive for enhancing the suitability of biodiesel-SVO blends as a fuel source for diesel engines. [ABSTRACT FROM AUTHOR]

One of the biodiesel forms considered for research in the recent past is mixture of Avocado oil with diesel because the waste produced by avocado fruit is very huge which is not limited to the peel and stone. This paper deals with the comparison of performance and emissions of mixtures with different percentages of diesel, avocado oil and diethyl ether (DEE). The biodiesel is prepared through the process of transesterification process under acid-base catalyst. The performance characteristics considered for comparison are Brake Specific Fuel Consumption (BSFC) and Brake Thermal Efficiency (BTE). The emissions considered are smoke, Carbon monoxide (CO), Nitrogen Oxides (NOx), Carbon dioxide (CO2) and Unburned Hydrocarbons (UBHC). The results show that mixing avocado biodiesel in the prescience of Di-ethyl ether with diesel proved to be encouraging. Different compression ratios, namely, 17%, 17.5% and 18% were assessed and the results are reported. [ABSTRACT FROM AUTHOR]

In the field of biodiesel, the oxygenised alternatives, dimethyl ether (DME) and diethyl ether (DEE), are the promising alternative due to high Cetane number and oxygen content. In this research, experimental analysis is done for different fuel blends of Jatropha oil and DEE as additives. Biodiesel of 10, 15, and 20% with 10% DEE is used by mixing with diesel named as A1, A2 and A3. For 20% of DEE with same % of biodiesel, second batch of blends is prepared as B1, B2 and B3. These blends are prepared, and their physicochemical properties are tested. The compression ratio (CR) at 16, 17 and 18 is used as input for engine performance and emission analysis. Load on the engine is increased from 3 kg to 12 kg as full load for all blends and diesel. Results shows that engine gives better performance at higher load and higher CR. A3 blend shows the highest value of BTE than other fuel blends and diesel at all CR and loads. A3 blend shows the lowest value of BSFC compared to other fuel blends at CR 16 and CR 18. Performance of A3 and B2 fuel blends is better than all other fuel blends. [ABSTRACT FROM AUTHOR]

Alternative fuels can be produced from both non-edible feedstocks and edible crops. The higher production costs and contaminating nature of vegetable biofuels, which cause engine component failure, make it conceivable to encourage the synthesis of biodiesel from non-edible sources. One of the most widely utilized alternative fuels is Jatropha biofuel, which has performance levels comparable to diesel fuels and can be used with CI (Compression Ignition) engines without any modifications. However when it comes to oxidative stability properties that impact shelf life and commercialization, the majority of biodiesels—including Jatropha—are lacking. Therefore, the objective of this study was to enhance the oxidative stability and other physicochemical parameters, such performance and emission characteristics, of Jatropha biodiesel with diesel blends by adding additives like DEE (diethyl ether) and MA (moringa oleifera antioxidant). The seeds of jatropha and moringa were harvested by hand and then mechanically extracted with a screw press. A conical flask containing the precisely weighed amount of oil is filled with 50 mL of neutral alcohol. The combination is then heated for an hour using a water condenser over a bath. Using phenolphthalein indicator, the contents are titrated with KOH solution after cooling. Weight of oil taken (w)/volume of KOH used (mL) × normality of KOH is the formula used to determine the acidity value of jatropha oil. It is therefore below the minimum level set by ASTM D 675, which is 2.5 mg KOH/g. Methanol was used in the transesterification process to produce biodiesel, and potassium hydroxide (KOH) was used as a catalyst. Then, using 5 % DEE and 10 % MA additives, the physicochemical properties of jatropha biodiesel—such as density, kinematics viscosity, calorific value, and oxidative stability—were characterized. The percentage of improvement of the biodiesel's mentioned properties with these additives was 0.68 %, 2.8 %, 0.73 %, and 33.8 %, respectively. The brake thermal efficiency (BTE) of B40MA10DEE05D45 increased by 8.52 % whereas the brake specific fuel consumption (BSFC) of B50MA10DEE05D35, which is Made up of 44 % diesel, 50 % jatropha biodiesel, 5 % DEE, and 10 % MA fuels, declined by 5.14 %. As a result of these additions, the blended fuel's CO, HC, and NOx emissions were reduced by 3.51 %, 2.25 %, and 8.64 %, respectively. Therefore, a 20 % blend of Jatropha biodiesel and diesel containing antioxidants from Moringa can be used in compression ignition engines without the need for engine modifications and with high oxidation stability.

The purpose of this research is to look at performance and emission characteristics of Ethiopian Prosopis Juliflora biodiesel (JFB) blended with diethyl ether (DEE) additive in varying proportions. The experiment includes testing different biodiesel blends and DEE additive concentrations, namely D100, B100, B20DEE5, B20DEE10, B20DEE15, and B20DEE20. FT-IR (Fourier transform infra-red) analysis was employed to investigate whether necessary functional groups for a biodiesel were present. Rheometer analysis was employed to investigate how shear rate and temperature affect the shear stress and viscosity of blended fuels employed. Results show that D100 exhibits the highest brake thermal efficiency (BTE) across the load range, while B100 has the lowest. Although DEE blended fuels have lower BTE than diesel, the results are comparable. Notably, at 50 % load, B20DEE10 achieves a BTE of 31.4 %, closer to D100 at 36.7 %. Brake-specific fuel consumption (BSFC) decreases as load increases up to 50 %. While BSFC for JFB, B20, and blended fuels is higher than D100 across all engine loads, B20DEE10 shows a comparable result of 203 g/kWh versus 181 g/kWh for D100 at 50 % load. Emission levels for CO2, HC, and CO are higher for diesel compared to blended fuels, with NOx being lower for D100 and all DEE blended fuels. DEE’s higher Cetane rating and latent heat of evaporation along with shorter ignition time and faster heat release rate seems to result in lower NOx emissions, especially for medium to higher loads. At full load, B20DEE10 exhibits the lowest smoke opacity value. Additionally, FT-IR analyses confirm the presence of necessary functional groups in biodiesel and the rheological analysis shows a decrease in viscosity with increasing temperature and a shear-thinning behavior for JFB across a range of shear rates with a viscosity ranging from 203.4 to 47.5 mPa.s, with a shear rate range of 10–150 s−1.

The objective of this study is to improve the performance of a diesel engine with direct injection using diethyl ether as an additive and pongamia methyl ester as a fuel and to minimize emissions. The optimization process considers two input factors, the load and the fuel, and evaluates nine response parameters, including brake-specific fuel consumption, brake thermal efficiency, carbon monoxide, oxygen, nitrogen oxides, smoke, and exhaust gas temperature. A series of investigations were carried out to determine the appropriate reaction. Based on the test results, a grey relational analysis was performed to determine the optimal combination of fuel and load. The analysis involved the application of grey relational grade in order to simplify the problem of multiple responses to a single response. The integration of the grey relational grade and the signal-to-noise ratio provides the performance index. The experiment showed that the most effective solution is obtained by using Pongamia methyl ester fuel with a 10% addition of diethyl ether at a load of 30 kg.

To accelerate the energy transition, starting February 1, 2023, the Indonesian government has made it mandatory to use biodiesel (B35). Biodiesel differs from diesel oil, especially its greater viscosity and density, lower heating value, and high NOx emission. Therefore, this research has been carried out by adding the additive diethyl ether (DEE) to B35 to reduce the viscosity and density, increase the cetane number, and reduce emissions. The effects of diethyl ether on engine performances have been evaluated, including parameters of torque, power, brake thermal efficiency, brake-specific fuel consumption, exhaust emissions, and lubricants. The fuels used are B35 (35% FAME palm oil + 65% diesel oil), and B35 + DEE, with a DEE volume percentage of 3% to 6%. Diesel fuel (B0) was used as a comparison. Tests were carried out in the engine performance test laboratory using the heavy-duty diesel engine Komatsu SAA12V140E-3 at various engine speeds. The test results showed that adding diethyl ether slightly increases the average maximum power, increases brake thermal efficiency, and reduces brake-specific fuel consumption and emissions compared to B35. Very significant effects were seen in NOx and SO2 exhaust emissions. At maximum load, the mixture with 4% diethyl ether gave the greatest brake thermal efficiency, the lowest brake-specific fuel consumption, and the greatest reduction in NOx and SO2 emissions, respectively 7.69%, 6.30%, 53.48%, and 40.89% compared to B35, and 2.24%, (-0.90%), 48.88% and 71.17% compared to B0, respectively. Evaluation of lubricating oil during the performance test did not show a significant difference for all types of fuel used.

To accelerate the energy transition, starting February 1, 2023, the Indonesian government has made it mandatory to use biodiesel (B35). Biodiesel has different characteristics from diesel oil, especially its greater viscosity and density, lower heating value, and high NOx emission. Therefore, this research has been carried out by adding the additive diethyl ether (DEE) to B35 to reduce the viscosity and density, increase the cetane number, and reduce emissions. The effects of diethyl ether on engine performances have been evaluated, including parameters of torque, power, brake thermal efficiency, brake-specific fuel consumption, exhaust emissions, and lubricants. The fuels used are B35 (35% FAME palm oil + 65% diesel oil), and B35 + DEE, with a DEE volume percentage of 3% to 6%. Diesel fuel (B0) was used as a comparison. Tests were carried out in the engine performance test laboratory using the heavy-duty diesel engine Komatsu SAA12V140E-3 at various engine speeds. The test results showed that adding diethyl ether slightly increases the average maximum power, increases brake thermal efficiency, and reduces brake-specific fuel consumption and emissions compared to B35. Very significant effects were seen in NOx and SO2 exhaust emissions. At maximum load, the mixture with 4% diethyl ether gave the greatest brake thermal efficiency, the lowest brake-specific fuel consumption, and the greatest reduction in NOx and SO2 emissions, respectively 7.69%, 6.30%, 53.48%, and 40.89% compared to B35, and 2.24%, (-0.90%), 48.88% and 71.17% compared to B0, respectively. Evaluation of lubricating oil during the performance test did not show a significant difference for all types of fuel used. [ABSTRACT FROM AUTHOR]

Numerous studies derived from medicinal herbs have been conducted to explore bioactive compounds as potential alternatives to synthetic drugs, aiming to mitigate harmful side effects and alleviate economic burdens. In this study, we assessed the safety and potential biological activities of extracts from Fomes fomentarius L. (FFL). The FFL extracts were obtained through various ethanol concentrations, as follows: 0%, 30%, 50%, 70%, and 100%, respectively. All extracts did not induce mutagenicity even up to 5 mg/plate concentration. In the assessment of antioxidant activity, only the hot water extract exhibited weaker antioxidant activity than the other ethanol extracts. Notably, all extracts exhibited significant antimutagenetic effects only with a metabolically active enzyme system (S9 mix). The condition of 70% ethanol extract displayed the most robust antimutagenic activity; thus, the extract was sequentially fractionated with solvents of varying polarities to isolate inhibitory components. After the fractionization, the diethyl ether and butanol fractions effectively suppressed the growth of mutated colonies, suggesting that those such as essential oils, vitamins, alkaloids, and flavonoids can be considered major active compounds. Overall, our study demonstrated that FFL extracts induce potent antioxidant and antimutagenic effects. Further investigations are warranted to verify specific active compounds which induce an antimutagenic effect. Our findings provide valuable insights into FFL as a promising source for potential functional food development.

The systemic electrical signal propagation in plants (i.e., from leaf to leaf) is dependent on GLUTAMATE RECEPTOR-LIKE proteins (GLRs). The GLR receptors are the homologous proteins to the animal ionotropic glutamate receptors (iGluRs) which are ligand-gated non-selective cation channels that mediate neurotransmission in the animal’s nervous system. In this study, we investigated the effect of the general anaesthetic ketamine, a well-known non-competitive channel blocker of human iGluRs, on systemic electrical signal propagation in Arabidopsis thaliana. We monitored the electrical signal propagation, intracellular calcium level [Ca2+]cyt and expression of jasmonate (JA)-responsive genes in response to heat wounding. Although ketamine affected the shape and the parameters of the electrical signals (amplitude and half-time, t1/2) mainly in systemic leaves, it was not able to block a systemic response. Increased [Ca2+]cyt and the expression of jasmonate-responsive genes were detected in local as well as in systemic leaves in response to heat wounding in ketamine-treated plants. This is in contrast with the effect of the volatile general anaesthetic diethyl ether which completely blocked the systemic response. This low potency of ketamine in plants is probably caused by the fact that the critical amino acid residues needed for ketamine binding in human iGluRs are not conserved in plants’ GLRs.

In this study, the effect of Margosa oil ethyl ester (MOEE) with oxygenated additive Diethyl ether (DEE) on the thermal performance, combustion, and emission characteristics of a direct-injection compression ignition engine (CIE) was examined. Experiments were performed under various engine loadings at a constant speed of 1500 rpm. Two-step transesterification process was followed for producing MOEE-based biodiesel from Margosa oil owing to its high free fatty acid content. Further, four different blends of MOEE and Diesel with fixed DEE concentration (5% by vol.) were fuelled in a CIE and compared its performance with Diesel. Results showed that the increase in MOEE proportion in the blends decremented the mean brake thermal efficiency and the maximum reduction was about 14.3% for MOEE20 as compared to diesel. Moreover, there was a decline in In-cylinder pressure and net heat release rate when MOEE20 fuelled in a CIE by up to 8.1% and 8.7% respectively. Emission results found that the MOEE blends emitted more oxides of nitrogen and carbon dioxide by up to 18.8% and 14.7% respectively with a major decrement in emissions of hydrocarbon by up to 41.2%. Overall, it is concluded that the fueling of MOEE20 could be the plausible option for swapping the diesel usage in CIE with an excellent reduction in emission despite a marginal drop in performance.

Biodiesel is widely known as the alternative fuel for the diesel engine, but it comes with its fair share of challenges. To minimize the pertinent drawbacks, fuel additives become an essential tool and help improve renewable fuel's properties. In this current research, biodiesel is obtained from rice bran oil and cotton seed oil, with diethyl ether as an additive. Diethyl ether is known for good oxygen content, high cetane number, and low viscosity. Experiments were performed on a variable compression ratio engine at a compression ratio of 18:1, and the injection pressure (170 bar, 180 bar, 190 bar and 200 bar) and the injection timing (20, 21, 22 and 23°bTDC) with four different dual biodiesel blends (5%, 10%, 15% and 20% by volume). Different ratios of 1%, 2.5% and 5% of diethyl ether with biodiesel combination were examined in a single-cylinder, four-stroke diesel engine. The engine emission and performance features were discussed at different loads and constant engine speeds. It was observed that using 5% of diethyl ether with biodiesel blends improved brake thermal efficiency, brake-specific fuel consumption and decreased carbon dioxide and oxides of nitrogen emissions. The reduction of oxides of nitrogen emission contributes to biodiesel's acceptability for the environment's benefit. This investigation found that diethyl ether, along with dual biodiesel blends, has a better viability in diesel engines. [ABSTRACT FROM AUTHOR]

In this study, the influences of the diethyl ether addition into pure gasoline were researched experimentally in a single cylinder, four stroke, air-cooled spark ignition engine. Experiments were conducted at wide-open throttle and different engine speeds of2400,2800,3200,3600 and 4000 rpm. The effects of diethyl ether as an additive on engine torque, specific fuel consumption (SFC), thermal efficiency, CO, CO2 and HC emissions were observed. Test results presented that engine torque and power first increased and then decreased with the addition of diethyl ether. SFC increased by about 4.18%, 7.44%, 11.39% and 14.41% with DEE10, DEE20, DEE30 and DEE40 compared to pure gasoline at 2800 rpm respectively. Remarkable reduction were observed on CO and HC emissions with the addition of diethyl ether into gasoline. CO was reduced by 0.67%, 3.39%, 10.61% and 11.11% with DEE10, DEE20, DEE30 and DEE40 compared to gasoline at 4000 rpm respectively. Similarly, HC decreased by 3.70%, 8.82% and 10.58% with DEE20, DEE30 and DEE40 compared to gasoline at 4000 rpm respectively. Diethyl ether presented positive and satisfying results in view of exhaust emission compared to pure gasoline. However, it was found that thermal efficiency decreased and specific fuel consumption increased with diethyl ether addition. In addition, it was seen that diethyl ether can be used as an additive without modification in spark ignition engines. [ABSTRACT FROM AUTHOR]

In compliance with proposed targets of green energy and reduced emissions during the Glasgow summit, the study of blended fuels in internal combustion engines is of great significance. To address this issue, a detailed study of the engine performance and exhaust emissions has been conducted with ternary fuel blends of diethyl ether (DEE), waste soybean cooking oil (WSCO) biodiesel, and ultra-low sulfur diesel (ULSD). Ternary blends were prepared by adding 0–15% v/v DEE with the B35 blend (35% v/v WSCO biodiesel + 65% v/v ULSD), and tests were carried out with 15% EGR. The RSM based modeling and experimental approaches have been used for analysis. With a desirability of 0.961, the ternary blend DEE10B35EGR15 (10% v/v DEE + 90% v/v B35 at 15% EGR) was found to be an optimal blend. The measured responses are 0.272 kg/kWh, 31.47%, 18.94 HSU%, 91 ppm, 0.030%, and 24 ppm for brake specific fuel consumption (BSFC), brake thermal efficiency (BTE), smoke, nitrogen oxides (NOx), carbon monoxide (CO), and hydrocarbon (HC) emissions, respectively. An innovative approach to analysis and quantifying the responses to ternary blends with EGR has been presented in the form of mathematical equations for future use and scope. [ABSTRACT FROM AUTHOR]

Multi-stage ignition and/or double NTC (negative temperature coefficient) behavior resulted from the low-temperature oxidation of ether compounds are still not clearly explained. We have investigated the oxidation mechanism of a stoichiometric DEE (diethyl ether)/air mixture by using a micro flow reactor with a controlled temperature profile to see the detail of low-temperature weak flame structure. The simulation was also performed to understand the chemical kinetics mechanism of observed weak flame structure. Chemiluminescence measurement showed separated weak flame in the temperature range of 600 K–800 K. The simulation also qualitatively reproduced this separated weak flame, and showed four peak of heat release. From the reaction flow analysis, it was found that (1) O-O bond scission reaction of keto-hydroperoxide produced by DEE, (2) O-O bond scission reaction of CH3O2H, CH3CO3H, and C2H5O2H, (3) O-O bond scission reaction of H2O2, and (4) H+O2=O+OH are key chain branching reactions to explain the multi-stage oxidation. [ABSTRACT FROM AUTHOR]

The application of rapeseed oil (RO) blends with diesel fuel and/or alcohols and/or ethers is known to significantly affect the combustion process. Aiming to further investigate the effects of rapeseed oil in a blend with diethyl ether (DEE) on this process, the coefficient of variation of the mean indicated pressure (COVMIP) of a 2.5l direct injection diesel engine was calculated. The analysis of the experimental results revealed the repeatability of the combustion process variability of diesel fuel (DF), rapeseed oil (RO), and DEE/RO blends containing up to 20% DEE. In these cases, the COVMIP does not exceed 4%. Additionally, it became obvious that for a higher content of DEE in blend with RO, the cyclic repeatability of the mean indicated pressure (MIP) was reduced. Thus, the values of COVMIP for fuels containing 30 and 40% of DEE by vol. in blend with RO were even three times higher than the values obtained for the reference fuel i.e., DF. The results indicate that the increased content of DEE in the mixture with RO is disadvantageous as it leads to excessive unevenness of the engine operation compared to its fueling with DF. The observed deterioration of the combustion process is caused by the vapor locks, which are formed due to the evaporation of volatile DEE in the fuel line, leading to the interrupted operation of the fuel injector. [ABSTRACT FROM AUTHOR]

The conversion of ethanol towards ethylene and diethyl ether in the presence of catalysts requires special consideration from the perspective of green chemistry. Ethanol dehydration was studied on a complex titanium phosphate MAlTiP (M0.5(1+x)AlxTi2-x(PO4)3 with M = Ni, Mn (x = 0; 0.2)) catalysts, alongside a NASICON-type structure synthesized by the sol–gel method. The initial catalysts were characterized by N2 gas sorption, SEM, XRD and spectroscopic methods (Raman and DRIFT of adsorbed CO and C6H6). The results revealed that all catalysts exhibited high activity and selectivity at 300–420 °C. The conversion of ethanol increases with the reaction temperature, reaching 67–80% at 420 °C. The MnAlTiP exhibited the highest ethylene selectivity among other catalysts, with 87% at 420 °C. The aluminum modification improved the acid properties of the catalysts, due to the appearance of Lewis acid sites (LAS) and the strength moderate Brønsted acid sites (BAS). It was shown that the activity of complex phosphates in ethanol dehydration increases with the strength of the Brønsted acid sites (BAS). [ABSTRACT FROM AUTHOR]

Cool flames of diethyl ether were stabilized and extensively studied in a stagnation plate burner. Two conditions were selected, enabling the assessment of the impact of ozone-seeding on the cool flame: In the first case, ozone was seeded to stabilize a lean cool flame with an equivalence ratio of 0.5, and in a second case a stoichiometric flame was stabilized without O 3 addition. Excited formaldehyde chemiluminescence (CH 2 O*) was used to measure the cool flame position in the burner. Detailed temperature and mole fraction profiles of stable intermediates of the oxidation of diethyl ether were measured for both conditions. Relevant detailed kinetic models issued from the literature, respectively developed by Tran et al. [Tran et al., Proc. Comb. Inst. 2019, 37, 511–519] and Serinyel et al. [Serinyel et al., Combust. Flame 2018, 193, 453–462] were used in order to improve the understanding of the low temperature kinetics of this ether, as well as the effect of ozone on the species distribution after the cool flame. The Tran et al. model is able to correctly predict the cool flame position as well as its heat release in the lean case, but shows high discrepancy in the prediction of products formation, while the Serinyel et al. model shows a fair prediction of the cool flame products distribution. A numerical comparison between a stoichiometric flame, with and without ozone-seeding, was also performed in order to gain some insight into the ozone influence on the low temperature products distribution. Main results show that the R O ˙ radical decomposition is of particular importance in our conditions, which formation is directly linked to R O ˙ 2 bimolecular reactions, reinforcing the link between atmospheric chemistry and low temperature combustion. [ABSTRACT FROM AUTHOR]

Towards environmental sustainability, plant-based biofuels are utilized in diesel engines as an alternative to depleting fossil fuels for improved performance and emission reduction. In this research, experimental investigation of compression ignition (CI) diesel engine performance is done with two different fuels; neat diesel and 10% cashew nut shell liquid (CSNL) blended diesel (B10) with varying proportions of Diethyl ether (DEE) additive (5, 10 and 15%) running at different injection pressure (190, 210 and 230 kgf/cm2). The engine is operated at rated speed and load condition for evaluation. The split-plot design of Response Surface Methodology (RSM) is considered for designing the experiment and analysis. Total fuel consumption (TFC) and mechanical efficiency (ME) are optimised based on the desirability approach. The optimum condition of 15% DEE addition and 190 kgf/cm2 injection pressure produces a lower TFC of 0.845 kg/hr and a higher ME of 68.096% for diesel. Similarly, the optimised injection pressure of 230 kg/cm2 and 5% DEE addition also produces a lower TFC of 0.9145 kg/hr and a higher ME of 71.007% for B10 fuel. Observation shows that the increase in injection pressure and DEE addition significantly improves the ME of B10 blend and slightly increases fuel consumption. Higher ME is obtained for B10 due to the higher calorific value of CSNL. [ABSTRACT FROM AUTHOR]

The main disadvantages of HCCI engines are the knocking tendency at high engine loads, the challenge of the start of the combustion, control of the combustion phase, and the narrow operating range. In this study, we aimed to control the combustion processes in HCCI engines and to expand their working range by improving the fuel properties of fusel oil by the addition of diethyl ether. Thus, the variations in the in-cylinder pressure, rate of heat release, indicated mean effective pressure, start of combustion, combustion duration, CA50, indicated thermal efficiency, mean pressure rise rate, hydrocarbon and carbon monoxide emissions were investigated. It was observed that the in-cylinder pressure and rate of heat release were taken into advance and the test engine could be operated for a wider range by increasing the diethyl ether ratio in the blend. The indicated mean effective pressure increased by 67.5% with DEE40 fuel compared to the DEE80. Under the same operating conditions, HC and CO emissions decreased by 41.6% and 56.2%, in use of DEE40. Furthermore, the highest indicated thermal efficiency was obtained as 42.5% with DEE60 fuel. Maximum hydrocarbon and carbon monoxide emissions were observed with DEE80 fuel as 0.532% and 549 ppm, respectively. [ABSTRACT FROM AUTHOR]

• Premixing DEE helped engine start quickly at −40 °C temperature and 4000 m altitude. • The diesel engine using intake heater failed to start at −40 °C and high altitudes. • Premixed DEE reduces ignition delay of diesel at low temperatures and high altitudes. • Premixed DEE enhanced the evaporation of diesel and reduced fuel film thickness. • Diesel engine with DEE premixed emitted lower HC and CO during cold start. The cold-start performance poses a primary challenge influencing the reliability of diesel engines operating in plateau and low-temperature regions. An experimental investigation was conducted to assess the cold-start performance of diesel engines with premixing diethyl ether (DEE), spanning altitudes from sea level to 4000 m and ambient temperatures of −20 °C and −40 °C. The diesel engine with premixing DEE exhibited successful cold starts at all these test conditions. In comparison, the diesel engine employing intake heating failed to reach idle speed in −40 °C high-altitude conditions. The premixed DEE could generate radicals, accompanied by a minor heat release preceding the injection of diesel, facilitating ignition. Furthermore, the premixed DEE enhanced fuel evaporation and facilitated the formation of combustible mixtures with higher equivalence ratios at low temperatures. Moreover, the fuel film resulting from wall impingement with premixing DEE was thinner than that with intake heating, contributing to decreased incomplete combustion losses. Energy analysis results revealed that the diesel engine employing premixing DEE demonstrated higher indicated thermal efficiency. The cold start assistance by premixing DEE proved to be much more effective, and the test engine could start smoothly under extremely low temperatures of −40 °C and high altitudes up to 4000 m. [ABSTRACT FROM AUTHOR]

In this study, ten different blends were prepared with binary and ternary combinations of diesel, palm oil biodiesel (0 vol%, 15 vol%, 20 vol% and 30 vol%), and diethyl ether (0 vol%, 5 vol% and 10 vol%) and were tested in a diesel engine. The experiments were performed on various engine loads (500 W, 750 W, 1000 W and 1250 W) and various injection timings (25° CA bTDC, 30° CA bTDC and 35° CA bTDC) at a fixed crankshaft speed of 3000 rpm. The prepared blends were compared in terms of exergy and exergoeconomics. It may be said that exergy efficiency and specific exergy cost of work for blends improved with increasing injection timings at high engine loads. However, at low engine loads, these parameters worsened with increasing injection timings. As a result, at 500 W, relative exergy efficiency of D70PO20DE10 was 0.57 for 25° CA bTDC and 0.54 for 35° CA bTDC. However, at 1250 W, this value was 0.59 for 25° CA bTDC and 1.16 for 35° CA bTDC. Similarly, at 500 W, relative specific exergy cost of work for D70PO20DE10 was 5.29 for 25° CA bTDC and 5.94 for 35° CA bTDC. However, at 1250 W, this value was 5.31 for 25° CA bTDC and 2.66 for 35° CA bTDC. Finally, it can be concluded that neat diesel had the best results compared to all blends considered in this study in terms of exergy and exergoeconomics. [ABSTRACT FROM AUTHOR]

General volatile anesthetic diethyl ether blocks sensation and responsive behavior not only in animals but also in plants. Here, using a combination of RNA-seq and proteomic LC-MS/MS analyses, we investigated the effect of anesthetic diethyl ether on gene expression and downstream consequences in plant Arabidopsis thaliana. Differential expression analyses revealed reprogramming of gene expression under anesthesia: 6,168 genes were upregulated, 6,310 genes were downregulated, while 9,914 genes were not affected in comparison with control plants. On the protein level, out of 5,150 proteins identified, 393 were significantly upregulated and 227 were significantly downregulated. Among the highest significantly downregulated processes in etherized plants were chlorophyll/tetrapyrrole biosynthesis and photosynthesis. However, measurements of chlorophyll a fluorescence did not show inhibition of electron transport through photosystem II. The most significantly upregulated process was the response to heat stress (mainly heat shock proteins, HSPs). Using transgenic A. thaliana expressing APOAEQUORIN, we showed transient increase of cytoplasmic calcium level [Ca2+]cyt in response to diethyl ether application. In addition, cell membrane permeability for ions also increased under anesthesia. The plants pre-treated with diethyl ether, and thus with induced HSPs, had increased tolerance of photosystem II to subsequent heat stress through the process known as cross-tolerance or priming. All these data indicate that diethyl ether anesthesia may partially mimic heat stress in plants through the effect on plasma membrane. [ABSTRACT FROM AUTHOR]

Plants can sense and respond to non-damaging mechanical stimulation such as touch, rain, or wind. Mechanical stimulation induces an increase of cytosolic calcium ([Ca 2+ ] cyt ), accumulation of phytohormones from the group of jasmonates (JAs) and activation of gene expression, which can be JAs-dependent or JAs-independent. Response to touch shares similar properties with reactions to stresses such as wounding or pathogen attack, and regular mechanical stimulation leads to changes in growth and development called thigmomorphogenesis. Previous studies showed that well-known seismonastic plants such as Venus flytrap (Dionaea muscipula) or sensitive plant (Mimosa pudica) lost their touch-induced motive responses during exposure to general volatile anaesthetic (GVA) diethyl ether. Here, we investigated the effect of diethyl ether anaesthesia on touch response in Arabidopsis thaliana. We monitored [Ca 2+ ] cyt level, accumulation of JAs and expression of touch-responsive genes. Our results showed that none of the investigated responses was affected by diethyl ether. However, diethyl ether alone increased [Ca 2+ ] cyt and modulated JAs-independent touch-responsive genes, thus partially activating touch response non-specifically. Together with our previous studies, we concluded that GVA diethyl ether cannot block the local rise of [Ca 2+ ] cyt but only its systemic propagation dependent on GLUTAMATE LIKE RECEPTOR 3s (GLR3s) channels., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier GmbH. All rights reserved.)