21 results on '"Yaohui Cheng"'
Search Results
2. Strength and Microscopic Mechanism of Cement–Fly Ash–Slag–Desulfurization Gypsum Solidified Mica Schist Weathered Soil
- Author
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Yunzhi Shang, Zhenglong Cui, Yongjing Li, Yannian Zhang, and Yaohui Cheng
- Subjects
mica schist weathered soil ,solid waste ,strength ,microscopic characteristics ,Technology ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Microscopy ,QH201-278.5 ,Descriptive and experimental mechanics ,QC120-168.85 - Abstract
Mica schist weathered soil possesses a number of poor engineering characteristics, which make it difficult to use as a subgrade material for resource utilization. Therefore, in this study, a new type of curing agent, CFSD (cement–fly ash–slag–desulfurized gypsum), is proposed for this soil. The effects of different curing agent dosages, age of preservation, and confining pressure on the stress–strain curves were analyzed via the uniaxial compression test and triaxial compression test, while the micromorphological characteristics of cured soil were analyzed via X-ray diffraction analysis and the SEM test combined with Image J software. In this paper, we also establish a microscopic mechanism model to determine how curing agents increase the strength of mica schists. The results reveal that the compressive strength of solidified soil increases rapidly within 28 days; the CFSD dosage of 4% at 7 d increased by 103.23% by 28 d. After 28 d, the trend of compressive strength growth was flat. The CFSD dosage of 4% at 7 d increased by 128.34% by 90 d; with the increase in the dosage, the curve transformed from flat to steep. These results suggest that the CFSD dosage is positively correlated with the damage strain and damage bias stress of solidified soil. The curves for the strain softening type with a 4% dosage as the initial effective confining pressure increased from 50 kPa to 300 kPa; the failure stress and failure strain increased by 202.09% and 90.85%, respectively. With the increase in curing agent dosage and maintenance age, the pore size of 2~5 μm, >5 μm interval decreased from 56.46% to 27.92%, the porosity decreased from 12.51% to 4.6%, and the hydrate produced by the curing agent cemented and filled up the pore space between the loose particles of the soil body. Thus, the large pore space became microporous, and the pore structure densification was greatly improved.
- Published
- 2023
- Full Text
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3. Damage Model of Steel Fiber-Reinforced Coal Gangue Concrete under Freeze–Thaw Cycles Based on Weibull Distribution
- Author
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Yaohui Cheng, Li Sun, Yongjing Li, Mengxin Liu, Ruixia He, Xiaoying Jin, and Huijun Jin
- Subjects
steel fiber-reinforced coal gangue concrete (SCGC) ,freeze–thaw cycle (FTC) ,flexural properties ,microscopic analysis ,damage evolution model ,Technology ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Microscopy ,QH201-278.5 ,Descriptive and experimental mechanics ,QC120-168.85 - Abstract
In order to improve the utilization rate of coal gangue and expand the application range of coal gangue concrete (CGC), a certain proportion of steel fiber was added to the concrete, and the freeze–thaw cycles (FTCs) and flexural tests were used to explore the effects of different mass replacement rates of coal gangue (0%, 25%, 50%, 75%, and 100%) and different proportions of the volumetric blending of the steel fiber (0%, 0.8%, 1.0%, and 1.2%) on the frost resistance of steel fiber-reinforced CGC (SCGC). The governing laws of mass loss rate, relative dynamic elastic modulus and load–midspan deflection curve were obtained on the base of the analysis of testing results. The damage mechanisms of the SCGC under the FTCs were analyzed using the results of scanning electron microscopy (SEM). Based on the Lemaitre’s strain equivalence principle and Krajcinovic’s vector damage theory, a damage evolution model of the SCGC under the FTCs was established by introducing the damage variable of the SCGC satisfying Weibull distribution. The results show an increasing mass loss rate of the SCGC and a decreasing relative dynamic elastic modulus with an increasing mass replacement rate of coal gangue. The proper content of the steel fiber can reduce the mass loss rate of concrete by 10~40% and the relative loss rate of dynamic elastic modulus of concrete by 2~8%, thus significantly improving the ductility and toughness of the concrete. The established damage evolution model is well validated by the experimental results, which further help to improve the modelling accuracy. This study provides key experimental data and a theoretical basis for a wider range of proper utilization of coal gangue in cold regions.
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- 2023
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4. Cellulose-Based Ultralong Room-Temperature Phosphorescence Nanomaterials with Tunable Color and High Quantum Yield via Nano-Surface Confining Effect
- Author
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Xin Zhang, Chunchun Yin, Jingxuan You, Ruiqiao Li, Jinming Zhang, Yaohui Cheng, Yirong Wang, and Jun Zhang
- Subjects
Science - Abstract
How to achieve multicolor organic room-temperature phosphorescence (RTP) is still challenging and striking. Herein, we discovered a new principle to construct eco-friendly color-tunable RTP nanomaterials based on the nano-surface confining effect. Cellulose nanocrystal (CNC) immobilized cellulose derivatives (CX) containing aromatic substituents via hydrogen-bonding interactions, which effectively inhibit the motion of cellulose chains and luminescent groups to suppress the nonradiative transitions. Meanwhile, CNC with a strong hydrogen-bonding network can isolate oxygen. CX with different aromatic substituents regulate the phosphorescent emission. After mixing CNC and CX directly, a series of polychromatic ultralong RTP nanomaterials were obtained. The RTP emission of the resultant CX@CNC can be finely adjusted through the introduction of various CX and the regulation of the CX/CNC ratio. Such a universal, facile, and effective strategy can be used to fabricate various colorful RTP materials with wide color gamut. Because of the complete biodegradability of cellulose, the multicolor phosphorescent CX@CNC nanomaterials can be used as eco-friendly security inks to fabricate disposable anticounterfeiting labels and information-storage patterns via conventional printing and writing processes.
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- 2023
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5. Ultralong phosphorescence cellulose with excellent anti-bacterial, water-resistant and ease-to-process performance
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Xin Zhang, Yaohui Cheng, Jingxuan You, Jinming Zhang, Chunchun Yin, and Jun Zhang
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Science - Abstract
Organic room-temperature phosphorescence (RTP) materials often suffer from poor processability because of their crystalline or cross-linked nature. Here, the authors demonstrate phosphorescence in a processable cellulose derivative by introducing cationic groups such as imidazolium cations which are able to promote intersystem crossing and to form hydrogen bonds, inhibiting non-radiative transitions.
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- 2022
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6. The study of laccase immobilization optimization and stability improvement on CTAB-KOH modified biochar
- Author
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Zhaobo Wang, Dajun Ren, Shan Jiang, Hongyan Yu, Yaohui Cheng, Shuqin Zhang, Xiaoqing Zhang, and Wangsheng Chen
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Laccase ,Modified biochar ,Immobilization optimization ,Stability improvement ,Biotechnology ,TP248.13-248.65 - Abstract
Abstract Background Although laccase has a good catalytic oxidation ability, free laccase shows a poor stability. Enzyme immobilization is a common method to improve enzyme stability and endow the enzyme with reusability. Adsorption is the simplest and common method. Modified biochar has attracted great attention due to its excellent performance. Results In this paper, cetyltrimethylammonium bromide (CTAB)-KOH modified biochar (CKMB) was used to immobilize laccase by adsorption method (laccase@CKMB). Based on the results of the single-factor experiments, the optimal loading conditions of laccase@CKMB were studied with the assistance of Design-Expert 12 and response surface methods. The predicted optimal experimental conditions were laccase dosage 1.78 mg/mL, pH 3.1 and 312 K. Under these conditions, the activity recovery of laccase@CKMB was the highest, reaching 61.78%. Then, the CKMB and laccase@CKMB were characterized by TGA, FT-IR, XRD, BET and SEM, and the results showed that laccase could be well immobilized on CKMB, the maximum enzyme loading could reach 57.5 mg/g. Compared to free laccase, the storage and pH stability of laccase@CKMB was improved greatly. The laccase@CKMB retained about 40% of relative activity (4 °C, 30 days) and more than 50% of relative activity at pH 2.0–6.0. In addition, the laccase@CKMB indicated the reusability up to 6 reaction cycles while retaining 45.1% of relative activity. Moreover, the thermal deactivation kinetic studies of laccase@CKMB showed a lower k value (0.00275 min− 1) and higher t1/2 values (252.0 min) than the k value (0.00573 min− 1) and t1/2 values (121.0 min) of free laccase. Conclusions We explored scientific and reasonable immobilization conditions of laccase@CKMB, and the laccase@CKMB possessed relatively better stabilities, which gave the immobilization of laccase on this cheap and easily available carrier material the possibility of industrial applications.
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- 2021
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7. Immobilization of laccase on chitosan functionalized halloysite nanotubes for degradation of Bisphenol A in aqueous solution: degradation mechanism and mineralization pathway
- Author
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Zhaobo Wang, Dajun Ren, Yaohui Cheng, Xiaoqing Zhang, Shuqin Zhang, and Wangsheng Chen
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EDCs ,BPA ,Laccase ,Chitosan ,Halloysite nanotubes ,Science (General) ,Q1-390 ,Social sciences (General) ,H1-99 - Abstract
As a hazardous organic chemical raw material, Bisphenol A (BPA) has attracted a great deal of scientific and public attention. In this study, the chitosan functionalized halloysite nanotubes immobilized laccase (lac@CS-HNTs) was prepared by simultaneous adsorption-covalent binding method to remove BPA for the first time. We optimized the preparation of lac@CS-NHTs by controlling one-factor variable method and response surface methodology (RSM). The cubic polynomial regression model via Design-Expert 12 was developed to describe the optimal preparation conditions of immobilized laccase. Under the optimal conditions, lac@CS-NHTs obtained the maximum enzyme activity, and the enzyme loading was as high as 60.10 mg/g. The results of batch removal experiment of BPA showed that under the optimum treatment condition, the BPA removal rate of lac@CS-NHTs, FL and heat-inactivated lac@CS-NHTs was 87.31 %, 60.89 % and 24.54 %, respectively, which indicated that the contribution of biodegradation was greater than adsorption. In addition, the relative activity of lac@CS-NHTs dropped to about 44.24 % after 8 cycles of BPA removal, which demonstrated that lac@CS-NHTs have the potential to reduce costs in practical applications. Finally, the possible degradation mechanism and mineralization pathway of BPA were given via High-performance liquid chromatography (HPLC) analysis and gas chromatography-mass spectrometry (GC-MS) analysis.
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- 2022
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8. Click Modification for Polysaccharides via Novel Tunnel Transmission Phenomenon in Ionic Liquids
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Yan Zhou, Jinming Zhang, Yaohui Cheng, Xin Zhang, Jin Wu, and Jun Zhang
- Subjects
Science - Abstract
It is extremely difficult to achieve a rapid and efficient modification of natural polysaccharides, due to the intrinsic strong hydrogen bonding networks and the slow mass transfer process during the reaction process. Herein, we found a fascinating anion-tunnel transmission phenomenon in the imidazolium-based ionic liquids with carboxylate anions. A novel click esterification of natural polysaccharides thus was demonstrated under a catalyst-free condition within a very short reaction time of 15 min at 0-80°C. Such a super-rapid and highly efficient modification strategy is available for various polysaccharides (cellulose, starch, inulin, pullulan, dextran, and xylan), different esterification reactions (acetification, propionation, benzoylation, and cyclohexyl formylation), and high concentrations, claiming a revolutionary potential in polysaccharide chemistry industries.
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- 2022
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9. Molecular weight characterization of cellulose using ionic liquids
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Yan Zhou, Xiaocheng Zhang, Jinming Zhang, Yaohui Cheng, Jin Wu, Jian Yu, and Jun Zhang
- Subjects
Cellulose ,Molecular weight ,Molecular weight distribution ,Ionic liquids ,Intrinsic viscosity ,Gel permeation chromatography ,Polymers and polymer manufacture ,TP1080-1185 - Abstract
Cellulose, the most abundant natural polymer on the planet, is the major polysaccharide produced by plant photosynthesis. It has many advantages, such as renewability, tremendous reversibility, complete biodegradability, excellent biocompatibility, high mechanical property and structural designability. The molecular weight and polydispersity index are the key parameters of cellulose materials. Measurement of the molecular weight characteristics of cellulose is of great significance for effectively utilizing cellulose resources and comprehensively understanding the relationship between structure and property. In this review, we summarize the methods used to characterize the molecular weight of cellulose and focus on the detailed applications of ionic liquids for such characterization.
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- 2021
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10. Spontaneous, scalable, and self-similar superhydrophobic coatings for all-weather deicing
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Yaohui Cheng, Yirong Wang, Xin Zhang, Jinming Zhang, Zhiyuan He, Jianjun Wang, and Jun Zhang
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General Materials Science ,Electrical and Electronic Engineering ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics - Published
- 2023
11. Confronting the Challenge of Cellulose Molecular Weight Measurement: An Accurate, Rapid, and Universal Method with Ionic Liquid as an Additive
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Yan Zhou, Yaohui Cheng, Qinyong Mi, Xiaocheng Zhang, Jinming Zhang, and Jun Zhang
- Subjects
Molecular Weight ,Viscosity ,Ionic Liquids ,Cellulose ,Analytical Chemistry - Abstract
Molecular weight parameters are the key fundamental information of polymer materials, but the accurate characterization of the molecular weight of cellulose is extremely difficult due to its strong hydrogen bonding network. Herein, we demonstrated two new methods to accurately and rapidly measure the molecular weight parameters of cellulose by using 1-butyl-3-methylimidazolium acetate (BmimAc) ionic liquid (IL) as an additive. Cellulose is rapidly dissolved in BmimAc/DMSO (1:1, w/w) at room temperature at first. Then, DMAc is added to dilute the solution, and finally, the molecular weight and molecular weight distribution of cellulose samples are measured by the gel permeation chromatography (GPC) method with BmimAc/DMSO/DMAc (1:1:18, w/w) as the mobile phase. Such a simple method is suitable to all kinds of cellulose samples and exhibits an extremely high analytical efficiency which is 50 times higher than the previous GPC methods. In addition, a viscosity method that is available for industrial application was proposed by using the BmimAc/DMSO/DMAc (1:1:8, w/w) system with low viscosity. The relationship between the intrinsic viscosity of the cellulose/BmimAc/DMSO/DMAc solution and the molecular weight of cellulose is well established and is applicable to cellulose samples of
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- 2022
12. Adsorption Kinetic and Isothermal Studies of 2,4-Dichlorophenol from Aqueous Solutions with Zeolitic Imidazolate Framework-8 (ZIF-8)
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Zhaobo Wang, Xiaoqing Zhang, Shuqin Zhang, Shan Jiang, Yaohui Cheng, Hongyan Yu, and Dajun Ren
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Aqueous solution ,Chemistry ,Kinetics ,2,4-Dichlorophenol ,02 engineering and technology ,010501 environmental sciences ,021001 nanoscience & nanotechnology ,01 natural sciences ,Pollution ,Isothermal process ,chemistry.chemical_compound ,Adsorption ,Chemical engineering ,Adsorption kinetics ,Environmental Chemistry ,Ecotoxicity ,0210 nano-technology ,Waste Management and Disposal ,0105 earth and related environmental sciences ,Zeolitic imidazolate framework - Abstract
It has been observed that 2,4-dichlorophenol (2,4-DCP) possesses great environmental concern for its high ecotoxicity and ubiquitousness. Adsorption is one of the simplest methods to remove the 2,4...
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- 2021
13. Irreversible Humidity-Responsive Phosphorescence Materials from Cellulose for Advanced Anti-Counterfeiting and Environmental Monitoring
- Author
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Xin Zhang, Yaohui Cheng, Jingxuan You, Jinming Zhang, Yirong Wang, and Jun Zhang
- Subjects
General Materials Science - Abstract
Organic phosphorescence materials have many unique advantages, such as a large Stokes shift, high signal-to-noise ratio, and no interference from background fluorescence and scattered light. But, they generally lack responsiveness. Herein, we developed a new type of biopolymer-based phosphorescence materials with excellent processability and irreversible humidity-responsiveness, via introducing the imidazolium cation to cellulose chain. In the resultant cellulose derivatives, the imidazolium cation promotes the intersystem crossing, meanwhile the cation, chloride anion, and hydroxyl group form multiple hydrogen bonding interactions and electrostatic attraction interactions, which successfully inhibit the nonradiative transitions. As a result, the ionic cellulose derivatives exhibit green phosphorescence at room temperature and can be processed into phosphorescent films, coatings, and patterns. More interestingly, their phosphorescence emission changes when the different processing solvents are used. The ionic cellulose derivatives processed with acetone have a negligible phosphorescence, while they give an irreversible humidity-responsive phosphorescence, which means that the ionic cellulose derivatives processed with acetone exhibit significantly enhanced phosphorescence once they meet water vapor. Such novel irreversible responsive phosphorescence materials have huge potential in advanced anticounterfeiting, information encryption, molecular logic gates, smart tags, and process monitoring.
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- 2022
14. Study on adsorption-degradation of 2,4-dichlorophenol by modified biochar immobilized laccase
- Author
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Shuqin Zhang, Dajun Ren, Zhaobo Wang, Yaohui Cheng, Jun Wu, Shan Jiang, Hongyan Yu, and Xiaoqing Zhang
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Laccase ,Environmental Engineering ,Chemistry ,2,4-Dichlorophenol ,Langmuir adsorption model ,010501 environmental sciences ,Biodegradation ,01 natural sciences ,chemistry.chemical_compound ,symbols.namesake ,Adsorption ,Bromide ,Biochar ,symbols ,Environmental Chemistry ,Degradation (geology) ,General Agricultural and Biological Sciences ,0105 earth and related environmental sciences ,Nuclear chemistry - Abstract
In this paper, biochar was modified by cetyltrimethylammonium bromide (CTAB) and KOH solution, and it was characterized by TGA, FT-IR, XRD, BET, SEM. Then, the modified biochar (MB) was used to immobilize free laccase (FL) by adsorption method to prepare modified biochar immobilize laccase (MBL). The adsorption and degradation performance for 2,4-DCP via MB, FL, MBL were studied. The results showed that under the optimal conditions, the adsorption rate of MB on 2,4-DCP was up to 42.5%, adsorption capacity was 85.13 mg/g, and the adsorption of 2,4-DCP by MB was proved to conform to the pseudo-second-order model and the Langmuir adsorption isotherm model; the maximum degradation rate of FL on 2,4-DCP was 97.7%, and the degradation of 2,4-DCP by FL was proved to conform to the first-order kinetic model; under the optimal conditions, the removal rate of MBL on 2,4-DCP can reach almost 100%. MBL combines physical–chemical adsorption and biodegradation, and the contribution of biodegradation is greater than adsorption. Finally, the possible degradation mechanism and pathways of 2,4-DCP were given via high-performance liquid chromatography (HPLC) analysis and gas chromatography-mass spectrometry (GC–MS) analysis.
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- 2021
15. Ultralong phosphorescence cellulose with excellent anti-bacterial, water-resistant and ease-to-process performance
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Xin Zhang, Yaohui Cheng, Jingxuan You, Jinming Zhang, Chunchun Yin, and Jun Zhang
- Subjects
Anions ,Multidisciplinary ,Bacteria ,Chlorides ,Cations ,General Physics and Astronomy ,Water ,General Chemistry ,Cellulose ,General Biochemistry, Genetics and Molecular Biology ,Anti-Bacterial Agents - Abstract
Herein, we present a phosphorescent cationized cellulose derivative by simply introducing ionic structures, including cyanomethylimidazolium cations and chloride anions, into cellulose chains. The imidazolium cations with the cyano group and nitrogen element promote intersystem crossing. The cyano-containing cations, chloride anions and hydroxyl groups of cellulose form multiple hydrogen bonding interactions and electrostatic attraction interactions, effectively inhibiting the non-radiative transitions. The resultant cellulose-based RTP material is easily processed into phosphorescent films, fibers, coatings and patterns by using eco-friendly aqueous solution processing strategies. Furthermore, after we construct a cross-linking structure by adding a small amount of glutaraldehyde as the cross-linking agent, the as-fabricated phosphorescent patterns exhibit excellent antibacterial properties and water resistance. Therefore, considering the outstanding biodegradability and sustainability of cellulose materials, cellulose-based easy-to-process RTP materials can act as antibacterial, water-resistant, and eco-friendly phosphorescent patterns, coatings and bulk materials, which have enormous potential in advanced anti-counterfeiting, information encryption, disposable smart labels, etc.
- Published
- 2021
16. Hygroscopic hydrophobic coatings from cellulose: Manipulation of the aggregation morphology of water
- Author
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Yaohui Cheng, Xin Zhang, Jinming Zhang, Zhiyuan He, Yirong Wang, Jianjun Wang, and Jun Zhang
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General Chemical Engineering ,Environmental Chemistry ,General Chemistry ,Industrial and Manufacturing Engineering - Published
- 2022
17. The Study of Laccase Immobilization Optimization and Stability Improvement on CTAB-KOH Modified Biochar
- Author
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Xiaoqing Zhang, Wangsheng Chen, Shan Jiang, Hongyan Yu, Shuqin Zhang, Dajun Ren, Yaohui Cheng, and Zhaobo Wang
- Subjects
Immobilized enzyme ,Potassium Compounds ,Biology ,Immobilization optimization ,Fungal Proteins ,Polyporaceae ,chemistry.chemical_compound ,Adsorption ,Bromide ,Biochar ,Enzyme Stability ,Hydroxides ,Stability improvement ,Laccase ,Carrier material ,Cetrimonium ,Research ,Temperature ,Hydrogen-Ion Concentration ,Ph stability ,Enzymes, Immobilized ,Kinetics ,Catalytic oxidation ,chemistry ,Modified biochar ,Charcoal ,TP248.13-248.65 ,Biotechnology ,Nuclear chemistry - Abstract
Background Although laccase has a good catalytic oxidation ability, free laccase shows a poor stability. Enzyme immobilization is a common method to improve enzyme stability and endow the enzyme with reusability. Adsorption is the simplest and common method. Modified biochar has attracted great attention due to its excellent performance. Results In this paper, cetyltrimethylammonium bromide (CTAB)-KOH modified biochar (CKMB) was used to immobilize laccase by adsorption method (laccase@CKMB). Based on the results of the single-factor experiments, the optimal loading conditions of laccase@CKMB were studied with the assistance of Design-Expert 12 and response surface methods. The predicted optimal experimental conditions were laccase dosage 1.78 mg/mL, pH 3.1 and 312 K. Under these conditions, the activity recovery of laccase@CKMB was the highest, reaching 61.78%. Then, the CKMB and laccase@CKMB were characterized by TGA, FT-IR, XRD, BET and SEM, and the results showed that laccase could be well immobilized on CKMB, the maximum enzyme loading could reach 57.5 mg/g. Compared to free laccase, the storage and pH stability of laccase@CKMB was improved greatly. The laccase@CKMB retained about 40% of relative activity (4 °C, 30 days) and more than 50% of relative activity at pH 2.0–6.0. In addition, the laccase@CKMB indicated the reusability up to 6 reaction cycles while retaining 45.1% of relative activity. Moreover, the thermal deactivation kinetic studies of laccase@CKMB showed a lower k value (0.00275 min− 1) and higher t1/2 values (252.0 min) than the k value (0.00573 min− 1) and t1/2 values (121.0 min) of free laccase. Conclusions We explored scientific and reasonable immobilization conditions of laccase@CKMB, and the laccase@CKMB possessed relatively better stabilities, which gave the immobilization of laccase on this cheap and easily available carrier material the possibility of industrial applications.
- Published
- 2021
18. Molecular weight characterization of cellulose using ionic liquids
- Author
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Jian Yu, Jin Wu, Yaohui Cheng, Zhang Xiaocheng, Yan Zhou, Jun Zhang, and Jinming Zhang
- Subjects
Materials science ,Polymers and Plastics ,Biocompatibility ,Dispersity ,Intrinsic viscosity ,02 engineering and technology ,010402 general chemistry ,Polysaccharide ,01 natural sciences ,Molecular weight ,Molecular weight distribution ,chemistry.chemical_compound ,Polymers and polymer manufacture ,Cellulose ,chemistry.chemical_classification ,Organic Chemistry ,Polymer ,Biodegradation ,Gel permeation chromatography ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Characterization (materials science) ,Ionic liquids ,TP1080-1185 ,chemistry ,Chemical engineering ,Ionic liquid ,0210 nano-technology - Abstract
Cellulose, the most abundant natural polymer on the planet, is the major polysaccharide produced by plant photosynthesis. It has many advantages, such as renewability, tremendous reversibility, complete biodegradability, excellent biocompatibility, high mechanical property and structural designability. The molecular weight and polydispersity index are the key parameters of cellulose materials. Measurement of the molecular weight characteristics of cellulose is of great significance for effectively utilizing cellulose resources and comprehensively understanding the relationship between structure and property. In this review, we summarize the methods used to characterize the molecular weight of cellulose and focus on the detailed applications of ionic liquids for such characterization.
- Published
- 2021
19. Immobilization of Ionic Liquids with a New Cellulose Ester Containing Imidazolium Cation for High-Performance CO
- Author
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Yaohui, Cheng, Xin, Zhang, Chunchun, Yin, Jinming, Zhang, Jian, Yu, and Jun, Zhang
- Subjects
Cations ,Ionic Liquids ,Esters ,Carbon Dioxide ,Cellulose - Abstract
CO
- Published
- 2020
20. Immobilization of Ionic Liquids with a New Cellulose Ester Containing Imidazolium Cation for High‐Performance CO 2 Separation Membranes
- Author
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Jinming Zhang, Jian Yu, Jun Zhang, Chunchun Yin, Yaohui Cheng, and Xin Zhang
- Subjects
chemistry.chemical_classification ,Sulfonyl ,Polymers and Plastics ,Organic Chemistry ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Cellulose acetate ,0104 chemical sciences ,chemistry.chemical_compound ,Membrane ,chemistry ,Chemical engineering ,Ionic liquid ,Materials Chemistry ,Gas separation ,Cellulose ,0210 nano-technology ,Imide ,Alkyl - Abstract
CO2 gas separation is of significant importance to protect the environment and utilize the carbon resource. In this work, two kinds of new cellulose esters containing imidazolium cation, cellulose acetate (CA) 1-butyl-3-methylimidazolium chloride and CA 1-butyl-3-methylimidazolium bis(trifluoromethane sulfonyl)imide (CA-BmimTf2 N), are designed and synthesized. The resultant cationized cellulose esters effectively lock various ionic liquids (ILs) via electrostatic interactions. Due to the strong attraction interactions, the obtained cellulose ester/ILs composite membranes are uniform, smooth, and highly transparent. Moreover, the added ILs with a long alkyl chain in the cation and a bis(trifluoromethane sulfonyl)imide anion remarkably improve the CO2 permeability of the cellulose ester/ILs membranes, because of the dramatic increase of the CO2 diffusion rate. The CA-BmimTf2 N/C10 mimTf2 N membranes exhibit the highest CO2 permeability, which is 3800% higher than that of CA membrane and 1700% higher than that of CA-BmimTf2 N membrane. More importantly, the CA-BmimTf2 N/C10 mimTf2 N membranes have good mechanical properties and thermal stability. Such high-performance CO2 separation membranes with high CO2 permeability, high transparency, and good mechanical property have a huge potential in the practical utilization for gas separation.
- Published
- 2020
21. Intelligent Control for Aerodynamics Research Test
- Author
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Janming, Jia, primary, Yaohui, Cheng, additional, and Huiming, Liu, additional
- Published
- 2008
- Full Text
- View/download PDF
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