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Development zones constitute a special type of place‐based policy that has been implemented worldwide. As an essential economic development engine, Chinese National Economic and Technological Development Zones (NETDZs) are perceived as a successful example. However, few studies have looked into the channel effects at work in development zones concerning industrialization and urbanization, despite the crucial nature of such effects with regard to sustainable development of development zones. Following a brief description of NETDZs and their theoretical mechanisms with urban economic performance, industrialization, and urbanization, this study used a simultaneous equation model to generate empirical evidence of the impact of the establishment of NETDZs on urban economic performance and its channel effects through industrialization and urbanization. The results confirm that NETDZs exerts a positive and significant impact on urban economic performance, and NETDZs also show indirect influence in urban growth through urbanization. Although significant and positive intermediation of industrialization remains invalid, foreign direct investment and investment in fixed assets are still crucial in Chinese industrialization. Both industrialization and urbanization play an important role in Chinese urban economic development. Meanwhile, compared with eastern regions more influenced by urbanization, industrialization still acts as a major impetus in inland China. [ABSTRACT FROM AUTHOR]

To achieve carbon peak targets, realize carbon neutrality vision, and tackle global climate change, China must improve the carbon emission performance at the city level. Based on the carbon emission performance of 191 prefecture-level cities in China from 1997 to 2017, this paper analyses the evolution characteristics of urban carbon emission performance from three aspects: the overall spatial and temporal evolution, the differences according to both region and city size, and the differences among clusters categorized by carbon emission performance at the city level. This paper also reveals the impact of the social and economic transition on China's carbon emission performance. The results show that: (1) The overall level of carbon emission performance of Chinese cities is low, and there is a downward trend during the study period. The differences in carbon emission performance among cities are convergent, but there is a wide gap between high and low values. (2) The carbon emission performance of cities in eastern coastal areas is higher than that in non-coastal areas cities. Large urban agglomerations and economically developed regions, such as provincial capitals, are the agglomeration areas of high urban carbon emission performance values. (3) The carbon emission performance level of cities with similar sizes will converge. At the same time, such changes will enhance the differences among carbon emission performances at the city level within the same region. (4) Cities that belong to high urban carbon emission performance clusters are mainly distributed in the eastern region. Such cities are classified into large cities, supercities, and megacities. Compared with low urban carbon emission performance clusters, cities in high urban carbon emission performance clusters show a higher proportion in the medium-high level and high level of carbon emission performance. Moreover, cities in high urban carbon emission performance clusters are more likely to improve theirurban carbon emission performance. (5) The economic agglomeration effect, industrial structure adjustment and carbon intensity reduction have a significant impact on improving urban carbon emission performance. Population agglomeration has an incremental effect, and the anticipated benefits of environmental regulation have yet to be fully realized. The impacts of different clusters and different regions are variable. Finally, this paper advances policy enlightenment according to its research findings. [ABSTRACT FROM AUTHOR]

Restaurant recommendation is one of the most recommendation problems because the result of recommendation varies in different environments. Many methods have been proposed to recommend restaurants in a mobile environment by considering user preference, restaurant attributes, and location. However, there are few restaurant recommender systems according to the internet of vehicles environment. This paper presents a recommender system based on the prediction of traffic conditions in the internet of vehicles environment. This recommender system uses a phased selection method to recommend restaurants. The first stage is to screen restaurants that are on the user's driving route; the second stage is to recommend restaurants from the user attributes, restaurant attributes (with traffic conditions), and vehicle context, using a deep learning model. The experimental evaluation shows that the proposed recommender system is both efficient and effective. [ABSTRACT FROM AUTHOR]

Polyester fabric (PET fabric) has aroused widespread attention from people thanks to the advantages of smooth feel, easy washing, quick-drying, high strength, and chemical resistance. However, PET fabric's wide application has been limited by its hydrophobicity, poor resistance to bacterial contamination, and static accumulation. Herein, a super-hydrophilic PET fabric was achieved via a spray-drying layer-by-layer self-assembly method for comfortable garment manufacturing. The as-prepared PET fabric exhibited good superhydrophilicity, excellent antistatic property, and durable antibacterial performance. Moreover, the water contact angle of the treated fabric decreased to 0° from 121° of the original PET fabric, and the capillary height also increased from 7.1 cm to 21.4 cm. Besides, the treated fabric showed a durable antibacterial rate of 99.5% against both Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) after ten standard washing cycles. The prepared fabric was also identified with good cytocompatibility, making it a good material for garments in real life. Promisingly, this novel approach can be easily integrated into the finishing of textiles and is expected to be applied to various substrates with superhydrophilic and antibacterial properties. [ABSTRACT FROM AUTHOR]

[Display omitted] • STPP/CA can improve the parameter k of mixed-grained quartz. • STPP/CA can improve the selection function S 1 and the breakage function of single-grained quartz. • The surface properties and grindability of quartz are improved by STPP/CA. • The variation of kinetic parameters is consistent with the variation of quartz surface properties. The kinetic parameters of a grinding process can be used to study the variations in particle size reductions and grinding efficiencies. Appropriate grinding aids usually change the surfaces of a material and the properties of the pulp, thus improving the grinding efficiency. In this paper, pure quartz samples with mixed particle sizes and single particle sizes were selected as the raw materials. The effects of different sodium tripolyphosphate (STPP) and citric acid (CA) dosages on the dynamic parameters k , selection function S 1 and breakage function B for quartz grinding were studied. The results showed that the STPP and CA enhanced the grinding process of the quartz. In other words, the parameter k , the selection function S 1 and the breakage function B were all increased to varying degrees. The results of SEM, BET and contact angle measurements showed that the surfaces of the quartz particles became rounder, the specific surface area and average pore size increased, and the surface hydrophilicity increased. As a result, the grindability of the quartz increased, and the grinding kinetic parameters changed. Finally, the results showed that the improvements in the quartz grindability were consistent with the influence of grinding aids on the kinetic parameter k , selection function S 1 and breakage function B i,1. [ABSTRACT FROM AUTHOR]

Graph Neural Networks (GNNs) have received considerable attention in recent years due to their unique ability to model both topologies and semantics in the graphs. In this paper, we explore the use of GNNs in learning low-dimensional node representations in Heterogeneous Information Networks (HINs), which retain rich semantic information across multiple types of nodes and relations. Existing methods for HINs generally focus on modeling heterogeneity at either the node level or the relation level, but not both. As a result, these methods often fall short of optimal performance. To address this issue, we propose a novel Semantic- and Relation-aware Heterogeneous Graph neural Network, dubbed SR-HGN, which jointly incorporates rich semantics preserved on nodes and relations. Our approach involves projecting the HINs into a low-dimensional vector space through two steps: node-level aggregation and type-level aggregation. The node-level aggregation employs an attention mechanism to create relation vectors by aggregating messages from neighborhoods connected via the same type of relation. The type-level aggregation leverages relation vectors to aggregate node representations. In particular, we introduce semantic-aware attention and relation-aware attention in the type-level aggregation to model the contributions of relation vectors, in order to simultaneously gain knowledge from node semantics and relational information. Unlike other approaches that rely on pre-defined meta-paths, our model can be readily applied to most real-world applications without requiring any domain knowledge. To validate the effectiveness of our proposed approach, we conducted extensive experiments on three public datasets. Experimental results demonstrate that the SR-HGN significantly outperforms state-of-the-art baselines on node classification and node clustering tasks. [ABSTRACT FROM AUTHOR]

Thanks to the booming development of wearable electronics, finding a facile approach to integrate electronics to textiles becomes attractive. However, many disadvantages such as trivial fabrication steps, limitations of textile substrate types and unavoidable damage to textiles’ natural properties, have hampered the development of wearable electronics. In this work, pressure responsive PET fabrics were produced through a facile fabrication of conductive PET fabrics. Firstly, fine conductive adhesives (CA) with good printing performance were prepared by utilizing alcohols-assisted dispersion to prevent Ag NPs’ aggregation tendency in waterborne polyurethane (WPU). Then, screen printing on PET fabrics and subsequently treated with solvent system that consisted diallyldimethylammonium chloride (DADMAC), dichloromethane (DCM) and ethanol to construct conductive wrinkles at room temperature. With the help of WPU’s swelling, the conductive path was generated by Ag NPs spontaneous aggregation and the as-prepared conductive PET fabrics demonstrated outstanding electric conductivity (0.01 Ω·m). Finally a simple self-assembly PET fabrics pressure sensor based on the conductive PET fabrics exhibited superior performance, including the synchronous response to thumb pressing (frequency was 0.5 Hz), precisely distinction current of different weights, decent bending stability, fast response (63 ms) and relaxation time (23 ms), simultaneously possessing advantages of low cost and facile fabrication process. Based on its superior performance, the PET fabric sensor was developed to monitor the human fist behavior at different frequency (0.25 Hz and 1 Hz) and its good real-time response current, meeting the potential application requirements in wearable electronics and “smart textiles” for monitoring human’s movement behavior. [ABSTRACT FROM AUTHOR]

Flexible conductive circuits on PET fabrics were fabricated by a simple approach. Firstly, well dispersed nano-silver colloids with average size of 87 nm were synthesized with poly (vinyl pyrrolidone). Then, by adding polyurethane and thickening agent into these colloids, Ag NP-based ink was produced and printed on PET fabrics by screen printing. Conductive patterns were achieved through the swelling process of polyurethane and the decrease of contact resistance between nano-silver particles when immersed in dichloromethane (DCM) and diallyldimethylammonium chloride (DMDAAC) mixed solution. After it was dried at 40 °C,the surface resistivity was about 0.197 Ω cm with width 1.9 mm, and thickness 20 μm. Moreover, the effects of different DCM contents on the conductivity and the film forming ability have been investigated. We believe these foundings will provide some important analysis for printing flexible conductive circuits on textiles. [ABSTRACT FROM AUTHOR]

Monodisperse silver nanoparticles conductive ink was successfully synthesized by in-situ synthesis method in an aqueous solution. The size distribution of the Ag nanoparticles was tested and the average diameter was within 10 nm. A spontaneous coalescence and sintering of Ag NPs at 60 °C for 30 min was realized in the presence of hydrogen chloride. The interface bonding between dispersant and silver nanoparticles was investigated by XRD and FTIR. The conductive ink doped with polyaniline has a good adhesion to cotton surface and better conductivity. The highest conductivity was 2 × 10 −5 Ω m when the silver content was 30 wt.%. This prepared conductive ink could be printed on cotton fabric to form conductive circuits and the conductivity can remain at least 30 days. These promising results suggest applications of printed electronics devices using textiles as substrates. [ABSTRACT FROM AUTHOR]

We investigated the factors influencing the progression of the pandemic from a global perspective by using the Geodetector and Correlation methods and explored the pandemic response policies and effects in different countries. The results yielded three notable findings. First, empirical results show the COVID-19 pandemic is influenced by various factors, including demographic and economic parameters, international travelers, urbanization ratio, urban population, etc. Among them, the correlation between urban population and confirmed cases is strongest. Cities become the key factor affecting the COVID-19 pandemic, with high urbanization levels and population mobility increases the risk of large-scale outbreaks. Second, among control measures, School-closures, International-travel-restrictions, and Public-gathering-restriction have the best control effect on the epidemic. In addition, the combination of different types of control measures is more effective in controlling the outbreak, especially for Public-gathering-restrictions ∩ School-closures, International-travel-restrictions ∩ Workplace-closures, Public-transport-restrictions ∩ International-travel-restrictions. Third, implementing appropriate control measures in the first month of an outbreak played a critical role in future pandemic trends. Since there are few local cases in this period and the control measures have an obvious effect. • Analysis the evolution and control of COVID-19 pandemic from global perspective. • The pandemic has been most severe in countries with high urbanization proportion, large urban populations. • The pandemic evolution is influenced by population, economic, urban, mobility characteristics and policy control factors. • School-closures, International-travel-restrictions, and Public-gathering-restriction have the best control effect. • The combination of different types of control measures is more effective in controlling the outbreak. • Corresponding control measures in the first month of the outbreak plays an important role in future trends of the pandemic. [ABSTRACT FROM AUTHOR]

In this paper, different dosages of TIPA, TEA and their combined grinding aid were added to the process of quartz grinding and their influence on the grinding efficiency and flotation recovery in DDA system was investigated. From the grinding and flotation experiments, It can be known that the effect of the combined grinding aid was better than that of a single reagent, which can not only significantly improve the grinding efficiency of quartz, but also increase the recovery of quartz from flotation. Based on the results of FT-IR spectroscopy, XPS analysis, quantum chemistry and solution chemistry calculations, it can be seen that the hydroxyl groups in the TIPA/TEA combined grinding aid formed hydrogen bonds with O on the (101) surface of quartz, while collector DDA was mainly electrostatically adsorbed on the surface of quartz with negative potential, and the introduction of combined grinding aid improved the adsorption of DDA, the grinding aid and collector played a synergistic role instead of competitive adsorption. The detection of contact angle and surface tension showed that the combined grinding aid can improve the hydrophobicity of quartz, reduce the surface tension and CMC value of DDA, and enhance the dispersibility of quartz, therefore, it can increase the recovery of quartz from flotation. [Display omitted] • TIPA/TEA can significantly improve grinding efficiency of quartz. • TIPA/TEA combined grinding aid can increase the recovery of quartz in DDA system. • Grinding aid and collector played a synergistic role instead of competitive adsorption. • TIPA/TEA can promote the adsorption of DDA. [ABSTRACT FROM AUTHOR]

With the widespread concern of oily wastewater discharge and environmental protection, the efficient electrospun nanofiber membrane has fascinated strenuous attention owes to its uniform pore distribution and adjustable wettability. However, the common modification methods of nanofiber membranes, such as surface coating and grafting, have complicated procedures and low grafting rate, which limits their wide application in practical applications. Hence, a polyvinylidene fluoride (PVDF), polyvinylpyrrolidone (PVP) and inorganic titanium dioxide (TiO 2) nanoparticles blend nanofiber membrane was prepared by convenient one-step electrostatic spinning. The existence of PVDF provides certain strength and chemical resistance property, and the PVP benefits the loading of TiO 2 NPs and improves the hydrophilicity as well as mechanical strength of the membrane. The introduction of these three components makes the porous nanofiber membrane have a hierarchical rough structure, and appear hydrophilic in the air and oleophobic under water. The obtained membrane thus shows excellent separation efficiency (98.4%) for different emulsions, desirable antifouling property with a high flux recovery rate (FRR 95.68%) and a low total fouling ratio (15.18%) after several cycles. This strategy will be a facile and promising method of preparing reusable and functional separation membranes. [Display omitted] • The PVDF membrane was prepared by one-step electrostatic spinning. • The membrane was modified by adding water-soluble polymer PVP and TiO 2. • The membrane showed durable anti-fouling and oil-water separation properties. [ABSTRACT FROM AUTHOR]

• Electroless plating Pd-activated nanofibrous membranes. • The electrodes with a nylon network are assembled into a sensitive pressure sensor. • The capacitive pressure sensor is suitable for practical human motions' detection. The flexible and wearable capacitive pressure sensors are widely used in healthcare monitoring, robotics manufacture and military equipment. These types of highly sensitive pressure sensors can be realized by designing micro-structure electrodes or dielectric layers on a wearable smart device. Herein, we prepare a flexible and conductive electrode through electrospinning of palladium ions (Pd2+)/polyacrylonitrile (PAN) solution and followed by electroless plating of the hybrid nanofibrous membranes. The FESEM images showed that the obtained conductive nanofibrous membrane was covered by a coral-like silver layer with porosity benefiting for excellent electrical conductivity. Based on the superior performance, it is used as the electrodes and jointly assembled into a full microporous structure sensor with the high-mesh nylon netting. Benefitting from the dramatically alterable contact area of the electrode and the good dielectricity of nylon netting, the as-prepared sensor exhibits a high sensitivity of 1.49 kPa−1, a fast response time of 48 ms, low hysteresis of 7.55% and stable durability over 1000 cycles. Besides, practical human motions' detection is carried out by this wearable pressure sensor. The simulation of the finite elemental analysis is used to explain the mechanism of the sensor. This fabrication method is facile, low-cost, and less metal pollution, which may provide an insight to design microstructures for improving the performance, and imply an accessible prospect in the industrialization of sensors. [ABSTRACT FROM AUTHOR]

Upcycle of waste fabrics has been a promising project since it can reduce textile pollution and provide a prospect to waste management. In this work, a multiple recyclable transparent functional film was fabricated through ionic liquid (IL) assisted regeneration process with a higher yield of 90.40 %, compared with other polymer regeneration process using IL. Fourier Transfer Infrared Spectroscopy (FTIR), X-ray diffraction (XRD), UV–vis Spectrophotometer, as well as tensile strength test were carried out to explore the performance of the regenerated jute film. This transparent renewable jute film can be made into many functional materials, like packaging materials, electrically conductive films or information storage devices. Furthermore, it can be dissolved in IL and regenerate new films for multiple cycles, which can still maintain a relatively high transparency and a considerable mechanical property. Compared to other fabric recycle process, the solvent and production both can be effectively recycled, which can be considered as a green and sustainable tool to manage waste fabrics. [ABSTRACT FROM AUTHOR]

The self-wrinkling coating with surface microphase morphology and hierarchical cross-linked structure for impact resistance and mechanical enhancement. [Display omitted] Protective materials are essential for personal, electronic, and military defenses owing to their efficient impact-resistant and energy-absorbing properties. Inspired by the bottom-up fabrication process and energy dissipation mechanism of natural organisms with hierarchical structures, we demonstrated a self-wrinkled photo-curing coating as a new protective material for enhancing the anti-impact property of the substrates. Owing to the self-assembly of polydimethylsiloxane (PDMS) containing polymeric photoinitiator on the surface, the liquid coating formulation was photo-cured by one-step UV irradiation with simultaneous generation of self-wrinkled surface morphology and a gradient cross-linked architecture. The maximum impact resistance height (h max) of the glass substrate coated with plain coating increased from 120 to 180 cm when coated with wrinkled gradient coating. Furthermore, the Young's modulus, fracture stress, and toughness of the wrinkled gradient coating film improved from 39.6 MPa, 2.4 MPa, and 74.1 MJ/cm3 to 235.0 MPa (∼5× increase), 18.5 MPa (∼6.6× increase), and 845.0 MJ/cm3 (∼10.8× increase) compared to the pure coating film as reference. The theoretical simulation and experimental results proved that the surface self-wrinkled morphology and intrinsic hierarchical architecture contribute to the energy dissipation and impact resistance of the cured coating. The photo-curing process, a bottom-up strategy, is conducted in a non-contact mode compared with nano-printing and lithography, enabling bulk materials to be engineered. [ABSTRACT FROM AUTHOR]

• A simple way to upcycle wasted wool fabrics to WK/IL/PAN nanofibrous membrane. • Inhibiting 89.21% strains of E. coli , and 60.70% of S. aureus. • Performance of high moisture permeability. • IL can be recycled through distilled water, making the process sustainable. Wasted wool fabrics are a kind of textile waste source and the upcycle of them can not only benefit the environmental protection, but also turn waste into treasure by developing other potential applications. In this work, ionic liquid (IL) 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) was used as a green solvent to upcycle wasted wool fabrics into a wool keratin (WK)/IL/polyacrylonitrile (PAN) composite nanofibrous membrane with good antibacterial and high moisture permeability through electrospinning. The morphology and structure of the regenerated nanofibrous membrane were characterized by Scanning Electronic Microscopy (SEM), Energy Dispersive Spectrometer (EDS), Fourier Transfer Infrared Spectroscopy (FTIR). The antibacterial test demonstrates that it has 89.21% inhibition rate against E. coli , and 60.70% against S. aureus. Furthermore, the keratin containing in the membrane can effectively improve the hydrophilic property of it, as Moisture Management Test (MMT) indicates that it performs an excellent wetting performance and water transport property. In addition, IL is supposed to be recycled from the composite membrane through immersing in distilled water, which makes the fabrication process green and sustainable. [ABSTRACT FROM AUTHOR]

In this paper, titanium dioxide (TiO2)/quaternary phosphonium salts (QPS)/polyacrylonitrile (PAN) composite nanofibrous membranes were prepared through electrospinning to fabricate organic and inorganic complex highly efficient antibacterial and ultraviolet (UV)-resistant membranes. The composite material derived from QPS was designed effectively kill bacteria and improve quaternary ammonium salts' drug-resistant problem, while the addition of TiO2 can absorb ultraviolet light to catalyze sterilization and decompose residues. The obtained membranes were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transfer infrared spectroscopy (FTIR), thermogravimetric analysis (TG), ultraviolet protection factor (UPF), and antibacterial tests. SEM images indicate slim and uniform morphology of fibers with a diameter of 0.1–0.2 um. FTIR and XPS tests confirm the existence of QPS and TiO2 compounds in the composite membranes, and there is no chemical bond between these substrates and PAN. TG test implies that the membranes have a good thermal stability. UPF of 1648.1 and UVA transmittance of 0.28% indicate that the TiO2/QPS/PAN membranes have an extraordinary UV resistance property. The antibacterial tests show that complex membranes have 99.99% antibacterial rate against both gram-negative Escherichia coli and gram-positive Staphylococcus aureus. [ABSTRACT FROM AUTHOR]

• Studies partial discharge induced thermal decomposition of composite insulator epoxy. • Analyzes 200–1000 °C pyrolysis products of anhydride-cured bisphenol A epoxy resin. • Crosslinking points cleave below 360 °C; epoxy main chains break above 380 °C. • Formed gases, swelling-induced liquids and acids can impact insulator components. • Proposes product formation mechanisms and mitigating strategies to their effects. Epoxy/anhydride thermoset matrix within composite insulator core rods may thermally decompose by temperature rise caused by partial discharge. The thermal decomposition characteristics of the epoxy/anhydride thermoset was analyzed using pyrolysis-gas chromatography-mass spectrometry (PY–GC–MS) from 200 to 1000 °C, including the mechanisms of crosslinked network scission and the formation of gaseous or liquid products with potential secondary effects on surrounding materials. Below 360 °C, scission at crosslinking points predominates by ceiling temperature behavior, forming anhydrides. Above 380 °C, scission of main chains leads to the production of corresponding fragments. Beyond 600 °C, decomposition of anhydrides and fragments from main chains leads to the formation of lower molecular weight substances. During the pyrolysis process, organic acids are formed from 240 °C to 1000 °C. Above 600 °C, gases with high vapor pressures and liquids that can induce swelling are produced. These byproducts can have secondary effects on surrounding materials, including the failure of interfacial adhesion, swelling of silicone rubber sheaths, and a reduction in the mechanical strength of glass fibers. Consequently, these effects may accelerate the decay-like deterioration of core rods, characterized by a surface morphology reminiscent of rotting wood. These findings will inform the optimization of materials for enhanced electrical equipment performance and facilitate the evaluation of potential environmental impacts posed by the thermal decomposition of epoxy/anhydride thermosets in future applications. [ABSTRACT FROM AUTHOR]

• A novel LbL self-assembly method was used to prepare a light-responsive textile. • The prepared cotton fabric exhibits excellent photochromic properties. • The photochromic cotton fabric is expected to used in wearable smart textiles. Materials with reversible optical properties under light irradiation have great potential application in various optoelectronic fields. Particularly, photochromic materials have received extensive attention in many fields. Herein, a novel composite photochromic fabric was fabricated via Layer-by-Layer self-assembling of phosphomolybdic acid (PMoA) and polyacrylamide (PAM). Based on the established electron transfer photochromic system, the dynamic manipulation of photochromic behavior of the cotton fabric was achieved with outstanding fine high-resolution image under the visible light irradiation. The prepared fabric can change from colorless to blue rapidly (within 5 min) under UV light and maintain excellent reusability photochromic performance after more than 20 reversible color changing cycles, implying its great potential applications in the field of intelligent devices and UV detection in sunlight. Moreover, we constructed fabric weaving and developed a Quick Response (QR) code security identification to prove the practical application of the prepared photochromic fabric in the fields of wearable, optical information storage and information security encryption. [ABSTRACT FROM AUTHOR]

A flexible and lightweight solar ultraviolet (UV) detector compatible with cotton fabric is prepared by simple hydrogen bonding self-assembly of polyacrylic acid (PAA)and sodium deca-tungstate (SDT). Based on photochromism, the solar UV detector with good detection capabilities and the detection effect are obtained. The as-designed solar UV-induced electron transfer process imparts the detector quick response and visual color changes. The detector was tested on the spot in direct solar light and simulated solar light, which proved its outstanding performance as a flexible, wearable and visualized UV detector. Furthermore, the influence of solar doses and on-off cycle stability were studied. Therefore, the detection device fabricated can be used to indicate the intensity of UV lights by sensitive color changes, which provides a feasible idea for the preparation of novel UV detection devices. In this study, the cellulose fiber material cotton fabric was used as the substrate, and the layer-by-layer self-assembly of SDS and PAA was carried out on its surface using hydrogen bonds as the driving force, and a composite fabric with excellent sunlight UV detection performance was obtained. The ultraviolet rays in the sunlight induce the transfer of the electrons on the carboxyl group in the PAA and transfer to the hexavalent tungsten in the clustered SDS, causing it to undergo a reduction reaction, thereby having a rapid color change. In the entire system, the hydrogen bond is not only the driving force and the binding force, but also acts as a bridge for electron transfer between the two components. The electrons flow through the hydrogen bond and transfer between the two components, so that the composite fabric has a reversible sunlight and ultraviolet response. ability. In this study, the cost is low, the toxicity is small, the method is simple, and the response effect is quickly visualized. It has great application potential in smart clothing and ultraviolet detectors. Image 1 • A solar ultraviolet detector was prepared on the basis of hydrogen bonding LbL self-assembly. • The solar ultraviolet detector has the advantages of simple process, flexible, low cost, and visible detection effect. • The solar ultraviolet detector can quickly respond to different doses of the sunlight in 5 min. [ABSTRACT FROM AUTHOR]

The grinding process urgently needs to address the technical challenges of high energy consumption and low efficiency. In this paper, in order to improve the efficiency of magnesite grinding process, sodium tripolyphosphate (STPP) was selected as a grinding aid. Grinding tests showed that STPP significantly improved the mass fraction of − 0.074 mm in grinding products by 6.8% points. The mechanism of STPP on grinding process was analyzed by Fourier transform infrared spectrum (FT-IR) measurement, contact angle detection, zeta potential test, specific surface area and scanning electron microscopy (SEM) tests. The FT-IR and contact angle measurement results indicated that STPP had chemical and physical adsorption on magnesite surface, which improved its hydrophilicity, and promote water wetting action furtherly. So it can improve the grindability of magnesite. It can be seen by zeta potential detection that STPP increased the absolute value of magnesite to increase the electrostatic repulsion energy between particles (U E). And then, the dispersion of particles was improved. In addition, specific surface area and SEM tests indicated that STPP can increase the specific surface area of grinding products, and extend the defects and cracks of magnesite surface. [Display omitted] • Sodium tripolyphosphate can improve the grinding efficiency of magnesite. • Sodium tripolyphosphate had chemical and physical adsorption on the surface of magnesite. • Sodium tripolyphosphate improved the grindability and dispersion of magnesite in the grinding process. [ABSTRACT FROM AUTHOR]