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Bio-Based Waterborne Poly(Vanillin-Butyl Acrylate)/MXene Coatings for Leather with Desired Warmth Retention and Antibacterial Properties

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Engineering 2024年第5期36卷 250-263页

作者： jianzhong ma Li ma Lei Zhang Wenbo Zhang Qianqian Fan Buxing Han College of Bioresources Chemical and materials Engineering Shaanxi University of Science and TechnologyXi’an 710021China Xi’an Key Laboratory of Green Chemicals and Functional materials Xi’an 710021China College of Chemistry and Chemical Engineering Shaanxi University of Science and TechnologyXi’an 710021China Shaanxi Collaborative Innovation Center of Industrial Auxiliary Chemistry and Technology Shaanxi University of Science and TechnologyXi’an 710021China Institute of Chemistry Chinese Academy of SciencesBeijing 100190China

This study presents a solvent-free,facile synthesis of a bio-based green antibacterial agent and aromatic monomer methacrylated vanillin(MV)using *** resulting MV not only imparted antibacterial properties to coatings layered on leather,but could also be employed as a green alternative to petroleum-based carcinogen styrene(St).Herein,MV was copolymerized with butyl acrylate(BA)to obtain waterborne bio-based P(MV-BA)miniemulsion via miniemulsion ***,MXene nanosheets with excellent photothermal conversion performance and antibacterial properties,were introduced into the P(MV-BA)miniemulsion by ultrasonic *** the gradual solidification of P(MV-BA)/MXene nanocomposite miniemulsion on the leather surface,MXene gradually migrated to the surface of leather coatings due to the cavitation effect of ultrasonication and amphiphilicity of MXene,which prompted its full exposure to light and bacteria,exerting the maximum photothermal conversion efficiency and significant antibacterial *** particular,when the dosage of MXene nanosheets was 1.4 wt%,the surface temperature of P(MV-BA)/MXene nanocomposite miniemulsioncoated leather(PML)increased by about 15℃ in an outdoor environment during winter,and the antibacterial rate against Escherichia coli and Staphylococcus aureus was nearly 100%under the simulated sunlight treatment for 30 ***,the introduction of MXene nanosheets increased the air permeability,water vapor permeability,and thermal stability of these *** study provides a new insight into the preparation of novel,green,and waterborne bio-based nanocomposite coatings for leather,with desired warmth retention and antibacterial *** can not only realize zerocarbon heating based on sunlight in winter,reducing the use of fossil fuels and greenhouse gas emissions,but also improve ability to fight off invasion by harmful bacteria,viruses,and other microorganisms.

关键词： MXene nanosheets Vanillin Styrene substitute Leather coating Photothermal conversion Warmth retention Antibacterial properties

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Atmospheric extinction properties in Shenyang,China

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Particuology 2015年第1期13卷 120-126页

作者： Ningwei Liu Yanjun ma jianzhong ma Yangfeng Wang Suying Yang Liguang Li Chinese Academy of Meteorological Sciences Nanjing University of Information Science & Technology Institute of Atmospheric Environment China Meteorological Administration

Atmospheric visibility impairment due to human activities is becoming increasingly significant in metropolitan 8henyang, China. In this study, hourly data of relevant factors throughout the year 2010 in Shenyang were used to evaluate the local atmospheric extinction properties. The results show that the average coefficient of total extinction and aerosol single-scattering albedo in 2010 were 622.72 Mm^-1 and 0.87, respectively, values that are characteristic of the ＂municipal pollution type＂. Visibility is most impaired during winter and especially in January. The coefficient of total extinction exhibits a single daily cycle with a maximum at 5-6 am and a minimum at 3 pm. The mean extinction contributions of the constituents, from high to low, were particle scattering （87.49%）, particle absorption, gas absorption, and gas scattering. The extinction contribution of gas molecules was little more than 4.5%, far smaller than that of particles. Scattering by particles was the main contributor to extinction, especially in the morning and around midnight.

关键词： Atmospheric visibility Extinction properties Extinction contributions Partide scattering

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Seasonal variation in surface ozone and its regional characteristics at global atmosphere watch stations in China

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Journal of Environmental Sciences 2019年第3期31卷 291-302页

作者： Ningwei Liu Weili Lin jianzhong ma Wanyun Xu Xiaobin Xu Nanjing University of Information Science & Technology State Key Laboratory of Severe Weather & Cma Key Laboratory for Atmospheric Chemistry Chinese Academy of Meteorological Sciences Shenyang Institute of Atmospheric Environment China Meteorological Administration College of Life & Environmental Science Minzu University of China

We investigated the seasonal and spatial ozone variations in China by using three-year surface ozone observation data from the six Chinese Global Atmosphere Watch(GAW)stations and tropospheric column ozone data from satellite retrieval over the period2010–2012. It is shown that the seasonal ozone variations at these GAW stations are rather different, particularly between the western and eastern locations. Compared with western China, eastern China has lower background ozone levels. However, the Asian summer monsoon(ASM) can transport photochemical pollutants from the southern to the northern areas in eastern China, leading to a northward gradual enhancement of background ozone levels at the eastern GAW stations. Over China, the tropospheric column ozone densities peak during spring and summer in the areas that are directly and/or indirectly affected by the ASM, and the peak time lags from the south to the north in eastern China. We also investigated the regional representativeness of seasonal variations of ozone at the six Chinese GAW stations using the yearly maximum tropospheric column month as *** results show that the seasonal variation characteristics of ozone revealed by the Chinese GAW stations are typical, with each station having a considerable large surrounding area with the ozone maximum occurring at the same month. Ozone variations at the GAW stations are influenced by many complex factors and their regional representativeness needs to be investigated further in a broader sense.

关键词： Surface ozone Tropospheric ozone column GAW stations Seasonal variations Regional representativeness

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All-inorganic TiO_(2)/Cs_(2)AgBiBr_(6) composite as highly efficient photocatalyst under visible light irradiation

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Frontiers of Chemical Science and Engineering 2023年第12期17卷 1925-1936页

作者： jianzhong ma Lu Wen Qianqian Fan Siying Wei Xueyun Hu Fan Yang College of Bioresources Chemical and materials Engineering Shaanxi University of Science and TechnologyXi’an 710021China College of Chemistry and Chemical Engineering Shaanxi University of Science and TechnologyXi’an 710021China Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry(Ministry of Education) Shaanxi University of Science and TechnologyXi’an 710021China Xi’an Key Laboratory of Green Chemicals and Functional materials Shaanxi University of Science and TechnologyXi’an 710021China College of Environmental Science and Engineering Shaanxi University of Science and TechnologyXi’an 710021China

In recent years, limited photocatalysis efficiency and wide band gap have hindered the application of TiO_(2) in the field of photocatalysis. A leading star in photocatalysis has been revealed as lead-free Cs_(2)AgBiBr_(6) double halide perovskite nanocrystals, owing to its strong visible light absorption and tunable band gap. In this work, this photocatalytic process was facilitated by a unique TiO_(2)/Cs_(2)AgBiBr_(6) composite, which was identified as an S-cheme heterojunction. TiO_(2)/Cs_(2)AgBiBr_(6) composite was investigated for its structure and photocatalytic behavior. The results showed that when the perovskite dosage is 40%, the photocatalytic rate of TiO_(2) could be boosted to 0.1369 min^(-1). This paper discusses and proposes the band gap matching, carrier separation, and photocatalytic mechanism of TiO_(2)/Cs_(2)AgBiBr_(6) composites, which will facilitate the generation of new ideas for improving TiO_(2)’s photocatalytic performance.

关键词： Cs_(2)AgBiBr_(6)nanocrystals visible-light photocatalyst Cs_(2)AgBiBr_(6) TiO_(2)heterojunction

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High performance strain sensor based on leather activated by micro-cracking conductive layer

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Collagen and Leather 2023年第4期5卷 76-87页

作者： jianzhong ma Zhijie Cheng Sha Tan Tian Zheng Yan Zong College of Bioresources Chemical and materials Engineering Shaanxi University of Science and TechnologyXi'an 710021China Xi'an Key Laboratory of Green Chemicals and Functional materials Xi'an 710021China materials Characterization and Fabrication Platform Department of Chemical EngineeringUniversity of MelbourneParkvilleMelbourne 3010Australia

Flexible strain sensors are capable to detect external force induced strain change owing to their unique ability to convert deformation into electrical ***,micro/nano patterning of conductive layer in strain sensor is an effective method to improve its sensitivity,however the sophisticated manipulation process is limited only in laboratory *** this report,a simple and scalable fabrication strategy was used to create micro-cracking conductive layer as an alternative patterning method to achieve high performance of strain *** details,the sensor was fabricated using leather as the substrate to filtrated acidified multi-walled carbon nanotubes(a-MWCNTs)/layered double hydroxides(LDHs)*** stretching process,micro-cracking structure emerged on the percolated a-MWCNTs/LDHs layer,causing a rise up of resistance according to increasing strain and generated a detectable electrical *** prepared sensor had a large detecting range(60%),high sensitivity(GF of 7238.92 at strain 30-60%),fast response(tensile response time of 270 ms),good stability and *** sensor also inherited the advantages of leather,such as biodegradability and good air permeability,and the introduction of a-MWCNTs/LDHs further enhanced its fire retardancy *** features ensured the sensor as an eco-friendly,comfortable and safe electronic device for human motion detection.

关键词： a-MWCNTs LDHs Leather Flexible strain sensor

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Close-loop recyclable and flexible halide perovskite@wool keratin sensor with piezoelectric property

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Journal of Energy Chemistry 2023年第9期84卷 428-435页

作者： Yingying Zhou Dangge Gao Bin Lyu Chi Zheng Litao Tang Shihao Guo jianzhong ma College of Bioresources Chemical and materials Engineering Shaanxi University of Science and TechnologyXi'an 710021ShaanxiChina Xi'an Polytechnic University Xi'an 710048ShaanxiChina National Demonstration Center for Experimental Light Chemistry Engineering Education(Shaanxi University of Science&Technology) Xi'an 710021ShaanxiChina Xi'an Key Laboratory of Green Chemicals and Functional materials Xi'an 710021ShaanxiChina

Halide perovskites with excellent piezoelectric properties,but their poor stability hinders their largescale ***,a sandwich-structured halide perovskite flexible sensor with good stability was developed according to a three-step procedure as follows:(ⅰ) in-situ growth of wool keratinCsPbBr_(3)(WK-CsPbBr_(3)) using wool keratin in interfacial passivation and coating,(ⅱ) electrospinning of a wool keratin-CsPbBr_(3)/polyacrylonitrile(WCP) nanofiber film,and(ⅲ) coating of the WCP nanofiber with polydimethylsiloxane(PDMS) to obtain a sensor(WCPP).The sensor could generate a piezoelectric voltage of 7.8 V at a pressure of 6 kPa in the stages of pressing and releasing,and the output characteristics did not decline even after 10,000 *** to the 4-month stability of the perovskite sensor,WCPP sensor exhibited the output performance even after 16 months,which indicated that wool keratin as a multidentate improved the stability of the halide ***,the sensor displayed a self-cleaning property and could also light up 14 commercial *** close-loop recycling of the lead halide perovskite was achieved by dissolving the WCP nanofiber film in DMF and then ***,the method proposed is a step forward for achieving the commercialization of WK-CsPbBr_(3) and providing new avenues for further utilization of wool waste.

关键词： Piezoelectric Halide perovskite Wool keratin Sensor Human monitoring

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Recent Enhanced Deep Troposphere-to-Stratosphere Air mass Transport Accompanying the Weakening Asian Monsoon

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Journal of Meteorological Research 2024年第4期38卷 708-719页

作者： Bin CHEN jianzhong ma Wei ZHANG Jianchun BIAN Tianliang ZHAO Xiangde XU State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesChina Meteorological AdministrationBeijing100081China Department of Plants Soils and ClimateUtah State UniversityUT84322USA Key Laboratory of Middle Atmosphere and Global Environment Observation Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological AdministrationNanjing University of Information Science&TechnologyNanjing 210044China

The Asian monsoon(AM) region is a well-known region with prevailing stratosphere–troposphere exchange(STE).However,how the STE across this region changes with the weakening AM remains ***,we particularly diagnose the air mass transport between the planetary boundary layer(PBL) and the stratosphere over the AM region during 1992–2017 using the Lagrangian particle dispersion model FLEXPART based on the ERA-Interim reanalysis *** results show that both the downward and upward deep STEs exhibit a detectable increasing trend,while the latter,namely,the deep troposphere-to-stratosphere transport(DTST),is relatively more *** analysis reveals that the long-term trend of DTST over the AM region could be partly attributed to changes in the Pacific Walker circulation and the air temperature(especially at upper levels).Additionally,it is found that DTST increases markedly over the tropical oceanic regions,while the increasing DTST into the stratosphere can be attributed to the enhanced air masses originated from the PBL over the terrestrial regions,where large amounts of pollutant emissions *** results imply that the influence of the DTST on the chemical composition and the climate of the stratosphere over the AM region is expected to become increasingly important,and is thereby of relevance to climate projection in an evolving climate.

关键词： stratosphere–troposphere exchange(STE) air mass transport deep troposphere-to-stratosphere transport(DTST) Asian monsoon(AM) pollution

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Tropospheric NO_2 vertical column densities retrieved from ground-based maX-DOAS measurements at Shangdianzi regional atmospheric background station in China

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Journal of Environmental Sciences 2019年第6期31卷 186-196页

作者： Siyang Cheng jianzhong ma Weiping Cheng Peng Yan Huaigang Zhou Liyan Zhou Peng Yang State Key Laboratory of Severe Weather & Cma Key Laboratory of Atmospheric Chemistry Chinese Academy of Meteorological Sciences China Waterborne Transport Research Institute Cma Meteorological Observation Centre Shangdianzi Regional Air Background Station Beijing Meteorological Bureau Meteorological Bureau of Shijiazhuang

Ground-basedMulti-AXis Differential Optical Absorption Spectroscopy(maX-DOAS)measurements were performed at Shangdianzi(SDZ)regional atmospheric background station in northern China from march 2009 to February *** tropospheric NO_2vertical column densities(VCDs)were retrieved to investigate the background condition of the Beijing–Tianjin–Hebei developed economic circle in *** seasonal variation of mean NO_2tropospheric VCDs(VCD_(Trop))at SDZ is apparent,with the maximum(1.3×10^(16)molec/cm^2)in February and the minimum(3.5×10^(15)molec/cm^2)in August,much lower than those observed at the Beijing city *** average daytime diurnal variations of NO_2VCD_(Trop )are rather consistent for all four seasons,presenting the minimum at noon and the higher values in the morning and *** largest and lowest amplitudes of NO_2VCD_(Trop)diurnal variation appear in winter and in summer,*** diurnal pattern at SDZ station is similar to those at other less polluted stations,but distinct from the ones at the urban or polluted *** NO_2VCDs at SDZ are strongly dependent on the wind,with the higher values being associated with the pollution plumes from Beijing *** NO_2VCDs derived from ground-based maX-DOAS at SDZ show to be well correlated with corresponding OMI(Ozone Monitoring Instrument)satellite products with a correlation coefficient R=***,the OMI observations are on average higher than maX-DOAS NO_2VCDs by a factor of 28%,probably due to the OMI grid cell partly covering the south of SDZ which is influenced more by the pollution plumes from the urban areas.

关键词： Ground-basedmaX-DOAS Tropospheric NO2 Satellite validation Pollution plume Regional atmospheric background station

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Insights into functional polymer-based organic-inorganic nanocomposites as leather finishes

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Journal of Leather Science and Engineering 2019年第1期1卷 23-32页

作者： Qianqian Fan jianzhong ma Qunna Xu College of Bioresources Chemical and materials Engineering Shaanxi University of Science and TechnologyXi’an 710021China Key Laboratory of Leather Cleaner Production China National Light IndustryXi’an 710021China

Nowadays,the increasing demands from consumer challenges the traditional leather *** polymer leather finishes gradually lose their dominant position in the *** address this issue,recent research effort has been devoted to developing polymer-based organic-inorganic nanocomposite leather finishes due to their various functional properties including antibacterial,self-cleaning and water-resistant *** this review,we provide a comprehensive overview of synthesis of polymer-based organic-inorganic nanocomposites and their application as functional leather *** the perspective of their properties and current challenges,an outlook in the future development about crafting functional and high-quality leather finishes are further proposed.

关键词： Organic-inorganic nanocomposites Polymer Functional leather finishes

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Influence of multi-chemical-component aerosols on the microphysics of warm clouds in North China

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Science China Earth Sciences 2011年第3期54卷 451-461页

作者： YANG SuYing ma jianzhong HU ZhiJin YAN Peng CHEN Yue WANG Wei Laboratory for Atmospheric Physics and Environment Nanjing University of Information Science and Technology Nanjing 210044 China Chinese Academy of Meteorological Sciences Beijing 100081 China Chinese Research Academy of Environmental Sciences Beijing 100012 China

An adiabatic bin-sized cloud parcel model is developed by incorporating the multi-chemical-component (MCC) aerosol effects into the UWyo single-chemical-component (SCC) parcel model. The effects of MCC aerosols on the warm cloud microphysics in North China are investigated with the model. The simulations are initialized using the data on chemical components and number size distribution of aerosols measured during the IPAC (Influence of Pollution on Aerosols and Cloud Microphysics in North China) campaign in spring 2006. It is found that the MCC aerosols in North China increase the cloud droplet number concentration (CDNC) and decrease the effective radius more efficiently than pure ammonium-sulfate aerosols. It is also shown that the MCC aerosols in North China can narrow the cloud droplet spectra (CDS) by increasing CDNC in small size and decreasing CDNC in large size. Our results indicate that aerosol chemical components and their size distributions can influence the microphysics of warm clouds, and thus affect atmospheric radiation and precipitation. This should attract more attentions in weather and climate change research in the future.

关键词： aerosols chemical component CCN cloud microphysics cloud model

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