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Effect of phase Separation Size on the properties of Self-healing Elastomer

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Chinese Journal of polymer Science 2024年第6期42卷 798-804页

作者： Jun Xu Lei Zhu Xian-Qi Feng Cong sui Wen-p.ng Zhao Shou-Ke Yan School of Chemical Engineering Qingdao University of Science&TechnologyQingdao266042China College of Engineering Yanching institute of TechnologyLangfang065210China Key Laboratory of Rubber-plastics Qingdao University of Science&TechnologyQingdao266042China State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing100029China

Regulation of phase structure has been recognized as one of the most effective ways to fabricate self-healing polymers with high mechanical *** mechanical properties of the resultant polymers are certainly affected by the size of separated phase ***,the study on this aspect is absence,because it can hardly exclude the influence of variation in monomer proportion required for tuning the separated phase ***,we report the first study on tuning the phase size through reversible addition-fragmentation chain transfer(RAFT)polymerization without changing the proportion of *** expected,the size of separated phase has been successfully mediated from 15 nm to 9 nm by tuning the molecular weight of the chain transfer *** is found that the mechanical strength and the self-healing efficiency of the resultant polymers increase simultaneously with the decrease of phase *** study on the formation kinetics of hydrogen bonds reveals that the decrease of phase size can facilitate the re-bonding rate of hydrogen bonds,even if the migration of polymer chains is restricted.

关键词： Self-healing polymers phase separation Reversible addition-fragmentation chain transfer

CO_(2)/NOx-involved Electrochemical C-N Coupling Reactions

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Chemical Research in Chinese Universities 2024年第5期40卷 764-775页

作者： sui Xiqing WU Limin JIA Shunhan JIN Xiangyuan SUN Xiaofu HAN Buxing Beijing National Laboratory for Molecular Sciences Key Laboratory of Colloid and Interface and ThermodynamicsCenter for Carbon Neutral ChemistryInstitute of ChemistryChinese Academy of SciencesBeijing100190P.R.China School of Chemical Sciences University of Chinese Academy of SciencesBeijing100049P.R.China Shanghai Key Laboratory of Green Chemistry and Chemical processes School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai200062P.R.China

With the excessive use of fossil fuels leading to significant CO_(2)emissions,and the continuous increase of NOx in water bodies and soils,the use of electrochemical methods for the conversion of CO_(2)and NOx has garnered widespread attention as a green chemical approach due to its advantages of being environmentally friendly,low-carbon,and straightforward.C—N bonds are widely present in many value-added chemicals,such as urea,amides,and ***,traditional methods for constructing C—N bonds typically involve thermochemical ***,using electrochemical methods to catalyze the reduction of CO_(2)and NOx for C—N bond formation has emerged as a green and sustainable *** paper summarizes the research progress of electrochemical C—N bond construction involving CO_(2)and NOx from the perspectives of reaction mechanisms and catalytic system construction,reviews the electrochemical synthesis of urea,amines,amides,and oximes through electrochemical C—N bond construction,and finally analyzes the current problems and challenges in the field,providing prospects for its future development.

关键词： CO_(2)reduction NOx reduction C-N coupling Electrocatalysis

Singlet oxygen-dominated peroxymonosulfate activation by layered crednerite for organic pollutants degradation in high salinity wastewater

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Journal of Environmental Sciences 2024年第1期135卷 86-96页

作者： Chengji sui Zixuan Nie Huan Liu Grzegorz Boczkaj Weizhen Liu Lingshuai Kong Jinhua Zhan Key Laboratory for Colloid&Interface Chemistry of Education Ministry Department of ChemistryShandong UniversityJinan 250100China School of Environment and Energy Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and RecyclingSouth China University of TechnologyGuangzhou 510006China Gdansk University of Technology Faculty of Civil and Environmental EngineeringDepartment of Sanitary EngineeringG.Narutowicza St.11/1280-233 GdanskPoland EkoTech Center Gdansk University of TechnologyG.Narutowicza St.11/1280-233 GdanskPoland

Advanced oxidation processes have been widely studied for organic pollutants treatment in water,but the degradation performance of radical-dominated pathway was severely inhibited by the side reactions between the anions and radicals,especially in high salinity ***,a singlet oxygen(^(1)O_(2))-dominated non-radical process was developed for organic pollutants degradation in high salinity wastewater,with layered crednerite(CuMnO_(2))as catalysts and peroxymonosulfate(pMS)as *** on the experiments and density functional theory calculations,^(1)O_(2)was the dominating reactive species and the constructed Cu-O-Mn with electron-deficient Mn captured electron from pMS promoting the generation of^(1)O_(2).The rapid degradation of bisphenol A(BpA)was achieved by CuMnO_(2)/pMS system,which was 5-fold and 21-fold higher than that in Mn_(2)O_(3)/pMS system and Cu_(2)O/pMS *** CuMnO_(2)/pMS system shown prominent BpA removal performance under high salinity conditions,prominent pMS utilization efficiency,outstanding total organic carbon removal rate,wide range of applicable pH and good *** work unveiled that the^(1)O_(2)-dominated non-radical process of CuMnO_(2)/pMS system overcame the inhibitory effect of anions in high salinity conditions,which provided a promising technique to remove organic pollutants from high saline wastewater.

关键词： Singlet oxygen Non-radical process High salinity Mixed metal oxides Wastewater treatment

A harmonic-wave bio-thermal method for continuous monitoring skin thermal conductivity and capillary perfusion rate

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Nano Research 2024年第5期17卷 4420-4427页

作者： Yuxin Ouyang Jie Lin Jiajing pei Rui sui Di Liu Yanhui Feng Lin Qiu School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Department of Chemistry Tsinghua UniversityBeijing 100084China Institute of Analysis and Testing Beijing Academy of Science and TechnologyBeijing 100089China

The revelation of thermal energy exchange mechanism of human body is challenging yet worthwhile,because it can clearly explain the changes in human symptoms and health ***,the heat transfer of the skin is significant because the skin is the foremost organ for the energy exchange between the human body and the *** order to diagnose the physiological conditions of human skin without causing any damage,it is necessary to use a non-invasive measurement technique by means of a conformal flexible *** harmonic method can minimize the thermal-induced injury to the skin due to its low heat generating properties.A novel type of computational theory assessing skin thermal conductivity,blood perfusion rate of capillaries in the dermis,and superficial subcutaneous tissues was formed by combining the multi-medium thermal diffusion model and the bio-thermal model(pennes equation).The skins of the hand back of six healthy subjects were *** was found that the results revealed no consistent changes in thermal conductivity were observed across genders and *** measured blood perfusion rates were within the range of human capillary *** was found that female subjects had a higher perfusion rate range(0.0058-0.0061 s^(-1))than male subjects(0.0032-0.0049 s^(-1)),which is consistent with invasive medical studies about the gender difference in blood flow rates and stimulated effects in relaxation situations.

关键词： thermal conductivity blood perfusion rate harmonic method pennes equation

Halotolerant Bacillus *** RA coordinates myo-inositol metabolism to confer salt tolerance to tomato

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Journal of Integrative plant Biology 2024年第9期66卷 1871-1885页

作者： Fenghui Wu Zengting Chen Xiaotong Xu Xin Xue Yanling Zhang Na sui Shandong provincial Key Laboratory of plant Stress College of Life SciencesShandong Normal UniversityJinan 250014China Dongying Key Laboratory of Salt Tolerance Mechanism and Application of Halophytes Dongying InstituteShandong Normal UniversityNo.2 Kangyang RoadDongying 257000China

Soil salinity is a worldwide problem threatening crop *** plant growth-promoting rhizobacteria(pGpR)could survive in high salt environment and assist plant adaptation to ***,the genomic and metabolic features,as well as the regulatory mechanisms promoting salt tolerance in plants by these bacteria remain largely *** the current work,a novel halotolerant pGpR strain,namely,Bacillus *** RA can enhance tomato tolerance to salt *** genomic analysis of strain RA with its closely related species indicated a high level of evolutionary plasticity exhibited by strain-specific genes and evolutionary constraints driven by purifying selection,which facilitated its genomic adaptation to salt-affected *** transcriptome further showed that strain RA could tolerate salt stress by balancing energy metabolism via the reprogramming of biosynthetic *** exude a plethora of metabolites that can strongly influence plant *** accumulation of myo-inositol in leaves under salt stress was observed,leading to the promotion of plant growth triggered by Bacillus *** ***,myo-inositol serves as a selective force in the assembly of the phyllosphere microbiome and the recruitment of plant-beneficial *** promotes destabilizing properties in phyllosphere bacterial co-occurrence networks,but not in fungal ***,interdomain interactions between bacteria and fungi were strengthened by myo-inositol in response to salt *** work highlights the genetic adaptation of RA to salt-affected soils and its ability to impact phyllosphere microorganisms through the adjustment of myo-inositol metabolites,thereby imparting enduring resistance against salt stress in tomato.

关键词： myo‐inositol pGpR phyllosphere microorganisms salt stress tomato

Vibration-assisted material damage mechanism:From indentation cracks to scratch cracks

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Chinese Journal of Aeronautics 2024年第8期37卷 527-546页

作者： Bingrui LV Bin LIN Tianyi sui Chunyan LIU Jinshuo ZHAng Longfei WAng Xuhui CHEN Jingguo ZHOU Key Laboratory of Advanced Ceramics and Machining Technology Ministry of EducationTianjin UniversityTianjin 300072China Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education Tianjin UniversityTianjin 300072China Science and Technology of Advanced Functional Composite Laboratory Aerospace Research Institute of Materials and Processing TechnologyBeijing 100076China

Vibration-assisted grinding is one of the most promising technologies for manufacturing optical components due to its efficiency and quality ***,the damage and crack propagation mechanisms of materials in vibration-assisted grinding are not well *** order to elucidate the mechanism of abrasive scratching during vibration-assisted grinding,a kinematic model of vibration scratching was *** influence of process parameters on the evolution of vibration scratches to indentation or straight scratches is revealed by displacement metrics and velocity ***,scratch and vibration scratch experiments were performed on quartz glass,and the results showed that the vibration scratch cracks are a combination of indentation cracks and scratch *** scratch cracks change from indentation cracks to scratch cracks as the indenter moves from the entrance to the exit of the workpiece or as the vibration frequency changes from high to low.A vertical vibration scratch stress field model is established for the first time,which reveals that the maximum principal stress and tensile stress distribution is the fundamental cause for inducing the transformation of the vibration scratch cracking *** model provides a theoretical basis for understanding of the mechanism of material damage and crack propagation during vibration-assisted grinding.

关键词： Vibration assisted grinding Indentation Vibration scratch Material removal mechanism Stress field model Crack propagation mechanism

New Insights into Microplastic Contamination in Different Types of Leachates: Abundances, Characteristics, and potential Sources

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Engineering 2024年第6期37卷 62-68页

作者： Lei Zhang Wentao Zhao Liang Zhang Zhenxiao Cai Ruiqi Yan Xia Yu Damià Barceló Qian sui State Environmental protection Key Laboratory of Environmental Risk Assessment and Control on Chemical process School of Resources and Environmental EngineeringEast China University of Science and TechnologyShanghai 200237China State Key Laboratory of pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of pollution Control and Ecological Security Shanghai 200092China perkinElmer Inc.Shanghai 201203China Maihai Environmental protection Technology Co. Ltd.SuzhouJiangsu 215000China Department of Environmental Chemistry Institute of Environmental Assessment and Water ResearchSpanish Council for Scientific Research(IDAEA-CSIC)Barcelona 08034Spain

Municipal solid waste(MSW)is an important destination for abandoned *** the waste disposal process,large plastic debris is broken down into microplastics(Mps)and released into the ***,current research only focuses on landfill leachates,and the occurrence of Mps in other leachates has not been ***,herein,the abundance and characteristics of Mps in three types of leachates,namely,landfill leachate,residual waste leachate,and household food waste leachate,were studied,all leachates were collected from the largest waste disposal center in *** results showed that the average Mp abundances in the different types of leachates ranged from(129±54)to(1288±184)Mp particles per liter(particlesL1)and the household food waste leachate exhibited the highest Mp abundance(ppolyethylene(pE)and fragments were the dominant polymer type and shape in Mps,*** characteristic polymer types of Mps in individual leachates were ***,the conditional fragmentation model indicated that the landfilling process considerably affected the size distribution of Mps in leachates,leading to a higher percentage(>80%)of small Mps(20–100 lm)in landfill leachates compared to other *** the best of our knowledge,this is the first study discussing the sources of Mps in different leachates,which is important for Mp pollution control during MSW disposal.

关键词： Microplastics Landfill leachate Residual waste leachate Household food waste leachate Source

Azobenzene-based ultrathin peptoid nanoribbons for the potential on highly efficient artificial light-harvesting

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Science China Chemistry 2024年第5期67卷 1680-1686页

作者： Zichao Sun Lingrong Zhu Jingze Liu Fan Liu p.ngchao Wu p.ngliang sui Haibao Jin Shaoliang Lin Shanghai Key Laboratory of Advance polymeric Materials Frontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China

The development of artificial light-harvesting systems based on long-range ordered ultrathin organic nanomaterials(i.e., below3 nm), which were assembled from stimuli-responsive sequence-controlled biomimetic polymers, remains challenging. Herein,we report the self-assembly of azobenzene-containing amphiphilic ternary alternating peptoids to construct photo-responsive ultrathin peptoids nanoribbons(UTpNRs) with a thickness of ~2.3 nm and the length in several micrometers. The pendants hydrophobic conjugate stacking mechanism explained the formation of one-dimensional ultrathin nanostructures, whose thickness was highly dependent on the length of side groups. The photo-isomerization of azobenzene moiety endowed the aggregates with a reversible morphology transformation from UTpNRs to spherical micelles(46.5 nm), upon the alternative irradiation with ultraviolet and visible light. Donor of 4-(2-hydroxyethylamino)-7-nitro-2,1,3-benzoxadiazole(NBD) and acceptor of rhodamine B(RB) were introduced onto the hydrophobic and hydrophilic regions, respectively, to generate photocontrollable artificial light-harvesting systems. Compared with the spheres-based systems, the obtained NBD-UTpNRs@RB composite proved a higher energy transfer efficiency(90.6%) and a lower requirement of RB acceptors in water. A proof-ofconcept use as fluorescent writable ink demonstrated the potential of UTpNRs on information encryption.

关键词： azobenzene-based peptoid ultrathin nanoribbon photo-responsive light-harvesting information encryption

Effect of Ball Milling Time on Microstructure and Hydrogen Storage properties of Nd_(5)Mg_(41)Ni Alloy

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Acta Metallurgica Sinica(English Letters) 2024年第7期37卷 1201-1214页

作者： Zeming Yuan Chenxu Liu Xiaoming Li Yongqi sui Zhonggang Han Tingting Zhai Dianchen Feng Yanghuan Zhang Instrumental Analysis Center Inner Mongolia University of Science and TechnologyBaotou014010China Department of Functional Material Research Central Iron and Steel Research InstituteBeijing100081China

Mg-based alloys must be dehydrogenated at high pressure and temperatures, limiting their practical application. In this paper, Nd_(5)Mg_(41)Ni alloy was prepared by vacuum melting, and the as-cast alloy was ball milled for 5 h, 10 h, 15 h, and 20 h. The effect of ball milling time on the microstructure and hydrogen storage properties of the alloy was systematically studied. The alloy comprises Nd_(5)Mg_(41), NdMg_(12), NdMg_(3), and Mg_(2)Ni phases. The Nd_(5)Mg_(41)Ni alloy milling for 10 h can reach 95% of the saturated hydrogen absorption at 553 K by 40 s, and the alloy can desorb hydrogen only by 20 min. The dehydrogenation activation energy is only 99.9 kJ/mol H_(2). Ball milling makes the alloy produce many nanocrystalline and amorphous structures. The nano-grain boundary provides a channel for the diffusion of hydrogen atoms, and the high energy at the grain boundary provides energy for the phase deformation nucleus. Ball milling leads to the refinement of alloy particles and shortens the diffusion distance of hydrogen atoms to the interior of alloy particles. Defects such as twins and dislocations generated by milling provide energy for the phase deformation nucleus during the hydrogen absorption and desorption.

关键词： Hydrogen storage materials Magnesium-base alloy Ball milling Nanocrystal Kinetics