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Low Viscosity and High Strength Room Temperature Cured Epoxy Structural Adhesive Based on Different Amine Curing Agents

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SSRN 2022年

作者： Bi, Shuguang Xiao, Ming Huang, Liang Rong, Huaqing Jia, Liping Ran, Jianhua Quan, Heng Zhang, Liying Tang, Jiagong Hubei Key Laboratory of Biomass Fibers and Eco-Dyeing & Finishing State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University Wuhan430200 China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Center for Civil Aviation Composites Donghua University Shanghai201620 China Wuhan Rongshengjimei Technology Co. LTD Wuhan430058 China

Epoxy resin has been widely used in the field of bonding owing to its low shrinkage and high adhesive performance, especially room temperature cured epoxy resin has been paid more and more attention in the field of construction engineering. However, it is still a great challenge to ensure that the epoxy adhesive with low viscosity has a high mechanical strength during rapid curing at room temperature in some construction engineering fields, such as filling repair, bonding steel reinforcement, etc. In this work, low viscosity and high strength room temperature cured epoxy structural adhesives were fabricated by using 1,4-butanediol diglycidyl ether (BDE) with difunctional groups as active diluent to reduce the viscosity of bisphenol F epoxy resin (BPF-170) and four kinds of amines, namely 2,4,6-Tris(dimethylamiomethyl)phenol (TAP), Triethylenetetramine (TETA), N-Aminoethylpiperazine (AEP) and Isophorondiamine (IPDA) as curing agents at room temperature, following by the investigation of the effects of the four different chemical structures of curing agents on the gelation time and mechanical properties of epoxy structural adhesive. Among the four kinds of epoxy structural adhesives, the BPF-170/BDE/IPDA system using alicyclic amine has the lowest viscosity of 77 mPa·s and the longest gelation time of 95.9 min. Furthermore, the BPF-170/BDE/AEP system using piperazine amine has the best mechanical properties with the shear strength, tensile strength, compressive strength and impact strength of 23 MPa, 62.5 MPa, 112.9 MPa and 2.82 kJ/m2, respectively. In addition, the four epoxy structural adhesives have great thermal stability. The initial decomposition temperatures are all above 280 ℃ and the maximum decomposition temperatures are all above 360 ℃. These four epoxy structural adhesives with low viscosity and high strength have significant application value in the fields of construction engineering, joint filling and potting repairing, etc. © 2022, The Authors. All righ

关键词： Amines

Recent advances in the synthesis of nanoscale hierarchically porous metal–organic frameworks

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Nano materials Science 2022年第4期4卷 351-365页

作者： Chongxiong Duan Kuan Liang Zena Zhang Jingjing Li Ting Chen Daofei Lv Libo Li Le Kang Kai Wang Han Hu Hongxia Xi School of Materials Science and Hydrogen Engineering Foshan UniversityFoshan528231China School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou510640China State Key Laboratory of Heavy Oil Processing College of Chemical EngineeringInstitute of New EnergyChina University of Petroleum(East China)Qingdao266580China School of Materials Science and Engineering Xi'an University of Science and TechnologyXi'an710054China School of Electrical Engineering Qingdao UniversityQingdao266061China

Nanoscale hierarchically porous metal–organic frameworks(NHP-MOFs)have received unprecedented attention in many fields owing to their integration of the strengths of nanoscale size(<1μm)and hierarchical porous structure(micro-,meso-and/or macro-pores)of *** review focuses on recent advances in the main synthetic strategies for NHP-MOFs based on different metal ions(e.g.,Cu,Fe,Co,Zn,Al,Zr,and Cr),including the template method,composite technology,post-synthetic modification,in situ growth and the grind *** addition,the mechanisms of synthesis,regulation techniques and the advantages and disadvantages of various methods are ***,the challenges and prospects of the commercialisation of promising NHP-MOFs are also *** purpose of this review is to provide a road map for future design and development of NHP-MOFs for practical application.

关键词： Metal–organic frameworks Nanoscale Hierarchically porous structure Synthesis strategies

Biopolymer passivation for high-performance perovskite solar cells by blade coating

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Journal of Energy Chemistry 2021年第3期30卷 45-52页

作者： Shudi Qiu Xin Xu Linxiang Zeng Zhen Wang Yijun Chen Culling Zhang Chaohui Li Jinlong Hu Tingting Shi Yaohua Mai Fei Guo Institute of New Energy Technology College of Information Science and TechnologyJinan UniversityGuangzhou 510632GuangdongChina Siyuan Laboratory Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials Department of Physics Jinan UniversityGuangzhou 510632GuangdongChina College of Chemistry Environmental Engineering Datong University.Datong 037009ShanxiChina National Engineering Research Center for Advanced Polymer Processing Technology Zhengzhou UniversityZhengzhou 450002HenanChina

Thin films of perovskite deposited from solution inevitably introduce large number of defects,which serve as recombination centers and are detrimental for solar cell *** many small molecules and polymers have been delicately designed to migrate defects of perovskite films,exploiting credible passivation agents based on natural materials would offer an alternative ***,an ecofriendly and cost-effective biomaterial,ploy-L-lysine(PLL),is identified to effectively passivate the defects of perovskite films prepared by *** is found that incorporation of a small amount(2.5 mg mL^(-1))of PLL significantly boosts the performance of printed devices,yielding a high efficiency of 19.45% with an increase in open-circuit voltage by up to 100 *** functional theory calculations combined with X-ray photoelectron spectroscopy reveal that the functional groups(-NH2,-COOH)of PLL effectively migrate the Pb-I antisite defects via Pb-N coordination and suppress the formation of metallic Pb in the blade-coated perovskite *** work suggests a viable avenue to exploit passivation agents from natural materials for preparation of high-quality perovskite layers for optoelectronic applications.

关键词： Perovskite solar cells Blade coating Biopolymer passivation Density functional theory

Synergistic Effect of Pore Confinement and Catalysis for Ultra-Stable Potassium-Selenium Batteries

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SSRN 2025年

作者： Liang, Shuaitong Li, Yuenan Miao, Junping Liu, Shuoshuo Han, Pengju Li, Xiang Shao, Weili He, Jianxin Xu, Zhiwei International Joint Laboratory of New Textile Materials and Textiles of Henan Province Zhongyuan University of Technology Zhengzhou450007 China State Key Laboratory of Separation Membranes and Membrane Processes School of Textiles Science and Engineering Tiangong University Tianjin300387 China

Porous carbon fiber substrates play a pivotal role in enhancing the performance of potassium-selenium (K-Se) battery, as they are key to efficiently confining small Se molecules and regulating selenide reactions. Herein, to address the issues of volumetric expansion and polyselenide formation caused by disordered Se aggregation, a three-dimensional composite material of microporous carbon nanofibers coated with Se and Fe was synthesized, effectively suppressing the shuttle effect of liquid-phase polyselenides. state-of-the-art analytical techniques and theoretical modeling were employed to elucidate the deposition dynamics of Se molecules within micropores and the mitigation mechanisms for volumetric expansion effects. The pore-confinement effect optimizes the spatial distribution of Se, while Fe catalyzed the K2Sex, effectively mitigating the sluggish reaction kinetics associated with K2Sex formation. This study offers a theoretical framework and experimental insights to advance the development of K-Se battery with high energy density and superior cycling stability. © 2025, The Authors. All rights reserved.

关键词： Micropores

All Green Solvent Engineering of Organic-Inorganic Hybrid Perovskite Layer for High-Performance Solar Cells

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SSRN 2022年

作者： Wei, Jinquan Cao, Xiaobing Hao, Lei Liu, Zijin Su, Gengyang He, Xin Zeng, Qingguang School of Applied Physics and Materials Wuyi University Jiangmen529020 China School of Textile Materials and Engineering Wuyi University Jiangmen529020 China State Key Lab of New Ceramics and Fine Processing Education Ministry Key Laboratory for Advanced Materials Processing Technology School of Materials Science and Engineering Tsinghua University Beijing100084 China

Solvent engineering technology is an important approach for fabrication of high quality perovskite films, and thereby high-performance perovskite solar cells (PSCs). However, it is strongly dependent on the usage of toxic solvents, including the host solvent and anti-solvent to prepare perovskite solutions and control the crystallization of perovskite films, respectively. The usage of toxic solvents poses a serious threat to the health of manufactures and the safety of environment. Therefore, the solvent toxicity has become a burning issue before the forthcoming commercialization of PSCs. Here, we report an all green solvent engineering to prepare high quality (FAPbI3)1-x(MAPbBr3)x (x=0, 0.05) films, where a green Lewis base solvent of triethyl phosphate (TEP) is used to prepare (FAPbI3)1-x(MAPbBr3)x/TEP solution, and a non-polar solvent of dibutyl ether (DEE) is used as anti-solvent. In this approach, a new intermediate phase film is formed after spin-coating the (FAPbI3)1-x(MAPbBr3)x/TEP solution on substrates, followed by dropping of DEE during spinning, and subsequently convert into perovskite films by annealing. Finally, it enables a PCE of 18.65% (x=0) and 20.13% (x=0.05) basing on a typical device configuration of FTO/SnO2/Perovskite/Spiro-OMeTAD/Au, which is the highest value for the all green solvent processed PSCs. More importantly, the all green solvent engineering approach can also be used to prepare another typical perovskite of MAPbI3 films for efficient solar cells. Therefore, this work not only provides an universial approach to prepare typical organic-inorganic hybrid perovskite films, but also addresses the solvent toxicity during the production of perovskite films. The green solvent engineering may pave the way for future industrial scale production of PSCs under environment friendly conditions. © 2022, The Authors. All rights reserved.

关键词： Perovskite solar cells

Unraveling Photothermal-Enhanced Bulk Charge Transport and Surface Oxygen Reactions in Tio2 Photoanodes for Highly Efficient Photoelectrochemical Water Oxidation

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SSRN 2022年

作者： Liu, Xueqin Huang, Jing Wang, Jingnan Lin, Kaijie He, Bing Hu, Xiaoqin Yang, Yingkui Wang, Yang Li, Zhen State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University Wuhan430200 China Faculty of Materials Science and Chemistry China University of Geosciences Wuhan430074 China Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education Hubei Key Laboratory of Catalysis and Materials Science South-Central University for Nationalities Wuhan430074 China

Titanium dioxide (TiO2) has been extensively used as an important photoanode material for photoelectrochemical (PEC) water splitting, but its activity is greatly hindered by the low charge transport and sluggish oxygen evolution reaction (OER) kinetics. Herein, we demonstrate spinel oxide NiCo2O4 (NCO) acted as both photothermal material and oxygen evolution cocatalyst could significantly promote the PEC performance of TiO2 photoanodes, and a high photocurrent of 2.34 mA cm-2 at 1.23 V vs. reversible hydrogen electrode has been achieved by NCO/TiO2 photoanodes assisted by photothermal effect. Importantly, a mechanism is proposed to explain the enhanced bulk charge transport and surface OER activity by an integrated various operando characterizations and density functional theory (DFT) study. Intensity modulated photocurrent spectroscopy (IMPS) analysis and DFT calculations imply the relatively high temperature induced by photothermal effect could accelerate small polaron hopping in the bulk of TiO2, which is verified by the electron diffusion coefficient variation of TiO2 with oxygen vacancies at different temperature. Operando cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) reveal that photothermal conversion facilitates the oxidation of Ni2+ at lower potential and promotes the adsorption of *OH and deprotonation of *OOH intermediates. This work provides deep insight into the photothermal-enhanced PEC performance by observing the bulk small polaron hopping and surface dynamic evolution during the PEC process, which may underpin future advances in promoting PEC and photocatalytic performances of small-polaron-type semiconductors. © 2022, The Authors. All rights reserved.

关键词： Charge transfer

One-Pot Eutectic Molten Salt Synthesis of Mxene-Supported Nanoscale Zero-Valent Iron Composites for Efficient Adsorption and Reduction of Uranium

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SSRN 2024年

作者： Tu, HaoWei Wu, YanZe Li, ZiJie Zhang, PengCheng Wei, Cuilian Yuan, LiYong Wang, NanNan Wang, Lin Shi, WeiQun State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials School of Resources Environment and Materials Guangxi University Nanning530004 China Laboratory of Nuclear Energy Chemistry Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China

The environmental remediation potential of nanoscale zero-valent iron (nZVI) is generally hindered by severe particle agglomeration or poor stability. A straightforward approach to overcome these challenges is to uniformly and firmly disperse nZVI onto high surface area substrates such as two-dimensional materials. Herein, we propose a novel method for one-pot synthesis of MXene-nZVI composites based on the eutectic molten salt (MS) etching of MAX phase materials. The utilization of ferrous ions with high redox potential in chloride MS enables efficient removal of weakly bonded Al atoms from MAX phases, leading to the formation of MXenes and concomitant in situ reduction of Fe2+ to nZVI on MXene surface. Batch adsorption experiments showed that the effective synergy between nano-lamellar MXene and nZVI played a pivotal role in boosting U(VI) elimination performance of the composites. The optimized MS-MXene-nZVI could rapidly and completely eliminate 291 mg/L U(VI) at an adsorbent dosage of 0.2 g/L, and the maximum removal capacity reached 1750 mg/g. Further environmental application assessment indicated an excellent potential of MS-MXene-nZVI for U(VI) sequestration from complex acid mine drainage. advanced spectroscopic analyses provided clear evidence of the conversion of Fe0 to structural Fe2+ during the reaction and established that the removal mechanism of U(VI) was primarily reductive immobilization, concomitantly with surface chemisorption and hydrolysis precipitation. This study offers new insights into the green and facile preparation of MXene-based nZVI composites via MS strategy, as well as their environmental remediation application in the highly efficient separation of radionuclides and other contaminants. © 2024, The Authors. All rights reserved.

关键词： Spectroscopic analysis

核壳结构LaOCl/LaFeO_(3)纳米纤维的阻抗匹配设计及其电磁吸波性能研究

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Science China materials 2023年第4期66卷 1587-1596页

作者：邢岩范艺存严智凯赵彪黄语嘉潘伟 School of Science Nanjing University of Posts&TelecommunicationsNanjing 210023China Henan Key Laboratory of Aeronautical Materials and Application Technology School of Material Science and EngineeringZhengzhou University of AeronauticsZhengzhou 450046China School of Microelectronics Fudan UniversityShanghai 200433China School of Materials Science and Hydrogen Energy Foshan UniversityFoshan 528000China State Key Laboratory of New Ceramic and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

电磁波在无线通信等领域的广泛应用导致了严重的电磁污染,迫切需要研发高性能电磁波吸收材料.本文针对吸波材料阻抗不匹配等关键问题,设计并成功制备了新型核壳LaOCl/LaFeO_(3)纳米纤维电磁波吸收剂.这种独特的一维多级结构由导电LaFeO_... 详细信息

电磁波在无线通信等领域的广泛应用导致了严重的电磁污染,迫切需要研发高性能电磁波吸收材料.本文针对吸波材料阻抗不匹配等关键问题,设计并成功制备了新型核壳LaOCl/LaFeO_(3)纳米纤维电磁波吸收剂.这种独特的一维多级结构由导电LaFeO_(3)磁性壳层和离子化合物LaOCl核层组成.基于介电-磁损耗耦合和阻抗匹配的协同作用,LaOCl/LaFeO_(3)纳米纤维在超低负载条件下(4 w t%),表现出-40.1 d B(2.0 mm)的反射损耗和6.4 GHz(2.4 mm)的有效吸收带宽.该工作提出了一种新型LaOCl/LaFeO_(3)纳米纤维吸波材料,并为阻抗匹配调控和电磁吸波性能优化开辟了新策略.

关键词：阻抗不匹配无线通信反射损耗阻抗匹配离子化合物吸波材料电磁污染负载条件

Copper-based nanocatalysts toward chemoselective hydrogenation reaction

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cMat 2024年第1期1卷 1-9页

作者： Hui Guo Ling-Jun Pei Shao-Lei Xie Meng-Qi Shen Yong Yang Hu Liu Key Laboratory of Green and High-End Utilization of Salt Lake Resources Qinghai Institute of Salt LakesChinese Academy of SciencesXiningChina School of Chemistry and Chemical Engineering Xi'an University of Architecture and TechnologyXi'anChina Lenfest Center for Sustainable Energy Columbia UniversityNew YorkNew YorkUSA State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi'anShaanxiChina

Cu-based catalysts are widely used in various heterogeneous catalytic reaction systems,the precise control of their electronic structure is an intrinsic require-ment for the rational design of metal catalysts,and it is also an important basis for clarifying their structure-activity *** the electronic structure of Cu-based catalysts is an important way to improve the catalytic hydrogenation performance of Cu-based catalysts by controlling the adsorption intensity be-tween the reaction adsorbate and the active *** this paper,the application of selective hydrogenation of Cu-based catalysts is reviewed,with a special emphasis on the selective catalytic hydrogenation reduction of p-nitrostyrene and CO_(2).This review particularly emphasizes the application of Cu-based catalysts in the field of selective hydrogenation and discusses the influence of their different properties on selective hydrogenation performance.

关键词： copper nanocatalysts nitro compounds selective hydrogenation