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Utilizing a metal-forging inspired chain combing strategy to enhance properties and expand applications of Nylon 66 plastic via heat inducing

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Nano Research 2024年第3期17卷 2164-2171页

作者： Junyu Yang jiangwei zhang Nan Wang Guangyuan Zhou Division of Energy Materials Daglian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Innovation Center of Energy Material and Chemistry College of Chemistry and Chemical EngineeringInner Mongolia UniversityHohhot 010021China

The mechanical properties of engineering plastics can be enhanced through effective surface mechanical treatment(SMT),which can be applied to various types of engineering plastics,eliminating the limitations of conventional polymer processing and could potentially extend their applications and improve their performance and reliability as structural-functional *** by metal forging,this work proposes a simple and effective SMT strategy to enhance the mechanical properties of polyamide 66(PA66).Tensile tests have shown that SMTed PA66 samples exhibit significant improvements in both Young’s modulus and ultimate tensile strength(UTS),with a 2104 MPa Young’s modulus,almost double that of the pristine samples,and a 35.56%increase in UTS,reaching 183 ***,the modulus within the localized SMTed surface layer could reach up to 14 GPa,which is approximately 14 times higher than that of the pristine *** Vickers hardness within the localized SMTed surface layer can be doubled,reaching 10.72 Hv,and the crystallinity can increase by approximately 20%compared to the untreated ***,force field molecular dynamics(FFMD)simulations were conducted to investigate the ternary relationship between the SMT method,PA66’s molecular structure,and its *** combination of MD simulations and versatile structural characterizations provides evidence that the SMT method’s mechanism,under heat induction,results in a chain-combing procedure that changes the polymer’s molecular morphology microscopically and enhances its mechanical properties macroscopically.

关键词： Nylon 66 mechanical properties hardness crystallinity structural characterizations molecular dynamics simulation

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Four-birds-with-one-stone:A multifunctional Ti-based material for solar-driven water evaporation

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Nano Research 2024年第5期17卷 4498-4506页

作者： Yannan Li Yaning Sun Dan zhang Yu Xue Jie Wang Nan zhang Jun Wang jiangwei zhang Yan Zhao Jun-Jie Liu School of Physical Science and Technology College of Energy Materials and ChemistryInner Mongolia UniversityHohhot 010021China

Sustainable,environmentally friendly and low-energy desalination materials have important research value for the increasing demand of freshwater year by ***,it is a huge challenge to maintain high heat energy transfer efficiency without reducing the heat conversion capacity of specific solar photothermal conversion ***,their efficiency and durability are greatly limited by the problems of seawater corrosion,oil,and bacteria *** now,no related work has been reported to solve all the aforementioned problems via a simple four-birds-with-one-stone ***,a class of multifunctional porous photothermal silver(Ag)modified Ti foams(Tf-TA/Ag series materials)is prepared for the development of advanced solar water evaporation devices,and provides alternative materials for alleviating freshwater crisis and treating *** oil contact angle(OCA)changes from 41°to 180°,which significantly reduces the adhesion of *** addition,Tf-TA2/Ag sample also shows an excellent and sustained antibacterial effect,which maintains above 99.9%of antibacterial rate after repeated 5 *** surface temperature of the Tf-TA2/Ag sample reaches 52.5℃ after simulated sun irradiation for 20 min,which is significantly higher than that of the contact groups(water:36.4℃,Ti foam:38.2℃ and Tf-TA2:40.9℃).The capacity of seawater evaporation and salt removal is enhanced due to the excellent photothermal properties,low reflectance,and uniform heat dissipation *** water production efficiency of Tf-TA2/Ag sample is 1.41 kg·m^(-2)·h^(-1) in artificial seawater and 0.76 kg·m^(-2)·h^(-1) in oily sewage under simulated sun ***,the hydrophilic and oleophobic properties of Tf-TA2/Ag are critical to extracting water from oil/water mixture in diverse water ***,this four-birds-with-one-stone approach provides a new perspective for the improvement of solar seawater desalination performance.

关键词： four-birds-with-one-stone photothermal material antibacterial material antifouling property

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液相色谱-串联质谱法测定化妆品中雌二醇的不确定度评定

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化学分析计量 2024年第4期33卷 120-125页

作者：张江维周桓余悦刘小娟广东省药品检验所广州510663

按《化妆品安全技术规范》(2015版)中液相色谱-串联质谱法测定化妆品中雌二醇的含量,因样品检出结果在定量限附近,为确保结果的可靠性,对其检测过程的不确定度进行分析。通过建立数学模型,考察不确定度的来源并进行量化,计算出相对标准... 详细信息

按《化妆品安全技术规范》(2015版)中液相色谱-串联质谱法测定化妆品中雌二醇的含量,因样品检出结果在定量限附近,为确保结果的可靠性,对其检测过程的不确定度进行分析。通过建立数学模型,考察不确定度的来源并进行量化,计算出相对标准不确定度和扩展不确定度。结果表明,测量不确定度的主要来源为标准曲线拟合和仪器引入,当被测样品中雌二醇的质量分数为0.3108μg/g时,其扩展不确定度为0.04846μg/g。该方法对其检验过程进行质量控制、提升检测结果的准确性提供参考。

关键词：液相色谱-串联质谱法化妆品雌二醇不确定度

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肾移植术后血管并发症的诊疗策略

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器官移植 2024年第1期15卷 1-9页

作者：张江伟丁小明西安交通大学第一附属医院肾移植科西安710061

随着肾移植供受者评估标准、器官获取保存方案、手术技术等不断进步,肾移植术后血管并发症的发生率有所下降,但仍是肾移植较为严重的手术并发症之一,可导致移植物丢失及受者死亡,严重影响肾移植效果。因此,本文就肾移植术后常见血管并发... 详细信息

随着肾移植供受者评估标准、器官获取保存方案、手术技术等不断进步,肾移植术后血管并发症的发生率有所下降,但仍是肾移植较为严重的手术并发症之一,可导致移植物丢失及受者死亡,严重影响肾移植效果。因此,本文就肾移植术后常见血管并发症,包括血管狭窄、动脉夹层、假性动脉瘤、血管破裂、血栓等的发生概况、临床表现、诊断和治疗策略进行综述,并结合西安交通大学第一附属医院肾移植术后血管并发症发生和诊治情况,总结肾移植术后常见血管并发症的诊疗策略,以期为肾移植术后血管并发症的临床诊断和治疗提供参考,降低血管并发症的发生率,提高肾移植疗效和受者生存率。

关键词：肾移植血管并发症血管狭窄动脉夹层假性动脉瘤血栓供者来源性感染数字减影血管造影(DSA) 经皮腔内血管成形术

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药物临床试验稽查信息化管理平台的构建与应用

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药学与临床研究 2024年第2期32卷 184-187页

作者：王鸯张旭松张琳宁章江伟刘亚麟正大天晴药业集团股份有限公司南京211100

采用自主研发的报告管理系统(RMS)对稽查工作进行全流程管理,探索信息化管理在临床试验稽查中的应用。RMS以稽查工作流程为设计背景,以稽查报告内容为主体,稽查要点作为框架,设置问题录入端口。RMS多角色同步操作的功能提高了稽查效率;... 详细信息

采用自主研发的报告管理系统(RMS)对稽查工作进行全流程管理,探索信息化管理在临床试验稽查中的应用。RMS以稽查工作流程为设计背景,以稽查报告内容为主体,稽查要点作为框架,设置问题录入端口。RMS多角色同步操作的功能提高了稽查效率;通过预设“条目”+“限定语”词典对问题进行分类分级,提高了报告的可读性和查阅便捷性;使用计算机检索和运算功能,实现了稽查问题的多维度分析,进一步完善了问题上报机制,实现临床试验质量持续改进。在符合稽查工作需求的同时,RMS也对数据的安全、隐私保护、修改轨迹等做出了设定。

关键词：临床试验稽查报告报告管理系统信息化管理

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Sub-2 nm ultra-thin Bi_(2)O_(2)CO_(3)nanosheets with abundant Bi-O structures toward formic acid electrosynthesis over a wide potential window

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Nano Research 2022年第4期15卷 2919-2927页

作者： Yuhong Wang Bin Wang Wenjun Jiang Zailun Liu jiangwei zhang Lizhen Gao Wei Yao Qian Xuesen Laboratory of Space Technology China Academy of Space Technology104 Youyi RoadBeijing 100094China College of Environmental Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Dalian National Laboratory for Clean Energy&State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of Sciences(CAS)Dalian 116023China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences(CAS)Fuzhou 350002China

The electrocatalytic reduction of CO_(2)to HCOOH(ERC-HCOOH)is one of the most feasible ways to alleviate energy crisis and solve environmental ***,it remains a challenge for ERC-HCOOH to maintain excellent activity and selectivity in a wide potential ***,ultra-thin flower-like Bi_(2)O_(2)CO_(3)nanosheets(NSs)with abundant Bi-O structures were in situ synthesized on carbon paper via topological transformation and *** efficiency of HCOOH(FEHCOOH)reached 90%in a wide potential window(-1.5 to-1.8 V ***/AgCl).Significantly,excellent FEHCOOH(90%)and current density(47 mA·cm^(-2))were achieved at-1.8 V ***/*** X-ray absorption fine structure(XAFS)combined with density functional theory(DFT)calculation demonstrated that the excellent performance of Bi_(2)O_(2)CO_(3)NS was attributed to the abundant Bi-O structures,which was conducive to enhancing the adsorption of CO_(2)^(*)and OCHO^(*)intermediates and can effectively inhibit hydrogen *** excellent performance of Bi_(2)O_(2)CO_(3)NS over a wide potential window could provide new insights for the efficient electrocatalytic conversion of CO_(2).

关键词： CO_(2)reduction Bi_(2)O_(2)CO_(3)nanosheets Bi-O structures X-ray absorption fine structure wide potential window

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Simultaneously enhanced interfacial shear strength and tensile strength of heterocyclic aramid fiber by graphene oxide

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Nano Research 2023年第10期16卷 12286-12293页

作者： Ziyi zhang Xiangzheng Jia Chun Li Lanying Li Yeye Wen Zhenfei Gao jiangwei zhang Enlai Gao Kun Jiao Jin zhang College of Science China University of Petroleum(Beijing)Beijing 102249China Beijing National Laboratory for Molecular Sciences School of Materials Science and EngineeringCollege of Chemistry and Molecular EngineeringBeijing Science and Engineering Center for NanocarbonsPeking UniversityBeijing 100871China Beijing Graphene Institute(BGI) Beijing 100095China Department of Engineering Mechanics School of Civil EngineeringWuhan UniversityWuhan 430072China China Bluestar Chengrand Chemical Co. Ltd.Chengdu 610041China Science Center of Energy Material and Chemistry College of Chemistry and Chemical EngineeringInner Mongolia UniversityHohhot 010021China

Heterocyclic aramid fibers,a typical kind of high-performance fibers,have been widely used in aerospace and protection fields because of their excellent mechanical ***,the application of heterocyclic aramid fibers as a reinforcement is hindered by the weak interfacial combination with matrix materials,especially *** strategies enhancing the interfacial shear strength(IFSS)usually decrease the tensile ***,simultaneous enhancement of both mechanical properties remains a ***,we report a novel heterocyclic aramid fiber with high interfacial shear strength(49.3 MPa)and tensile strength(6.27 GPa),in which 4,4′-diamino-2′-chlorobenzanilide(DABA-Cl)and a small amount of graphene oxide(GO)are introduced through in-situ *** bonds andπ–πinteraction between GO and polymer chains trigger the enhancement in crystallinity,orientation,and lateral interaction of the fibers,thus improving the tensile strength and interfacial shear strength of the ***,the interfacial interaction between fiber and epoxy is enhanced due to the improvement of the surface polarity of the fibers caused by ***,a method to improve both tensile strength and interfacial shear strength of heterocyclic aramid fibers was found by introducing GO and DABA-Cl,which may provide guidance for the design and preparation of other high-performance fibers.

关键词： heterocyclic aramid fibers graphene oxide(GO) 4 4′-diamino-2′-chlorobenzanilide(DABA-Cl) interfacial shear strength tensile strength

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Atomically-precise Janus polyoxometalate catalyst with tunable water splitting activity

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Science China Chemistry 2023年第6期66卷 1771-1780页

作者： Zhimin Wang Xing Xin Zheng Li Mo zhang jiangwei zhang Yeqin Feng Junhao zhang Hongjin Lv Guo-Yu Yang MOE Key Laboratory of Cluster Science Beijing Key Laboratory of Photoelectroic/Electrophotonic Conversion MaterialsSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 102488China College of Chemistry and Chemical Engineering Inner Mongolia UniversityHohhot 010021China

The development of bifunctional catalysts for solar-driven hydrogen and oxygen evolution has been regarded as a challenging but interesting research *** promising multi-electron-transfer catalysts,previously reported polyoxometalate(POM)-based catalysts often contain only a single type of transition metal substitution for driving either hydrogen production or oxygen ***,a viable two-step parental substitution approach has been developed to synthesize two structurally-new mixed-transition-metal-substituted polyoxometalates(mixed TMSPs),K_(6)Na_(4)[Mn_(2)Ni_(2)(H_(2)O)2(PW_(9)O_(34))2]·21H_(2)O({Mn_(2)Ni_(2)})and K10[Mn_(2)Co_(2)(H_(2)O)2(PW_(9)O_(34))2]·35H_(2)O({Mn_(2)Co_(2)}),using Na_(12)[Mn_(2)Na_(2)(PW_(9)O_(34))2]·36H_(2)O({Mn_(2)Na_(2)})as the *** results confirmed the nearly quantitative substitution of Na+with Ni_(2)+and Co_(2+)ions.X-ray absorption fine structure(XAFS)spectroscopy revealed that the Mn atoms are preferentially located in the internal positions of the central belt while Ni and Co atoms preferentially reside in the external,solvent-accessible *** from the second substitution of catalytically active transition metals,the resulting{Mn_(2)Ni_(2)}and{Mn_(2)Co_(2)}can be utilized as Janus catalysts towards H_(2) evolution and O_(2) evolution under visible light irradiation with greatly-enhanced activity compared to that of parental{Mn_(2)Na_(2)}.The introduction of mixed transition metals into POM structures not only enriches the POMs family,but also provides an effective strategy to control electronic structures and catalytic properties of POM-based catalysts at the atomic level.

关键词： Janus polyoxometalate catalyst mixed-transition-metal substitution X-ray absorption fine structure(XAFS) H evolution O evolution

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高效液相色谱法测定化妆品中19种非甾体抗炎药

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化学分析计量 2024年第5期33卷 12-18页

作者：张江维张弦谭杰梁柱业关漪莲广东省药品检验所广州510663

建立高效液相色谱法测定化妆品中19种非甾体抗炎药含量。化妆品样品经体积比为1∶1的乙腈-乙酸铵溶液超声提取,用C_(18)色谱柱(250 mm×4.6 mm,5μm)分离,以不同体积比的乙腈-乙酸铵溶液为流动相梯度洗脱,采用二极管阵列检测器检测。布... 详细信息

建立高效液相色谱法测定化妆品中19种非甾体抗炎药含量。化妆品样品经体积比为1∶1的乙腈-乙酸铵溶液超声提取,用C_(18)色谱柱(250 mm×4.6 mm,5μm)分离,以不同体积比的乙腈-乙酸铵溶液为流动相梯度洗脱,采用二极管阵列检测器检测。布洛芬的检测波长为230 nm,醋氯芬酸、双氯芬酸钠检测波长为278 nm,其余16种非甾体的检测波长均为245 nm。19种非甾体的质量浓度在5~200μg/mL范围内与其对应的色谱峰面积线性关系良好,相关系数均大于0.999 5,检出限为0.2~8 mg/kg。空白样品的水剂和凝胶基质的加标平均回收率分别为93.1%~110.9%和91.3%~108.1%,测定结果的相对标准偏差分别为0.2%~3.5%和0.6%~4.2%(n=6)。该方法适用于化妆品中19种非甾体抗炎药的测定。

关键词：高效液相色谱法非甾体抗炎药化妆品

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Spatial confinement of copper single atoms into covalent triazinebased frameworks for highly efficient and selective photocatalytic CO_(2)reduction

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Nano Research 2022年第9期15卷 8001-8009页

作者： Guocheng Huang Qing Niu Yuxin He Jinjin Tian Mingbin Gao Chaoyang Li Ning An Jinhong Bi jiangwei zhang Department of Environmental Science and Engineering Fuzhou UniversityFuzhou 350108China Advanced Chemical Engineering and Energy Materials Research Center China University of Petroleum(East China)Qingdao 266580China State Key Laboratory of Photocatalysis on Energy and Environment Fuzhou UniversityFuzhou 350108China National Engineering Laboratory for Methanol to Olefins Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Anhui Chuangpu Instrument Technology Co. LTD.Hefei 230088China

Converting CO_(2)into carbonaceous fuels via photocatalysis represents an appealing strategy to simultaneously alleviate the energy crisis and associated environmental problems,yet designing with high photoreduction activity catalysts remains a compelling ***,combining the merits of highly porous structure and maximum atomic efficiency,we rationally constructed covalent triazine-based frameworks(CTFs)anchoring copper single atoms(Cu-SA/CTF)photocatalysts for efficient CO_(2)*** Cu single atoms were visualized by high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM)images and coordination structure of Cu-N-C2 sites was revealed by extended X-ray absorption fine structure(EXAFS)*** as-prepared Cu-SA/CTF photocatalysts exhibited superior photocatalytic CO_(2)conversion to CH4 performance associated with a high selectivity of 98.31%.Significantly,the introduction of Cu single atoms endowed the CuSA/CTF catalysts with increased CO_(2)adsorption capacity,strengthened visible light responsive ability,and improved the photogenerated carriers separation efficiency,thus enhancing the photocatalytic *** work provides useful guidelines for designing robust visible light responsive photoreduction CO_(2)catalysts on the atomic scale.

关键词： covalent triazine-based frameworks Cu single atoms photocatalytic CO_(2)reduction visible light selectivity

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