检索结果-南通市图书馆

Molecular Dynamics Simulation Studies on the Micromorphology and Proton Transport of Nafion/Ti_(3)C_(2)T_(x) Composite Membrane

引用

Chinese Journal of Polymer Science 2024年第3期42卷 373-387,I0009页

作者： Zhi-Yue Han Su-Peng Pei Chun-Yang Yu yong-feng zhou School of Chemical and Environmental Engineering Shanghai Institute of TechnologyShanghai 201418China School of Chemistry&Chemical Engineering Frontiers Science Center for Transformative MoleculesShanghai Key Laboratory of Electrical Insulation and Thermal AgingShanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of Green and High-end Utilization of Salt Lake Resources Chinese Academy of SciencesXining 810008China

The perfluorosulfonic acid(PFSA) membrane doped with two-dimensional conductive filler Ti_(3)C_(2)T_(x) is a fuel cell proton exchange membrane with high application potential. Experimental studies showed that the proton conductivity of Nafion/Ti_(3)C_(2)T_(x) composite membrane is improved significantly compared with that in pure Nafion. However, the microscopic mechanism of doping on the enhancement of membrane performance is remain unclear now. In this work, molecular dynamics simulation was used to investigate the microscopic morphology and proton transport behaviors of Nafion/Ti_(3)C_(2)T_(x) composite membrane at the molecular level. The results shown that there were significant differences about the diffusion kinetics of water molecules and hydroxium ions in Nafion/Ti_(3)C_(2)T_(x) at low and high hydration levels in the nanoscale *** the increase of water content, Ti_(3)C_(2)T_(x) in membrane was gradually surrounded by ambient water molecules to form a hydration layer, and forming a relatively continuous proton transport channel between Nafion polymer and Ti_(3)C_(2)T_(x) monomer. The continuous proton transport channel could increase the number of binding sites of proton and thus achieving high proton conductivity and high mobility of water molecules at higher hydration level. The current work can provide a theoretical guidance for designing new type of Nafion composite membranes.

关键词： Nafion/Ti_(3)C_(2)T_(x)composite membrane Proton transport Molecular dynamics simulation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis,Self-assembly and Electrode Application of Mussel-inspired Alternating Copolymers

引用

Chinese Journal of Polymer Science 2018年第8期36卷 897-897,898-904页

作者： Ying-Lin Zhang Chuan-Long Li Tahir Rasheed Ping Huang yong-feng zhou School of Chemistry and Chemical Engineering Shanghai Key Laboratory of Electrical Insulation and Thermal AgeingShanghai Jiao Tong University State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University

We reported the first mussel-inspired alternating copolymer with a high amount of catechol groups （50% molar ratio） through a facile epoxy-amino click reaction between 9,9-bis（4-（2-glycidyloxyethyl）phenyl fluorene （BGEPF） and dopamine （DA）. The obtained copolymers were used to prepare carbon/nitrogen-doped α-Fe2O3 nanoparticles through self-assembly, coordination and calcination, which displayed excellent electrochemical performance as anode materials for Li-ion batteries.

关键词： Alternating copolymer Catechol groups Self-assembly Li-ion batteries

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Polymer Vesicle Sensor through the Self-assembly of Hyperbranched Polymeric Ionic Liquids for the Detection of SO2 Derivatives

引用

Chinese Journal of Polymer Science 2017年第5期35卷 602-610页

作者： Zhi-lin Hou Tong Huang Cai-yun Cai Tahir Resheed 于春阳 yong-feng zhou De-yue Yan School of Chemistry and Chemical Engineering Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing Shanghai Jiao Tong University State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University

This work reports a SO2 derivative-detecting and colorful hyperbranched polymeric ionic liquid （HBPIL） vesicle through aqueous self-assembly. By a simple anion-exchange, we achieved the combination of functional small-molecule probe of acid fuchsin with HBPILs. The obtained HBPIL vesicle displayed ultraviolet absorption at 544 nm, and was used as a novel SO2 derivative sensor with high sensitivity and visualization. Due to the functional ion pairs enriching on the surface, the SO32 detection limit of the HBPILs vesicles was as low as 0.138 gmol/L, which was about 1.5 orders of magnitude lower than that of acid fuchsin.

关键词： SO2 Self-assembly Polymeric ionic liquids Vesicles

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Corrosion resistance of a silane/ceria modified Mg-Al-layered double hydroxide on AA5005 aluminum alloy

引用

Frontiers of Materials Science 2019年第4期13卷 420-430页

作者： Wei WU Fen ZHANG Yu-Chao LI yong-feng zhou Qing-Song YAO Liang SONG Rong-Chang ZENC Sie Chin TJONG Dong-Chu CHEN College of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China School of Materials Science and Engineering Liaocheng UniversityLiaocheng 252059China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China Department of Physics City University of Hong KongTat Chee AvenueHong KongChina School of Materials Science and Energy Engineering Foshan UniversityFoshan 528000China

The present work aimed at assessing the electrochemical behavior and the corrosion inhibition performance of Mg-Al-layered double hydroxide(LDH)coatings modified with methyltrimethoxysilane(MTMS)and cerium nitrate on AA5005 aluminum *** chemical compositions and surface morphologies of the coatings were investigated by XRD,FT-IR and FE-SEM,while their corrosion resistance was evaluated by electrochemical and immersion *** optimum corrosion resistance of the composite coatings was obtained by adding 10^−2 mol·L^−1 cerium *** excess addition of cerium nitrate resulted in a loose structure and poor corrosion resistance of the *** corrosion mechanism of the composite coatings was proposed and discussed.

关键词： aluminum alloy layered double hydroxide polymer coating cerium oxide corrosion resistance

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Expression and Identification of Mutated Osteoprotegerin in Culture Cells and Larvae of Silkworm

引用

Acta Biochimica et Biophysica Sinica 2004年第5期36卷 331-335页

作者： Hai-Long XIAO, yong-feng JIN, and Yao-zhou ZHANG1* Institute of Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou 310029, China College of Life Sciences, Zhejiang University of Science & Technology, Hangzhou 310018, China College of Life Sciences Zhejiang University of Science & TechnologyHangzhou 310018China Institute of Biochemistry College of Life SciencesZhejiang UniversityHangzhou 310029China

The mutated osteoprotegerin (OPG-372) gene was inserted into the baculovirus transfer vector pBacPAK8, and the recombinant plasmid was co-transfected with linearized Bm-BacPAK6 virus DNA into BmN cells, then homologous recombination occurred inside the cells. The recombinant virus BmNPV-OPG- 372 was screened and identified by Southern blotting. The recombinant human OPG-372 was expressed in cultured cells and the larvae of silkworm by inoculation of recombinant virus. The expression products were run on the SDS-PAGE and their immunoreactivities were determined by Western blotting. It was found that a 42 kD recombinant protein was expressed in BmN cells and a 46 kD one in larvae respectively. The bioactivi- ties of the recombinant proteins were determined by hypocalcemic effect assay in the mice. The results showed that the recombinant proteins had a significant hypocalcemic effect on mice sera.

关键词： OPG-372 silkworm baculovirus expression system hypocalcemic effect

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

荧光标记法研究水含量对两亲性超支化共聚物组装体形貌的影响

引用

高分子学报 2017年第2期27卷 274-282页

作者：徐富贵麦亦勇周永丰上海交通大学化学化工学院上海市电气绝缘和热老化重点实验室上海200240

合成了丹磺酰基(DNS)标记的两亲性超支化共聚物,DNS-PEHO-star-PEO.用荧光标记法研究了DNS-PEHO-star-PEO在四氢呋喃(THF)/H2O混合溶剂中不同水含量下的自组装行为.结果表明,水含量对DNS-PEHO-star-PEO形成的组装体形貌影响显著.含水含... 详细信息

合成了丹磺酰基(DNS)标记的两亲性超支化共聚物,DNS-PEHO-star-PEO.用荧光标记法研究了DNS-PEHO-star-PEO在四氢呋喃(THF)/H2O混合溶剂中不同水含量下的自组装行为.结果表明,水含量对DNS-PEHO-star-PEO形成的组装体形貌影响显著.含水含量小于20 vol%时,DNS-PEHO-star-PEO组装成纳米尺寸的球形胶束;随着水含量增加到?75 vol%时,DNS-PEHO-star-PEO组装成"多胶束聚集体";纯水中(水量100 vol%),DNS-PEHO-star-PEO形成微米尺寸的聚合物大囊泡.利用不同形貌聚集体中DNS的荧光发射谱不同的特性,我们绘制了不同聚集体中DNS的荧光最大发射峰波长与水含量的关系图,直观地反映了水含量对DNS-PEHO-star-PEO组装体形貌的影响.

关键词：两亲性超支化共聚物自组装荧光标记水含量形貌转变

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

交替共聚物纳米花的自组装及在单颗粒表面增强拉曼散射检测中的应用

引用

高分子学报 2023年第5期54卷 687-696页

作者：张常旭潘辉周永丰上海交通大学化学化工学院上海200240

纳米花(NFs)具有多级的结构,表现出各种各样的功能和应用,因此受到了广泛的关注.然而,大多数的纳米花都是通过无机化合物合成的,关于有机聚合物纳米花的报道非常有限.本文报道了一种结晶性的交替共聚物P(DHB-a-DDT),它可以通过溶液自组... 详细信息

纳米花(NFs)具有多级的结构,表现出各种各样的功能和应用,因此受到了广泛的关注.然而,大多数的纳米花都是通过无机化合物合成的,关于有机聚合物纳米花的报道非常有限.本文报道了一种结晶性的交替共聚物P(DHB-a-DDT),它可以通过溶液自组装来大量制备聚合物纳米花.纳米花的尺寸可以通过控制聚合物浓度的方法调控,其调控范围为3.3~12.6μm.进一步地,通过聚合物上的硫与银离子的配位然后原位还原,可以制备负载Ag颗粒的纳米花(AgNP-NFs).虽然AgNP-NFs中的Ag含量只有11.9 wt%,但是AgNP-NFs表现出优异的表面增强拉曼散射(SERS)性能,其检测限为1×10^(−8) mo/L,这比从AgNP-NFs上剥离的Ag颗粒低了2个数量级.同时,AgNP-NFs可用于单颗粒SERS检测,这极大地降低了检测成本.这些发现扩展了交替共聚物的自组装行为,丰富了聚合物纳米花的类型和功能.

关键词：纳米花交替共聚物自组装表面增强拉曼散射

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Dative B–N bonds weaven toward two-dimensional purely organic materials for single crystals

引用

Science China Chemistry 2025年第01期 12-14页

作者： Wei-Lei zhou Siwei Wang yong Chen College of Chemistry and Materials Science Inner Mongolia Key Laboratory of Chemistry for Nature Products and Synthesis for Functional Molecules Innovation Team of Optical Functional Molecular Devices Inner Mongolia Minzu University College of Chemistry Nankai University

Molecular topology is one of the important topics to study and understand the relationship between molecular structure and properties [1]. Particularly, two-dimensional (2D) materials with extremely high surface area and ultra-thin morphology have attracted considerable attention due to their unexpected properties in materials and chemistry [2,3].

关键词：

来源：

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

贵金属纳米颗粒杂化囊泡的制备及拉曼增强效果研究

引用

高分子学报 2016年第7期26卷 971-978页

作者：王洁李惠梅倪云洲周永丰颜德岳上海交通大学化学化工学院上海200240

以超支化聚合物囊泡为模板制备了贵金属纳米颗粒表面功能化的杂化囊泡.模板囊泡通过多巴胺修饰的超支化聚醚HSP-DA在水中自组装形成.在碱性条件下,囊泡表面的多巴胺自聚合生成聚多巴胺,实现囊泡的交联.由于聚多巴胺具有强黏附特性,因此... 详细信息

以超支化聚合物囊泡为模板制备了贵金属纳米颗粒表面功能化的杂化囊泡.模板囊泡通过多巴胺修饰的超支化聚醚HSP-DA在水中自组装形成.在碱性条件下,囊泡表面的多巴胺自聚合生成聚多巴胺,实现囊泡的交联.由于聚多巴胺具有强黏附特性,因此可以将HSP-PDA交联囊泡分别与Au纳米溶胶、Ag纳米溶胶直接混合,得到Au纳米颗粒或Ag纳米颗粒功能化的杂化囊泡.分别测定了2种杂化囊泡的拉曼光谱,发现杂化囊泡产生了明显的表面增强的拉曼光谱(SERS)信号,清晰显示了对应于囊泡模板分子的拉曼信号,表明可以通过SERS来原位检测囊泡的组成.Ag纳米颗粒杂化囊泡展示出更高的SERS灵敏度,可进一步作为探针检测水中浓度为10-7mol/L罗丹明6G分子,得到了显著增强的拉曼光谱,证明所制备的Ag纳米颗粒杂化囊泡可用于目标分子的痕量检测.

关键词：金纳米颗粒银纳米颗粒囊泡多巴胺表面增强拉曼光谱

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

光响应“线性-超支化”超分子嵌段共聚物的制备及其对金表面的可逆亲疏水修饰

引用

高分子学报 2014年第10期24卷 1398-1407页

作者：江文峰陈建新吁松瑞周永丰颜德岳上海交通大学化学化工学院上海200240

报道了一类新型的α-ωn型"线性-超支化"超分子嵌段共聚物.分别通过可控阴离子开环多支化聚合方法(ROMBP)和可逆加成-断裂链转移聚合方法(RAFT)合成了含有一个β-环糊精基团的亲水超支化缩水甘油醚(CD-g-HPG)和含有一个偶氮苯基团的疏... 详细信息

报道了一类新型的α-ωn型"线性-超支化"超分子嵌段共聚物.分别通过可控阴离子开环多支化聚合方法(ROMBP)和可逆加成-断裂链转移聚合方法(RAFT)合成了含有一个β-环糊精基团的亲水超支化缩水甘油醚(CD-g-HPG)和含有一个偶氮苯基团的疏水线性聚甲基丙烯酸甲酯(PMMA-AZO).两者可以通过β-环糊精和偶氮苯基团之间的主客体识别作用形成两亲性线性-超支化超分子嵌段共聚物PMMA-b-HPG.由于线性PMMA-AZO残留有RAFT聚合时链转移剂中的三硫代酯结构,超分子聚合物PMMA-b-HPG可以通过三硫代酯与金形成的硫-金键(S-Au)对金表面进行修饰形成自组装单分子层(SAM).修饰后的金表面呈现出光控的可逆亲疏水性能.在紫外光下,由于β-环糊精/偶氮苯之间的主客体识别作用被破坏,亲水的CD-g-HPG从表面脱离,表面变为疏水;在可见光下,如果重新将金片浸泡在CD-g-HPG溶液中,金表面的亲水性可以恢复.

关键词：超分子嵌段共聚物线性-树形主客体相互作用表面修饰亲疏水转变

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：