检索结果-南通市图书馆

Control Aggregation of P3HT in Solution for High Efficiency Doping:Ensuring Structural Order and the Distribution of Dopants

引用

Chinese Journal of Polymer Science 2023年第5期41卷 811-823,I0012页

作者： Duo Liu Jun-hang Li Si-chun Wang Lu Zhang Xin-Yu Liu Qiang Zhang yan-chun han State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China

Molecular doping is one of the most important tools to manipulate the electrical properties of conjugated polymers for application in organic *** polymer crystallinity and distribution position of the dopant crucially determine electrical conductivity of the doped ***,in solution-mixed doping,the interplay between polymer and dopant leads to highly structural disorder of polymer and random arrangement of ***,we propose a strategy to ensure the dopant induced polarons have high charge dissociation and transport by letting the conjugated polymers aggregate in the marginal solvent solution by cooling it from higher temperature to room *** select poly(3-hexylthiophene-2,5-diyl)(P3HT)solution doped by 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane(F4TCNQ)as a model system.P3HT crystallizes in the marginal solvent,such as 1,1,2-trichloroethane(TCE)driven by the favorπ-πinteraction between planar polymer *** dopant F4TCNQ enters the alkyl side chain region not theπ-πstacking region and thus guarantees high crystallinity and theπ-πinteraction of *** distribution of F4TCNQ which away from the polymer backbone to ensure higher charge dissociation and ***,we obtained a high conductivity value of 23 S/cm by doping P3HT with 20%F4TCNQ by using the marginal solvent,which is higher than doping P3HT with a disordered coil conformation in chlorobenzene(CB)of 7 S/cm,which the dopants enter both the alkyl side chain region and theπ-πstacking region.

关键词： Solvent Crystalline Dopant location Doping efficiency Electrical conductivity

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

Increasing the Content of β Phase of Poly(9,9-dioctylfluorene) by Synergistically Controlling Solution Aggregation and Extending Film-forming Time

引用

Chinese Journal of Polymer Science 2019年第7期37卷 664-673页

作者： Ya-Di Liu Qiang Zhang Xin-Hong Yu Jian-Gang Liu yan-chun han State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Science and Technology of China Hefei 230026China

For poly(9,9-dioctylfluorene)(PFO),β phase (coplanar conformation with the intra-chain torsion angle of 165°) has a greater conjugation length and higher degree of order compared to those of α phase, which favors charge carrier transport. However, the highest content of β phase obtained so far is 45%. We propose to increase the content of β phase by promoting the solution aggregation of PFO molecules and extending film-forming time. For this purpose, 1,8-diiodooctane (DIO) is added to PFO o-xylene solution, which enhances the interaction of PFO chains and improves the planarity of PFO backbone, resulting in the formation of ordered aggregation. The aggregates act as nucleation centers to promote the formation of β phase. The content of β phase increases with increasing DIO concentration and reaches a platform of 39% as DIO is more than 4 vol%. Furthermore, the film is kept in a sealed environment with oxylene atmosphere for 3 h, thus the PFO molecules have enough time to diffuse to the crystallization front and achieve disorder-order transition. As a result, the crystallinity of PFO is improved significantly and the content of β phase increases to 52%, reaching the highest value reported so far.

关键词： β Phase Ordered aggregation Film-forming time Disorder-order transition

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

Effects of aggregation of poly(3-hexylthiophene) in solution on uniaxial alignment of nanofibers during zone casting

引用

Chinese Chemical Letters 2013年第1期24卷 23-27页

作者： Xiang Gao Jian-Gang Liu Yue Sun Ru-Bo Xing yan-chun han State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of Sciences Graduate School of the Chinese Academy of Sciences

We report on the effects of aggregation of P3HT with ordered conformation in solution on improving the uniaxial alignment of the P3HT nanofibers by zone casting. Two approaches were employed to change the aggregation of P3HT： P3HT blending with coil insulating polymer and ultrasonic oscillating. The insulator polymer （i.e. PS） which has good solubility in the solution would disturb the aggregation of P3HT to prevent the chains entanglement. The ultrasonic oscillation can further improve the P3HT aggregation with ordered conformation in the solution. As a result, the P3HT nanofibers in the film grew much orientedly by zone casting the ultrasonic oscillating P3HT]PS polymer blends solution than the same solvent P3HT solution without ultrasonic oscillating and blending. The P3HT π-π stacking direction is parallel to the alignment direction of the nanofibers. Meanwhile, the P3HT/PS blend ratio and PS molecular weight have influence on the uniaxial alignment of P3HT nanofibers. Only P3HT/PS is 1：1, the P3HT nanofibers oriented well. The low molecular weight PS can make the P3HT nanofibers orient better than that of the high molecular weight.

关键词： Conjugated polymerZone-castingUniaxial alignmentUltrasonic oscillatingPolymer blends

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

Influence of bifurcation position and length of side chains on the structure of isoindigo-based conjugated polymer thin films

引用

Chinese Chemical Letters 2017年第2期28卷 333-337页

作者： Shuai-Jie Chi Liang Chen Jian-Gang Liu Xin-Hong Yu yan-chun han State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China University of the Chinese Academy of Sciences Beijing 100049 China

We chose a series of isoindigo-based conjugated polymer（ⅡDDT,ⅡDDT-C3 and ⅡDDT-C4） with different length of side chains and bifurcation positions to investigate the relationship between the degree of alignment and the length of side chains and bifurcation *** found that the dichroic ratio was increased from 2.37 to 5.23 when the side chain was longer and the bifurcation position was away from the *** π-π stacking distance was decreased from 3.67 A to 3.61 A when the bifurcation position was away from the backbone because of its smaller hindrance and the d-spacing of the（100）was increased from 20.06 A to 25.21 A when the side chain was *** the polymers were adopted an edge-on orientation with the backbone paralleled with the long axis of *** weak interaction of side-chain in ⅡDDT-C4 was beneficial for the molecules being rearranged in parallel during the contact line receding and the strong n-n interaction could accelerate the interchain assembly of the parallel molecules through π-π interaction to form aligned fibers.

关键词： Isoindigo-based conjugated polymers Alignment The length of side chains Bifurcation positions π-π interaction

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

Liquid crystal character controlled by complementary discotic molecules mixtures： Columnar stacking type and mesophase temperature range

引用

Chinese Chemical Letters 2016年第3期27卷 475-480页

作者： yan Li Ming-Guang Li Ya-Jun Su Jian-Gang Liu yan-chun han Shi-Jun Zheng Li-Xiang Wang State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China University of the Chinese Academy of Sciences Beijing 100049 China School of Materials Science and Engineering Zhengzhou University Zhengzhou 450052 China

In this work, the mesophase properties were tuned via mixing two discotic molecules with structural complementarity. Compared with the liquid crystalline hexakis（n-hexyloxy）triphenylene（H6TP）materials（columnar hexagonal phase from 53 ℃ to 91 ℃）, mesophase types as well as phase transition temperatures varied with the introduction of crystalline hexaazatriphenylene derivative（PBH）molecules. The introduction of less than 33% amount of PBH disrupted the columnar hexagonal phase formed by H6 TP remarkably, followed by the decreased clearing temperatures of liquid crystals. As the PBH amount was further increased, the destroyed columnar hexagonal phase was turned into the columnar rectangular phase, in which H6 TP and PBH molecules together formed the columnar mesophase. The formation of new mesophase contributed to the enlarged mesophase temperature（from44 ℃ to 144 ℃）. We speculated that the alkyl chains interaction induced by the PBH component competed with the strong p–p stacking between H6 TP molecules, thus altering the liquid crystalline properties including mesophase types and phase transition temperatures.

关键词： Alkyl chains packing Mesophase type Liquid crystals Phase transitions Mixture

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

To improve alignment of isoindigo-based conjugated polymer film by controlling contact line receding velocity

引用

Chinese Chemical Letters 2017年第8期28卷 1663-1669页

作者： Shuai-Jie Chi Liang Chen Hong-Xiang Li Jian-Gang Liu Xin-Hong Yu yan-chun han State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of the Chinese Academy of Sciences Beijing 100049China

The macroscopic alignment of conjugated polymers with low grain boundary is essential to carrier transport. During film forming process, the match between contact line receding velocity and the critical alignment velocity is essential to get the alignment polymer film. In this paper, the contact line receding velocity of a D-A conjugated polymer film, isoindigo and bithiophene（IIDDT-C3）, was adjusted by solvent vapor content and film-formation temperature. Only when solvent vapor content was 0.3 m L and the film-formation temperature was 90C, the contact line receding velocity was in accordance with the critical alignment velocity, and the highest degree of alignment was attained in the IIDDT-C3 film, with the dichroic ratio up to 4.08. Fibers were aligned parallel with the direction of the contact line receding and the molecules of IIDDT-C3 adopted an edge-on orientation with the backbone parallel with the direction of fiber long axis. The p-p stacking distance between adjacent molecules was 3.63 ？.

关键词： IID-based conjugated polymers Alignment Contact line receding velocity Critical alignment velocity

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

Expression of connective tissue growth factor in tumor tissues is an independent predictor of poor prognosis in patients with gastric cancer

引用

World Journal of Gastroenterology 2008年第13期14卷 2110-2114页

作者： Lu-Ying Liu yan-chun han Shu-Hua Wu Zeng-Hua Lv Department of Pathology Binzhou Medical Collage Binzhou 256603 Shandong Province China Department of Pathology Affiliated Hospital of Binzhou Medical Collage Binzhou 256603 Shandong Province China

AIM: To examine the expression of connective tissue growth factor (CTGF), also known as CCN2, in gastric carcinoma (GC), and the correlation between the expression of CTGF, clinicopathologic features and clinical outcomes of patients with GC. METHODS: One hundred and twenty-two GC patients were included in the present study. All patients were followed up for at least 5 years. Proteins of CTGF were detected using the Powervision two-step immunostaining method. RESULTS: Of the specimens from 122 GC patients analyzed for CTGF expression, 58 (58/122, 47.5%) had a high CTGF expression in cytoplasm of gastric carcinoma cells and 64 (64/122, 52.5%) had a low CTGF expression. Patients with a high CTGF expression showed a higher incidence of lymph node metastasis than those with a low CTGF expression (P = 0.032). Patients with a high CTGF expression had significantly lower 5-year survival rate than those with a low CTGF expression (27.6% vs 46.9%, P = 0.0178), especially those staging Ⅰ+Ⅱ+Ⅲ (35.7% vs 65.2%, P = 0.0027). CONCLUSION: GC patients with an elevated CTGF expression have more lymph node metastases and a shorter survival time. CTGF seems to be an independent prognostic factor for the successful differentiation of high-risk GC patients staging Ⅰ+Ⅱ+Ⅲ. Over-expression of CTGF in human GC cells results in an increased aggressive ability.

关键词： Connective tissue growth factor Gastric cancer Prognosis Lymph node metastasis

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

Isolation and Culture of a kind of Derived Cells from Differentiation Group Of Murine ESC-like Cell and Their Traits in Culture

引用

生物医学工程学杂志 2005年第S1期22卷 177-178页

作者： Qi-Shuang GAO Ting YU Bang-You LI yan-Yun han chun-han AIchun-Fang WANG Jing-Fu LV Jian-Ying WU(Wuhan Institute of Pasturage and Veterinary,Wuhan 430000,China) Wuhan Institute of Pasturage and Veterinary Wuhan 430000 China

1 IntroductionIn the process of culturing ESC-like cell from murine blastula,we find that even if no inducing factor was added, ESC-like cell masses can different into many kinds of cell groups. Study on the biological traits, culturing and change of functional genetics of those cell groups will be of great meaning to find out the mechanism of differentiation and possible value of ESC-like cells. UP to now, there are not many references and reports on this aspect. This article introduces a kind of derived cells isolated from ESC-like cell, the change of its growth, and need of culturing conditions, which may be useful in further study on ESC-like cells.

关键词： ESC Isolation and Culture of a kind of Derived Cells from Differentiation Group Of Murine ESC-like Cell and Their Traits in Culture

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

全高分子太阳能电池活性层相分离结构调控

引用

高分子学报 2018年第2期28卷 145-163页

作者：宋春鹏曲轶刘剑刚韩艳春高功率半导体激光国家重点实验室长春理工大学理学院长春130022 海南师范大学物理与电子工程学院海口571158 高分子物理与化学国家重点实验室中国科学院长春应用化学研究所长春130022

全共轭聚合物太阳能电池具有给受体能级可调、吸收范围宽及可溶液加工等优势,已经成为太阳能电池领域发展趋势.在开发高性能材料及器件结构优化的推动下,能量转换效率已经突破9%.然而,共轭聚合物分子刚性及分子结构各向异性等特点,导致... 详细信息

全共轭聚合物太阳能电池具有给受体能级可调、吸收范围宽及可溶液加工等优势,已经成为太阳能电池领域发展趋势.在开发高性能材料及器件结构优化的推动下,能量转换效率已经突破9%.然而,共轭聚合物分子刚性及分子结构各向异性等特点,导致全共轭聚合物共混体系相分离及结晶行为复杂,相区尺寸及界面处分子取向可控性差,难于深入理解并认识活性层结构对器件光物理过程的影响.本文从热力学及动力学角度入手,详述了全共轭聚合物共混体系相分离结构、相区尺寸及界面分子取向的可控调节.共混体系中分子迁移能力及溶液相分离类型是影响相分离结构的本质因素,并通过改变给受体比例及分子规整度等实现了孤岛、双连续及互穿网络结构的构筑.同时,通过添加第3组分调节溶剂-溶质分子间相互作用或聚合物分子间相互作用,在不降低活性层结晶性的基础上实现了相区尺寸的调控.最后,利用附生受限结晶原理及溶液状态,通过改变分子运动能力及在溶液中聚集程度,实现了由edge-on到face-on取向的转变.

关键词：全共轭聚合物太阳能电池形貌调控相分离结构相区尺寸分子取向

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

Elafibranor:A promising therapeutic approach for liver fibrosis and gut barrier dysfunction in alcohol-associated liver disease

引用

World Journal of Gastroenterology 2025年第3期31卷 123-126页

作者： chun-han Cheng Wen-Rui Hao Tzu-Hurng Cheng Department of Medical Education Linkou Chang Gung Memorial HospitalTaoyuan 33305Taiwan Division of Cardiology Department of Internal MedicineShuang Ho HospitalMinistry of Health and WelfareTaipei Medical UniversityNew Taipei City 23561Taiwan Division of Cardiology Department of Internal MedicineSchool of MedicineCollege of MedicineTaipei Medical UniversityTaipei 11002Taiwan Department of Biochemistry School of MedicineCollege of MedicineChina Medical UniversityTaichung 404328Taiwan

This article discusses the recent study written by Koizumi et ***-associated liver disease(ALD)is a major cause of liver-related morbidity and mortality,which is driven by complex mechanisms,including lipid accumulation,apoptosis,and inflammatory responses exacerbated by gut barrier *** study explored the therapeutic potential of elafibranor,a dual peroxisome proliferatoractivated receptor alpha/delta *** clinical trials,elafibranor has shown promise for the treatment of other liver conditions;however,its effects on ALD remain *** authors’findings indicate that elafibranor significantly reduced liver fibrosis and enhanced gut barrier integrity in patients with *** positive effects of elafibranor are mediated through multiple *** promotes lipid metabolism,reduces oxidative stress,and inhibits inflammatory responses by restoring gut barrier ***,it improves hepatocyte function by enhancing autophagic and antioxidant capacity,and it mitigates inflammation by suppressing the lipopolysaccharide/toll-like receptor 4/nuclear factor kappa B signaling *** findings indicate that elafibranor has promising clinical *** addition,the study highlights elafibranor’s potential as a therapeutic agent for liver diseases,particularly *** article underscores the importance of understanding the mechanistic pathways underlying ALD and suggests directions for future research aimed at elucidating the benefits and limitations of elafibranor.

关键词： Elafibranor Liver fibrosis Gut barrier function Alcohol-associated liver disease Peroxisome proliferatoractivated receptor agonists

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

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：