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Low band-gap benzodithiophene-thienothiophenecopolymers: the effect of dual two-dimensional substitutions on optoelectronic properties

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Science China Chemistry 2015年第2期58卷 267-275页

作者： zhulin Liu Jiangman Sun yongxiang zhu Peng Liu Lianjie Zhang Junwu Chen Fei Huang Yong Cao Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of Technology

Two new conjugated copolymers, PBDT-T6-TTF and PBDT-T12-TTF, were derived from a novel 4-fluorobenzoyl thienothi- ophene （TTF）. In addition, two types of benzodithiophene （BDT） units with 2,3-dihexylthienyl （T6） and 2,3-didodecylthienyl （T12） substituents, respectively, were successfully synthesized. The effect of the dual two-dimensional （2D） substitutions of the building blocks upon the optoelectronic properties of the polymers was investigated. Generally, the two polymers exhibited good solubility and broad absorption, showing similar optical band gaps of ~1.53 eV. However, PBDT-T6-TTF with its shorter alkyl chain length possessed a larger extinction coefficient in thin solid film. The highest occupied molecular orbital （HOMO） level of PBDT-T6-TTF was located at -5.38 eV while that of PBDT-T12-TTF was at -5.51 eV. In space charge-limited- current （SCLC） measurement, PBDT-T6-TTF and PBDT-T12-TTF displayed respective hole mobilities of 3.0~10-~ and 1.6x10 5 cm2 V-1 s-l. In polymer solar cells, PBDT-T6-TTF and PBDT-T12-TTF showed respective power conversion efficiencies （PCEs） of 2.86% and 1.67%. When 1,8-diiodooctane （DIO） was used as the solvent additive, the PCE of PBDT-T6-TTF was remarkably elevated to 4.85%, but the use of DIO for the PBDT-T12-TTF-blend film resulted in a lower PCE of 0.91%. Atomic force microscopy （AFM） indicated that the superior efficiency of PBDT-T6-TTF with 3% DIO （v/v） should be related to the better continuous phase separation of the blend film. Nevertheless, the morphology of the PBDT-T12-TTF deteriorated when the 3% DIO （v/v） was added. Our results suggest that the alkyl-chain length on the 2D BDT units play an important role in determining the optoelectronic properties of dual 2D BDT-TT-based polymers.

关键词： conjugated copolymers benzodithiophene thienothiophene dual 2-dimentional substitutions alkyl side-chain length

Design, synthesis and photovoltaic properties of a series of new acceptor-pended conjugated polymers

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Science China Chemistry 2016年第12期59卷 1583-1592页

作者： Zhihong Wu yongxiang zhu Wei Li Yunping Huang Junwu Chen Chunhui Duan Fei Huang Yong Cao Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of Technology

A series of novel acceptor-pended conjugated polymers featuring a newly developed carbazole-derived unit are designed and synthesized. The relationships between chemical structure and optoelectronic properties of the polymers are systematically in-vestigated. The control of UV-Vis absorption spectra and energy levels in resulting polymers are achieved by introducing suitable pended acceptor units. The photovoltaic properties of the resulting polymers are evaluated by blending the polymers with （6,6）-phenyl-CTFbutyric acid methyl ester. The resulting solar cells exhibit moderate performances with high open-circuit voltage. Charge transport properties and morphology were investigated to understand the performance of corresponding solar cells.

关键词： acceptor.pended conjugated polymers polymer solar cells band gap energy level

Effect of driver roll rotational speed on hot ring rolling of AZ31 magnesium alloy

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Journal of Magnesium and Alloys 2014年第2期2卷 154-158页

作者： Xiaodong Luo Lianjie Li Wenlin Xu yongxiang zhu College of Metallurgical and Materials Engineering Chongqing University of Science and TechnologyChongqing 400041China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China

Based on the ABAQUS/Explicit code,A 3D elastic-plastic and coupled thermo-mechanical FE model of radial ring rolling of AZ31 Magnesium alloy has been proposed to analyze the influence of rotational speed of driver roll to study the inhomogeneity distribution of strain and temperature,fishtail coefficient,rolling force *** results show that:(1)when the rotational speed of driver roll n increases,the strain distribution of the rolled ring becomes less homogeneous,and the temperature distribution more homogeneous yet,and leading to an optimal n value;(2)the fishtail coefficient firstly decreases,then increases with the increase of n;(3)the rolling force,contact area and rolling moment gradually descend with the increase of n.

关键词： Rotational speed of driver roll AZ31 magnesium alloy FEM Ring rolling

3D-printed Mg-1Ca/polycaprolactone composite scaffolds with promoted bone regeneration

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Journal of Magnesium and Alloys 2024年第3期12卷 966-979页

作者： Xiao Zhao Siyi Wang Feilong Wang Yuan zhu Ranli Gu Fan Yang yongxiang Xu Dandan Xia Yunsong Liu Department of Prosthodontics Peking University School and Hospital of StomatologyBeijing 100081China National Center of Stomatology National Engineering Laboratory for Digital and Material Technology of StomatologyNational Clinical Research Center for Oral DiseasesBeijing Key Laboratory of Digital StomatologyResearch Center of Engineering and Technology for Computerized Dentistry Ministry of HealthNMPA Key Laboratory for Dental MaterialsBeijing 100081China Department of Dental Materials Peking University School and Hospital of StomatologyBeijing 100081China

In bone tissue engineering,polycaprolactone(PCL)is a promising material with good biocompatibility,but its poor degradation rate,mechanical strength,and osteogenic properties limit its *** this study,we developed an Mg-1Ca/polycaprolactone(Mg-1Ca/PCL)composite scaffolds to overcome these *** used a melt blending method to prepare Mg-1Ca/PCL composites with Mg-1Ca alloy powder mass ratios of 5,10,and 20 wt%.Porous scaffolds with controlled macro-and microstructure were printed using the fused deposition modeling *** explored the mechanical strength,biocompatibility,osteogenesis performance,and molecular mechanism of the Mg-1Ca/PCL *** 5 and 10 wt%Mg-1Ca/PCL composites were found to have good ***,they promoted the mechanical strength,proliferation,adhesion,and osteogenic differentiation of human bone marrow stem cells(hBMSCs)of pure *** vitro degradation experiments revealed that the composite material stably released Mg_(2)+ions for a long period;it formed an apatite layer on the surface of the scaffold that facilitated cell adhesion and *** tomography and histological analysis showed that both 5 and 10 wt%Mg-1Ca/PCL composite scaffolds promoted bone regeneration bone *** results indicated that the Wnt/β-catenin pathway was involved in the osteogenic ***,Mg-1Ca/PCL composite scaffolds are expected to be a promising bone regeneration material for clinical *** of significance:Bone tissue engineering scaffolds have promising applications in the regeneration of critical-sized bone ***,there remain many limitations in the materials and manufacturing methods used to fabricate *** study shows that the developed Ma-1Ca/PCL composites provides scaffolds with suitable degradation rates and enhanced boneformation ***,the fused deposition modeling method allows precise control of the macroscopic morphology and microsc

关键词： 3D printing Bone tissue engineering Magnesium Osteogenic Polycaprolactone Scaffold.

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船用湿式多片式离合器改进后接合特性分析

机械传动 2015年第3期39卷 149-152,161页

作者：朱永祥南通航运职业技术学院江苏南通226010

为了进一步对船用湿式多片式离合器的接合特性进行准确分析以及为后续船用离合器优化设计奠定基础,以船用湿式离合器作为研究对象,在等温设计的基础上,通过对接合过程最优压力进行确定和对传统压力分布模型进行改进,得到一种针对湿式多... 详细信息

为了进一步对船用湿式多片式离合器的接合特性进行准确分析以及为后续船用离合器优化设计奠定基础,以船用湿式离合器作为研究对象,在等温设计的基础上,通过对接合过程最优压力进行确定和对传统压力分布模型进行改进,得到一种针对湿式多片式船用离合器接合特性的计算方法。分析结果表明:基于最优压力条件下湿式多片离合器主、从动盘角速度达到速度相同时所需时间明显小于线性压力作用,期间产生的滑磨功明显小于线性压力条件产生的滑磨功;采用不同压力分布得到的湿式离合器接合操作力变化存在差异,且修正后的接合操作力始终小于传统模型,接合操作力与接合压力为线性关系;实际湿式离合器有效半径与接合压力之间不存在直接联系,但在计算过程中发现新型压力分布模型始终大于传统模型。

关键词：湿式多片船用离合器改进接合特性

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晚清寅半生的小说理论及其意义

中国文学研究 2016年第2期 81-84页

作者：朱永香华东师范大学中文系上海200241 浙江农林大学文化学院浙江临安311300

科举考试制度停废后,寅半生在杭州创办了期刊《游戏世界》,开设了崇实斋书店,并开始介入小说界,其个人经历在近代小说界具有代表性。其《小说闲评》对当时66部新出小说一一进行介绍且品评,以此作为购书者的阅读指南,体现了他作为书商对... 详细信息

科举考试制度停废后,寅半生在杭州创办了期刊《游戏世界》,开设了崇实斋书店,并开始介入小说界,其个人经历在近代小说界具有代表性。其《小说闲评》对当时66部新出小说一一进行介绍且品评,以此作为购书者的阅读指南,体现了他作为书商对于小说市场的整体把握。他从纯文学角度注重小说的"游戏"功能,是对"小说界革命"后小说理论界的反思修正,也在客观上推动了中国小说理论现代性发生的进程。

关键词：寅半生晚清小说《小说闲评》《游戏世界》

船舶机械用10CrNi3MoV合金热成形过程中的力学性能分析

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铸造技术 2015年第5期36卷 1214-1216页

作者：朱永祥南通航运职业技术学院江苏南通226010 上海海事大学上海200000

研究了热成形前后船舶机械用10Cr Ni3Mo V合金的显微组织和力学性能变化。结果表明,经热成形后的10Cr Ni3Mo V合金的微观组织从外到里呈渐次变化,导致其材料的强度和硬度沿厚度方向从外到里依次增加,伸长率依次降低,结构的峰值力降低,... 详细信息

研究了热成形前后船舶机械用10Cr Ni3Mo V合金的显微组织和力学性能变化。结果表明,经热成形后的10Cr Ni3Mo V合金的微观组织从外到里呈渐次变化,导致其材料的强度和硬度沿厚度方向从外到里依次增加,伸长率依次降低,结构的峰值力降低,抗冲击性能有了很大提高。10Cr Ni3Mo V合金经热成形后非常适于在船舶机械上使用。

关键词： 0Cr Ni3Mo V合金船舶机械热成形力学性能