Research on the mechanism of interaction between styrene–butadiene–styrene (Sbs) and asphalt based on molecular vibration frequency
作者：
Zeng, Yuqin;Liu, Qicheng* ;Zeng, Qing;He, Yuhao;Xu, Zhenghong
期刊：
Materials ,2021年14(2):1-14 ISSN：1996-1944
通讯作者：
Liu, Qicheng
作者机构：
[Liu, Qicheng; Zeng, Yuqin; Zeng, Qing] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410114, Peoples R China.;[Liu, Qicheng; Zeng, Yuqin; Zeng, Qing] Changsha Univ Sci & Technol, Hunan Prov Key Lab Flexible Elect Mat Genome Engn, Changsha 410114, Peoples R China.;[Xu, Zhenghong; He, Yuhao] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Peoples R China.
通讯机构：
[Liu, Qicheng] C;Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410114, Peoples R China.;Changsha Univ Sci & Technol, Hunan Prov Key Lab Flexible Elect Mat Genome Engn, Changsha 410114, Peoples R China.
关键词：
Aromatization;Asphaltenes;Binding energy;Blending;Butadiene;Chemical bonds;Density functional theory;Fourier transform infrared spectroscopy;Molecular vibrations;Polybutadienes;Resins;Styrene;Component theories;Interaction strength;Peak intensity;Physical blending;SBS-modified asphalt;Vibration spectrum;Asphalt
摘要：
Based on the four-component theory of asphalt, molecular models of the saturate, aromatic, resin, and asphaltene were constructed, respectively. The styrene–butadiene–styrene (SBS) polymer was used as the modifier. Using density functional theory (DFT) to study the effect of SBS on the molecular vibration of each component of asphalt, the vibration spectrums and binding energy of the systems composed of SBS and each component molecule of asphalt were calculated. Prepared SBS modified asphalt and measured Fourier transform infrared spectroscopy (FTIR) before and after the experiment. The results show that after SBS was added to asphalt, no chemical reaction occurred, and the system was mainly physical blending. The vibrational peak intensity of SBS and the light components of asphalt (saturate and aromatic) is stronger than that of SBS and the heavy components of asphalt (resin and asphaltene). The interaction strengths of asphalt components and polybutadiene (PB) blocks, polystyrene (PS) blocks of SBS are different. The binding energy of SBS and the saturate is the lowest and the bonding of the system is weakest. The bonding of the systems of SBS and the aromatic, resin, asphaltene is stable, and the stability of these systems are all stronger than that of SBS and the saturate. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
语种：
英文
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Preparation and modification mechanism analysis of graphene oxide modified asphalts
作者：
Zeng, Qing;Liu, Yaru;Liu, Qicheng* ;Liu, Peng;He, Yuhao;...
期刊：
Construction and Building Materials ,2020年238:117706 ISSN：0950-0618
通讯作者：
Liu, Qicheng
作者机构：
[Liu, Qicheng; Zeng, Qing] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410114, Peoples R China.;[Liu, Yaru] Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China.;[Liu, Peng; He, Yuhao; Zeng, Yuqin] Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410114, Peoples R China.
通讯机构：
[Liu, Qicheng] C;Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410114, Peoples R China.
关键词：
Density functional theory;Graphene oxide;Modification mechanism;Modified asphalt
摘要：
Preparation of graphene oxide (GO) by oxidative dispersion, using GO as an asphalt modifier, graphene oxide modified asphalt was prepared by high temperature melting method. The effect of GO incorporation on the basic physical properties of asphalt was investigated, and the X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR) were used to analyze the microstructure characteristic of GO and modified asphalt. In order to reveal the bonding mechanism between GO and asphalt, a calculation model of asphalt molecules and GO molecules was constructed. Each of constructed asphalt molecules and GO molecules were placed in the primitive cells to obtain systems of asphalt with GO. Density functional theory (DFT) was used to calculate the molecular charge density, the electron density difference, the binding energy and the number of charges transferred between asphalt and GO. The results shown that the GO improved high temperature stability and heat aging resistance of the asphalt, but unable improve the crack resistance of the asphalt. GO was stably dispersed in asphalt, GO modified asphalt by forming an intercalation structure, which improves the high temperature stability of the asphalt. However, the effect of GO on asphalt was based on the physical modification, which unable crosslink each other in the asphalt, as a result, the crack resistance of the modified asphalt unable be improved. Density functional calculation results show that the bonding of resin with GO was the most stable, followed by those for aromatic with GO, and those for saturate with GO was the weakest, GO can hinder the movement of saturate and inhibit the volatilization of saturate, thereby improving the high temperature stability and heat aging resistance of asphalt. GO molecules can form hydrogen bonds with asphalt molecules, and it can also form aromatic ring stacks with aromatic and resin molecules, these non-bond interactions were the key to the stable dispersion of GO in asphalt. © 2019 Elsevier Ltd
语种：
英文
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Rolling membrane powered by low-temperature steam as a new approach to generate mechanical energy
作者：
Yin, Chongshan* ;Liu, Qicheng;Liu, Qing
期刊：
Scientific Reports ,2020年10(1):16573 ISSN：2045-2322
通讯作者：
Yin, Chongshan
作者机构：
[Liu, Qicheng; Yin, Chongshan] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410114, Peoples R China.;[Liu, Qing] Chinese Acad Sci, Changsha 410114, Peoples R China.
通讯机构：
[Yin, Chongshan] C;Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410114, Peoples R China.
摘要：
<jats:title>Abstract</jats:title><jats:p>How to convert heat energy intoother forms of usable energy more efficiently isalways crucial for our human society. In traditional heat engines, such as the steam engine and the internal combustion engine, high-grade heat energy can be easily converted into mechanical energy, while a large amountof low-grade heat energy isusually wasted owing to its disadvantage in the temperature level. In this work, for the first time, the generation of mechanical energy from both high- and low-temperature steam is implemented by a hydrophilic polymer membrane. When exposed to water vapor with a temperature ranging from 50 to 100°C, the membrane repeats rolling from one side to another. In nature, this continuously rolling of membrane is powered by the steam, like a miniaturized “steam engine”. The differentialconcentrationof water vapor (steam) on the two sides of the membrane generates the asymmetric swelling, the curve, and the rolling of the membrane. In particular, results suggest that this membrane based “steam engine” can be powered by the steam with a relatively very low temperature of 50°C, which indicates a new approach to make useof both the high- and low-temperature heat energy.</jats:p>
语种：
英文
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Free volume, gas permeation, and proton conductivity in MIL-101-SO3H/Nafion composite membranes.
作者：
Yin, Chongshan* ;He, Chunqing* ;Liu, Qicheng;Xiong, Bangyun;Zhang, Xiaowei;...
期刊：
PHYSICAL CHEMISTRY CHEMICAL PHYSICS ,2019年21(47):25982-25992 ISSN：1463-9076
通讯作者：
Yin, Chongshan;He, Chunqing
作者机构：
[Liu, Qicheng; Yin, Chongshan] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410114, Hunan, Peoples R China.;[Zhang, Xiaowei; Zhou, Yawei; Qian, Libing; He, Chunqing] Wuhan Univ, Sch Phys & Technol, Key Lab Nucl Solid State Phys Hubei Prov, Wuhan 430072, Hubei, Peoples R China.;[Xiong, Bangyun; Li, Jingjing] Foshan Univ, Sch Mat Sci & Energy Engn, Foshan 528000, Peoples R China.
通讯机构：
[Yin, Chongshan] C;[He, Chunqing] W;Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410114, Hunan, Peoples R China.;Wuhan Univ, Sch Phys & Technol, Key Lab Nucl Solid State Phys Hubei Prov, Wuhan 430072, Hubei, Peoples R China.
摘要：
A series of MIL-101-SO3H/Nafion composite membranes was synthesized. They show an improved proton conductivity, due to the abundance of SO3H groups, which fosters proton conduction by binding the water molecules and enabling a larger number of conducting sites. Gas (including water vapor, hydrogen, and oxygen) permeability, crystallinity, and free volumes of the MIL-101-SO3H/Nafion composite membranes were investigated, as well as their correlation. By increasing the MIL-101-SO3H content, the gas permeability of the membranes significantly decreases, since the crystalline region is larger and the water-bearing MIL-101-SO3H particles are efficient barriers for the gas molecules. The gas permeation in the composite membranes is a very complex process and the results indicate no simple linear relation between the gas permeability and the free volume size (VFV), or between the gas permeability and the crystallinity. Moreover, it is very interesting to observe that the influence of VFV on the gas permeability is closely related to the size of the particular gas molecules: the larger the size of the gas molecules, the larger the free volume needed to achieve their rapid diffusion in the membrane. The results suggest the presence of a threshold value for VFV, which depends on the size of the gas molecules: when VFV is lower than this value, the gas molecules cannot easily jump through neighboring free volumes to a neighboring site, and, as a result, the permeability drops quickly.
语种：
英文
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碳纳米管与氮化硼纳米管内铝纳米线的形成及其复合结构抗压特性的模拟研究
作者：
Yuan Jian-Hui* ;Lei Qin-Wen;Liu Qi-Cheng*
期刊：
物理学报 ,2019年68(18):186101 ISSN：1000-3290
通讯作者：
Yuan Jian-Hui;Liu Qi-Cheng
作者机构：
[Yuan Jian-Hui; Liu Qi-Cheng; Lei Qin-Wen] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Hunan Prov Key Lab Flexible Elect Mat Genome Engn, Changsha 410114, Hunan, Peoples R China.
通讯机构：
[Yuan, JH; Liu, QC] C;Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Hunan Prov Key Lab Flexible Elect Mat Genome Engn, Changsha 410114, Hunan, Peoples R China.
关键词：
铝纳米线;碳纳米管与氮化硼纳米管;分子动力学;抗压特性
摘要：
采用分子动力学方法分别对管内充以铝原子碳纳米管(CNT)与氮化硼纳米管(BNNT)进行了结构性能研究.优化结果显示:(5,5)CNT和BNNT内均能形成一束一维铝纳米线(AlNW);(10,10)管内形成的是多束AlNW,其中(10,10)CNT内形成的是11束高度轴对称一维AlNW,而(10,10)BNNT内形成的是5束螺旋结构形状的AlNW.进一步分析表明:CNT内的AlNW具有比BNNT内的AlNW较大的原子分布线密度,但大管径(10,10)型BNNT内的螺旋状AlNW可以具有比相同管径CNT内纳米线更高的结晶性.通过对其轴向压缩模拟及其能量分析,可以发现AlNW@CNT复合结构的屈曲应变明显大于AlNW@BNNT,且同类型复合结构,屈曲应变随管径增大而减小,故较小管径的AlNW@CNT具有更强轴向抗压能力.能量分析结果表明van der Waals能是维系复合纳米管结构稳定,增大抗压能力的主要原因.
语种：
中文
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Lateral-aligned sulfonated carbon-nanotubes/Nafion composite membranes with high proton conductivity and improved mechanical properties
作者：
Yin, Chongshan* ;Xiong, Bangyun;Liu, Qicheng;Li, Jingjing;Qian, Libing;...
期刊：
Journal of Membrane Science ,2019年591:117356 ISSN：0376-7388
通讯作者：
Yin, Chongshan
作者机构：
[Liu, Qicheng; Yin, Chongshan] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Hunan Prov Key Lab Flexible Elect Mat Genome Engn, Changsha 410114, Hunan, Peoples R China.;[Xiong, Bangyun] Foshan Univ, Sch Mat Sci & Energy Engn, Foshan 528000, Peoples R China.;[Zhou, Yawei; Qian, Libing; Li, Jingjing; He, Chunqing] Wuhan Univ, Sch Phys & Technol, Key Lab Nucl Solid State Phys Hubei Prov, Wuhan 430072, Hubei, Peoples R China.
通讯机构：
[Yin, Chongshan] C;Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Hunan Prov Key Lab Flexible Elect Mat Genome Engn, Changsha 410114, Hunan, Peoples R China.
关键词：
Alignment;Multilayered structure;Nafion;Proton conductivity;Sulfonated carbon nanotubes
摘要：
Proton exchange membranes, such as the widely used Nafion membranes, are essential components in industrial proton-exchange membrane fuel cells. In this study, multilayer sulfonated carbon-nanotubes/Nafion composite membranes with high performances have been prepared using layer-by-layer assembly. The membranes consist of a certain number of equally thick sulfonated carbon-nanotubes/Nafion layers. The thickness of the layers varies from 40 μm to 0.5 μm. This study indicates that the multilayered structure in composite membranes, especially in membranes with ultrathin layers (<1 μm), encourages the alignment of the sulfonated carbon-nanotubes and the proton-conducting pathways in the lateral direction (parallel to the membrane interface). The multilayered structure also improves the dispersion of sulfonated carbon-nanotubes, which leads to a uniformly-distributed proton-conducting network. Therefore, the multilayer composite membranes are excellent proton conductors in the lateral direction at different temperatures. In addition, due to the formation of a hydrophilic interface between the layers, the composite membranes show a higher water-retention capacity. Furthermore, the lateral-aligned sulfonated carbon-nanotubes lead to significantly improved mechanical properties of the multilayer composite membranes, which results in a better electrochemical stability and a long-term performance stability of membranes.<br/> ©2019 Elsevier B.V.
语种：
英文
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等离子喷涂搪瓷瓷釉涂层的耐腐蚀性能
作者：
刘其城;曾大雁;徐协文;尹业豪
期刊：
长沙理工大学学报(自然科学版) ,2016年13(01):87-92 ISSN：1672-9331
作者机构：
长沙理工大学 物理与电子科学学院,湖南 长沙,410004;[徐协文; 曾大雁; 刘其城; 尹业豪] 长沙理工大学
关键词：
等离子喷涂;搪瓷瓷釉;涂层;腐蚀
摘要：
通过添加改性剂改性瓷釉，采用等离子喷涂技术喷涂在 Q235钢表面形成耐腐涂层，利用 SEM 等手段对其微观结构进行了分析和表征，用静态腐蚀实验和电化学腐蚀实验对涂层的耐腐蚀性能进行了研究。研究结果表明，所有涂层在碱性溶液中都基本不腐蚀；所有涂层在酸性溶液中的腐蚀程度都比基体钢板小，且改性剂为 NiO 的涂层的耐酸腐蚀性能稍优于改性剂为 TiO 2的涂层；涂层的耐电化学腐蚀能力要优于基体钢板，且添加 NiO 的涂层的耐电化学腐蚀性能稍优于添加 TiO 2的涂层。搪瓷瓷釉涂层在一定程度上提高了基体钢板的耐腐蚀性能。
语种：
中文
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有机蒙脱土／DOP改性沥青的制备及性能
作者：
刘其城;尹业豪;曾大雁
期刊：
长沙理工大学学报(自然科学版) ,2016年13(3):6-11 ISSN：1672-9331
作者机构：
长沙理工大学物理与电子科学学院,湖南长沙,410004;[曾大雁; 刘其城; 尹业豪] 长沙理工大学
关键词：
有机蒙脱土;改性沥青;针入度;软化点;延度;抗老化性;微观结构
摘要：
采用超声法,以钠基蒙脱土为原料,用十六烷基三甲基溴化铵（CTAB）对其进行有机化改性,制备出了有机蒙脱土（OMMT）。采用熔融插层法制备了OMMT/DOP（邻苯二甲酸二辛酯）改性沥青。利用XRD和SEM对改性沥青的微观结构进行表征,探讨了OMMT,DOP对沥青物理性能的影响。研究结果表明,经有机化改性后,蒙脱土的层间距得到了有效扩大,能够均匀分散在改性沥青中,形成了一种剥离型结构;OMMT的加入使得改性沥青针入度和延度减小,软化点升高,沥青的高温性能和抗老化性能得到了改善,不利于沥青的低温性能;而DOP能够显著改善蒙脱土改性沥青的低温性能。
语种：
中文
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研讨式教学法在《聚合物流变学》课程中的应用实践
作者：
刘鹏;刘其城;叶昌;李海斌;李富进
期刊：
教育教学论坛 ,2016年(2):120-121 ISSN：1674-9324
作者机构：
长沙理工大学 物理与电子科学学院,湖南 长沙,410114;[李富进; 李海斌; 刘其城; 刘鹏; 叶昌] 长沙理工大学
关键词：
研讨式教学;聚合物流变学;材料类专业;课后实践
摘要：
本文针对材料类专业学生的学习特点,结合专业特色和学科发展趋势,开展了以课堂研讨与课后实践相结合的教学改革,提出了研讨式教学模式的实施路径。教学改革有效调动了学生学习的积极性与创造性,加深了学生对流变学基础理论的理解,提升了学生利用流变学知识解决实际问题的能力。
语种：
中文
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高温渗碳制备防静电氧化锆陶瓷
作者：
杨现锋;徐协文;刘其城;谢志鹏
期刊：
材料研究学报 ,2016年30(1):45-50 ISSN：1005-3093
通讯作者：
Yang, Xianfeng(yangxf05@mails.thu.edu.cn)
作者机构：
[杨现锋; 徐协文; 刘其城] College of Physics and Electronics Science, Changsha University of Science & Technology, Changsha;410014, China;[谢志鹏] State Key Laboratory of New Ceramics and Fine Processing, College of Materials Science, Tsinghua University, Beijing;100084, China;[杨现锋; 徐协文; 刘其城] 410014, China
通讯机构：
[Yang, X.] C;College of Physics and Electronics Science, China
关键词：
无机非金属材料;渗碳;表面电阻率;氧化锆
摘要：
用高温渗碳方法制备氧化锆陶瓷,研究了渗碳温度和时间对表面电阻率和维氏硬度的影响。结果表明,高温渗碳后在氧化锆陶瓷表面形成了改性层;随着渗碳温度的提高和渗碳时间的延长表面电阻率下降,维氏硬度升高。渗碳温度为1450℃、渗碳时间为3 h的氧化锆陶瓷,其表面电阻率由1014W/□低至107W/□,维氏硬度略有升高达到14 GPa。显微结构和组成分析结果表明,在氧化锆陶瓷表面形成了约3μm的改性层。结果证实,C元素的浓度从表面到内部逐渐降低,在内部主要以单质形式存在,在表层主要以单质C及Zr C0.85形式存在,使其具有防静电性能。
语种：
中文
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Synthesis and characterization of iron oxide/ carbon microspheres composite material
作者：
Liu, Qi-Cheng;Wu, Zhi-Yuan;Liu, Peng;Luo, Xing
期刊：
Materials Science Forum ,2016年852:556-559 ISSN：0255-5476
作者机构：
[Liu, Peng; Luo, Xing; Liu, Qi-Cheng; Wu, Zhi-Yuan] College of Physics and Electronic Science, Changsha University of Science and Technology, Changsha, China
会议名称：
China Functional Material Technology and Industry Forum, CFMTIF 2015
会议时间：
30 October 2015 through 1 November 2015
关键词：
Carbon;Functional materials;Hematite;Iron oxides;Morphology;Nanoparticles;Particle size;Sodium hydroxide;Average diameter;Carbon microspheres;Different carbon sources;Disordered carbon;Hydrothermal methods;Spherical morphologies;Synthesis and characterizations;Synthetic routes;Microspheres
摘要：
Different carbon sources were chosen to synthetize microspheres by hydrothermal method. X-ray diffraction indicated a highly disordered carbon structure. SEM images showed that the carbon microspheres had perfect spherical morphology, smooth surface and uniform particle size of 1-2 μm. Nanoscale iron oxide was synthesized on the microspheres support via hydrothermal synthetic route using Fe(NO)3 and NaOH as reagents. The nanoparticles were α-Fe2O3, and uniformly loaded on the surface of the carbon microspheres with average diameter around 200 nm. © 2016 Trans Tech Publications, Switzerland.
语种：
英文
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Adsorption, photocatalytic and sunlight-driven antibacterial activity of Bi2WO6/graphene oxide nanoflakes
作者：
Chen, Chuansheng* ;Cao, Shiyi;Yu, Weiwei;Xie, Xiaodi;Liu, Qicheng;...
期刊：
Vacuum ,2015年116:48-53 ISSN：0042-207X
通讯作者：
Chen, Chuansheng
作者机构：
[Yu, Weiwei; Cao, Shiyi; Liu, Qicheng; Xie, Xiaodi; Chen, Chuansheng; Xiao, Yi] Changsha Univ Sci & Technol, Coll Phys & Elect Sci, State Engn Lab Highway Maintenance Technol, Changsha 410114, Hunan, Peoples R China.;[Tsang, Yuenhong] Hong Kong Polytech Univ, Dept Appl Phys, Hong Kong, Hong Kong, Peoples R China.
通讯机构：
[Chen, Chuansheng] C;Changsha Univ Sci & Technol, Coll Phys & Elect Sci, State Engn Lab Highway Maintenance Technol, Changsha 410114, Hunan, Peoples R China.
关键词：
Graphene oxide;Bi2WO6 nanoflakes;Photocatalytic;Antibacterial activity
摘要：
The Bi<inf>2</inf>WO<inf>6</inf>/graphene oxide (BWO/GO) nanoflake hybrids were prepared by cetyltrimethylammonium bromide (CTAB)-assisted hydrothermal method. Compared with the pure BWO catalysts, the resultant BWO/GO nanohybrids exhibited higher adsorptive ability and visible-light photocatalytic activity for rhodamine B (RhB) under Xe lamp irradiation. Furthermore, it has a high circulative stability and antibacterial ability. This work will provide some supports for the potential applications of BWO/GO nanohybrids in photocatalysis and antibacterial materials under common environment. ©2015 Elsevier Ltd. All rights reserved.
语种：
英文
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Dynamic fracture characteristics of cylindrical steel shell under internal blast loading
作者：
Hu, Yongle* ;Liu, Qicheng;Bai, Shuxin;Zhang, Hong
期刊：
International Journal of Materials and Structural Integrity ,2015年8(4):291-302 ISSN：1745-0055
通讯作者：
Hu, Yongle
作者机构：
[Bai, Shuxin; Zhang, Hong] College of Aerospace and Material Engineering, National University of Defense Technology, Changsha 300072, China;[Liu, Qicheng] College of Physics and Electronic Science, Changsha University of Science and Technology, Changsha 410004, China;[Hu, Yongle] Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle, Changsha University of Science and Technology, Hunan Province, Changsha 410004, China
通讯机构：
Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle, Changsha University of Science and Technology, Changsha, Hunan Province, China
关键词：
Dynamics;Elastoplasticity;Failure analysis;Plastic deformation;Shear bands;Shear flow;Shearing;Shearing machines;Shells (structures);Tensile strength;Blast loading;Cylindrical steel shells;Dimple fracture;Dynamic finite element analysis;Dynamic fracture characteristics;Elastic-plastic response;Explosion containment vessels;Internal blast loading;Ductile fracture
摘要：
Dynamic fracture characteristics are the foundation for conducting safety assessment and failure analysis of explosion containment vessels (ECVs) subjected to internal blast loading. The experiment was conducted to investigate dynamic fracture characteristics of cylindrical steel shells subjected to internal blast loading at the centre. The elastic-plastic response of cylindrical steel shells was simulated numerically by using nonlinear dynamic finite element analysis code LS-DYNA. The fracture mode and mechanism of a cylindrical shell were specially studied by means of the analysis of deformation, macrographs and meso-graphs of fracture surface and elastic-plastic response. The results show that the axial direction fracture surface of the cylindrical steel shell exhibits a mixed ductile fracture mode with shearing dimple by micro-voids coalescence. Dynamical ductility deformations appear and the shear bands form when the cylindrical steel shell expands under internal blast loading. The fracture mechanism is that the shear bands destroyed the initiation and growth of the micro-voids and micro-cracks along the shear bands due to its softening effect under tensile circumferential stress. The shear bands and the tensile circumferential stress dominate the final fracture mode. The fracture mode is the ductile fracture. Copyright © 2014 Inderscience Enterprises Ltd.
语种：
英文
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Injection molding of ultra-fine Si_3N_4 powder for gas-pressure sintering
作者：
Yang, Xian-feng* ;Yang, Jiang-hong;Xu, Xie-wen;Liu, Qi-cheng;Xie, Zhi-peng;...
期刊：
矿物冶金与材料学报：英文版 ,2015年22(6):654-659 ISSN：1674-4799
通讯作者：
Yang, Xian-feng
作者机构：
[Yang, Jiang-hong; Liu, Qi-cheng; Yang, Xian-feng; Xu, Xie-wen] Changsha Univ Sci & Technol, Coll Phys & Elect Sci, Changsha 410014, Hunan, Peoples R China.;[Xie, Zhi-peng; Liu, Wei] Tsinghua Univ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China.
通讯机构：
[Yang, Xian-feng] C;Changsha Univ Sci & Technol, Coll Phys & Elect Sci, Changsha 410014, Hunan, Peoples R China.
关键词：
ceramic materials;silicon nitride;injection molding;sintering;near net shaping
摘要：
The ceramic injection molding technique was used in the gas-pressure sintering of ultra-fine Si3N4 powder. The feedstock’s flowability, debinding rate, defect evolution, and microstructural evolution during production were explored. The results show that the solid volume loading of less than 50vol% and the surfactant mass fraction of 6wt% result in a perfect flowability of feedstock; this feedstock is suitable for injection molding. When the debinding time is 8 h at 40°C, approximately 50% of the wax can be solvent debinded. Defects detected during the preparation are traced to improper injection parameters, mold design, debinding parameters, residual stress, or inhomogeneous composition distribution in the green body. The bulk density, Vickers hardness, and fracture toughness of the gas-pressure-sintered Si3N4 ceramic reach 3.2 g/cm3, 16.5 GPa, and 7.2 MPa·m1/2, respectively. © 2015, University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg.
语种：
英文
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Preparation and photocatalytic activity of multi-walled carbon nanotubes/Mg-doped ZnO nanohybrids
作者：
Chen, C. S.* ;Xie, X. D.;Cao, S. Y.;Liu, T. G.;Lin, L. W.;...
期刊：
MATERIALS SCIENCE-POLAND ,2015年33(3):460-469 ISSN：2083-1331
通讯作者：
Chen, C. S.
作者机构：
[Liu, Q. C.; Xiao, Y.; Cao, S. Y.; Kuang, J. C.; Chen, C. S.; Xie, X. D.] Changsha Univ Sci & Technol, Coll Phys & Elect Sci, Changsha 410114, Hunan, Peoples R China.;[Lin, L. W.; Chen, C. S.] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China.;[Chen, X. H.; Liu, T. G.] Hunan Univ, Coll Phys & Microelect Sci, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Chen, C. S.] C;Changsha Univ Sci & Technol, Coll Phys & Elect Sci, Changsha 410114, Hunan, Peoples R China.
关键词：
Azo dyes;Carbon nanotubes;Citrus fruits;Electronic properties;Nanostructured materials;Nanotubes;Photocatalysis;Photodegradation;Precipitation (chemical);Yarn;Zinc oxide;Coprecipitation method;Degradation of methyl oranges;Methyl Orange;Mg doped zno nanoparticles;Mg-doped ZnO;Mg-doping;Nanohybrids;Photocatalytic activities;Multiwalled carbon nanotubes (MWCN)
摘要：
Multi-walled carbon nanotubes/Mg-doped ZnO (MWNTs/Zn1-xMgxO) nanohybrids were prepared by co-precipitation method, and their photocatalytic activity for methyl orange (MO) was studied. Experimental results showed that Mg-doped ZnO nanoparticles were successfully deposited on the surface of MWNTs under annealing at 450 °C and 550 °C. The resultant MWNTs/Zn0.9Mg0.1O nanohybrids had better photocatalytic activity for degradation of methyl orange than pure ZnO: the rates of MO photodegradation were 100 % and 30 % for 1 h, respectively. The enhancement in the photocatalytic activity was attributed to the excellent electronic properties of MWNTs and Mg-doping. © 2015 Wroclaw University of Technology.
语种：
英文
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Enhanced photocatalytic properties of graphene oxide/ZnO nanohybrid by Mg dopants
作者：
Chen, C. S.* ;Xie, X. D.;Cao, S. Y.;Liu, T. G.;Tsang, Y. H.;...
期刊：
PHYSICA SCRIPTA ,2015年90(2):025806 ISSN：0031-8949
通讯作者：
Chen, C. S.
作者机构：
[Liu, Q. C.; Xiao, Y.; Cao, S. Y.; Chen, C. S.; Gong, L.; Yang, X. F.; Xie, X. D.] Changsha Univ Sci & Technol, Coll Phys & Elect Sci, Changsha 410114, Hunan, Peoples R China.;[Liu, T. G.] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Tsang, Y. H.] Hong Kong Polytech Univ, Dept Appl Phys, Hong Kong, Hong Kong, Peoples R China.;[Tsang, Y. H.] Hong Kong Polytech Univ, Mat Res Ctr, Hong Kong, Hong Kong, Peoples R China.
通讯机构：
[Chen, C. S.] C;Changsha Univ Sci & Technol, Coll Phys & Elect Sci, Changsha 410114, Hunan, Peoples R China.
关键词：
graphene oxide;Mg-doped ZnO;nanohybrids;photocatalytic property
摘要：
In this study, the enhancement of photocatalytic activity of a graphene oxide/ZnO (GO/ZnO) nanohybrid was achieved via introducing Mg as a co-dopant element by the co-precipitation method. The Mg-doped ZnO nanoparticles were adsorbed on GO sheets. Compared with the catalyses with GO/ZnO nanohybrids, GO/Zn<inf>1-xMg</inf>xO nanohybrids exhibited better photocatalytic activity, in which the decomposition rate of methyl orange (MO) reached 100% within 60 min. The enhancement is attributed to Mg-doping and efficient charge transfer of the photogenerated electrons in the conduction band of ZnO to graphene. ©2015 The Royal Swedish Academy of Sciences.
语种：
英文
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Graphene Oxide/ZnO-Bi2O3 Nanoplate Photocatalysis with Strong Adsorption Capacity and High Efficient under Simulated Solar Light
作者：
Yu, Weiwei;Liu, Yaru;Xie, Xiaodi;Chen, Chuansheng* ;Liu, Qicheng;...
期刊：
Integrated Ferroelectrics ,2015年160(1):55-62 ISSN：1058-4587
通讯作者：
Chen, Chuansheng
作者机构：
[Yu, Weiwei; Liu, Qicheng; Xie, Xiaodi; Yang, Xianfeng; Chen, Weiwei; Chen, Chuansheng; Gong, Li] Changsha Univ Sci & Technol, Coll Phys & Elect Sci, Changsha 410114, Hunan, Peoples R China.;[Liu, Yaru] Hunan Normal Univ, Key Lab Phytochem R&D Hunan Prov, Changsha 410081, Hunan, Peoples R China.
通讯机构：
[Chen, Chuansheng] C;Changsha Univ Sci & Technol, Coll Phys & Elect Sci, Changsha 410114, Hunan, Peoples R China.
会议名称：
13th China International Nanoscience and Technology Symposium (CINSTS)
会议时间：
OCT 26-30, 2014
会议地点：
Chengdu, PEOPLES R CHINA
会议主办单位：
[Yu, Weiwei;Xie, Xiaodi;Chen, Chuansheng;Liu, Qicheng;Yang, Xianfeng;Gong, Li;Chen, Weiwei] Changsha Univ Sci & Technol, Coll Phys & Elect Sci, Changsha 410114, Hunan, Peoples R China.^[Liu, Yaru] Hunan Normal Univ, Key Lab Phytochem R&D Hunan Prov, Changsha 410081, Hunan, Peoples R China.
关键词：
adsorption capacity;Graphene oxide;photocatalytic property;ZnO-Bi2O3 nanoplate
摘要：
Graphene/ZnO-Bi2O3 nanoplates (GZB) were prepared by means of the low temperature hydrothermal method, and their photocatalytic activity for degradating rhodamine B (RhB) was studied. Experimental results show that the ZnO-Bi2O3 nanoparticles were supported on graphene sheet under the assist of cetyltrimethylammonium bromide (CTAB). Furthermore, the resultant GZB nanoplates exhibited very strong adsorption capacity and high photocatalytic activity, in which the first absorbed ability comes up to about 74.62% within 30 min. Moreover, 90% RhB in solution can be degraded within 100 min under visible light after the sample reach the maximum adsorption.
语种：
英文
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水性聚氨酯乳液包覆硝酸肼镍及其性能研究
作者：
周伟伟;成茵;刘其城;吴钟晴;刘武
期刊：
火炸药学报 ,2015年38(5):90-94 ISSN：1007-7812
通讯作者：
Cheng, Y.
作者机构：
[周伟伟; 成茵; 刘其城; 吴钟晴] School of Physics and Electronics Science, Changsha University of Science and Technology, Changsha, 410004, China;[刘武] Research Center of Liuyang Fireworks Engineering, Liuyang, Hunan 410300, China
通讯机构：
School of Physics and Electronics Science, Changsha University of Science and Technology, Changsha, China
关键词：
应用化学;硝酸肼镍;水性聚氨酯乳液;破乳法;钝感包覆
摘要：
通过自乳化法制备了水性聚氨酯乳液,采用破乳法对硝酸肼镍进行钝感包覆,分析了影响包覆效果及样品机械感度的工艺参数。用红外光谱、X射线衍射、SEM、差热分析对包覆前后硝酸肼镍的晶型、表面形貌、分解温度进行了表征,测试了其摩擦感度和火焰感度。结果表明,破乳包覆后硝酸肼镍的晶体结构不变,属于物理吸附包覆,且随着水性聚氨酯乳液用量的增加,表面官能团组成并无改变,聚氨酯特征振动峰的强度相应增强;包覆后硝酸肼镍的分解温度从232℃升至259℃;摩擦感度起爆压力值由35MPa升至318MPa,钝感包覆效果良好。最佳的包覆工艺条件为:破乳温度40℃,破乳时间15min,破乳剂滴加速率1滴/s,破乳剂与聚氨酯质量比15∶1。
语种：
中文
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MCMB的表面修饰及电化学性能
作者：
罗兴;刘其城;刘鹏;吴志远
期刊：
长沙理工大学学报(自然科学版) ,2015年12(2):95-99 ISSN：1672-9331
作者机构：
长沙理工大学物理与电子科学学院,湖南长沙,410004;[刘鹏; 刘其城; 吴志远; 罗兴] 长沙理工大学
关键词：
中间相炭微球;水热法;改性;复合材料
摘要：
对中间相炭微球(MCMB)进行改性处理,将处理后的MCMB记为DMCMB,然后采用水热法制备纳米金属氧化物以包覆DMCMB表面制备微纳复合材料.相同工艺下使用未处理的MCMB原料进行空白试验对比,用XRD,FTIR,SEM和比表面检测进行表征.研究结果表明,DMCMB包覆有大量粒径在50～80 nm范围的纳米粒子,而空白试验样品表面覆载量极其有限.恒流充放电测试结果表明,复合样品随着循环的进行,其比容量值下降,但最后又有缓和的趋势.
语种：
中文
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无机非金属材料工程专业毕业实习教学模式改革探索
作者：
成茵;夏清;叶昌;刘其城
期刊：
科技创新导报 ,2015年(18):163-164 ISSN：1674-098X
作者机构：
长沙理工大学物理与电子科学学院 湖南长沙410114;[成茵; 刘其城; 叶昌; 夏清] 长沙理工大学
关键词：
无机非金属材料工程;毕业实习;实践教学改革;实习评价体系
摘要：
作为无机非金属材料工程专业实践教学体系中的重要环节之一,毕业实习教学模式的改革与实践往往是各大高校教育者研究思考的热点问题。该文针对无机非金属材料工程专业毕业实习内容与模式单一化,指导教师青年化,学生就业形势以及企业生产形势严重影响实习效果等现状问题,从实习基地建设、实习内容及模式改革、青年指导教师激励制度建立以及毕业实习评价体系建立及监管方面等方面提出了有效的改革方案,为全面提高无机非金属材料专业毕业实习质量相关措施的制定提供参考依据。
语种：
中文
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