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Formation and evolution mechanisms of large-clusters during rapid solidification process of liquid metal Al

Science china(Physics,Mechanics & Astronomy) 2005年第1期48卷 101-112页

作者： LIU Rangsu, DONG Kejun, LIU Fengxiang, ZHENG Caixing, LIU Hairong & LI Jiyong Department of Applied Physics, hunan university, changsha 410082, china college of Materials Science and engineering, hunan university, changsha 410082, china college of chemistry and chemical engineering, hunan university, changsha 410082, china Department of Applied Physics Hunan University Changsha 410082 China college of Materials Science and engineering Hunan University Changsha 410082 China college of chemistry and chemical engineering Hunan University Changsha 410082 China

A molecular dynamics simulation study has been performed for the formation and evolution characteristics of nano-clusters in a large-scale system consisting of 400000 atoms of liquid metal Al. The center-atom method combined with pair-bond analysis technique and cluster-type index method (CTIM) has been applied here to describe the structural configurations of various basic clusters. It is demonstrated that both the 1551 bond-type and the icosahedral cluster (12 0 12 0) constructed by 1551 bond-types are dominant among all the bond-types and cluster-types, respectively, in the system and play a critical role in the microstructure transitions of liquid metal Al. The nano-clusters (containing up to 150 atoms) are formed by the combination of some middle and small clusters with distinctly different sizes, through mutual competition by unceasing annex and evolution in a seesaw manner (in turn of obtaining and losing),which do not occur as the multi-shell structures accumulated with an atom as the center and the surrounding atoms are arranged according to a certain rule. This is the essential distinction of nano-cluster in liquid metal from those obtained by gaseous deposition, ionic spray methods, and so on. Though the nano-clusters differ from each other in shape and size, all of them possess protruding corners that could become the starting points of various dendrite structures in the solidification processes of liquid metals.

关键词： liquid metal, solidification process, large-cluster configuration, evolution mechanism, computer simulation.

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Inductance-based sensing technique for wireless,remote-query measurement in liquid media

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Science china chemistry 2010年第6期53卷 1391-1397,1460页

作者： MA Lin,NIE Zhou,HUANG Yan & YAO ShouZhou State Key Laboratory of Chemo/Biosensing and Chemometrics,college of chemistry and chemical engineering,hunan university,changsha 410082,china State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University Changsha China

A novel inductance-based sensing technique is presented for remote query measurement in different liquid media including organic solvents and inorganic *** inorganic solutions tested included salt solutions of different concentrations,and the organic solvents detected included 1,4-dioxane and *** extend the application of the sensor,bacterial culture media were also detected,and the growth of Escherichia coli (***) was *** influential factors which may affect the inductance responses were studied in *** was found that quantitative relationships exist between the sensor’s inductance response and the physico-chemical parameters of the liquid *** sensor’s inductance response (L) decreases with the increase of salt concentration (C) and its ionic valence (e) according to a semi-logarithmic equation LgL =-aeC + b,where a and b are constants,which is in accordance with the theoretically deduced *** inductance variation rate (ΔK) increases directly with the temperature (T): ΔK = a′ T + b′.As for organic solutions,the sensor’s inductance was found to increase with the increasing permittivity of the organic *** wireless sensor we designed is simple and easy to *** has the potential for remote determination of not only chemical substances but also microbiological species such as *** the newly developed inductance-based sensor,the pathogenic *** was monitored with a limit of detection of 10 cells/mL and a linear semi-logarithmic range of 1.0 × 101 to 2.5 × 109 cells/mL.

关键词： inductance sensor remote-query liquid medium wireless bacterial detection E. coli.

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Cell-SELEX-based aptamer-conjugated nanomaterials for enhanced targeting of cancer cells

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Science china chemistry 2011年第8期54卷 1218-1226页

作者： KONG RongMei, CHEN Zhuo, YE Mao, ZHANG XiaoBing & TAN WeiHong State Key Laboratory for Chemo/Biosensing and Chemometrics college of chemistry and chemical engineering, hunan university, changsha 410082, china State Key Laboratory for Chemo/Biosensing and Chemometrics college of chemistry and chemical engineering Hunan University Changsha China

Early detection and treatment of cancer depends on developing highly sensitive and specific methods for targeting cancer cells. To do this, aptamers, which are generated by a novel technique caUed ceU-SELEX （systematic evolution of ligands by exponential enrichment）, have been widely applied in cancer cell targeting based on such merits as high target affinity and specificity, small size, minimal immunogenicity, and ease of chemical modification. Furthermore, aptamers can gain more flexibility as cancer cell targeting tools when conjugated to nanomaterials, including metallic nanoparticles, quantum dots, silica nanoparticles, and carbon nanomaterials, among others. In this review, we discuss the use of cell-SELEX-based aptamer-nanomaterials conjugates as novel molecular tools for enhanced targeting of cancer cells.

关键词： celI-SELEX aptamer nanomaterial cancer cells targeting

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Development of novel and sensitive sensors based on microcantilever of atomic force microscope

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Progress in Natural Science:Materials International 2006年第5期16卷 445-451页

作者： JIN Yan, WANG Kemin and JIN Rong (State Key Laboratory of Chemo/Biosensing and Chernometrics, Institute of Biological Technology, college of chemistry and chemical engineering, hunan university, changsha 410082, china) State Key Laboratory of Chemo Biosensing and Chemometrics Institute of Biological Technology College of Chemistry and Chemical Engineering Hunan University Changsha 410082 China

Recently, the development of sensors based on microfabricated cantilevers of atomic force microscope (AFM) has attracted considerable attention from the designers of novel physical, chemical, and biological sensors. Many kinds of sensors have been developed taking the advantages of its high-resolution imaging, force measurement and force sensitivity, such as immunosensor and DNA biosensor and the sensors for detection of intermolecular interaction. This paper reviews the progress made in this field and discusses the signal transfer principles by which the design of the sensors is achieved.

关键词： atomic force microscopy microcantilever sensor.

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Aspects of recent developments in analytical chemometrics

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Science china chemistry 2006年第3期49卷 193-203页

作者： LIANG Yizeng1,2, WU Hailong1, SHEN Guoli1, JIANG Jianhui1, LIANG Sheng2 & YU Ruqin1 1. State Key Laboratory of Chemo/Biosensing and Chemometrics, college of chemistry and chemical engineering, hunan university, changsha 410082, china 2. Research Center of Modernization of Traditional Chinese Medicines, Central South university, changsha 410081, china State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University Changsha China Research Center of Modernization of Traditional Chinese Medicines Central South University Changsha China

Some aspects of recent developments in analytical chemometrics are discussed, in par- ticular the developments viewed from the angle of the research efforts undertaken in authors’ labora- tories. The topics concerned include resolution of high-order chemical data, morphological theory and methodology for chemical signal processing, multivariate calibration and chemical pattern recognition for solving complex chemical problems, and resolution of two-way chemical data from hyphenated chromatographic instruments.

关键词： chemometrics, high-order chemical data, pattern recognition, multivariate calibration and resolution.

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Effect of Anodization on the Graphitization of PAN-based Carbon Fibers of PAN-based Carbon Fibers

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Journal of Wuhan university of Technology(Materials Science) 2011年第5期26卷 926-930页

作者：贺冬枚蔡青云 State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan University

One-step pretreatment,anodization,is used to activate the polyacrylonitrile （PAN）-based carbon fibers instead of the routine two-step pretreatment,sensitization with SnCl2 and activation with *** effect of the anodization pretreatment on the graphitization of PAN-based carbon fibers is investigated as a function of Ni-P *** PAN-based carbon fibers are anodized in H3PO4 electrolyte resulting in the formation of active sites,which thereby facilitates the following electroless Ni-P *** fibers in the presence and absence of Ni-P coatings are heat treated and the structural changes are characterized by X-ray diffraction and Raman spectroscopy,both of which indicate that the graphitization of PAN-based carbon fibers are accelerated by both the anodization treatment and the catalysts *** the anodized carbon fibers,the routine two-step pretreatment,sensitization and activation,is not needed.

关键词： anodization X-ray diffraction raman spectroscopy graphitization

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Influence of Roasting Factors on Tap Density of AMD

Influence of Roasting Factors on Tap Density of AMD

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2008年全国冶金物理化学学术会议

作者： Huang Caijuan~(1*) Yang Xiangping~2 (1.college of chemistry and chemical engineering,hunan university,changsha 410082,china 2.Science Press,Beijing 100717,china)

In the paper, the he mechanism of modification is researched in the process of masting nature manganese dioxide. It is concluded that the different structure of MnO results in coming into being different discharge cap... 详细信息

关键词： roast modification activate

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反应型三元铽配合物的合成及发光性能研究

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中国稀土学报 2004年第2期22卷 196-200页

作者：郭栋才舒万艮周悦刘又年中南大学化学化工学院湖南长沙410083 湖南大学化学化工学院湖南长沙410082

以邻菲咯啉为第一配体,顺丁烯二酸酐、丙烯腈、十一烯酸、油酸、亚油酸为活性第二配体,合成了5种新的反应型三元铽配合物。通过元素分析,EDTA配位滴定分析,红外、紫外、荧光光谱分析,对标题配合物的组成、结构进行了表征,并研究了它们... 详细信息

以邻菲咯啉为第一配体,顺丁烯二酸酐、丙烯腈、十一烯酸、油酸、亚油酸为活性第二配体,合成了5种新的反应型三元铽配合物。通过元素分析,EDTA配位滴定分析,红外、紫外、荧光光谱分析,对标题配合物的组成、结构进行了表征,并研究了它们的发光性能。结果表明,五种新的反应型三元配合物与相应的二元配合物相比发光强度大大提高,且配合物中引入了能与其它单体共聚的活性第二配体,为合成具有优异发光性能的键合型稀土高分子功能材料提供了一条新的途径。

关键词：无机化学邻菲咯啉反应型三元配合物发光稀土

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Granule-like Superhydrophobic Magnetic Particulates

Granule-like Superhydrophobic Magnetic Particulates

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2011年全国高分子学术论文报告会

作者： Rui Guo,Shuaijun Pan,Kai Huang,Xiangzhong Pang,Hao Chen,Ling Li,Xinchao Li,Cong Liu,Linhai Li,Zehui Li,Jianjiang Qian,Xinnian Xia,Weijian Xu Institute of Polymer Science and engineering,college of chemistry and chemical engineering,hunan university,changsha 410082,china

＜正＞In this paper,we reported a facile method to fabricate superhydrophobic magnetic particulates via sol-gel method and a further hydrophobization step using isocyanate chemistry. The shape of

关键词： Granule-like Magnetic Superhydrophobic Self-cleaning Sol-gel

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不锈钢基Ni-HAP生物材料的复合电镀研究

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无机材料学报 1998年第6期13卷 913-917页

作者：刘海蓉陈宗璋白晓军湖南大学化学化工学院长沙410082 广东工业大学材料系广州510090

本文研究了不同前处理工艺对Ni－HAP复合镀层性能的影响．发现电解抛光的基体与复合镀层的结合比机械抛光的基体与复合镀层的结合更紧密更牢固．制出了有应用前景的不锈钢基Ni－HAP复合生物材料．还对获得高HAP含量镀层的工艺条件及其... 详细信息

本文研究了不同前处理工艺对Ni－HAP复合镀层性能的影响．发现电解抛光的基体与复合镀层的结合比机械抛光的基体与复合镀层的结合更紧密更牢固．制出了有应用前景的不锈钢基Ni－HAP复合生物材料．还对获得高HAP含量镀层的工艺条件及其机理进行了初步探讨．

关键词：不锈钢基体抛光复合电镀复合陶瓷生物陶瓷

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