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Online since: July 2015
Authors: Qing Yu Ma, Jian Quan Li, Bing Xue Yang
We chose benzene 2,6-alkynyl, respectively, and tetrakis (4-bromophenyl) silane, tetrakis (3-bromophenyl) silane synthesis of new cross-linked polymer, the structure was characterized by solid NMR, by fluorescence chromatography UV crosslinking compound characterization of chromatographic performance in photophysical aspects may choose to add a new organic light-emitting material.
Results and Discussion Structural Characterization.In order to prove the success of the reaction and the cross-linked polymer structure, we use cross-polarization magic angle spinning nuclear magnetic resonance techniques resulting solid material was characterized, as shown in Figure 2.1 compound 1 and 2 solid 13C CP/MAS NMR and 29Si MAS NMR spectrum.
References [1] Wenyan.Sun, Dengxu.Wang, Qingling.Lai, Reserch functional silane and coordination compounds, Advances in chemistry. 2010, 22, 400
Online since: July 2013
Authors: Hong Wei Zhao, Hu Huang, Zhi Chao Ma, Lin Zhang, Chun Yang Geng, Zhi Chao Ma
In the phase transformation region beneath the indenter, the crystalline structures of Si-II, Si-XIII, and amorphous phase structures are observed.
Figure 2 shows the evolution of atomic structures in the nanoindentation.
Si-II atoms forms a crystal structure with lattice parameters a=4.684Å and c=2.585Å.
(a) Tetrahedron before nanoindentation, (b) deformation tetrahedron on cutting, (c) atomic structure of five coordinate during phase transition, (d) structure of one of the atoms in crystal structure Si-II and (e) structure of one of the atoms in crystal structure Si-XIII, where the bond lengths are shown in angstrom meter.
Tersoff, Modeling Solid-State Chemistry: Interatomic Potentials for Multicomponent Systems, Phys.
Online since: November 2018
Authors: Felipe Marti-Montava, Ann Opsommer, David Garcia-Sanoguera
K, Na,..) on the C-S-H-structure and its ability to recrystallize [22].
Jennings, Solubility and Structure of Calcium Silicate Hydrate, Cement and Concrete Research, 34 (2004) 1499-1519
Iler, The Chemistry of Silica, Solubility, Polymerization, Colloid and Surface Properties, and Biochemistry, John Wiley& Sons, New York, 1979
Perry, An overview of the fundamentals of the chemistry of silica with relevance to biosilicification and technological advances, Federation of European Biochemical Societies Journal, 279 (2012) 1710-1720
Stumm, Structure, bonding and morphology of hydrothermally synthesized xonotlite, Advances in Applied Ceramics, 108 (2009) 137-144
Online since: June 2020
Authors: Ilze Baltiņa, Ilze Balgale
Woven Textile Pressure Switch Ilze Balgale1,a and Ilze Baltina1,b 1Institute of Design Technologies, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Latvia ailze.balgale@rtu.lv, bilze.baltina@rtu.lv Keywords: electrically conductive textiles, textile pressure switch, woven three-dimensional fabrics, hollow woven fabrics.
Electrically conductive yarns can be integrated into textile structure.
Data Transfer Structures.
Data transfer structures, textile pressure sensors and systems are examples of interactive structures based on three-dimensional and/or multilayer principles.
Geometrical description of a three-layer fabric structure.
Online since: October 2011
Authors: Young Ho Kim, Hyun Kyu Lee, Youn Jin Park, Yoon Ji Lee, A.I. Gopalan, Kwang Pill Lee, Sang June Choi
Gopalan3, Kwang-Pill Lee1,3, and Sang-June Choi1,2,c,* 1Research Institute of Advanced Energy Technology, Kyungpook National University, Daegu 702-701, South Korea 2Department of Environmental Engineering, Kyungpook National University, Daegu 702-701, South Korea 3Department of Chemistry Education, Kyungpook National University, Daegu 702-701, South Korea ayoungkim@knu.ac.kr, blhk7933@knu.ac.kr, csjchoi@knu.ac.kr Keywords: Carbon Nanotube, Nafion® membrane, Fuel Cell Abstract Styrenesulfonate grafted multi-walled carbon nanotubes (ss-MWCNTs) were prepared by a simple chemical reaction with soduim 4-styrenesulfonate to reinforce Nafion® membranes for use in direct methanol fuel cells (DMFCs).
Further, the phenyl structure of the styrenesulfonate groups on the ss-MWCNTs enhanced thermal stability at high temperature.
Further, the phenyl structure of the styrenesulfonate groups on the ss-MWCNTs could enhance thermal stability at high temperatures.
Online since: June 2010
Authors: Qian Chu Liu, Madabhushi Janardhana, Reza Mohammed, Graham Clark
High-strength steels are used in several critical aerospace applications such as aircraft landing gear, primary structure and engine components.
Introduction High strength steels, including the AISI 4340 used in this study, are used in many aerospace applications such as landing gear and primary structure.
Future work will assess defect chemistry, and explore deposition conditions which do not produce defects, so that an optimum condition can be established.
Online since: December 2010
Authors: Song Lin Ding, John Mo, R. Izamshah R.A.
The resulting thin-walled structure often suffers a deformation which causes a dimensional surface error due to the action of the cutting force generated during the machining process.
However, because of the poor stiffness, the resulting thin-walled structure often suffers a deformation which causes a dimensional surface error due to the action of the cutting force generated during the machining process.
Chemistry N C H O Fe Al V Ti Other el. % w/w, min. - - - - - 5.50 3.50 - - % w/w, max. 0.05 0.10 0.0125 0.20 0.30 6.75 4.50 Balance 0.40 Table 2.
Online since: September 2013
Authors: Yi Bin Huang, Zhen Sheng Zhong, Yi Hua Qian, Yan Zhang
Research on Preparation and Application of High-performance Hydrogenated Transformer Oil QIAN Yihua1, a, HUANG Yibin2,b, ZHANG Yan3,c and ZHONG Zhensheng2,d 1Electric Power Research Institute of Guangdong Power Grid Corporation ,China 2College of Chemistry and Chemical Engineering, South China University of Technology,China 3Shanghai Branch, Lubricant Company, Sinopec Corp.
The functional properties, refining and stability, performance in service, health, safety and environment properties of hydrogenated transformer oil were studied comprehensively and deeply under the static and dynamic condition, especially at the level of molecular structure.
IEC 62021-1 Interfacial tension/(mN/m ) ≮40 49 ASTM D971 Total sulphur content/% No general requirement 0.0058 ISO 14596 Corrosive sulphur Not corrosive Not corrosive DIN 51353 Potentially corrosive sulphur Not corrosive Not corrosive IEC 62535 Inhibitors of IEC 60666/% 0.08~0.40 0.32 IEC 60666 2-Furfural and related compounds content/(mg/kg) ≯0.05 <0.01 IEC 61198 Oxidation stability(120℃,500h) Total acidity(mg KOH /g) Sludge /% DDF(90℃) ≯1.2 ≯0.8 ≯0.5 0.158 0.0108 0.0111 IEC 61125 Gassing tendency/(ul/min) No general requirement 20.5 - Flash point/℃ ≮135 158 ISO 2719 PCA content/% ≯3 <0.1 IP 346 PCB content/% Not detectable Not detectable IEC 61619 Study on Performace of Hydrogenated Transformer Oil The functional properties, refining and stability, performance in service, health, safety and environment properties of hydrogenated transformer oil were studied comprehensively and deeply under the static and dynamic condition, especially at the level of molecular structure
Online since: October 2006
Authors: Guido Roma
Moreover it is know that SiC under irradiation can become amorphous, showing then chemical disorder (up to about 30% of homonuclear bonds) [3]; this kind of amorphous structure could possibly enhance the process leading to the formation of the silicide.
Liu, Intermetallics Vol. 14 (2006), p.560 [8] Gmelin Handbook of Inorganic Chemistry, Silicon Supplement Volume B 3 (SiC) (Springer, 1986), p. 163-164.
Online since: May 2011
Authors: Dong Lin, Chao Jin Wang, Feng Bo Dong, Song Lou, Chong Qi Shou
Surface Modification of Carbon Fiber by Polymer Emulsions and Mechanical Property of Modified Carbon Reinforced Concrete Dong Lin1,a, Chaojin Wang2,b, Fengbo Dong2,c, Song Lou3,d, Chongqi Shou1,e* 1School of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, China 2Zibo Mining Group Co., Ltd., Zibo, 255120, China 3Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences, Lanzhou, 730000, China alindong3503@163.com, bchaojinwang@tom.com,c342302878@qq.com, dlousong_cn@163.com, escq211@163.com Keywords: Surface modification; coal pitch carbon fiber; concrete; mechanical property Abstract.
The reason is that different polymers possess different molecular structures and different inter-molecular forces between the polymers and fiber surface.