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Online since: July 2015
Authors: Vladimir Polyanskiy, Alexander Belyaev, Yuri A. Yakovlev
It is typical for these branches that the ratio of the structure mass to the payload plays the critical part.
The minimum safety coefficient for strength leads to the necessity of exact calculation with account for all factors during the structure exploitation.
Determination of Hydrogen Binding Energy in Various Materials by Means of Absolute Measurements of its Concentration in Solid Probe// Hydrogen Materials Science and Chemistry of Carbon Nanomaterials, SPRINGER SCIENCE + BUSINESS MEDIA B.V. 2006 p.641-652 [3] Polyanskiy A.M., Polyanskiy V.A., Yakovlev Yu.A.
Online since: December 2012
Authors: Wang Kang, Guo Shun Wan, Jiang Lei, Hong Jun Huang
A Research of the Spongy Foams from Interpenetrating Polymer Network of Polyurethane/ Epoxy Resin Huang Hongjun 1, a, Wang Kang 1,b, Wan Guoshun 2,c and Jiang Lei 3,d 1Staff room of Physics-Chemistry, Mechanical Engineering College, Shijiazhuang 050003, China 2Representative Office in No.743 Factory, Taiyuan 030027, China 3Baicheng Test Centre, Baicheng 137001, China aHHJRFZ318@sina.com, bwangkang65128@sina.com, cwanshunzi@yahoo.com.cn, djlddd03@126.com Keywords: polyurethane; epoxy resin; interpenetrating polymer network; spongy foam; initial adhesion; morphology Abstract: A series of interpenetrating polymer networks (IPN) spongy foams based on polyurethane (PU) and epoxy resin (EP) were prepared by a simultaneous polymerization technique.
The initial adhesion was characterized by a Electronic tensile test machine to choose the optimal epoxy content, the functional groups in PU/EP IPN structure were analyzed by FTIR, the density of foams was studied by a electronic density scale, and bubble morphology with different epoxy content were investigated with electron microscope. 2.Experiment 2.1 Materials The monomers Polyether polyol (TEP330N,Mn=2000) and Diphenylmethane diisocyanate (MDI) were obtained from Tianjin Petrochemical Corperation and Yantai Wanhua Polyurethane Company, respectively.
IR spectrum of PU/EP IPN foam with epoxy content of 20% 3.3 Density test results of PU/EP IPN foams Fig. 3 Density of foams with different epoxy content As shown in Fig. 3, it was obvious that with increasing of epoxy content, the density increased, indicating the foam structure got denser because of higher degree of cross-linking. 3.4 Electron microscope photographs of different PU/EP IPN Fig. 4 showed the electron microscope photographs of PU/EP IPN foams with different content of epoxy ranging of 0, 10, 20, 30%.
Online since: August 2013
Authors: Wei Ming Wang, Di Ma, Zai Sheng Cai, Bo Yu
Donghua University, College of Chemistry ,Chemical Engineering and Biotechnology Shanghai 200051, Peoples R China 2.
Raw stove ash was obtained from a Chinese stove plant located in Zhejiang province, dark grey in color and with angular, porous chunk structures.
Fig. 1 Chemical structure of Direct Red 4BS 2.2Methods The adsorption of dye was performed by shaking different weight of ash in 100mL of dye solution of desired concentration at 80 rpm for various time(Oscillating dyeing machine Rapid L-12C).At specific time intervals, suitable dose of the sample was withdrawn and centrifugation.
Online since: February 2013
Authors: Jian Guo Cui, Huan Zhou Zhang, Zhao Cheng Zhang
PAC has strong void structure, stable adsorption and high specific area .At the same time, PAC could be jointed with phenol into conjugates, so phenol is removed easily [8] .There are so many classic examples in domestic and overseas [9, 10].
Quinlivan, “Effects of activated carbon surface chemistry and pore structure on the adsorption of organic contaminants from aqueous solution”, Carbon, Vol 40, pp. 2085-2100, December 2002
Online since: February 2013
Authors: Yu Zhen Wang, Shu Zhong Wang, Yang Guo, Dong Hai Xu, Hang Yu, Guang Xin Yu, Jin Peng Sheng
In addition, the SCWO system features automatization, compact structure, small space required, easy installation and maintenance.
In addition, the SCWO system features automatization, compact structure, small space required, zero secondary environmental pollution, easy installation and maintenance
Xu: submitted to Industrial and Engineering Chemistry Research (2012) [13] J.
Online since: January 2010
Authors: Michael Tatoulian, Farzaneh Arefi-Khonsari, Diego Mantovani, Hervé Willaime, Patrick Tabeling, Nathalie Vo Tan Tho
Plasma processing has been developed to produce selective chemistry in the inner surface of a microfluidic system.
A relief structure was obtained which was used for the molding of PDMS with the soft lithography technique [11-13].
Indeed, when the chemical structure of the initial monomer is considered, the maximum proportion of COOH functionalities which could be possibly obtained is 33% (1 COOH group per 3 Carbon atoms at the most).
Online since: March 2016
Authors: Jing De Zhang, Jun Peng Luan, Ya Lei Liu, Fei Li, Chag Ku Ding
Influence of Bi2O3 on Microstructure and Properties of YSZ Solid Electrolyte Material Junpeng Luan1, 2, a, Jingde Zhang1, 2, 3, b*, Yalei Liu1, 2, c, Changku Ding1, 2, d and Fei Li1, 2, e 1School of Material Science and Engineering, Shandong University, Jinan 250061, Shandong, China 2Key Lab. of Liquid-solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, Shandong, China 3Key Lab. of Special Functional Aggregated Materials, Ministry of Education, Shandong University, Jinan 250100, Shandong, China a850141562@qq.com, bzhangjingde@sdu.edu.cn, cliuyalei_0910@126.com, dyuzhu8912@163.com, e1442852570 @qq.com Keywords: Bi2O3, YSZ, Structure, Electrical conductivity.
References [1] Sarikaya A, Petrovsky V, Dogan F, Development of the anode pore structure and its effects on the performance of solid oxide fuel cells.
J Chemistry of materials. 8(1996) 1287-1291
Online since: May 2011
Authors: Hong Xu Li, Bei Jin, Chuan Qi Jiao, Bin Bin Liu
The reasons appeared as above is rest on the special structure of powder micro electrode on which the polarization currents are composed by two parts of thin layer current and micro disc current, at high sweep rate the ‘Thin layer’ electrode effect could not be ignored, and the current through it like as Eq. 2: (2) Where V is liquid phase volume of thin layer,φ is polarization potential, v is scanning rate, c* is concentration of ferrous in solution, n is reaction electron number, F is Farady constant.
Electro analytical Chemistry, vol. 368, no.1-2, (1994) p. 47-54 [14] V.
Zoski: Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, vol. 245, (1988), p. 71-104
Online since: October 2011
Authors: Georg Berger, Renate Gildenhaar, C. Knabe, C. Gomes, Ulf Linow, A. Houshmand
With respect to three-dimensional scaffolds, in addition to the chemical composition and surface chemistry of these scaffolds also their porosity has a great impact on their osteogenic potential.
Hence, calcium alkali phosphates are excellent candidate materials for investigating the combined effect of material chemistry and porosity on the rate of bone formation and biodegradation of the scaffold.
Structure and porosity of granules E1504 (a) and U0806(b) When using standard parameters, the printer works with a 10 print passes/jet spacing, which is related to the amount of droplets per pixel.
Online since: February 2014
Authors: Song Lin Wang, Ming Dan, Si Wu, Ning Zhou, Qi Zhang
Introduction Humic substances are the most widely-occurring natural mixture of organic compounds, which play an important role in both pollutant control chemistry and biogeochemistry in aquatic environment [1].
Higher percentage of UV254 removal compared to TOC removal indicated that the presence of refractory compounds and an incomplete mineralization of the organics after the breakup of large aromatic and conjugated structures.
Wang, Fe3O4 magnetic nanoparticles as peroxidase mimetics and their applications in H2O2 and glucose detection, Analytical Chemistry, 80 (2008) 2250-2254