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Online since: November 2011
Authors: Ya Wei Hu, Yang Min Ma, Hui Rong He
Hydrothermal Synthesis, Photoluminescence Property and Superhydrophobicity of In(OH)3 Yawei Hua, Huirong He and Yangmin Ma Key Laboratory of Auxiliary Chemistry Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science and Technology, Xi’an, Shaanxi 710021, P.
In recent years, Much progress has been made on the synthesis of semiconductor nanomaterials in recent years, much attention has been paid to the fabrication and self-assembly of wide-bandgap semiconducting oxides because of their interesting optical and electronic feature [3-5], including fabrication of semiconductor mateials with hollow and core-shell structures [6-9].
The phase and the crystallographic structure of the In(OH)3 nanocubes were charactered by an X-ray diffractometer (XRD) with Cu Kα radiation (λ = 0.154 nm) at a scanning rate of 8 °·min-1 ranging from 10º to 80º.
The surface topography and structures of the In(OH)3 nanocubes were characterized by a scanning electron microscope (SEM).
Online since: September 2011
Authors: Huan Qun Qian, Chang Yong Wang
These investigations were usually focused on relations between flow structure (flow patterns, phase and velocity distributions, etc.) and an average heat transfer coefficient [2-4].
They reflect the different nature of flow structure and thermal structure in different flow regimes respectively.
Series Vol. 77(208)(1981), p. 140 [7] I.V.Domanskii, V.B.Tishin, and V.N.Sokolov: J Applied Chemistry of the USSR Vol. 42(1969), p. 809 [8] L.Fried: Chem.
Online since: October 2011
Authors: Brian Yuliarto, Mardiana Silvia, Muhammad Iqbal, Nugraha Nugraha
Layer with a porous structure will have a specific surface area large enough to improve the process of electrochemical reactions take place at the contact area between the oxide materials with a reagent substance.
X-Ray diffraction patterns of nanostructure Zinc oxide, (a) pure Zinc oxide, (b) Fe-modified Zinc oxide (b) (a) Fig. 2: The SEM measurement of pure ZnO and Fe-modified ZnO The SEM measurement (Fig. 2) shows that the nano flower like structure was formed in both pure ZnO and Fe-modified ZnO.
These data indicate that form of impurity atoms Fe grown successfully in a thin layer as doping and it was very possible Fe atoms replace Zn atoms in the crystal structure since the atomic radius is almost the same.
Ichihara: Analytical Chemistry Vol. 76 (2004), p. 6719
Online since: February 2012
Authors: Yuan Qiang Jin, Yu Li Zang
The design of dynamic parameters of the measurement system The compendium of the structure rationale of the measurement system.
In the design of relative structure, the radial size of the plane gratings should be minimized to assure the free frequency larger.
References [1] Yeon Doo Cheonget et al 1999 Analysis and development of the angular twist type torque-meter Composite structures vol 47 pp457-462
[4] Zhang Youyi 1986 Torque Measurement Technology Measurement Ltd 2ering Chemistry Research,2004,43(9):2104-2112.
Online since: January 2015
Authors: Mirosław Wróbel, Zbigniew Szklarz, Halina Krawiec
Influence of the crystallographic orientation of grains and plastic deformation on the electrochemical behavior of pure aluminum in sodium chloride solution Zbigniew Szklarz1,a*, Halina Krawiec1,b and Mirosław Wróbel2,c 1AGH-University of Science and Technology, Faculty of Foundry Engineering, Department of Chemistry and Corrosion of Metals, ul.
Alternatively, the island-type oxide morphology on an {001} surface may assist local electron tunnelling and reduction of the adsorbed oxygen when compared with the ordered structure on a {111} surface.
One can see that ca. 8° angle of mutual inclination of the two boundaries produces a significant difference between the fine structures of {100} and {107} surfaces, Fig.1(a) and 1(b).
On the other hand, the surface structure is not very different for the two other orientations ({223} and {557} in Fig. 1(c) and 1(d)).
Online since: July 2008
Authors: Xiao Ling Liao, Wen Feng Xu, Zhi Qiang Gao
Study on the Fatigue Behavior of Carbon/Carbon Composites Xiaoling Liaoa , Wenfeng Xu b , Zhiqiang Gao c Chemistry and Environment Science Department, Chongqing University of Arts and Sciences, Chongqing 402160, China a zxc_228@163.com; bxwf_228@163.com; c gzq@cqwu.net Key words: carbon/carbon composites; fatigue behavior; fatigue mechanism Abstract: As the ideal candidates for high temperature structural materials, carbon/carbon (C/C) composites are no doubt involved in fatigue loading.
However, the results of these studies were still few; these were insufficient to establish the design criteria for load-bearing structures.
Summary It has been accepted widely that C/C composites has high fatigue limit and fatigue enhancement function, but the study of fatigue behavior and enhancement mechanism were still insufficient, such as the fatigue behavior at the various fatigue cycles and stress level, and that the micro-structure of C/C composites is complex, C/C composites are made of the carbon fiber, carbon matrix, interface between fiber and matrix and pores.
Tension-tension fatigue behaviour of knitted fabric composites.Composits Structure, 2004, (64):199-209 [9] F Namiki, T W Chou.
Online since: February 2008
Authors: Wen Jian Weng, Yan Bao Li, Dong Xu Li
Results and Discussions The calcium phosphate precipitate has amorphous disorder structure due to its broad diffraction peak at about 2θ 30° in the XRD pattern (Fig. 1a) and unsplit peaks during 600-500 cm-1 in the FTIR spectrum (Fig. 2d), which indicates the ACP precursor can be prepared using synthetic polymer (PEG) as stabilizer in the mother solution as reported before [8, 9].
Biphasic tricalcium phosphate (BTCP) composite powders composed of can be prepared using the ACP precursor with different atomic structures, obtained by controlling the synthesis parameters of the ACP precursor [10].
Elliot, Structure and chemistry of the apatites and the other calcium orthophosphates (Elsevier Science B.V., Amsterdam, Netherlands, 1994)
Online since: March 2007
Authors: Young Soo Kang, Song Yi
Preparation of Hydrophilic Polymer Film by using γγγγ-Irradiation Method Song Yi and Young Soo Kanga Department of Chemistry, Pukyong National University, 599-1 Daeyon-3-Dong, Nam-gu, Pusan, 608-737, Korea a yskang@pknu.ac.kr Keywords:Hydrophobic polymer film, Polyethylene (PE), Grafting γ-irradiation, Maleic anhydride (MA) Abstract.
Polyethylene (PE) grafted with maleic an hydride (MA), MA-g-PE, exhibits enhanced compatibility in polymer alloys of PE with polar materials like cellulose and chitin [1], which are promising as new environmental protection plastics[2].However, the lack of well- confirmed experimental evidence has left obscure the molecular structure of MA groups grafted onto PE, mainly owing to the low graft degree.
The thermal structure and phase change of PE and grafted PE was examined by TGA analysis under air atmosphere at a heating rate of 10 oC/min.
And the structure of polyethylene grafted with maleic anhydride was elucidated by 1H NMR and 13C NMR spectroscopy. 1H NMR spectrum of grafted PE showed resonance only in the 2.0 - 3.0 ppm region and 13C NMR spectrum of MA grafted product indicated the resonance for methylene carbon � connected with -COOR is observed at 24 ppm in two methods of grafting.
Online since: May 2007
Authors: Ralf Riedel, Chang Sheng Li, Xue Yan, Xiao Nong Cheng, Ralf Hauser
Thus, dimensional change, porosity formation as well as material properties can be tailored in a wide range by combination of a variety of polymers, fillers and reaction atmospheres [5].The micro structure and the homogeneity of the as synthesized SiCN ceramic composites can be influenced by the particle size and the reactivity of the inserted metal powders.
The phase and crystal structure of composite were identified by Rigaku D/Max 2500 X-ray powder diffraction (XRD) with Cu Kα radiation.
The antiferromagnetic structure of the AF2 phase of Mn5Si3, stable between the Neel point at -174 o C and the transition to a second antiferromagnetic AF1 phase at -207 o C [9].
Vol.18(2003), p.2549 [7] Y.L.Li, E.Kroke, R.Riedel et al:Applied Organometallic Chemistry, Vol.15(2001), p.820 [8] L.A.Liew:Ph.D. thesis, University of Colorado, 2002, p.22 [9] P.J Brown, J.B.Forsyth: J.Phys.
Online since: October 2010
Authors: Jian Xin Cao, Bo Zhu, Fei Liu
Effect of Anion Impurity on Preparing Xonotlite Whiskers via Hydrothermal Synthesis Fei Liu a, Jianxin Caob and Bo Zhu School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550003, China ace.feiliu@gzu.edu.cn, bjxcao@gzu.edu.cn Keywords: xonotlite; whisker; anion impurity; hydrothermal synthesis Abstract.
Whisker possess extraordinary mechanical strength, excellent physical and chemical characters due to the perfect single crystal structure, which is called strengthening and toughening materials in 21 century.
According to the growth mechanism of xonotlite crystal, xonotlite crystals produce directly from C-S-H (calcium silicate hydrate) in the CaO-SiO2-H2O system[13], and then the different anion will be brought by different calcium sources, which would have different effects on the formation and structure of C-S-H.
Some irons are beneficial to the crystallization of xonotlite, or could be doped into the C-S-H and be favorable to the stabilization of C-S-H structure.