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Online since: February 2008
Authors: Zhi Wang, Guo Pu Shi, Xiang Sun, Xian Qin Hou
Since the increase of fiber content leads to the fiber
aggregation in the composites, less pore structure generates and the relative density of composites
0 2 4 6 8 10
75
80
85
90
95
100
Relative density of alumina (% )
CMS content (wt%)
TiO2
0. 0%
0.5%
1.0%
1.5%
Fig. 1 Alumina ceramic relative density
vs. the contents of CMS and TiO2
Fig. 2 Crystal appearance of alumina
ceramic
1400 1450 1500 1550
75
80
85
90
95
100
Composites relative density (%)
Sintered temperature(℃ )
10%
15%
20%
25%
30%
(a)
1400 1450 1500 1550
200
300
400
500
Flexural strength (MPa)
Sintered temperatuer (℃ )fiber content
0%
10%
15%
20%
25%
30%
(a)
Fig. 3 Effect of sintering temperature and fiber
content on composites relative density
Fig. 4 Effect of sintering temperature and fiber
content on composites flexural strength
decrease [7].
The possible reason for this is the fibers are more difficultly to disperse uniformly in matrix with the increasing content of fiber, and the fibers introduces pore structure that generate stress concentration [8].
Lu: Silicate Physical Chemistry (Wuhan University of Technology Publications, Wuhan 1996) [7] M.J.
The possible reason for this is the fibers are more difficultly to disperse uniformly in matrix with the increasing content of fiber, and the fibers introduces pore structure that generate stress concentration [8].
Lu: Silicate Physical Chemistry (Wuhan University of Technology Publications, Wuhan 1996) [7] M.J.
Online since: May 2004
Authors: Paul-Henri Duvigneaud, T. Lucion, A. Laudet, J.F. Stenger, E. Gueguen
Phase structure
and microstructure were examined by XRD and by SEM-EDX on polished sample surfaces.
As the lowest eutectic of the MgO-TiO2 system is at 1620°C, the promoting effect of Ti at <1500°C as well as the inhibiting one at ≥ 1500°C is thus related to a solid state process involving point defects arising from the Ti dissolution in the rock-salt structure of MgO.
Petric : Materials Chemistry and Physics 46, 23-30 (1996)
As the lowest eutectic of the MgO-TiO2 system is at 1620°C, the promoting effect of Ti at <1500°C as well as the inhibiting one at ≥ 1500°C is thus related to a solid state process involving point defects arising from the Ti dissolution in the rock-salt structure of MgO.
Petric : Materials Chemistry and Physics 46, 23-30 (1996)
Online since: September 2013
Authors: Yasumasa Tomita, Kenkichiro Kobayashi, Yasuhisa Maeda, Makoto Morishita, Takayoshi Okada, Sahara Sahara, Atsushi Ichikawa, Shin’ichi Ishimaru, Yoshiumi Kohno
Preparation and Characterization of Mesoporous Silica and Lithium-ion-conductive Halocomplex Salt Composite
Yasumasa Tomita1, a, Makoto Morishita1, Takayoshi Okada1, Hiromi Sahara1, Atsushi Ichikawa1, Shin’ichi Ishimaru2, Yoshiumi Kohno1, Yasuhisa Maeda1 and Kenkichiro Kobayashi1
1Department of Materials Science and Chemical Engineering, Faculty of Engineering, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu, Shizuoka 432-8561, Japan
2Department of Green and Sustainable Chemistry, Tokyo Denki University, 5 Senju Asahi-cho, Adachi-ku, Tokyo 120-8551, Japan
a tytomit@ipc.shizuoka.ac.jp
Keywords: Solid electrolyte, Mesoporous silica, Ionic conduction, Halocomplex salt
Abstract.
In order to achieve higher ion conductivity in a crystalline solid electrolyte, it is important the structure is appropriate for ion conduction and to control the size of the lattice.
It is supposed that the Li-ion, categorized as a hard acid, has many features, such as crystal structure, coordinating atoms and interstitial site stability, which limit its ionic conductivity.
In order to achieve higher ion conductivity in a crystalline solid electrolyte, it is important the structure is appropriate for ion conduction and to control the size of the lattice.
It is supposed that the Li-ion, categorized as a hard acid, has many features, such as crystal structure, coordinating atoms and interstitial site stability, which limit its ionic conductivity.
Online since: January 2012
Authors: Jian Zhao, Yong Sun, Bao Hong Li, Min Yao Tan, Bin Li
The whole mixer structure is a perfectly symmetrical column, so the mixer is simplified into a two-dimensional model in which two nozzles impinging mutually.
(3) The impinging jet mixer will be wide used due to its simple structure and good performance in the mixing aspect.
Computers and Applied Chemistry, 2003,20(4):423-426 [5] Li Weifeng, Sun Zhigang, Liu Haifeng: Numerical simulation and experimental study on flow field of two closely spaced opposed jets[J].
(3) The impinging jet mixer will be wide used due to its simple structure and good performance in the mixing aspect.
Computers and Applied Chemistry, 2003,20(4):423-426 [5] Li Weifeng, Sun Zhigang, Liu Haifeng: Numerical simulation and experimental study on flow field of two closely spaced opposed jets[J].
Online since: June 2011
Authors: Grant McAdam, Parama Chakraborty Banerjee, R.K. Singh Raman, Yvonne Durandet
Suitable tailoring of the surface microstructure and/or chemistry is a common approach for improving the corrosion resistance of a susceptible metal/alloy.
Since the scan rate used for producing sample 2 was faster than that for sample 1, the cooling rate would be more rapid in the case of sample 2 and hence the degree of microstructural refinement achieved in this case was greater than that for sample 1. 10 µm (b) 10 µm (c) 10 µm (a) Fig. 1 Back scattered electron image of the top surface of ZE41 alloy: (a) without laser treatment, (b) sample 1 and (c) sample 2 (Refer Table 1 for laser parameters used to treat samples 1 and 2) The intermetallic particles throughout the laser treated zone of both the samples had a highly refined structure and were distributed along the grain boundaries forming a continuous network like structure.
Since the scan rate used for producing sample 2 was faster than that for sample 1, the cooling rate would be more rapid in the case of sample 2 and hence the degree of microstructural refinement achieved in this case was greater than that for sample 1. 10 µm (b) 10 µm (c) 10 µm (a) Fig. 1 Back scattered electron image of the top surface of ZE41 alloy: (a) without laser treatment, (b) sample 1 and (c) sample 2 (Refer Table 1 for laser parameters used to treat samples 1 and 2) The intermetallic particles throughout the laser treated zone of both the samples had a highly refined structure and were distributed along the grain boundaries forming a continuous network like structure.
Online since: November 2011
Authors: Sandrine Lépinay, Guillaume Laffont, Giséle Volet, Véronique Wintgens, Pierre Ferdinand, Benjamin Carbonnier, Marie Claude Millot
Introduction
An important scientific and technological challenge in analytical science deals with the development of sensors and their applications in areas such as environmental monitoring, biotechnology, medical diagnostics, drug screening, food safety...[1] Sensors with optical detection method have been largely discussed in the literature including fluorescence spectroscopy, interferometry, spectroscopy of modes guided in optical waveguide structures and surface plasmon resonance spectroscopy. [2-4]
Surface engineering involves the modification of materials at the molecular scale to design interface with well-defined surface functionality providing advanced physical and (bio)chemical properties.
The layer-by-layer or LbL self-assembly method allows fabricating molecularly controlled ultrathin multilayer films through the alternate deposition of polycations and polyanions from solution. [5] By controlling the solution parameters, surface charges, and polymer combination, various supramolecular structures have been developed.
Compared with conventional covalent chemistry, the cyclodextrin-based sensing layer made with this self-assembly method presents the advantage of easy control of the layer thickness and the ease of surface regeneration. [6] The biosensor based on a Tilted Fiber Bragg Grating (TFBG) refractometer which enables direct detection, in real-time, of target molecules.
The layer-by-layer or LbL self-assembly method allows fabricating molecularly controlled ultrathin multilayer films through the alternate deposition of polycations and polyanions from solution. [5] By controlling the solution parameters, surface charges, and polymer combination, various supramolecular structures have been developed.
Compared with conventional covalent chemistry, the cyclodextrin-based sensing layer made with this self-assembly method presents the advantage of easy control of the layer thickness and the ease of surface regeneration. [6] The biosensor based on a Tilted Fiber Bragg Grating (TFBG) refractometer which enables direct detection, in real-time, of target molecules.
Online since: May 2003
Authors: Paul Allen Williams, D.D. Green, Ian C. Clarke, Besim Ben-Nissan, Giuseppe Pezzotti
Ben-Nissan
3
1 Peterson Tribology Lab, Department of Orthopaedic Surgery, Loma Linda University Medical
Center, Loma Linda, California USA, pwilliams@som.llu.edu
2
Department of Materials, Kyoto Institute of Technology, Kyoto, Japan
3
Department of Chemistry, Materials, and Forensic Science, University of Technology, Sydney,
Australia
Keywords: Zirconia, water lubrication, serum lubrication, wear surface, wear debris, clinical
Abstract.
The debris particles were larger than would be expected and exhibited a monoclinic structure.
Y-TZP zirconia is a metastable structure that can go from its desirable tetragonal phase to monoclinic.
The debris particles were larger than would be expected and exhibited a monoclinic structure.
Y-TZP zirconia is a metastable structure that can go from its desirable tetragonal phase to monoclinic.
Online since: April 2007
Authors: He Xin Zhang, Xiao Hong Zhang, Ying Jie Qiao, Chang Qing Hong
Microstructure and Properties of Carbon-Ceramic Composite
Prepared by Hot-Pressing Sintering
Yingjie Qiao1, Hexin Zhang2, Xiaohong Zhang1 and Changqing Hong2
1
Mechanics & Electronics Engineering School, Harbin Engineering University, Harbin 150001,
China
2
Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001,
China
Keywords: Recrystallized graphite; dopant Cr; electrical resistivity
Abstract.
The microstructure transforms gradually from pure structure to fine fragments.
Walker: Chemistry and physics of carbon (New York, Marcel Ddkker, 1971), p.83
The microstructure transforms gradually from pure structure to fine fragments.
Walker: Chemistry and physics of carbon (New York, Marcel Ddkker, 1971), p.83
Online since: September 2014
Authors: Min Seon Lee, Hoon Jung Oh, Joo Hee Lee, In Geun Lee, Woo Gon Shin, Sung Yong Kang, Dae Hong Ko
The physical structures of the 8nm-thick HfO2 gate stacks were observed using transmission electron microscopy (TEM) measurements.
Based on these observations, it can be said that fluorine atoms were incorporated into the HfO2 films by NF3/NH3 dry cleaning and the incorporated fluorine atoms affect the chemistry fo IL between HfO2 and Si.
The physical structure was analyzed using TEM to understand the effect of the NF3/NH3 dry cleaning.
Based on these observations, it can be said that fluorine atoms were incorporated into the HfO2 films by NF3/NH3 dry cleaning and the incorporated fluorine atoms affect the chemistry fo IL between HfO2 and Si.
The physical structure was analyzed using TEM to understand the effect of the NF3/NH3 dry cleaning.
Online since: July 2011
Authors: Zheng Ming Tong, Shu Jun Liang
However, the huge cost of building the infra-structure will be the barrier to realize.
Z., Concept of aluminum hydrogen energy industry, Russian Journal of General Chemistry, 2007
[4] Bououdina, M., Grant, D.and Walker, G, Review on hydrogen absorbing materials— Structure, microstructure, and thermodynamic properties, Int.
Z., Concept of aluminum hydrogen energy industry, Russian Journal of General Chemistry, 2007
[4] Bououdina, M., Grant, D.and Walker, G, Review on hydrogen absorbing materials— Structure, microstructure, and thermodynamic properties, Int.