MorphologiesControlled Synthesis and Optical Properties of Bismuth Tungstate
Lijin Xie, Junfeng Ma,1' Jun Zhou, and Zhongqiang Zhao College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266003, China Hua Tian, Yonggang Wang, Jiantao Tao, and Xiaoyi Zhu Institute of Materials Science and Engineering, Ocean University of China, Qingdao 266003, China Well-crystallized bismuth tungstate Bi2W06 powders with different morphologies were successfully synthesized via a low-temperature molten salt method. The powders were characterized by X-ray...
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Fig. 5. Change of friction coefficient with sliding distance in sample. some of the worn debris to form the so-called transfer films. Microscopic examination of the friction track revealed the presence of debris within the wear track. Two types of debris were identified individual rounded particles and more or less dense agglomerates forming flakes or platelets.11 The EDX analysis of debris indicated some traces of oxygen besides silicon. This indicates that the intergranular oxide phases,...
Sintering Nanocrystal Ostwald
sample of wormhole-like tungsten oxide exhibited an Hl-type isotherm,19 which is a kind of type IV and presents a mesoporous wormhole-like structure. The hysteresis loop of the isotherm was an H2 type of type IV curve when the tungsten oxide was calcined at 250 C. The mesopore collapsed and exhibited H3-type isotherms with slit-shaped pores during the calcination process at 500 C, and even yielded little hysteresis loop of the isotherm when the sample was calcined at 750 C. The detailed...
Synthesis of Nanophased Metal Oxides in Supercritical Water Catalysts for
Caroline Levy, Masaru Watanabe, Yuichi Aizawa, and Hiroshi Inomata Research Center of Supercritical Fluid Technology, Tohoku University, Sendai 980-8579, fapan Department of Applied Molecular Chemistry, College of Industrial Technology, Nihon University, Chiba 275-8575, fapan Nanoparticles of zinc oxide-based materials ZnO, Z11AI2O4 with various morphologies were synthesized in supercritical water SCW with a flow-type apparatus and in sub- and supercritical water with a batch reactor. In the...
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4J. Echeberria, J. Tarazona, J. Y. He, T. Butler, and F. Castro, Sinter-HIP of Alpha-Alumina Powders with Sub-Micron Grain Sizes,11 Eur. Ceram. Soc., 22, 1801-9 2002 . 5N. Saito, S. Matsuda, and T. Ikegami, Fabrication of Transparent Yttria Ceramics at Low Temperature Using Carbonate-Derived Powder, J. Am. Ceram. Soc., 81, 2023-8 1998 . 6T. Shiono, R. Sato, H. Shiomi, T. Minagi, and T. Nishida, Synthesis and Characterization of Forsterite Precursor Effects of Milling Precursors on Its...
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Fig. 6. Hardness and toughness as a function of added WC. increases. In Fig. 1, inner and outer rims formed in such a manner are observed for 20-40 wt WC. In the case of the high amounts of WC, in other words, less T C,N , the same procedure occurs. Initially, Ti C,N dissolves in the Ni binder to form an inner rim phase with WC. After most of the Ti C,N participates in forming a solid solution with WC, the remaining WC phase begins to form a different solid solution with the inner rim phase...
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To aid the discussion the pH is also indicated. To aid the discussion the pH is also indicated. tions of about 62 . Only at long times 180 days does the polymerization of both kinds of samples reach almost similar values 76 -77 . Secondly, we would like to draw attention to the clear correlation between the MCLs and the mechanical properties. Similar to the compressive strengths, the MCLs of the R samples are clearly longer than those of N samples at 28 and 90 days. However, as it occurs for...
Synthesis of High Density and Transparent Forsterite Ceramics Using NanoSized
Satoru Sano, Noriko Saito, Shin-ichi Matsuda, Naoki Ohashi, and Hajime Haneda National Institute for Materials Science, Ibaraki 305-0044, Japan Ube Material Industries Ltd., Yamaguchi 755-8510, Japan Department of Applied Chemistry, Kanagawa Institute of Technology, Kanawaga 243-0292, Japan Forsterite Mg2Si04 ceramics were prepared using Mg OH 2 and Si02 as precursors, and the effect of powder characteristics of Mg OH 2 on calcination and sintering was investigated. The use of highly dispersed...
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0 1 0.000 0 50 100 150 200 250 300 Optimal Temperature C Fig. 2. Graph of thermally induced voltage and sensitivity factor against optimal temperature for thick film resistors with 15wt of glass. ation lt 1 . and the average particle size is 10 nm 2 nm . For tin dioxide, all peaks belong to tin oxide phase Sn02 21-1250, 29-1484 JCPDS file numbers with the dominant presence of a tetragonal phase with an average particle size of 12 nm 2nm . Figure 3 presents the bulk XRD pattern of thick films...
MMVF10 Fibers
Histopathologicai pictures that show induction of an immune response in the form of granuloma against foreign fibers. Fibers are engulfed by phagocytic cells, such as macrophages and neutrophils, as an attempt to clear the irritant. HT fibers after a 2, b 7 c 30 and d 90 d and MMVF10 fibers after e 2, f 7, g 30 and h 90 d. fiber counts and histopathological gradation of the tissue response and correlate it with in-vitro dissolution rates. Before beginning the histopathological studies, fibers...
Future Developments
Much progress in concrete science is to be expected in conning years by the adaptation of new knowledge generated by a quickly growing field of nanotechnology.The development of the following concrete-related nanoproducts can be anticipated Catalysts for the low-temperature synthesis of clinker and accelerated hydration of conventional cements Grinding aids for superfine grinding and mechanochemical activation of cements Binders reinforced with nanoparti-cles, nanorods, nanotubes including...
Introduction Dhb
Hydroxyapatite HAp is a mineral and the major inorganic component of human bone and tooth. Solid or porous HAp ceramics have been used as hard tissue repairing materials in clinic. Zittle et al. reported protein adsorption onto calcium phosphates in 1951Since then, hydroxyapatite has also been used as a column packing material for chromatography to separate proteins or enzymes2'3'4. Recently, much attention has been focused on it as an adsorbent for removing pathogenic proteins from blood in...
Concrete with Nanoparticles
Mechanical properties of cement mortars with nano-iron-oxide and nanosilica were studied by Li et al.38 Experimental results demonstrated an increase in compressive and flex-ural strengths of mortars that contained nanoparticles. It was found that increased nanosilica content improved the strength of the mortars. Ultrafine fumed silica particles observed using JEM.37 Courtesy Andri Vital, EMPA Mat'ls Testing amp Research, laboratory for High-Performance Ceramics, Duebendorf, Switzerland....
Introduction
Although nanotechnology is still an emerging industry, it represents a huge potential in a variety of markets that include biomedical, electronics, and energy. For example, according to one market analyst, the market for nano-enabled electronics will reach over 82 billion in 2011. Some of these applications include memory products, nanosensors, and display technology. Biomedical applications is another promising area, with powders and composites being developed for orthopedic implants and other...
Energy And The Environment
Preparation and Characterization of Samaria-Doped Ceria Electrolyte Materials for Solid Oxide Fuel Cells 199 J. Am. Ceram. Soc., Vol. 91, No. 1, p. 127-131, 2008 Design of High-Quality Pt-Ce02 Composite Anodes Supported by Carbon Black for Direct Methanol 205 M. Takahashi, T. Mori, F. Ye, A. Vinu, H. Kobayashi, and J. Drennan J. Am. Ceram. Soc., Vol. 90, No. 4, p. 1291-1294, 2007 Rapid Formation of Active Mesoporous Ti02 Photocatalysts via Micelle in a Microwave Hydrothermal 209 H.-W. Wang,...
Sensors
Prussian Blue Nanoparticles Encapsulated Within Ormosil Film 277 CESP, Vol. 28, No. 8, p. 109-124, 2008 High-Yield Synthesis of Nanocrystalline Tin Dioxide by Thermal Decomposition for Use in Gas Sensors 293 Int. J. ofAppl. Ceram. Technol., Vol. 5, No. 2, p. 181-187, 2008 Effect of Firing Temperature on Electrical and Gas-Sensing Properties of Nano-Sn02-Based Thick-Film 301 Resistors Int. J. ofAppl. Ceram. Technol., Vol. 4, No. 5, p. 446-452, 2007 Preparation of Ru-C Nano-Composite Films and...