オキシナイトライドガラスの構造と性質に関する研究

京都大学0048新制・論文博士博士(工学)乙第8065号論工博第2664号新制||工||898(附属図書館)UT51-93-B337(主査)教授 作花 濟夫, 教授 吉田 鄕弘, 教授 曽我 直弘学位規則第4条第2項該当Doctor of EngineeringKyoto UniversityDFA

Electrochromic response of WO3 and WO3-TiO2 thin films prepared from water-soluble precursors and a block copolymer template

Electrochromic tungsten trioxide (WO3) thin films are attracting renewed attention as transmittance-controllable windows for use in automobile, aircraft, and building applications. In order to achieve high electrochromic performance, high cycle stability, and high reliability, the microstructure and compositional homogeneity of WO3 thin films have to be optimized. In this study, non-doped WO3 and TiO2-doped WO3 thin films were fabricated from water-soluble precursors of tungsten and titanium, and their electrochromic response was investigated. Amorphous WO3 and TiO2-doped WO3 thin films were fabricated by calcining the spin-coated films at 573 K. The use of a PEO-PPO-PEO block copolymer as a porogen facilitated the redox reactions occurring on the thin film/electrolyte interface. Although the effect of TiO2-doping on the cycle stability of WO3 thin films has not been fully elucidated, this study demonstrated that TiO2 doping up to 15 mol% effectively enhanced the cycle stability

Water Resistance of Porous Carbon Materials made from Rice Hull

The authors have investigated a new utilizationof rice-hull from a viewpoint of the recycling. The rice-hull carbon-material (RHS carbon) is manufactured by mixing the rice-hull particles with a phenol resin, pressure forming, drying, and then carbonizing in the temperature range from 1173K to 1773K. Since the most of the inorganic component is Siin the rice hull, the most of the produced inorganic component in the RHS carbon is SiO2, which is stable under wet or water-ret conditions. Therefore, the RHS carbon is expected to be a high water-resistant material. In this study, the authors measure the compressive strength of the RHS carbon after water immersing and hygroscopic expansion in a deionized water. The compressive strength did not decrease after the water immersing. Moreover, the hygroscopic expansion of the RHS carbon was considerably low. These results clearly showed the advantage of the RHS carbon, comparing to the similar porous carbon materials made from rice bran