منابع مشابه
Influence of Solvent on the Pore Structure and Activity of Pt-Sn/Alumino- Silicate Catalysts
Kaolinite supported bimetallic Pt-Sn catalysts were prepared via impregnation technique using different solvents, water, ethanol and acetone. The catalysts were characterized by X-ray diffraction pattern and temperature programmed reduction techniques. Surface area and pore size distribution were determined by nitrogen physisorption technique. The activities of the catalysts were measured towar...
متن کاملChemical Stability between NiCr2O4 Material and Molten Calcium-Magnesium-Alumino-Silicate (CMAS) at High Temperature
NiCr₂O₄ as a potential protection for thermal barrier coatings (TBCs) against the attack of molten calcium-magnesium-alumino-silicate (CMAS) was studied by a CMAS-contacting experiment. Atmospheric plasma sprayed coatings and sintered bulk materials were fabricated, covered with CMAS deposits, and exposed to 1200 °C for 24 h. Nano-sized CMAS-NiCr₂O₄ mixed powder was manufactured by ball milling...
متن کاملInvestigations on europium doped alumino-silicate xerogel incorporated in micro-channel glass and porous silicon
Porous materials in general have received great attention from the last century. The development of new porous materials and the preparation of new composites based on porous materials is a subject of interest. The development of porous silicon based optical composite materials opened up new ways of incorporating optically active sol-gel materials into porous silicon. High purity silica optical...
متن کاملA new route for preparation of sodium-silicate-based hydrophobic silica aerogels via ambient-pressure drying.
An in-depth investigation into the synthesis of hydrophobic silica aerogels prepared by the surface derivatization of wet gels followed by subsequent drying at ambient pressure is reported. The following sol-gel parameters were examined for their effect on the physical properties of the derived aerogels: number of gel washings with water, percentage of hexane or methanol in silylating mixture, ...
متن کاملInfluence of Chemical Conditions on the Nanoporous Structure of Silicate Aerogels
Silica or various silicate aerogels can be characterized by highly porous, open cell, low density structures. The synthesis parameters influence the three-dimensional porous structures by modifying the kinetics and mechanism of hydrolysis and condensation processes. Numerous investigations have shown that the structure of porous materials can be tailored by variations in synthesis conditions (e...
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ژورنال
عنوان ژورنال: Le Journal de Physique Colloques
سال: 1989
ISSN: 0449-1947
DOI: 10.1051/jphyscol:1989421