所属 研究施設 研究施設 職種 講師
|表題||Effect of malic acid on structure of silicon alkoxide derived silica|
|掲載誌名||正式名：Journal of Non-Crystalline Solids|
略 称：Non-Crystalline. Solids.
|著者・共著者||IZUTSU Hiroyuki, MIZUKAM Fujio, SASHIDA Takeshi, MAEDA Kazuyuki, KIYOZUMI Yoshimichi|
|概要||The effect of malic acid on specific surface area, pore size distribution and gel structure of sol-gel derived silica gels was investigated. Tetraethoxysilane (TEOS) used as starting material was modified with malic acid prior to hydrolysis. The specific surface area of calcined gels increased and the pore size distribution shifted to smaller values and became sharper with an increase in malic acid. Malic acid affected particle size and the extent of condensation due to its acidity and condensation hindrance. Under high malic acid concentrations particulate gels were formed. Malic acid chemically bonded or adsorbed to silica polymers prevented particle growth and condensation among particles. Gels obtained at above malic acid/TEOS = 1.17 (mol/mol) and calcined at 450°C for 3 h showed high specific surface areas about 1000 m2 g−1. The gel had uniform mesopores with around 2 nm radius.|