AKIYAMA Yoshikatsu
   Department   Research Institutes and Facilities, Research Institutes and Facilities
   Position   Assistant Professor
Article types Original article
Language English
Peer review Peer reviewed
Title Effect of malic acid on structure of silicon alkoxide derived silica
Journal Formal name:Journal of Non-Crystalline Solids
Abbreviation:Non-Crystalline. Solids.
ISSN code:0022-3093
Domestic / ForeginForegin
Publisher Elsevier
Volume, Issue, Page 212(1),pp.40-48
Author and coauthor IZUTSU Hiroyuki, MIZUKAM Fujio, SASHIDA Takeshi, MAEDA Kazuyuki, KIYOZUMI Yoshimichi
Publication date 1997/05
Summary 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.
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