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Phase Separation in Sol–Gel Process of Alkoxide‐Derived Silica‐Zirconia in the Presence of Polyethylene Oxide
Author(s) -
Takahashi Ryoji,
Sato Satoshi,
Sodesawa Toshiaki,
Suzuki Kei,
Tafu Masamoto,
Nakanishi Kazuki,
Soga Naohiro
Publication year - 2001
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2001.tb00944.x
Subject(s) - materials science , mesoporous material , sol gel , spinodal decomposition , chemical engineering , cubic zirconia , zirconium , phase (matter) , porosity , amorphous solid , macropore , thermal stability , alkoxide , silica gel , monolith , oxide , chemistry , composite material , nanotechnology , organic chemistry , catalysis , ceramic , metallurgy , engineering
Phase separation in a sol–gel process of SiO 2 –ZrO 2 in the presence of polyethylene oxide is investigated. An amorphous gel with interconnected macroporous morphology is obtained when phase separation and sol–gel transition concur to fix a transitional structure of spinodal decomposition. Macropore size, together with connectivity of the pores and gel skeleton, can be controlled precisely by selecting an appropriate starting composition for preparation at a zirconium content ≤11.7 mol%. The macroporous gel retains additional mesopores <4 nm and exhibits typical bimodal pore size distribution. The addition of ZrO 2 in SiO 2 improves the thermal stability of both macroporous and mesoporous structures.