Synthesis of nanoparticulate silica composite membranes by the pressurized sol-gel technique

Journal Article · Thu Dec 01 04:00:00 EST 1994 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1994.tb04554.x· OSTI ID:6608276

Hyun, S H; Kang, B S ^[1]

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1. Yonsei Univ., Seoul (Korea, Republic of). Dept. of Ceramic Engineering

A crack-free silica composite membrane has been synthesized from a nanoparticulate silica sol (particle diameter < 10 nm) by a pressurized sol-gel coating technique developed in this study. The microporous silica layers with an estimated pore radius of 0.78 nm were deposited inside the pores (average pore size of 0.1 [mu]m) of slip cast [alpha]-alumina support tubes. The microstructure of the coated layers was controlled by adjusting sol properties and pressurizing conditions. The room-temperature intrinsic permeability of N[sub 2] through the silica membrane layer after heat treatment at 200 C is about 4.9 [times] 10[sup [minus]12] mol[center dot]m/m[sup 2][center dot]s[center dot]Pa, and the mechanism of gas transport is Knudsen flow. The thermal stability of the silica composite membrane is excellent up to 500 C.

• OSTI ID: 6608276
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 77:12; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation &amp; Manufacture
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
COMPOSITE MATERIALS
DISPERSIONS
FABRICATION
MASS TRANSFER
MATERIALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PORE STRUCTURE
PRESSURIZATION
SILICON COMPOUNDS
SILICON OXIDES