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Title: Study of sol--gel processing for fabrication of hollow silica--aerogel spheres

Abstract

Preliminary results were previously reported indicating that uniform, hollow silica--aerogel spheres of controlled size and thickness can be fabricated by controlled hydrolysis and condensation of tetraethylorthosilicate (TEOS). The method consists of first producing a stream of hollow drops of a mixture of TEOS, H{sub 2}O, ethanol, and a catalyst using a dual-nozzle system and then introducing the drops into a gelation chamber where the drops solidify into a rigid form while being levitated by a gelation gas mixture. A detailed further study designed to understand and control the kinetics of the sol--gel processing that is responsible for the hollow silica--aerogel sphere formation is described. Specifically, the optimal rheology and stoichiometry of the reactant solution, the make-up of the gelation/levitation gas mixture, and the characteristics of the resulting silica--aerogel spheres, such as the size, thickness, porosity, pore size, and density, are investigated.

Authors:
;  [1]
  1. Fusion Technology Laboratory, University of Illinois, Urbana, IL (USA) Upadhye, R.S. (Lawrence Livermore National Laboratory, Livermore, CA (USA))
Publication Date:
OSTI Identifier:
6764725
Resource Type:
Journal Article
Journal Name:
Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA)
Additional Journal Information:
Journal Volume: 8:3; Journal ID: ISSN 0734-2101
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; SILICA; TARGETS; THERMONUCLEAR REACTIONS; FABRICATION; RHEOLOGY; STOICHIOMETRY; CHALCOGENIDES; MINERALS; NUCLEAR REACTIONS; NUCLEOSYNTHESIS; OXIDE MINERALS; OXIDES; OXYGEN COMPOUNDS; SILICON COMPOUNDS; SILICON OXIDES; SYNTHESIS; 700209* - Fusion Power Plant Technology- Component Development & Materials Testing

Citation Formats

Jang, K Y, and Kim, K. Study of sol--gel processing for fabrication of hollow silica--aerogel spheres. United States: N. p., 1990. Web. doi:10.1116/1.576839.
Jang, K Y, & Kim, K. Study of sol--gel processing for fabrication of hollow silica--aerogel spheres. United States. doi:10.1116/1.576839.
Jang, K Y, and Kim, K. Tue . "Study of sol--gel processing for fabrication of hollow silica--aerogel spheres". United States. doi:10.1116/1.576839.
@article{osti_6764725,
title = {Study of sol--gel processing for fabrication of hollow silica--aerogel spheres},
author = {Jang, K Y and Kim, K},
abstractNote = {Preliminary results were previously reported indicating that uniform, hollow silica--aerogel spheres of controlled size and thickness can be fabricated by controlled hydrolysis and condensation of tetraethylorthosilicate (TEOS). The method consists of first producing a stream of hollow drops of a mixture of TEOS, H{sub 2}O, ethanol, and a catalyst using a dual-nozzle system and then introducing the drops into a gelation chamber where the drops solidify into a rigid form while being levitated by a gelation gas mixture. A detailed further study designed to understand and control the kinetics of the sol--gel processing that is responsible for the hollow silica--aerogel sphere formation is described. Specifically, the optimal rheology and stoichiometry of the reactant solution, the make-up of the gelation/levitation gas mixture, and the characteristics of the resulting silica--aerogel spheres, such as the size, thickness, porosity, pore size, and density, are investigated.},
doi = {10.1116/1.576839},
journal = {Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA)},
issn = {0734-2101},
number = ,
volume = 8:3,
place = {United States},
year = {1990},
month = {5}
}