Preparation of low-density aerogels at ambient pressure

DM Smith, R Deshpande, C Jeffrey Brinke - MRS Online Proceedings …, 1992 - Springer
Low density aerogels have numerous unique properties which suggest a number of
applications such as ultra high efficiency thermal insulation. However, the commercial …

Drying of large monolithic aerogels between atmospheric and supercritical pressures

F Kirkbir, H Murata, D Meyers… - Journal of sol-gel science …, 1998 - Springer
The objectives of this investigation are to show the feasibility of producing large monoliths
with minimal shrinkage at subcritical conditions, and to understand the drying behavior …

Subcritical drying of silica gels

S Hæreid, E Nilsen, MA Einarsrud - Journal of Porous Materials, 1996 - Springer
Silica aerogel is a sol-gel prepared material characterized by high porosity and large inner
surface area. Aerogels can be prepared with a high transparency and low thermal …

Production of aerogels

B Rangarajan, CT Lira - The Journal of Supercritical Fluids, 1991 - Elsevier
Critical point drying of gels with carbon dioxide is used in the preparation of highly porous
silica monoliths. In this work, silica with a reproducible density of 0.2 g/cc is obtained …

Low-density, hydrophobic aerogels

KH Lee, SY Kim, KP Yoo - Journal of Non-Crystalline Solids, 1995 - Elsevier
Low-density, hydrophobic aerogels synthesis consisting of a two-step synthesis,
supercritical drying with liquid carbon dioxide and surface modification by vapor-phase …

Drying of aerogels in different solvents between atmospheric and supercritical pressures

F Kirkbir, H Murata, D Meyers, SR Chaudhuri - Journal of non-crystalline …, 1998 - Elsevier
Crack-free SiO2 aerogels were repeatedly dried with little shrinkage (< 2%) at subcritical
conditions by using various solvents as pore liquids. Gels dried in ethanol showed …

Aerogel processing

T Woignier, J Phalippou, F Despetis… - Handbook of Sol-Gel …, 2018 - amu.hal.science
One of the problems largely commented in the sol-gel science is how to make large bodies,
because gels tend to crack during drying. The drying stresses are attributed to capillary …

Drying of silica aerogel with supercritical carbon dioxide

MJ Van Bommel, AB De Haan - Journal of Non-Crystalline Solids, 1995 - Elsevier
For applications of monolithic silica aerogels, drying without cracking is an important issue.
By extracting alcohol with supercritical CO2, crack-free aerogels can be obtained at 35° C …

A reconsideration on the definition of the term aerogel based on current drying trends

JP Vareda, A Lamy-Mendes, L Durães - Microporous and Mesoporous …, 2018 - Elsevier
Kistler, in his original definition, stated that aerogels are obtained from gels in which the pore
liquid is replaced by air with moderate shrinkage of the matrix. However, aerogels have …

Drying of silica gels with supercritical carbon dioxide

MJ Van Bommel, AB De Haan - Journal of materials science, 1994 - Springer
Results of drying experiments of aerogels with supercritical carbon dioxide are reported. In
addition to the results of experiments with a pilot extracting apparatus, a preliminary design …