BAND FORMATION DURING GASEOUS-DIFFUSION IN AEROGELS

Authors
EINARSRUD MA MAAO FA HANSEN A KIRKEDELEN M SAMSETH J
Citation
Ma. Einarsrud et al., BAND FORMATION DURING GASEOUS-DIFFUSION IN AEROGELS, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 57(6), 1998, pp. 6767-6773
Citations number
16
Categorie Soggetti
Physycs, Mathematical","Phsycs, Fluid & Plasmas
Journal title
Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics → ACNP
ISSN journal
1063651X
Volume
57
Issue
6
Year of publication
1998
Pages
6767 - 6773
Database
ISI
SICI code
1063-651X(1998)57:6<6767:BFDGIA>2.0.ZU;2-J
Abstract
We study experimentally how gaseous HCl and NH3 diffuse from opposite sides of and react in silica aerogel rods with a porosity of 92% and a n average pore size of about 50 nm.The reaction leads to solid NH4Cl, which is deposited in thin sheetlike structures. We present a numerica l study of the phenomenon. Due to the difference in boundary condition s between this system and those usually studied, we find the sheetlike structures in the aerogel to differ significantly from older studies. The influence of random nucleation centers and inhomogeneities in the aerogel is studied numerically.