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Restricted Diffusion of Chromium Nitrate Salt Solutions into Porous Sol‐Gel‐Silica Monoliths
Author(s) -
Kunetz James,
Hench Larry
Publication year - 1998
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.1151-2916.1998.tb02422.x
Subject(s) - diffusion , chromium , porosity , chemical engineering , salt (chemistry) , materials science , porous medium , nitrate , sodium nitrate , mineralogy , inorganic chemistry , chemistry , analytical chemistry (journal) , chromatography , composite material , thermodynamics , metallurgy , organic chemistry , physics , engineering
The non‐steady‐state diffusion of chromium nitrate salt solutions into porous gel‐silica monoliths has been studied by optical absorption for a range of pore morphologies. The effective diffusion coefficient for the hexa‐aqua species decreases by 50 times the bulk diffusion coefficient for the smallest pore size investigated. These results indicate that pores smaller than the average pore size might be controlling the effective diffusion of chromium into the porous silica network or that additional forces, due to the smaller size of the pores, are contributing to the reduction of the ion's movement.