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Aqueous solution diffusion in hydrophobic nanoporous thin-film glasses

Published online by Cambridge University Press:  03 March 2011

Eric P. Guyer ,
Jay Gantz  and
Reinhold H. Dauskardt
Eric P. Guyer
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305
Jay Gantz
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305
Reinhold H. Dauskardt*
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305
*
c) Address all correspondence to this author. e-mail: dauskardt@stanford.edu
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Abstract

We demonstrate that diffusion of aqueous buffered solutions into strongly hydrophobic nanoporous methyl silsesquioxane glass films can occur without the application of external pressure. The organic component of these glasses in the form of methyl groups imparts the strong hydrophobicity and perception that they are impervious to the ingress of aqueous solutions by capillary action or diffusion. The presence of small concentrations of organic buffering agents in buffered solutions appears to facilitate the diffusion. The diffusion distance followed a square root of time dependence characteristic of Fick’s Law. The diffusion coefficients varied markedly with the concentration of buffering agents, solution pH, and temperature. Similar effects were not observed for nonbuffered solutions that exhibited no detectable diffusion. Likely mechanisms responsible for the observed behavior are proposed.

Keywords

DiffusionNanostructurePorosity
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 3 , March 2007 , pp. 710 - 718
Copyright
Copyright © Materials Research Society 2007

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References

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