Stress enhanced gold dispersion by solvent induced crystallization in BPA-PC membranes |
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Authors: | Jacek K Stolarczyk Zbigniew J Grzywna |
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Affiliation: | a Department of Physical Chemistry and Technology of Polymers, Silesian University of Technology, Strzody 9, 44-100 Gliwice, Poland b Faculty of Engineering, Chair for Multicomponent Materials, Christian-Albrechts University, Kaiserstrasse 2, 24143 Kiel, Germany |
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Abstract: | In this paper the embedding of gold clusters in crystallizing bisphenol-A polycarbonate is treated as diffusion with drift in inhomogeneous and changing in time medium. Initially the gold is deposited on the polymer surface, which is subsequently exposed to acetone vapour. The polymer undergoes significant crystallization, induced by diffusing agent, while gold clusters become embedded in its bulk. The paper presents a model of gold dispersion based on Smoluchowski equation. It identifies the driving force of dispersion with the gradient of stress field generated during crystallization. Numerical results of the model are found to be in good agreement with available experimental data obtained by XPS depth profiling technique. |
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Keywords: | Vapour induced crystallization Gold dispersion Diffusion |
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