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This is an early access version, the complete PDF, HTML, and XML versions will be available soon. Open AccessArticle by *, , and Faculty of Science and Engineering, Swansea University, Swansea SA1 8EN, UK * Author to whom correspondence should be addressed.
3.1 Water and ethanol uptake As can be seen in Figures 1 and 2, standard Fickian diffusion does not seem to have been followed for the uptake of water, however, an interesting three-stage diffusion mechanism was detected for water and ethanol. All samples displayed an initial quick diffusion rate but then followed a slower increase in the water uptake in the second stage before leveling out in the third stage, potentially indicating saturation.
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