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Issue 11, 2018
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Water desorption from a confined biopolymer

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We study desorption of water from a confined biopolymer (chitosan thin films) by employing temperature dependent specular X-ray reflectivity and spectroscopic ellipsometry. The water desorption is found to occur via three distinct stages with significantly different desorption rates. The distinct rates of water desorption are attributed to the presence of different kinds of water with disparate mobilities inside the biopolymer film. We identify two characteristic temperatures (Tc1 and Tc2) at which the water desorption rate changes abruptly. Interestingly, the characteristic temperatures decrease with decreasing the film thickness. The thickness dependence of the characteristic temperature is interpreted in the context of a higher mobility of polymer chains at the free surface for polymers under one-dimensional confinement.

Graphical abstract: Water desorption from a confined biopolymer

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The article was received on 27 Nov 2017, accepted on 09 Feb 2018 and first published on 09 Feb 2018

Article type: Paper
DOI: 10.1039/C7SM02332D
Citation: Soft Matter, 2018,14, 2163-2169
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    Water desorption from a confined biopolymer

    L. Pradipkanti and D. K. Satapathy, Soft Matter, 2018, 14, 2163
    DOI: 10.1039/C7SM02332D

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