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Polymers 2017, 9(12), 722; https://doi.org/10.3390/polym9120722

Aerogels from Chitosan Solutions in Ionic Liquids

1
Grupo de Investigación en Biopolímeros—CTAOA. Centro de Investigación en Alimentación y Desarrollo, A.C., Hermosillo, Sonora 83304, Mexico
2
Polímeros Naturales. Centro de Investigación en Alimentación y Desarrollo, A.C., Unidad Guaymas, Guaymas, Sonora 85480, Mexico
*
Author to whom correspondence should be addressed.
Received: 16 November 2017 / Revised: 13 December 2017 / Accepted: 14 December 2017 / Published: 16 December 2017
(This article belongs to the Special Issue Advances in Chitin/Chitosan Characterization and Applications)
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Abstract

Chitosan aerogels conjugates the characteristics of nanostructured porous materials, i.e., extended specific surface area and nano scale porosity, with the remarkable functional properties of chitosan. Aerogels were obtained from solutions of chitosan in ionic liquids (ILs), 1-butyl-3-methylimidazolium acetate (BMIMAc), and 1-ethyl-3-methyl-imidazolium acetate (EMIMAc), in order to observe the effect of the solvent in the structural characteristics of this type of materials. The process of elaboration of aerogels comprised the formation of physical gels through anti-solvent vapor diffusion, liquid phase exchange, and supercritical CO2 drying. The aerogels maintained the chemical identity of chitosan according to Fourier transform infrared spectrophotometer (FT-IR) spectroscopy, indicating the presence of their characteristic functional groups. The internal structure of the obtained aerogels appears as porous aggregated networks in microscopy images. The obtained materials have specific surface areas over 350 m2/g and can be considered mesoporous. According to swelling experiments, the chitosan aerogels could absorb between three and six times their weight of water. However, the swelling and diffusion coefficient decreased at higher temperatures. The structural characteristics of chitosan aerogels that are obtained from ionic liquids are distinctive and could be related to solvation dynamic at the initial state. View Full-Text
Keywords: aerogels; chitosan; ionic liquids; ionogels aerogels; chitosan; ionic liquids; ionogels
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Santos-López, G.; Argüelles-Monal, W.; Carvajal-Millan, E.; López-Franco, Y.L.; Recillas-Mota, M.T.; Lizardi-Mendoza, J. Aerogels from Chitosan Solutions in Ionic Liquids. Polymers 2017, 9, 722.

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