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Title: Chitosan-xanthan gum PEC-based aerogels: A chemically stable PEC in scCO2
Authors: Tomé, Luciana I. N. 
Reis, Marco S. 
Sousa, Hermínio C. de 
Braga, Mara E. M. 
Keywords: Polyelectrolyte complexes; Aerogels; DOE; Supercritical-drying; Xanthan gum; Chitosan
Issue Date: 2022
Publisher: Elsevier
Project: POCI-01-0145-FEDER-032625 
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB/04539/2020/PT 
Serial title, monograph or event: Materials Chemistry and Physics
Volume: 287
Abstract: An innovative aerogel obtained from a chitosan/xanthan gum polyelectrolyte complex (PEC) was developed in this work from the screening of thirteen different combinations of natural polyelectrolytes: two positively charged biopolymers (chitosan and gelatin A), six negatively-charged biopolymers (pectin, iota-carrageenan, collagen, xanthan gum, alginate and modified galactomannan), and a neutral polymer (guar gum) using the statistical design of experiments (DOE) approach. Only the chitosan-xanthan gum formed aerogels under supercritical conditions using carbon dioxide at 150 bar and 250 bar and 35 ◦C. The chitosan-xanthan gum-based aerogels have bone-like structures and smooth surfaces, with pore size distributions in the meso- and macropore ranges, the average pore diameter of ~20 nm and porosity between 60 and 70%. The specific surface areas of the aerogels processed at 150 bar and 250 bar are, respectively, 5.7 and 17.5 m2 g− 1, values below those commonly reported in the literature for aerogels. The aerogels are thermally stable up to ~240 ◦C, while the cryogel is thermally stable up to ~224 ◦C. The value of the total weight loss through thermal decomposition of the aerogels (~25%) is smaller than that of the cryogel (~40%). These materials have potential applications in the environmental and biomedical areas, providing solutions to the current challenges in biomedicine and social, demographic and sanitary life sciences.
ISSN: 02540584
DOI: 10.1016/j.matchemphys.2022.126294
Rights: embargoedAccess
Appears in Collections:I&D CIEPQPF - Artigos em Revistas Internacionais

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