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Cationic hydrophobicity promotes dissolution of cellulose in aqueous basic solution by freezing-thawing
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. South China University of Technology, Guangzhou, China.
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2018 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 20, no 20, p. 14223-14233Article in journal (Refereed) Published
Abstract [en]

The physical dissolution of cellulose in aqueous solutions of tetramethyl ammonium hydroxide, triethylmethyl ammonium hydroxide, tetraethyl ammonium hydroxide, benzyltrimethyl ammonium hydroxide, benzyltriethyl ammonium hydroxide, NaOH and LiOH via freezing-thawing was investigated. Increasing the hydrophobicity of the cation greatly improved its dissolution capacity, leading to significant enhancement of cellulose solubility and stability against chain aggregation and gelation. The hydrophobic cations accumulated at the cellulose interface and decreased the surface tension, favouring dispersion of the disintegrated cellulose due to its amphiphilicity; this was consistent with molecular dynamics simulations. On the other hand, the solubility of cellulose followed the Hofmeister series, and cations with greater kosmotropicity originating from their greater hydrophobicity exhibited stronger dissolution power; this observed interaction pattern may be useful for further exploration and designation of novel solvents of cellulose. These aqueous quaternary ammonium hydroxides can be readily recycled and reused, which .

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2018. Vol. 20, no 20, p. 14223-14233
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Physical Sciences Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-230053DOI: 10.1039/c8cp01268gISI: 000433262300055Scopus ID: 2-s2.0-85047617889OAI: oai:DiVA.org:kth-230053DiVA, id: diva2:1216802
Funder
Knut and Alice Wallenberg Foundation
Note

QC 20180612

Available from: 2018-06-12 Created: 2018-06-12 Last updated: 2018-06-27Bibliographically approved

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