Superchaotropic Nano-ion Binding as a Gelation Motif in Cellulose Ether Solutions.
Cellulose
Chaotropic Effect
Hydrogel
Polyoxometalate
Superchaotropic
Journal
Angewandte Chemie (International ed. in English)
ISSN: 1521-3773
Titre abrégé: Angew Chem Int Ed Engl
Pays: Germany
ID NLM: 0370543
Informations de publication
Date de publication:
16 01 2023
16 01 2023
Historique:
received:
12
07
2022
pubmed:
9
11
2022
medline:
12
1
2023
entrez:
8
11
2022
Statut:
ppublish
Résumé
Nanometer-sized anions (nano-ions) like polyoxometalates and boron clusters exhibit so-called superchaotropic behavior, which describes their strong binding to hydrated non-ionic matter in water. We show here that nano-ions, at millimolar concentrations, dramatically enhance the viscosity and induce gelation of aqueous solutions of non-ionic cellulose ethers (CEs), a class of widely utilized polymers known for their thickening and gel-forming ability. These phenomena arise from an interplay of attractive forces and repulsive electrostatic forces between CE-chains upon nano-ion binding. The attractive forces manifest themselves as aggregation of CE-chains into a physically crosslinked polymer network (gel). In turn, the electrostatic repulsions hamper the viscosity increase and gelation. Superchaotropic nano-ion binding emerges as a novel and general physical crosslinking motif for CE-solutions and exceeds by far the conventional thickening effects of classical salts and ionic surfactants.
Identifiants
pubmed: 36346946
doi: 10.1002/anie.202210208
pmc: PMC10107358
doi:
Substances chimiques
Cellulose
9004-34-6
Ether
0F5N573A2Y
Polymers
0
Water
059QF0KO0R
Ethyl Ethers
0
Ethers
0
Solutions
0
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
e202210208Informations de copyright
© 2022 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH.
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