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Formation of Colloidal Nanocellulose Glasses and Gels
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0002-1402-2679
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0001-8622-0386
2017 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 33, no 38, p. 9772-9780Article in journal (Refereed) Published
Abstract [en]

Nanocellulose (NC) suspensions can form rigid volume-spanning arrested states (VASs) at very low volume fractions. The transition from a free-flowing dispersion to a VAS can be the result of either an increase in particle concentration or a reduction in interparticle repulsion. In this work, the concentration-induced transition has been studied with a special focus on the influence of the particle aspect ratio and surface charge density, and an attempt is made to classify these VASs. The results show that for these types of systems two general states can be identified: glasses and gels. These NC suspensions had threshold concentrations inversely proportional to the particle aspect ratio. This dependence indicates that the main reason for the transition is a mobility constraint that, together with the reversibility of the transition, classifies the VASs as colloidal glasses. If the interparticle repulsion is reduced, then the glasses can transform into gels. Thus, depending on the preparation route, either soft and reversible glasses or stiff and irreversible gels can be formed.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2017. Vol. 33, no 38, p. 9772-9780
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-215815DOI: 10.1021/acs.langmuir.7b01832ISI: 000411918500030PubMedID: 28853581Scopus ID: 2-s2.0-85029917620OAI: oai:DiVA.org:kth-215815DiVA, id: diva2:1149962
Note

QC 20171017

Available from: 2017-10-17 Created: 2017-10-17 Last updated: 2017-10-17Bibliographically approved

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Wågberg, Lars

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