Irreversible hardening of a colloidal gel under shear: The smart response of natural rubber latex gels.
Isotropic particles
Mechano-responsive gels
Re-structuring
Strain stiffening/hardening
Journal
Journal of colloid and interface science
ISSN: 1095-7103
Titre abrégé: J Colloid Interface Sci
Pays: United States
ID NLM: 0043125
Informations de publication
Date de publication:
15 Mar 2019
15 Mar 2019
Historique:
received:
06
09
2018
revised:
05
12
2018
accepted:
07
12
2018
pubmed:
28
12
2018
medline:
4
4
2019
entrez:
28
12
2018
Statut:
ppublish
Résumé
Natural rubber is obtained by processing natural rubber latex, a liquid colloidal suspension that rapidly gels after exudation from the tree. We prepared such gels by acidification, in a large range of particle volume fractions, and investigated their rheological properties. We show that natural rubber latex gels exhibit a unique behavior of irreversible strain hardening: when subjected to a large enough strain, the elastic modulus increases irreversibly. Hardening proceeds over a large range of deformations in such a way that the material maintains an elastic modulus close to, or slightly higher than the imposed shear stress. Local displacements inside the gel are investigated by ultrasound imaging coupled to oscillatory rheometry, together with a Fourier decomposition of the oscillatory response of the material during hardening. Our observations suggest that hardening is associated with irreversible local rearrangements of the fractal structure, which occur homogeneously throughout the sample.
Identifiants
pubmed: 30590236
pii: S0021-9797(18)31465-6
doi: 10.1016/j.jcis.2018.12.031
pii:
doi:
Substances chimiques
Colloids
0
Gels
0
Latex
0
Rubber
9006-04-6
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
287-296Informations de copyright
Copyright © 2018 Elsevier Inc. All rights reserved.