4.7 Article

Irreversible hardening of a colloidal gel under shear: The smart response of natural rubber latex gels

Journal

JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 539, Issue -, Pages 287-296

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2018.12.031

Keywords

Isotropic particles; Strain stiffening/hardening; Mechano-responsive gels; Re-structuring

Funding

  1. CNPq, National Council for Scientific and Technological Development - Brazil

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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. (C) 2018 Elsevier Inc. All rights reserved.

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