Issue 13, 2020

Filler size effect in an attractive fibrillated network: a structural and rheological perspective

Abstract

The effect of the filler size on the structural and mechanical properties of an attractive fibrillated network composed of oxidised cellulose nanofibrils (OCNF) in water was investigated. Silica nanoparticles with a diameter of ca. 5 nm (SiNp5) and and ca. 158 nm (SiNp158) were chosen as non-interacting fillers of the OCNF network. These filler sizes were chosen, respectively, to have a particle size which was either similar to that of the network mesh size or much larger than it. Contrast matched small angle neutron scattering (SANS) experiments revealed that the presence of the fillers (SiNp5 and SiNp158) did not perturb the structural properties of the OCNF network at the nanometer scale. However, the filler size difference strongly affected the mechanical properties of the hydrogel upon large amplitude oscillatory shear. The presence of the smaller filler, SiNp5, preserved the mechanical properties of the hydrogels, while the larger filler, SiNp158, allowed a smoother breakage of the network and low network recoverability after breakage. This study showed that the filler-to-mesh size ratio, for non-interacting fillers, is pivotal for tailoring the non-linear mechanical properties of the gel, such as yielding and flow.

Graphical abstract: Filler size effect in an attractive fibrillated network: a structural and rheological perspective

Supplementary files

Article information

Article type
Paper
Submitted
01 Nov 2019
Accepted
28 Jan 2020
First published
02 Mar 2020
This article is Open Access
Creative Commons BY license

Soft Matter, 2020,16, 3303-3310

Filler size effect in an attractive fibrillated network: a structural and rheological perspective

V. Calabrese, M. A. da Silva, L. Porcar, S. J. Bryant, K. M. Z. Hossain, J. L. Scott and K. J. Edler, Soft Matter, 2020, 16, 3303 DOI: 10.1039/C9SM02175B

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