Issue 22, 2019

Contraction of polymer gels created by the activity of molecular motors

Abstract

We propose a theory based on non-equilibrium thermodynamics to describe the mechanical behavior of an active polymer gel created by the inclusion of molecular motors in its solvent. When activated, these motors attach to the chains of the polymer network and shorten them creating a global contraction of the gel, which mimics the active behavior of a cytoskeleton. The power generated by these motors is obtained by an ATP hydrolysis reaction, which transduces chemical energy into mechanical work. The latter is described by an increment of strain energy in the gel due to an increased stiffness. This effect is described with an increment of the cross-link density in the polymer network, which reduces its entropy. The theory then considers polymer network swelling and species diffusion to describe the transient passive behavior of the gel. We finally formulate the problem of uniaxial contraction of a slab of gel and compare the results with experiments, showing good agreement.

Graphical abstract: Contraction of polymer gels created by the activity of molecular motors

Article information

Article type
Paper
Submitted
22 Dec 2018
Accepted
15 May 2019
First published
21 May 2019

Soft Matter, 2019,15, 4467-4475

Author version available

Contraction of polymer gels created by the activity of molecular motors

M. Bacca, O. A. Saleh and R. M. McMeeking, Soft Matter, 2019, 15, 4467 DOI: 10.1039/C8SM02598C

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