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Revealing Viscoelastic Bending Relaxation Dynamics of Isolated Semiflexible Colloidal Polymers by Simon G. Stuij; Hannah J. Jonas; Zhe Gong; Stefano Sacanna; Thomas E. Kodger; Peter G. Bolhuis; Peter Schall is a Materials Science article available to read on EtoBox.

What is Revealing Viscoelastic Bending Relaxation Dynamics of Isolated Semiflexible Colloidal Polymers about?

The viscoelastic properties of filaments and biopolymers play a crucial role in soft and biological materials from biopolymer networks to novel synthetic metamaterials. Colloidal particles with specific valency allow mimicking polymers and more complex molecular structures at the colloidal scale, offering direct observation of their internal degrees of freedom. Here, we elucidate the time-dependent viscoelastic response in the bending of isolated semi-flexible colloidal polymers, assembled from dipatch colloidal particles by reversible critical Casimir forces. By tuning the patch-patch interaction strength, we adjust the polymers' viscoelastic properties, and follow spontaneous bending modes and their relaxation directly on the particle level. We find that the elastic response is well described by that of a semiflexible rod with persistence length of order 1000 μm, tunable by the critical Casimir interaction strength. We identify the viscous relaxation on longer timescales to be due to internal friction, leading to a wavelength-independent relaxation time similar to single biopolymers, but in the colloidal case arising from the contact mechanics of the bonded patches. These tunable

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Author

Simon G. Stuij; Hannah J. Jonas; Zhe Gong; Stefano Sacanna; Thomas E. Kodger; Peter G. Bolhuis; Peter Schall

Publisher

Royal Society of Chemistry (RSC)

Published

2021

Language

EN

Field

Materials Science (Physical Sciences)