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Issue 14, 2017
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Direct observation of orientation distributions of actin filaments in a solution undergoing shear banding

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Abstract

Shear banding is frequently observed in complex fluids. However, the configuration of macromolecules in solutions undergoing shear banding has not yet been directly observed. In this study, by using the fact that F-actin solutions exhibit shear banding and actin filaments are visualized by fluorescent labels, we directly observed the intrinsic states of an actin solution undergoing shear banding. By combining the 3D imaging of labeled actin filaments and particle image velocimetry (PIV), we obtained orientation distributions of actin filaments in both high and low shear rate regions, whose quantitative differences are indicated. In addition, by using the orientation distributions and applying stress expression for rod-like polymers, we estimated stress tensors in both high and low shear rate regions. This evaluation indicates that different orientation distributions of filamentous macromolecules can exhibit a common shear stress.

Graphical abstract: Direct observation of orientation distributions of actin filaments in a solution undergoing shear banding

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Publication details

The article was received on 20 Dec 2016, accepted on 15 Mar 2017 and first published on 16 Mar 2017


Article type: Paper
DOI: 10.1039/C6SM02832B
Citation: Soft Matter, 2017,13, 2708-2716
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    Direct observation of orientation distributions of actin filaments in a solution undergoing shear banding

    K. Sato, I. Kunita, Y. Takikawa, D. Takeuchi, Y. Tanaka, T. Nakagaki and H. Orihara, Soft Matter, 2017, 13, 2708
    DOI: 10.1039/C6SM02832B

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