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Microfluidic Preparation of Liquid Crystalline Elastomer Actuators

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Published on: May 20, 2018

Dynamic self-stiffening in liquid crystal elastomers.

Aditya Agrawal¹, Alin C Chipara, Yousif Shamoo

¹Department of Chemical and Biomolecular Engineering, Rice University, MS-362, 6100 Main Street, Houston, Texas 77005, USA.

Nature Communications

|April 25, 2013

Summary

This summary is machine-generated.

New liquid crystal elastomers significantly increase stiffness under dynamic compression. This adaptive stiffening, driven by a mobile director, offers potential for advanced self-healing and biocompatible materials.

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Area of Science:

Materials Science
Polymer Science
Biomaterials

Background:

Biological tissues possess adaptive remodeling capabilities.
Synthetic materials often lack the dynamic responsiveness of biological tissues.
Developing man-made materials that permanently increase stiffness under stress is challenging.

Purpose of the Study:

To investigate the stiffening response of polydomain nematic liquid crystal elastomers to dynamic compression.
To explore the influence of material composition and deformation type on elastomer stiffening.
To understand the underlying mechanism of dynamic compression-induced stiffening.

Main Methods:

Subjecting polydomain nematic liquid crystal elastomers to low-amplitude, repetitive compression.
Utilizing rheological measurements to quantify changes in stiffness.
Employing X-ray diffraction to analyze structural changes and director mobility.
Varying liquid crystal content and deformation conditions (dynamic vs. static).

Main Results:

Polydomain nematic liquid crystal elastomers exhibited up to a 90% increase in stiffness under dynamic compression.
Stiffening was dependent on liquid crystal content, the nematic phase, and dynamic deformation.
Rheological and X-ray diffraction data attributed stiffening to the rotation of a mobile nematic director.
This dynamic stiffening phenomenon was not previously observed in liquid crystal elastomers.

Conclusions:

Dynamic compression induces significant, reversible stiffening in nematic liquid crystal elastomers.
The mobile nematic director's response to dynamic stress is the key mechanism for stiffening.
This finding opens avenues for creating adaptive, self-healing, and biocompatible materials for tissue replacement applications.