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Liquid Crystal Polymer Networks and Elastomers for Light-Fueled Robotics

Research output: Chapter in Book/Report/Conference proceedingChapterScientificpeer-review

Details

Original languageEnglish
Title of host publicationPhotoactive Functional Soft Materials
EditorsQuan Li
PublisherJohn Wiley & Sons, Ltd
Pages197-226
Number of pages30
ISBN (Electronic)978-3-527-81677-4
ISBN (Print)978-3-527-34482-6
DOIs
Publication statusPublished - 19 Nov 2018
Publication typeA3 Part of a book or another research book

Abstract

Summary Liquid crystal (LC) polymer networks and elastomers are synthetic cross-linked polymer systems constituting liquid crystalline building blocks, or mesogens. This chapter provides an up-to-date overview of light- fueled LC network (LCN) robotics. It explains photoactuation and light robotics, and discusses the basic physics that a small-scale LCN robot encounters, as the forces at the microscale are very different from common everyday experience. The chapter also introduces the photoactuation mechanisms, making a comparison between photothermal and photochemical actuation strategies, which often times yield distinct actuation behavior and shape changes. Azobenzene-based photochemical actuators often times exhibit photoinduced bending as opposed to in-plane photocontraction. The chapter considers autonomous actuation, driven by dynamic light-response in the material, to adopt a significant role in the design of future LCN robots. Uniaxially aligned LCNs can undergo reversible contraction-expansion along the molecular director axis, thus presenting muscle-like motion under external stimulus.

Keywords

  • elastomers, light-fueled robotics, liquid crystal polymer networks, photochemical actuation, photothermal actuation, small-scale robots, soft micro-robotics, uniaxial contraction, uniaxial expansion

Publication forum classification

Field of science, Statistics Finland