Fabrication of soft, stimulus-responsive structures with sub-micron resolution via two-photon polymerization of poly(ionic liquid)s

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Title: Fabrication of soft, stimulus-responsive structures with sub-micron resolution via two-photon polymerization of poly(ionic liquid)s
Authors: Tudor, A
Delaney, C
Zhang, H
Thompson, AJ
Curto, VF
Yang, GZ
Higgins, MJ
Diamond, D
Florea, L
Item Type: Journal Article
Abstract: Soft, stimulus-responsive 3D structures created from crosslinked poly(ionic liquid)s (PILs) have been fabricated at unprecedented sub-micron resolution by direct laser writing (DLW). These structures absorb considerable quantities of solvent (e.g., water, alcohol, and acetone) to produce PIL hydrogels that exhibit stimulus-responsive behavior. Due to their flexibility and soft, responsive nature, these structures are much more akin to biological systems than the conventional, highly crosslinked, rigid structures typically produced using 2-photon polymerization (2-PP). These PIL gels expand/contract due to solvent uptake/release, and, by exploiting inherited properties of the ionic liquid monomer (ILM), thermo-responsive gels that exhibit reversible area change (30 ± 3%, n = 40) when the temperature is raised from 20 °C to 70 °C can be created. The effect is very rapid, with the response indistinguishable from the microcontroller heating rate of 7.4 °C s−1. The presence of an endoskeleton-like framework within these structures influences movement arising from expansion/contraction and assists the retention of structural integrity during actuation cycling.
Issue Date: 1-Oct-2018
Date of Acceptance: 1-Aug-2018
URI: http://hdl.handle.net/10044/1/63170
DOI: https://dx.doi.org/10.1016/j.mattod.2018.07.017
ISSN: 1369-7021
Publisher: Elsevier Ltd
Start Page: 807
End Page: 816
Journal / Book Title: Materials Today
Volume: 21
Issue: 8
Copyright Statement: © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ )
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/L014149/1
Keywords: Science & Technology
Materials Science, Multidisciplinary
Materials Science
03 Chemical Sciences
09 Engineering
Publication Status: Published
Online Publication Date: 2018-08-29
Appears in Collections:Faculty of Engineering
Division of Surgery
Faculty of Medicine

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