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Reactive Jetting of High Viscosity Nanocomposites for Dielectric Elastomer Actuation

Malas, Asish; Saleh, Ehab; Giménez‐López, Maria del Carmen; Rance, Graham A.; Helps, Tim; Taghavi, Majid; Rossiter, Jonathan M.; Tuck, Christopher J.; Ashcroft, Ian A.; Goodridge, Ruth D.

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Authors

Asish Malas

Ehab Saleh

Maria del Carmen Giménez‐López

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GRAHAM RANCE Graham.Rance@nottingham.ac.uk
Senior Research Fellow

Tim Helps

Majid Taghavi

Jonathan M. Rossiter

CHRISTOPHER TUCK CHRISTOPHER.TUCK@NOTTINGHAM.AC.UK
Professor of Materials Engineering

IAN ASHCROFT IAN.ASHCROFT@NOTTINGHAM.AC.UK
Professor of Mechanics of Solids

RUTH GOODRIDGE Ruth.Goodridge@nottingham.ac.uk
Professor of Additive Manufacturing



Abstract

The layer-by-layer nature of additive manufacturing is well matched to the layer construction of stacked dielectric actuators, with inkjet printing offering a unique opportunity due to its droplet-on-demand capability, suitable for multi-material processing at high resolution. This paper demonstrates the use of high viscosity, multi-material jetting to deposit two-part reactive inks with functionalized nanofillers to digitally manufacture dielectric elastomers for soft robots with high precision, and shape manipulation. Graphene-based fillers, including graphene oxide (GO) and thermally reduced graphene oxides (TRGOs), have been incorporated into a polydimethylsiloxane (PDMS) matrix at low loading (below the percolation threshold). Consequently, the dielectric constant of the elastomer dramatically increases (by 97%) compared to neat PDMS, yielding a more than 20-fold increase in the electric-field induced electromechanical contraction (from 0.3 to 6.7%). This study shows that the oxygen-functionalities present in GO and TRGOs, which possess a moderate conductivity, improve the dispersion of those fillers in polymer matrices, thus significantly improving the dielectric constant of the polymer composites. Inkjet printing of high-performance, soft electroactive composites enables high-speed, reliable fabrication of monolithic artificial muscles (leading to stronger, cheaper, and more capable soft robotic devices) and provides a vital stepping stone towards fully additively manufactured soft robots.

Journal Article Type Article
Acceptance Date Dec 11, 2021
Online Publication Date Jan 17, 2022
Publication Date 2022-06
Deposit Date Feb 23, 2022
Publicly Available Date Feb 23, 2022
Journal Advanced Materials Technologies
Electronic ISSN 2365-709X
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 7
Issue 6
Article Number 2101111
DOI https://doi.org/10.1002/admt.202101111
Keywords Industrial and Manufacturing Engineering; Mechanics of Materials; General Materials Science
Public URL https://nottingham-repository.worktribe.com/output/7355298
Publisher URL https://onlinelibrary.wiley.com/doi/full/10.1002/admt.202101111

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