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Printed hydrogel nanocomposites: fine-tuning nanostructure for anisotropic mechanical and conductive properties

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journal contribution
posted on 19.11.2020, 14:56 by Weiwei Zhao, Lijin Chen, Sanming Hu, Zhijun Shi, Xing Gao, Vadim SilberschmidtVadim Silberschmidt
Additive manufacturing of composites offers a potential for a new level of control over a material’s structure at the microscale. The focus of this work is a 2-hydroxyethyl methacrylate (HEMA)–based gelation system with orderly distributed carbon nanotubes (CNTs). CNTs undergo shear-induced alignment during printing process, and retain their orientation after the polymerisation of HEMA monomers, thereby, forming a nanocomposite with anisotropic mechanical and electrical properties. It is characterised with an intensive programme of mechanical tests including quasistatic uniaxial stretching, and dynamic cyclic loadings, as well as its four-terminal sensing of conductive characteristics. A coupling effect of mechanical and electrical properties is also studied. The experimental findings are discussed in detail and demonstrate that the orientation of CNTs affects both the mechanical and electrical conductive properties of the nanocomposites in terms of its ultimate strength, resistivity, and a piezoresistive coefficient. Understanding of anisotropic electromechanical properties of printed PHEMA-CNT hydrogel nanocomposite will ultimately underpin the development of smart soft materials for diverse applications, such as biomimetic nucleus pulposus or flexible electronics.

Funding

National Natural Science Foundation of China (51703176, 91848102)

Fundamental Research Funds for the Central Universities (WUT2018IVB006)

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Advanced Composites and Hybrid Materials

Volume

3

Issue

3

Pages

315 - 324

Publisher

Springer

Version

AM (Accepted Manuscript)

Rights holder

© Springer

Publisher statement

This is a post-peer-review, pre-copyedit version of an article published in Advanced Composites and Hybrid Materials. The final authenticated version is available online at: https://doi.org/10.1007/s42114-020-00161-5

Acceptance date

11/06/2020

Publication date

2020-07-24

Copyright date

2020

ISSN

2522-0128

eISSN

2522-0136

Language

en

Depositor

Prof Vadim Silberschmidt Deposit date: 16 November 2020