Issue 7, 2020

Polyelectrolyte complex-based self-healing, fatigue-resistant and anti-freezing hydrogels as highly sensitive ionic skins

Abstract

Self-healing polymeric hydrogels with high mechanical strength, excellent resilience and anti-freezing properties are fabricated for application as ionic skins with excellent and reliable sensing performances. The hydrogels are prepared by complexing polyacrylamide (PAAm) with polyacrylic acid (PAA) chelated with Fe3+ ions followed by shape processing and loading of NaCl salts. The loading of NaCl within the hydrogels can generate hydrophobic domains to enhance their mechanical strength and resilience and endow the hydrogels with ionic conductivity as high as ∼0.72 S m−1. Because of the synergy of hydrogen-bonding and coordination interactions as well as the hydrophobic domains, the resultant PAAm/PAA–Fe3+/NaCl hydrogels exhibit a high tensile strength of ∼1.18 MPa and excellent fatigue resistance. The PAAm/PAA–Fe3+/NaCl hydrogel-based ionic skins display quick, reversible and reliable resistance changes with a wide spectrum of strain (0.2–500%) and pressure (0.1–10 kPa) sensing capability. The sensing performance of the physically damaged and fatigued ionic skins can be conveniently restored by healing of the PAAm/PAA–Fe3+/NaCl hydrogels under mild conditions. Moreover, the loaded NaCl greatly decreases the freezing point of water entrapped within the PAAm/PAA–Fe3+/NaCl hydrogels to −24.7 °C, which allows the application of the ionic skins at subzero temperatures.

Graphical abstract: Polyelectrolyte complex-based self-healing, fatigue-resistant and anti-freezing hydrogels as highly sensitive ionic skins

Supplementary files

Article information

Article type
Paper
Submitted
03 Dis 2019
Accepted
22 Jan 2020
First published
22 Jan 2020

J. Mater. Chem. A, 2020,8, 3667-3675

Polyelectrolyte complex-based self-healing, fatigue-resistant and anti-freezing hydrogels as highly sensitive ionic skins

S. Li, H. Pan, Y. Wang and J. Sun, J. Mater. Chem. A, 2020, 8, 3667 DOI: 10.1039/C9TA13213A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements