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ACS Appl Mater Interfaces. 2019 Jun 5;11(22):20386-20393. doi: 10.1021/acsami.9b04463. Epub 2019 May 24.

Nanocomposite Hydrogels with Optic-Sonic Transparency and Hydroacoustic-Sensitive Conductivity for Potential Antiscouting Sonar.

Author information

1
Guangdong Provincial Key Laboratory on Functional Soft Condensed Matter , Guangdong University of Technology , Guangzhou , Guangdong 510006 , P. R. China.
2
Department of Ultrasound, West China Second University Hospital , Sichuan University , Chengdu , Sichuan 610041 , P. R. China.

Abstract

In this paper, we report on the design and simple fabrication of novel nanocomposite hydrogels with optic-sonic transparency and hydroacoustic-sensitive conductivity. The proposed nanocomposite hydrogels are constructed by poly( N, N-dimethylacrylamide) and exfoliated Laponite clay nanosheets via free radical polymerization. With lithium chloride (LiCl) as ionic additives inside the polymeric networks of the hydrogels, the lithium cations (Li+) could be stored on and in the clay nanosheets owing to the electrostatic adsorption and cation exchange. Triggered by hydroacoustic wave oscillation, the stored Li+ ions could escape from the clay nanosheets, resulting in the augmentation of ionic concentration inside the polymeric networks and thus the increase of the conductivity of the nanocomposite hydrogel. Inversely, upon removing the hydroacoustic signals, the Li+ ions could be readsorbed again by the clay nanosheets; as a result, the conductivity of the nanocomposite hydrogel decreases again. Moreover, the fabricated nanocomposite hydrogels also feature high stretchability and spliceable and antifreezing properties. Such novel nanocomposite hydrogels are highly promising for development of systems for camouflaging and sensing sonar scanning.

KEYWORDS:

hydroacoustic-sensitive conductivity; hydrogels; ionotronics; sensors; sonic transparency

PMID:
31094194
DOI:
10.1021/acsami.9b04463

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