DataVXACS Applied Polymer MaterialsPaper
journal article·2021-03-12

A Dual-Responsive, Freezing-Tolerant Hydrogel Sensor and Related Thermal- and Strain-Sensitive Mechanisms

Yonggan Yan, Luxing Wei, Xiaoyong Qiu, Jinlong Shao, Hanlian Liu, Xin Cui, Jun Huang, Lei Xie, Zhenfeng Hu, Chuanzhen Huang

ACS Applied Polymer Materials· Volume 3· Issue 3
Publisher page
Source abstract

Abstract

Freezing-tolerant and conductive hydrogels have attracted tremendous interest as promising materials for flexible sensors under the gelid condition. In this work, a freezing-tolerant, dual-responsive hydrogel sensor was developed by using an ionic–glycerol hybrid hydrogel. The fabricated hydrogel sensor was demonstrated to detect efficiently different temperatures ranging from −30 to 100 °C or to detect both small strains (e.g., 1%, 2%, 4%) and large strains (e.g., 10%, 20% and 30%) as a freezing-tolerant strain sensor. A systematic investigation was conducted to explore the thermal- and strain-sensitive mechanisms of the obtained hydrogel. It was found that the resistance of the hydrogel rapidly increased as the temperature (T) decreased. In addition, the strain sensitivity increased as T decreased from 0 °C to −30 °C. Surprisingly, an abrupt resistance increase was observed when the tensile strain of the gel reached a critical value (e.g., 2620% at 0 °C) or upon moving the hydrogel from 25 to −10 to −30 °C. Such a sharp increase in resistance was found to be mainly caused by the abrupt fracture of a vast amount of the inner hydrogel network at large strains or the appearance of microcrystals in the gel network at low temperatures. This work provides fundamental and practical insights into fabricating functional freezing-tolerant hydrogel sensors for engineering applications.
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Research context

Polymers

OpenAlex topics: Advanced Sensor and Energy Harvesting Materials · Advanced Materials and Mechanics · Hydrogels: synthesis, properties, applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Center for Advanced Jet Engineering Technologies (CaJET), Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan, Shandong 250061, China

Key Laboratory of Colloid and Interface Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong 250100, China

Department of Periodontology, School and Hospital of Stomatology, Shandong University & Shandong Provincial Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, Shandong 250012, China

Advanced Interdisciplinary Technology Research Center, National Innovation Institute of Defense Technology, Beijing, 100071, China

Advanced Medical Research Institute, Shandong University, Jinan, Shandong 250012, China

Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada

Funding

National Natural Science Foundation of China · Natural Science Foundation of Shandong Province · Jinan Medicine and Health Science Technology Project · Open Foundation of Advanced Medical Research Institute, Shandong University

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