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Professor Yan Feng's group at Soochow University: Antifreeze skin based on polyionic liquid hydrogel
2019-12-30 Source: Polymer Technology

In recent years, flexible sensors capable of converting external stimuli into electrical signals have shown great development prospects in artificial intelligence fields such as wearable devices, electronic skins, and soft robots. Hydrogels are widely used in ionic skin and other fields due to their good biocompatibility, conductivity and stretchability. Due to the freezing of water molecules, the traditional hydrogel artificial skin inevitably loses its self-healing properties, transparency, conductivity and stretchability below zero. Therefore, it is of great significance to research and prepare a hydrogel that has good biocompatibility and can maintain stretchability and high conductivity at low temperature.

Figure 1. Chemical structure of polyionic liquid antifreeze hydrogel

Professor Yan Feng's group at Suzhou University recently synthesized an amphoteric polyionic liquid and used it to prepare antifreeze hydrogels. -1 )以及自修复性。 Due to the strong dipolar action between the amphoteric ionic liquid unit and the water molecule, the prepared polyionic liquid hydrogel still has good stretchability (~ 900%) and electrical conductivity ( 1.1 S at -20 ℃). m -1 ) and self-healing. The molecular dynamics simulation was used to further study the interaction between water molecules and the main chain of the zwitterionic ionic liquid-containing polymer at low temperature. Based on this gel, a multi-mode ionic skin was designed including capacitance, resistance, and triboelectric sensing. By combining with a flexible mechanical gripper, the performance of the polyionic liquid gel in different environments was tested.

Figure 2. Rheological, tensile, electrical conductivity, and self-healing tests of polyionic liquid hydrogels at low temperatures.

Capacitive mode

Resistance mode

Triboelectric mode

Figure 3. Polyionic liquid hydrogel soft manipulator

In the capacitive mode, the ion skin can use the change in capacitance generated by the deformation to identify the pressure; in the resistive mode, the temperature is used to promote and suppress the movement of the ions to sense the rise and fall of the temperature; in the triboelectric mode, due to different Materials have different triboelectric coefficients, so they can be used to distinguish between materials.

Liu Ziyang (Suzhou University) and Wang Yue (University of Illinois at Urbana-Champaign) are co-first authors.

Papers published: Z. Liu, Y. Wang, Y. Ren, G. Jin, C. Zhang, W. Chen, F. Yan *, Poly (ionic liquid) Hydrogel-based Anti-freezing Ionic Skin for Soft Robotic Gripper, Mater. Horiz. 2019, DOI: 10.1039 / C9MH01688K.

http://doi.org/10.1039/C9MH01688K

Copyright and Disclaimer: Original article from China Polymer Network. For reprinting of publications or media, please contact the email address : info@chevronsz.com , and please indicate the source.
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