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MXene possesses great potential in enriching the functionalities of hydrogels due to its unique metallic conductivity, high aspect ratio, near-infrared light (NIR light) responsiveness, and wide tunability, however, the poor compatibility of MXene with hydrogels limits further applications. In this work, we report a uniformly dispersed MXene-functionalized poly-N-isopropylacrylamide (PNIPAM)/poly-2-acrylamido-2-methyl-1-propanesulfonic acid (PAMPS) double network hydrogel (M–DN hydrogel) that can achieve switchable friction regulation by using the NIR light. The dispersity of MXene in hydrogels was significantly improved by incorporating the chitosan (CS) polymer. This M–DN hydrogel showed much low coefficient of friction (COF) at 25 °C due to the presence of hydration layer on hydrogel surface. After illuminating with the NIR light, M–DN hydrogel with good photothermal effect rapidly raised the temperature to above the lower critical solution temperature (LCST), which led to an obvious increase of surface COF owing to the destruction of the hydration layer. In addition, M–DN friction control hydrogel showed good recyclability and controllability by tuning "on-off" of the NIR light. This work highlights the construction of functional MXene hydrogels for intelligent lubrication, which provides insight for interface sensing, controlled transmission, and flexible robotic arms.


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Achieving near-infrared-light-mediated switchable friction regulation on MXene-based double network hydrogels

Show Author's information Pengxi WU1Cheng ZENG1Jinglun GUO1Guoqiang LIU1( )Feng ZHOU1,2( )Weimin LIU1,2
Center of Advanced Lubrication and Sealing Materials, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China

Abstract

MXene possesses great potential in enriching the functionalities of hydrogels due to its unique metallic conductivity, high aspect ratio, near-infrared light (NIR light) responsiveness, and wide tunability, however, the poor compatibility of MXene with hydrogels limits further applications. In this work, we report a uniformly dispersed MXene-functionalized poly-N-isopropylacrylamide (PNIPAM)/poly-2-acrylamido-2-methyl-1-propanesulfonic acid (PAMPS) double network hydrogel (M–DN hydrogel) that can achieve switchable friction regulation by using the NIR light. The dispersity of MXene in hydrogels was significantly improved by incorporating the chitosan (CS) polymer. This M–DN hydrogel showed much low coefficient of friction (COF) at 25 °C due to the presence of hydration layer on hydrogel surface. After illuminating with the NIR light, M–DN hydrogel with good photothermal effect rapidly raised the temperature to above the lower critical solution temperature (LCST), which led to an obvious increase of surface COF owing to the destruction of the hydration layer. In addition, M–DN friction control hydrogel showed good recyclability and controllability by tuning "on-off" of the NIR light. This work highlights the construction of functional MXene hydrogels for intelligent lubrication, which provides insight for interface sensing, controlled transmission, and flexible robotic arms.

Keywords: near-infrared (NIR) light, friction modulation, MXene dispersion, photothermal hydrogel

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Received: 29 June 2022
Revised: 13 October 2022
Accepted: 21 November 2022
Published: 13 March 2023
Issue date: January 2024

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© The author(s) 2022.

Acknowledgements

We acknowledge the financial support from the National Natural Science Foundation of China (No. 52175187), the China Postdoctoral Science Foundation (2021M692625), and the Fundamental Research Funds for the Central Universities.

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