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

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

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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 ℃ 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.

MXene dispersionphotothermal hydrogelnear-infrared(NIR)lightfriction modulation

Pengxi WU、Cheng ZENG、Jinglun GUO、Guoqiang LIU、Feng ZHOU、Weimin LIU

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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

National Natural Science Foundation of ChinaChina Postdoctoral Science FoundationFundamental Research Funds for the Central Universities

521751872021M692625

2024

10.1007/s40544-022-0726-2

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CSTPCD北大核心EI
ISSN：2223-7690
年,卷(期)：2024.12(1)
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