Abstract

Switchable lubrication materials have great potential in the preparation of intelligent grabbing devices, tissue materials, and intelligent soft robots. In nature, numerous living organisms can dynamically change their frictional behaviors. Inspired by the lubrication to the astringency of the oral cavity, mucin was incorporated with poly(vinyl alcohol) (PVA) to emulate this behavior from an ultra-low friction state to a high friction state. The results show that mucin allows for the reduction in coefficient of friction by 95.8 % relative to mucin-free hydrogels. Furthermore, large-scale switchable lubrication (μ∼0.009 to μ∼0.47) is achieved through the interaction between mucin and tannic acid (TA). The approach may offer a method for preparing intelligent grabbing devices, tissue materials, and intelligent soft robots.

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