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Research Article | Open Access

Photorheological fluids of azobenzene polymers for lubrication regulation

Shuangxi TANG1, Shayu LI2, Liran MA1(), Yu TIAN1()
State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China
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Abstract

Fluid viscosity is ubiquitous property and is of practical importance in intelligent fluids, industrial lubrication, and pipeline fluid transportation. Recently, there has been a surging interest in viscosity regulation. Here, we have developed a group of photorheological fluids by utilizing azobenzene polymers with a light-induced microstructure transformation. In this work, a photosensitive polymer with 4,4'-bis-hydroxyazobenzene as the main chain was designed and synthesized as a pivotal functional material. The sufficiently large structural difference under ultraviolet and near-infrared light makes it possible to regulate the viscosity of a polyethylene glycol solution. The viscosity of the photosensitive rheological fluids under ultraviolet light radiation is found to be up to 45.1% higher than that under near-infrared light radiation. To explore this intelligent lubricating technology, the friction regulation of ceramic sliding bearings was investigated utilizing photosensitive rheological fluids. Reversible friction regulation with a ratio of up to 3.77 has been achieved by the alternative irradiation of near-infrared and ultraviolet light, which can be attributed to the differences in mechanical properties and molecular structures under ultraviolet and near-infrared light according to both simulations and experiments. Such photorheological fluids will have promising applications in controllable lubrication, intelligent rheological fluids, and photosensitive dampers.

Keywords

photorheological fluidsviscosityazobenzene polymerlubrication

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Friction
Volume 10 Issue 7,
July 2022
Pages 1078-1090
DOI: 10.1007/s40544-021-0529-x
Cite this article:
TANG S, LI S, MA L, et al. Photorheological fluids of azobenzene polymers for lubrication regulation. Friction, 2022, 10(7): 1078-1090. https://doi.org/10.1007/s40544-021-0529-x
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