Fast-response mechanism for regulating friction coefficients induced by microviscosity in polymer-based aqueous lubrication systems

Zhang, Caixia; Wang, Lihui; Liang, Weihao; Li, Ying; Cheng, Yanhong; Liu, Zhifeng; Liu, Mengmeng

doi:10.1016/j.apsusc.2024.159410

Cited by 1 publication

(3 citation statements)

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“…Knowledge of microviscosity is important in polymer-based lubrication systems [33]. A relationship between the change in microviscosity and the friction coefficient is established in [33]. η micro was measured with molecular rotors [33].…”

Section: Microviscosity Of Complex Liquidsmentioning

confidence: 99%

“…A relationship between the change in microviscosity and the friction coefficient is established in [33]. η micro was measured with molecular rotors [33]. In contrast to viscosity η, η micro enables a precise characterization of each component's diffusion and adsorption rates within the contact region at micro and nano scales.…”

Section: Microviscosity Of Complex Liquidsmentioning

confidence: 99%

“…Therefore, η micro exhibits a more rapid response, which is very important for studying polymer aqueous lubrication friction regulation systems and for revealing the friction coefficient's response to viscosity changes within the contact region and the underlying mutation mechanism. However, the existing mechanical viscosity measurement methods pose challenges when it comes to detecting η micro at polymer-modified interfaces [33].…”

Section: Microviscosity Of Complex Liquidsmentioning

confidence: 99%

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Fast Recombination of Free Radicals in Solution and Microviscosity

Khudyakov

2024

Physchem

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Rates of fast reactions are inversely proportional to the solvent viscosity (η). However, a quantitative study demonstrates that dynamic viscosity η is often a crude reflection of a viscous drug exerted on a molecule or radical. This paper aims to present an accurate dependence of the rates of fast bi- and monomolecular reactions upon the viscous drug of a media. Different correction coefficients fmicro are discussed, which should lead to a dependence rate ∝ (fmicroη)−1. Microviscosity is viscosity, leading to the expected rate dependence upon shear viscosity. In many cases, experimentally measured diffusion coefficients of molecules of a similar structure to the reactive radicals lead to the correct prediction of radicals’ diffusion coefficients and the rate constants of radicals recombination. Microviscosity of complex non-Newtonian liquids (biological liquids, polymeric solutions) can be measured using low MW molecular probes. Usually, the measured ηmicro is much lower than the shear η of complex biological or polymeric liquids. Cis–trans isomerization of bulky groups in monomolecular reactions is often described with Kramers’ theory. An example of such isomerization of a cyanine dye studied experimentally and theoretically is presented. It is demonstrated in the selected case that Kramers’ theory adequately describes the dependence of cis–trans isomerization of organic compounds upon η.

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Section: Microviscosity Of Complex Liquidsmentioning

confidence: 99%

Section: Microviscosity Of Complex Liquidsmentioning

confidence: 99%

Section: Microviscosity Of Complex Liquidsmentioning

confidence: 99%

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