Friction is a fundamental force that impacts almost all interface-related applications.Over the past decade,there is a revival in our basic understanding and practical applications of the friction.In this review,we di...Friction is a fundamental force that impacts almost all interface-related applications.Over the past decade,there is a revival in our basic understanding and practical applications of the friction.In this review,we discuss the recent progress on solid–liquid interfacial friction from the perspective of interfaces.We first discuss the fundamentals and theoretical evolution of solid–liquid interfacial friction based on both bulk interactions and molecular interactions.Then,we summarize the interfacial friction regulation strategies manifested in both natural surfaces and artificial systems,focusing on how liquid,solid,gas,and hydrodynamic coupling actions mediate interfacial friction.Next,we discuss some practical applications that are inhibited or reinforced by interfacial friction.At last,we present the challenges to further understand and regulate interfacial friction.展开更多
Controllable friction regulation has drawn much interest in both scientific and industrial fields.And there have been many researches on friction regulation by many physical fields and chemical factors.Photo-sensitive...Controllable friction regulation has drawn much interest in both scientific and industrial fields.And there have been many researches on friction regulation by many physical fields and chemical factors.Photo-sensitive materials are promising because it is relatively easy to change their properties compared with others.Here,a new kind of photo-induced grease/oil switched lubricant is designed and shows great reversibility under ultraviolet(UV)and visible(Vis)irradiation.Its viscosity can change more than 50 times under different irradiation,and the coefficients of friction(COFs)obviously increase under Vis irradiation and decrease under UV irradiation,which performs better than those of the common grease.According to the experimental results,the phenomena are contributed to the break and reconstruction of the three-dimensional network inside the lubricant.With a switchable grease/oil state under different irradiation,this work provides a new principle for designing a smart lubricant with controllable friction regulation.展开更多
基金This work was supported by the funding from Health@InnoHK(Hong Kong Centre for Cerebro-cardiovascular Health Engineering(COCHE)),the Innovation and Technology Commission,the Government of the Hong Kong Special Administrative Region of the People’s Republic of China,the National Natural Science Foundation of China(12102250)China Postdoctoral Science Foundation(2020TQ0190 and 2020M681290).
文摘Friction is a fundamental force that impacts almost all interface-related applications.Over the past decade,there is a revival in our basic understanding and practical applications of the friction.In this review,we discuss the recent progress on solid–liquid interfacial friction from the perspective of interfaces.We first discuss the fundamentals and theoretical evolution of solid–liquid interfacial friction based on both bulk interactions and molecular interactions.Then,we summarize the interfacial friction regulation strategies manifested in both natural surfaces and artificial systems,focusing on how liquid,solid,gas,and hydrodynamic coupling actions mediate interfacial friction.Next,we discuss some practical applications that are inhibited or reinforced by interfacial friction.At last,we present the challenges to further understand and regulate interfacial friction.
基金supported by the National Natural Science Foundation of China(No.51527901).
文摘Controllable friction regulation has drawn much interest in both scientific and industrial fields.And there have been many researches on friction regulation by many physical fields and chemical factors.Photo-sensitive materials are promising because it is relatively easy to change their properties compared with others.Here,a new kind of photo-induced grease/oil switched lubricant is designed and shows great reversibility under ultraviolet(UV)and visible(Vis)irradiation.Its viscosity can change more than 50 times under different irradiation,and the coefficients of friction(COFs)obviously increase under Vis irradiation and decrease under UV irradiation,which performs better than those of the common grease.According to the experimental results,the phenomena are contributed to the break and reconstruction of the three-dimensional network inside the lubricant.With a switchable grease/oil state under different irradiation,this work provides a new principle for designing a smart lubricant with controllable friction regulation.
