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	Design and properties of self-assembled ordered films for nanolubrication
	Chen, Li2
	2014
关键词	Adhesion Energy dissipation Film preparation Friction Hydrogen bonds Molecular dynamics Molecules Multilayers Nanocomposite films Polymer films Self assembled monolayers Solid lubricants Structural properties Tribology Wear of materials Wear resistance Wetting Chemical compositions Design and construction Experimental investigations Frictional properties Micro-electro-mechanical Molecular dynamics simulations Self assembled multilayers Tribological properties
英文摘要	The rapid developments in microelectromechanical/nanoelectromechanical systems (MEMS/NEMS) and high-density storage technologies have dramatically increased the demand for ultrathin boundary lubricants, which can improve the tribological properties between contacting surfaces on micro- and nanoscales. Unfortunately, these miniaturized devices cannot be lubricated with conventional liquid lubricants. Molecular lubricants are considered to be prospective candidates to resolve the tribological problems of microdevices. This chapter focuses on designing and constructing self-assembled films and their frictional properties, including self-assembled monolayers, self-assembled multilayers, mixed monolayers, nanocomposite ultrathin films, and polymer thin films. Furthermore, the relationship between the structure and composition of self-assembled films and their frictional response are discussed in detail. Self-assembled films are ordered and densely packed molecular assemblies formed by chemical adsorption of active precursor molecules from solution onto solid surfaces. The interfacial properties of self-assembled films, such as adhesion, friction, wear, and wettability, are strongly influenced by their chemical composition, structure, assembly order, and packing density. The nature and strength of the binding forces between head groups and substrate surfaces dominate the stability and wear resistance of films. Results from experimental investigations and molecular dynamics simulations consistently show that molecules with longer alkyl chains can provide ordered and densely packed structures and enhance lateral interactions and, thus, exhibit improved frictional properties. Molecules with shorter chains tend to form disordered and less packed films, which possess poor frictional properties owing to the large amount of energy dissipation in the less ordered structures. Introducing functional groups into alkyl chains to form hydrogen bonds, dipole interaction, π-stacking, or covalent attachment, can construct robust films with enhanced mechanical and tribological stability. Surface terminal groups of the films control their wettability, adhesion force, friction force, and shearing force. Investigations on the self-organization and structure–property relationships will contribute to better design and construction of robust films with excellent frictional properties and loading-carrying capacity. © 2015 by Taylor & Francis Group, LLC.
语种	英语
页码	97-150
出处	Surfactants in Tribology
DOI标识	10.1201/b17691
卷号	4
出版者	CRC Press
内容类型	其他
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/118262]
专题	石油化工学院
作者单位	1.Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, China 2.College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, China;
推荐引用方式 GB/T 7714	Chen, Li. Design and properties of self-assembled ordered films for nanolubrication. 2014-01-01.

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