厚膜分子润滑-纳米技术手册-第5册

书籍目录

缩略语 Part E厚膜分子润滑 38.超薄非晶碳薄膜的纳米摩擦技术 38.1 常见沉积技术描述 38.2 化学和物理镀膜的特征 38.3 微机械和摩擦学镀膜的特征 38.4 结论 参考文献 39.纳米摩擦技术和表面保护的自组装单分子膜 39.1 背景 39.2 有机化学入门 39.3 自组装单分子膜：分子链中的基片、隔链、端基 39.4 自组装单分子膜的接触角和纳米摩擦特性 39.5 总结 参考文献 40.纳米边界润滑研究 40.1 边界薄膜 40.2 纳米形变、分子结构、外延和纳米摩擦研究 40.3 新兴全氟聚醚润滑薄膜的纳米摩擦学、电学、化学降解研究和环境影响 40.4 离子液体薄膜的纳米摩擦学和电学研究 40.5 结论 参考文献

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《Springer手册精选系列•纳米技术手册:厚膜分子润滑(第5册)(第3版影印版)》是非常实用的跨学科工具书，可供从事或即将从事这一领域研究的研究人员、科学家和工程师参考，也可供教学人员和研究生、高年级本科生使用。施普林格的手册一贯全面阐述基础理论，提供可靠的研究方法和关键知识以及大量的参考文献，介绍最新的应用实例，前瞻学科的发展方向。手册作者多为世界首席专家或知名学者。手册具有极大的实用性，其表格、图示、索引等更增加了它的使用价值。

内容概要

编者：（美国）布尚（Bharat Bhushan）

章节摘录

版权页：   插图：   Solid films are also commonly used for controlling hydrophobicity and／or adhesion，stiction，friction，and wear.Hydrophobic films have nonpolar surface terminal groups（to be described later）which repel water.These films have low surface energy（15—31）dyn／cm）and high contact angle（θ≥90°）which minimize wetting（e.g.，（39.25，28，29））.Multimolecularly thick（few tenths of nm）films of conventional solid lubricants have been studied.Hansma et al.（39.30）reported the deposition of multimolecularly thick，highly oriented polytetrafluoroethylene（PTFE）films from the melt or vapor phase or from solution by a mechanical deposi tion technique by dragging the polymer at controlled temperature，pressure，and speed against a smooth glass substrate.Scandella et al.（39.31）reported that the coefficient of nanoscale friction of MoS2 platelets on mica，obtained by the exfoliation of lithium intercalated MoS2 in water，was a factor of 1.4 less than that of mica itself.However，MoS2 is reactive to water，and its friction and wear propertieS degrade with increasing humidity（39.14.15）.Amorphous diamond-like carbon （DLC）coatings can be produced with extremely high hardness and are used commercially as wear-resistant coatings（39.32，33）.They are widely used in magnetic storage devices（39.2）.Doping of the DLC matrix with elements such as hydrogen，nitrogen，oxygen，Silicon，and fluorine influences their hydrophobicity and tribological properties（39.32，34.35）.Nitrogen and oxygen reduce the contact angle（or increase the surface energy）due to the strong polarity formed when these elements bond to carbon.On the other hand，silicon and fluorine increase the contact angle to 70-100°（or reduce the surface eriergy to 20-40dyn／cm），making them hydrophobic（39.36，37）.Nanocomposite coatings with a diamond－like carbon（a－C：H）network and a glasslike a-Si：O network are generally deposited using a plasma—enhanced chemical vapor deposition（PECVD）technique in which plasma is formed from a siloxane precursor using a hot filament.For fluori nated DLC，CF4 is added as the fluorocarbon source to an acetylene plasma.In addition，fluorination of DLC can be achieved by postdeposition treatment of DLC coatings in CF4 plasma.Silicon-and fluorine-containing DLC coatings mainly reduce their polarity due to the loss of sp2 bonded carbon（due to the polarization potential of the involved π electrons）and dangling bonds of the DLC network.As silicon and fluorine are unable to form double bonds，they force carbon into a sp3 bonding state（39.37）.Friction and wear properties of both silicon-containing and fluorinated DLC coatings have been reported to be superior to those of conventional DLC coatings（39.38，39）.However，DLC coatings require a line-of-sight deposition process which prevents deposition on complex geometries.Furthermore，it has been reported that some self-assembled monolayers（SAMs）are superior to DLC coatings in terms of their hydrophobicity and tribological performance（39.40，41）.

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