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在封闭的zwitterionic分子中的电场摩擦效应

Melisa M Gianetti¹, Roberto Guerra², Andrea Vanossi³

¹Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria 16, Milano 20133, Italy. nicola.manini@fisica.unimi.it.

Physical chemistry chemical physics : PCCP

|July 7, 2023

概括

一个横向电场可以控制zwitterionic分子中的摩擦,在stick-slip和光滑滑动之间切换. 这种电极化可以对摩擦力进行可逆控制,从而影响热效应和外部负载反应.

科学领域:

部落学 (tribology) 是一个学科.
材料科学材料科学材料科学
表面化学表面化学

背景情况:

兹威特子分子表现出独特的摩擦性质,包括热摩擦增强.
在分子层面控制摩擦对于先进的材料设计和纳米技术至关重要.

研究的目的:

理论上研究横向电场对被包装的zwitterionic分子的摩擦反应的影响.
探索分子结构,方向和在电场应用下的摩擦之间的关系.
了解电场如何影响热摩擦增强和其他三元学量.

主要方法:

包装的双层zwitterionic分子的理论探索.
分析由外部电场引起的双极时刻重定向.
研究分子阵列,相互导向和相互锁定,以建立结构-属性关系.

主要成果:

应用的电场可以诱导分子二极体的重定向,从而导致可调节的滑动动力学 (粘滑或光滑).
平均剪切应力值显示显著的变化,取决于电场强度和分子配置.
电场应用抑制了热摩擦增强,恢复了预期的热性.
外部负荷对摩擦的影响由电场强度调节,观察到相反的效应.

结论:

滑动表面的电极化提供了一种机制,用于在zwitterionic分子系统中可逆控制摩擦力.
这些发现揭示了一种结构-属性关系,它控制着摩擦,受分子排列和电场相互作用的影响.
这项工作为通过外部电场操纵设计具有可调节的三角学性质的材料开辟了新的途径.

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