Self-Formed Double Tribolayers Play Collaborative Roles in Achieving Superlow Friction in an Aqueous Environment

Yusuke Ootani, Jingxiang Xu, Naoki Takahashi, Kenta Akagami, Satoshi Sakaki, Yang Wang, Nobuki Ozawa, Takahiro Hatano, Koshi Adachi, Momoji Kubo

研究成果: Article査読

3 被引用数 (Scopus)

抄録

A mechanism to achieve superlow friction in water lubrication is still in the debate because friction is accompanied by complex mechanochemical processes at sliding interfaces. Here, we experimentally demonstrate that superlow friction of silicon-based ceramics in water is achievable because of a self-formed double tribolayer. The outermost tribolayer can be removed from the surface, but the second tribolayer is strongly bound to the surface. Molecular dynamics simulations revealed that the outermost tribolayer was colloidal silica and the second tribolayer was a hydrophilic hydrate. The outermost colloidal silica layer acted as a lubricant and reduced friction. Retention of the water and colloidal silica layer at the sliding interface due to the hydrophilicity of the hydrate layer led to high load-carrying capacity. The reduction of friction by the first tribolayer and the increased load-carrying capacity associated with the second tribolayer played collaborative roles that made superlow friction achievable in water.

本文言語English
ページ(範囲)8295-8303
ページ数9
ジャーナルJournal of Physical Chemistry C
124
15
DOI
出版ステータスPublished - 2020 4 16

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • エネルギー(全般)
  • 物理化学および理論化学
  • 表面、皮膜および薄膜

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