中国物理B ›› 2015, Vol. 24 ›› Issue (9): 96801-096801.doi: 10.1088/1674-1056/24/9/096801

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Gas adsorption and accumulation on hydrophobic surfaces: Molecular dynamics simulations

骆庆群, 杨洁明   

  1. Taiyuan University of Technology, Key Laboratory Advanced Transducers and Intelligent Control System of Ministry of Education, Taiyuan 030024, China
  • 收稿日期:2014-12-26 修回日期:2015-05-19 出版日期:2015-09-05 发布日期:2015-09-05
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 21376161).

Gas adsorption and accumulation on hydrophobic surfaces: Molecular dynamics simulations

Luo Qing-Qun (骆庆群), Yang Jie-Ming (杨洁明)   

  1. Taiyuan University of Technology, Key Laboratory Advanced Transducers and Intelligent Control System of Ministry of Education, Taiyuan 030024, China
  • Received:2014-12-26 Revised:2015-05-19 Online:2015-09-05 Published:2015-09-05
  • Contact: Yang Jie-Ming E-mail:yangjieming@tyut.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 21376161).

摘要: Molecular dynamics simulations show that the gas dissolved in water can be adsorbed at a hydrophobic interface and accumulates thereon. Initially, a water depletion layer appears on the hydrophobic interface. Gas molecules then enter the depletion layer and form a high-density gas-enriched layer. Finally, the gas-enriched layer accumulates to form a nanobubble. The radian of the nanobubble increases with time until equilibrium is reached. The equilibrium state arises through a Brenner-Lohse dynamic equilibrium mechanism, whereby the diffusive outflux is compensated by an influx near the contact line. Additionally, supersaturated gas also accumulates unsteadily in bulk water, since it can diffuse back into the water and is gradually adsorbed by a solid substrate.

关键词: hydrophobic, molecular dynamics, nanobubble

Abstract: Molecular dynamics simulations show that the gas dissolved in water can be adsorbed at a hydrophobic interface and accumulates thereon. Initially, a water depletion layer appears on the hydrophobic interface. Gas molecules then enter the depletion layer and form a high-density gas-enriched layer. Finally, the gas-enriched layer accumulates to form a nanobubble. The radian of the nanobubble increases with time until equilibrium is reached. The equilibrium state arises through a Brenner-Lohse dynamic equilibrium mechanism, whereby the diffusive outflux is compensated by an influx near the contact line. Additionally, supersaturated gas also accumulates unsteadily in bulk water, since it can diffuse back into the water and is gradually adsorbed by a solid substrate.

Key words: hydrophobic, molecular dynamics, nanobubble

中图分类号:  (Gas-liquid and vacuum-liquid interfaces)

  • 68.03.-g
61.20.Ja (Computer simulation of liquid structure)