中国物理B ›› 2012, Vol. 21 ›› Issue (8): 83102-083102.doi: 10.1088/1674-1056/21/8/083102

• ATOMIC AND MOLECULAR PHYSICS • 上一篇    下一篇

Size-dependent surface tension of cylindrical nano-bubble in liquid Ar

闫红a b, 朱如曾a, 魏久安a c   

  1. a State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;
    b Department of Electronic Information and Physics, Changzhi University, Changzhi 046011, China;
    c Advanced Semiconductor Materials (ASM) Technology Singapore, 2 Yishun Avenue 7, Singapore 768924
  • 收稿日期:2011-12-27 修回日期:2012-02-13 出版日期:2012-07-01 发布日期:2012-07-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11072242).

Size-dependent surface tension of cylindrical nano-bubble in liquid Ar

Yan Hong (闫红)a b, Zhu Ru-Zeng (朱如曾)a, Wei Jiu-An (魏久安 )a c   

  1. a State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;
    b Department of Electronic Information and Physics, Changzhi University, Changzhi 046011, China;
    c Advanced Semiconductor Materials (ASM) Technology Singapore, 2 Yishun Avenue 7, Singapore 768924
  • Received:2011-12-27 Revised:2012-02-13 Online:2012-07-01 Published:2012-07-01
  • Contact: Zhu Ru-Zeng E-mail:zhurz@lnm.imech.ac.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11072242).

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摘要： In view of the continued disputes on the fundamental question whether the surface tension of vapour bubble in liquid argon increases, or decreases, or remains unchanged with the increase of curvature radius, the cylindrical vapour bubble of argon is studied by molecular dynamics simulation in this paper instead of spherical vapour bubble so as to reduce the statistical error. So far the surface tension of the cylindrical vapour bubble has not been studied by molecular dynamics simulation in the literature. Our results show that the surface tension decreases with radius increasing. By fitting Tolman equation with our data, the Tolman length δ =-0.6225 sigma is given under cut-off radius 2.5σ, where σ =0.3405 nm is the diameter of argon atom. The Tolman length of Ar being negative is affirmed and the Tolman length of Ar being approximately zero given in the literature is negated, and it is pointed that this error is attributed to the application of the inapplicable empirical equation of state and the neglect of the difference between surface of tension and equimolar surface.

关键词: cylindrical nano-bubble, surface tension, Tolman length, molecular dynamics simulation

Abstract: In view of the continued disputes on the fundamental question whether the surface tension of vapour bubble in liquid argon increases, or decreases, or remains unchanged with the increase of curvature radius, the cylindrical vapour bubble of argon is studied by molecular dynamics simulation in this paper instead of spherical vapour bubble so as to reduce the statistical error. So far the surface tension of the cylindrical vapour bubble has not been studied by molecular dynamics simulation in the literature. Our results show that the surface tension decreases with radius increasing. By fitting Tolman equation with our data, the Tolman length δ =-0.6225 sigma is given under cut-off radius 2.5σ, where σ =0.3405 nm is the diameter of argon atom. The Tolman length of Ar being negative is affirmed and the Tolman length of Ar being approximately zero given in the literature is negated, and it is pointed that this error is attributed to the application of the inapplicable empirical equation of state and the neglect of the difference between surface of tension and equimolar surface.

Key words: cylindrical nano-bubble, surface tension, Tolman length, molecular dynamics simulation

中图分类号:  (Molecular dynamics and other numerical methods)

  • 31.15.xv
68.03.Cd (Surface tension and related phenomena) 68.35.Md (Surface thermodynamics, surface energies)