中国物理B ›› 2015, Vol. 24 ›› Issue (10): 104702-104702.doi: 10.1088/1674-1056/24/10/104702

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Ferrofluid nucleus phase transitions in an external uniform magnetic field

B. M. Tanygin, S. I. Shulyma, V. F. Kovalenko, M. V. Petrychuk   

  1. Faculty of Radiophysics, Taras Shevchenko National University of Kyiv, 4G, Acad. Glushkov Ave., Kyiv 03187, Ukraine
  • 收稿日期:2015-03-13 修回日期:2015-05-05 出版日期:2015-10-05 发布日期:2015-10-05

Ferrofluid nucleus phase transitions in an external uniform magnetic field

B. M. Tanygin, S. I. Shulyma, V. F. Kovalenko, M. V. Petrychuk   

  1. Faculty of Radiophysics, Taras Shevchenko National University of Kyiv, 4G, Acad. Glushkov Ave., Kyiv 03187, Ukraine
  • Received:2015-03-13 Revised:2015-05-05 Online:2015-10-05 Published:2015-10-05
  • Contact: B. M. Tanygin E-mail:b.m.tanygin@gmail.com

摘要: The phase transition between a massive dense phase and a diluted superparamagnetic phase has been studied by means of a direct molecular dynamics simulation. The equilibrium structures of the ferrofluid aggregate nucleus are obtained for different values of a temperature and an external magnetic field magnitude. An approximate match of experiment and simulation has been shown for the ferrofluid phase diagram coordinates “field-temperature”. The provided phase coexistence curve has an opposite trend comparing to some of known theoretical results. This contradiction has been discussed. For given experimental parameters, it has been concluded that the present results describe more precisely the transition from linear chains to a dense globes phase. The theoretical concepts which provide the opposite binodal curve dependency trend match other experimental conditions: a diluted ferrofluid, a high particle coating rate, a high temperature, and/or a less particles coupling constant value.

关键词: ferrofluid, aggregate, phase diagram, molecular dynamics

Abstract: The phase transition between a massive dense phase and a diluted superparamagnetic phase has been studied by means of a direct molecular dynamics simulation. The equilibrium structures of the ferrofluid aggregate nucleus are obtained for different values of a temperature and an external magnetic field magnitude. An approximate match of experiment and simulation has been shown for the ferrofluid phase diagram coordinates “field-temperature”. The provided phase coexistence curve has an opposite trend comparing to some of known theoretical results. This contradiction has been discussed. For given experimental parameters, it has been concluded that the present results describe more precisely the transition from linear chains to a dense globes phase. The theoretical concepts which provide the opposite binodal curve dependency trend match other experimental conditions: a diluted ferrofluid, a high particle coating rate, a high temperature, and/or a less particles coupling constant value.

Key words: ferrofluid, aggregate, phase diagram, molecular dynamics

中图分类号:  (Magnetic fluids and ferrofluids)

  • 47.65.Cb
02.70.Ns (Molecular dynamics and particle methods)