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Journal of Chemical Physics / Volume 132 / Issue 23 / ARTICLES / Surfaces, Interfaces, and Materials

J. Chem. Phys. 132, 234709 (2010); http://dx.doi.org/10.1063/1.3442436 (12 pages)

String-fluid transition in systems with aligned anisotropic interactions

P. C. Brandt, A. V. Ivlev, and G. E. Morfill

Max-Planck-Institut für extraterrestrische Physik, Garching 85741, Germany

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(Received 8 February 2010; accepted 11 May 2010; published online 21 June 2010)

Systems with aligned anisotropic interactions between particles exhibit numerous phase transitions. A remarkable example of the fluid phase transition occurring in such systems is the formation of particle strings—the so-called “string” or “chain” fluids. We employ an approach based on the Ornstein–Zernike (OZ) equation, which allows us to calculate structural properties of fluids with aligned anisotropic interactions. We show that the string-fluid transition can be associated with the bifurcation of the “isotropic” correlation length into two distinct scales which characterize the longitudinal and transverse order in string fluids and, hence, may be used as a fingerprint of this transition. The comparison of the proposed OZ theory with the Monte Carlo simulations reveals fairly good agreement.

© 2010 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. MODEL
  3. METHODS
    1. MC simulations
    2. OZ approach
  4. RESULTS
    1. Weakly anisotropic fluid
      1. OZ approach
      2. Comparison with MC simulations
    2. String fluid
      1. Phase transition
      2. Distinction between weakly anisotropic and string fluids
      3. Comparison of interaction models
  5. SUMMARY AND CONCLUSIONS

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KEYWORDS and PACS

Keywords

bifurcation, Monte Carlo methods, phase transformations, Zernike polynomials

PACS

  • 64.70.-p

    Specific phase transitions

  • 81.30.-t

    Phase diagrams and microstructures developed by solidification and solid-solid phase transformations

  • 02.10.De

    Algebraic structures and number theory

  • 02.30.Oz

    Bifurcation theory

  • 61.43.Bn

    Structural modeling: serial-addition models, computer simulation

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3442436

PUBLICATION DATA

ISSN

0021-9606 (print)  
1089-7690 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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