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Title: On the theory of phase transitions in magnetic fluids

Abstract

Particles of magnetic fluids (ferrofluids), as is known from experiments, can condense to bulk dense phases at low temperatures (that are close to room temperature) in response to an external magnetic field. It is also known that a uniform external magnetic field increases the threshold temperature of the observed condensation, thus stimulating the condensation process. Within the framework of early theories, this phenomenon is interpreted as a classical gas-liquid phase transition in a system of individual particles involved in a dipole-dipole interaction. However, subsequent investigations have revealed that, before the onset of a bulk phase transition, particles can combine to form a chain cluster or, possibly, a topologically more complex heterogeneous cluster. In an infinitely strong magnetic field, the formation of chains apparently suppresses the onset of a gas-liquid phase transition and the condensation of magnetic particles most likely proceeds according to the scenario of a gas-solid phase transition with a wide gap between spinodal branches. This paper reports on the results of investigations into the specific features of the condensation of particles in the absence of an external magnetic field. An analysis demonstrates that, despite the formation of chains, the condensation of particles in this case can proceed accordingmore » to the scenario of a gas-liquid phase transition with a critical point in the continuous binodal. Consequently, a uniform magnetic field not only can stimulate the condensation phase transition in a system of magnetic particles but also can be responsible for a qualitative change in the scenario of the phase transition. This inference raises the problem regarding a threshold magnetic field in which there occurs a change in the scenario of the phase transition.« less

Authors:
;  [1]
  1. Ural State University, Department of Mathematical Physics (Russian Federation)
Publication Date:
OSTI Identifier:
21075660
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Experimental and Theoretical Physics; Journal Volume: 105; Journal Issue: 5; Other Information: DOI: 10.1134/S1063776107110143; Copyright (c) 2007 Nauka/Interperiodica; Article Copyright (c) 2007 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DIPOLES; LIQUIDS; MAGNETIC FIELDS; MAGNETIC MATERIALS; PARTICLES; PHASE TRANSFORMATIONS; TEMPERATURE RANGE 0065-0273 K; TEMPERATURE RANGE 0273-0400 K

Citation Formats

Zubarev, A. Yu., E-mail: Andrey.Zubarev@usu.ru, and Iskakova, L. Yu. On the theory of phase transitions in magnetic fluids. United States: N. p., 2007. Web. doi:10.1134/S1063776107110143.
Zubarev, A. Yu., E-mail: Andrey.Zubarev@usu.ru, & Iskakova, L. Yu. On the theory of phase transitions in magnetic fluids. United States. doi:10.1134/S1063776107110143.
Zubarev, A. Yu., E-mail: Andrey.Zubarev@usu.ru, and Iskakova, L. Yu. 2007. "On the theory of phase transitions in magnetic fluids". United States. doi:10.1134/S1063776107110143.
@article{osti_21075660,
title = {On the theory of phase transitions in magnetic fluids},
author = {Zubarev, A. Yu., E-mail: Andrey.Zubarev@usu.ru and Iskakova, L. Yu.},
abstractNote = {Particles of magnetic fluids (ferrofluids), as is known from experiments, can condense to bulk dense phases at low temperatures (that are close to room temperature) in response to an external magnetic field. It is also known that a uniform external magnetic field increases the threshold temperature of the observed condensation, thus stimulating the condensation process. Within the framework of early theories, this phenomenon is interpreted as a classical gas-liquid phase transition in a system of individual particles involved in a dipole-dipole interaction. However, subsequent investigations have revealed that, before the onset of a bulk phase transition, particles can combine to form a chain cluster or, possibly, a topologically more complex heterogeneous cluster. In an infinitely strong magnetic field, the formation of chains apparently suppresses the onset of a gas-liquid phase transition and the condensation of magnetic particles most likely proceeds according to the scenario of a gas-solid phase transition with a wide gap between spinodal branches. This paper reports on the results of investigations into the specific features of the condensation of particles in the absence of an external magnetic field. An analysis demonstrates that, despite the formation of chains, the condensation of particles in this case can proceed according to the scenario of a gas-liquid phase transition with a critical point in the continuous binodal. Consequently, a uniform magnetic field not only can stimulate the condensation phase transition in a system of magnetic particles but also can be responsible for a qualitative change in the scenario of the phase transition. This inference raises the problem regarding a threshold magnetic field in which there occurs a change in the scenario of the phase transition.},
doi = {10.1134/S1063776107110143},
journal = {Journal of Experimental and Theoretical Physics},
number = 5,
volume = 105,
place = {United States},
year = 2007,
month =
}