An investigation of critical and noncritical correlations in model colloidal fluids

D. Pini*, A. Parola, L. Reatto, F. Lo Verso, M. Tau

*Kontaktforfatter for dette arbejde

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Resumé

We present a study of the correlation length ξ of a hard-core fluid with three different tail interactions, namely, the Asakura-Oosawa potential, an attractive Yukawa tail, and a double Yukawa tail which is attractive at short distance and repulsive at long distance. The correlation length is obtained along the critical isochore in the whole range of supercritical temperatures by determining the leading pole of the structure factor S(k) in the complex plane, where S(k) is obtained from the hierarchical reference theory. We focus on how ξ changes from its Ornstein-Zernike form in the critical region to its high-temperature limit, and find instances of both the Fisher-Widom and Kirkwood scenarios for the monotonic to oscillatory crossover of the decay of correlations at long distance.

OriginalsprogEngelsk
Artikelnummer494246
TidsskriftJournal of Physics Condensed Matter
Vol/bind20
Udgave nummer49
ISSN0953-8984
DOI
StatusUdgivet - 10. dec. 2008
Udgivet eksterntJa

Fingeraftryk

Isochores
Fluids
fluids
Poles
Temperature
crossovers
poles
decay
interactions
temperature

Citer dette

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An investigation of critical and noncritical correlations in model colloidal fluids. / Pini, D.; Parola, A.; Reatto, L.; Lo Verso, F.; Tau, M.

I: Journal of Physics Condensed Matter, Bind 20, Nr. 49, 494246, 10.12.2008.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - An investigation of critical and noncritical correlations in model colloidal fluids

AU - Pini, D.

AU - Parola, A.

AU - Reatto, L.

AU - Lo Verso, F.

AU - Tau, M.

PY - 2008/12/10

Y1 - 2008/12/10

N2 - We present a study of the correlation length ξ of a hard-core fluid with three different tail interactions, namely, the Asakura-Oosawa potential, an attractive Yukawa tail, and a double Yukawa tail which is attractive at short distance and repulsive at long distance. The correlation length is obtained along the critical isochore in the whole range of supercritical temperatures by determining the leading pole of the structure factor S(k) in the complex plane, where S(k) is obtained from the hierarchical reference theory. We focus on how ξ changes from its Ornstein-Zernike form in the critical region to its high-temperature limit, and find instances of both the Fisher-Widom and Kirkwood scenarios for the monotonic to oscillatory crossover of the decay of correlations at long distance.

AB - We present a study of the correlation length ξ of a hard-core fluid with three different tail interactions, namely, the Asakura-Oosawa potential, an attractive Yukawa tail, and a double Yukawa tail which is attractive at short distance and repulsive at long distance. The correlation length is obtained along the critical isochore in the whole range of supercritical temperatures by determining the leading pole of the structure factor S(k) in the complex plane, where S(k) is obtained from the hierarchical reference theory. We focus on how ξ changes from its Ornstein-Zernike form in the critical region to its high-temperature limit, and find instances of both the Fisher-Widom and Kirkwood scenarios for the monotonic to oscillatory crossover of the decay of correlations at long distance.

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