Remnants of the disappearing critical point in chain-forming patchy fluids

Daniel Stopper, Hendrik Hansen-Goos, Roland Roth*, Robert Evans

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

6 Citations (Scopus)

Abstract

For a standard model of patchy colloidal fluids with patch number M = 2, where chain formation (polymerization) occurs, we show that Wertheim theory predicts critical behavior at vanishing density and temperature. The analysis is based on determining lines in the phase diagram of maximal correlation length and compressibility. Simulation studies identify the latter line and confirm our prediction of Fisher-Widom crossover, i.e., the asymptotic decay of the pair correlation function changes from monotonic to damped oscillatory as the density is increased. For M > 2, it is known that phase separation occurs with a true critical point. Our results support the notion that a "disappearing" critical point occurs in the limit M = 2 and we uncover its remnants.

Original languageEnglish
Article number111101
JournalJournal of Chemical Physics
Volume152
Issue number11
DOIs
Publication statusPublished - 21 Mar 2020

Bibliographical note

Funding Information:
D.S. acknowledges financial support from the Carl-Zeiss-Stiftung and the hospitality of the Theoretical Physics Group at the University of Bristol during his visit. We thank John Russo and Emanuela Zaccarelli for valuable discussions.

Publisher Copyright:
© 2020 Author(s).

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