Depletion-driven four-phase coexistences in discotic systems

Álvaro González García, Remco Tuinier, Jasper V. Maring, Joeri Opdam, Henricus H. Wensink, Henk N.W. Lekkerkerker

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Abstract

Free volume theory (FVT) is a versatile and tractable framework to predict the phase behaviour of mixtures of platelets and non-adsorbing polymer chains in a common solvent. Within FVT, three principal reference phases for the hard platelets are considered: isotropic (I), nematic (N) and columnar (C). We derive analytical expressions that enable us to systematically trace the different types of phase coexistences revealed upon adding depletants and confirm the predictive power of FVT by testing the calculated diagrams against phase stability scenarios from computer simulation. A wide range of multi-phase equilibria is revealed, involving two-phase isostructural transitions of all phase symmetries (INC) considered as well as the possible three-phase coexistences. Moreover, we identify the system parameters, relative disk shapes and colloid–polymer size ratios, at which four-phase equilibria are expected. These involve a remarkable coexistence of all three-phase states commonly encountered in discotics including isostructural coexistences I1–I2–N–C, I–N1–N2–C and I–N–C1–C2.

Original languageEnglish
Pages (from-to)2757-2772
Number of pages16
JournalMolecular Physics
Volume116
Issue number21-22
DOIs
Publication statusPublished - 3 May 2018

Fingerprint

Free volume
depletion
Blood Platelets
Platelets
platelets
Phase equilibria
Phase Transition
disks (shapes)
Computer Simulation
Polymers
Phase stability
Phase behavior
computerized simulation
Phase transitions
diagrams
Computer simulation
polymers
Testing
symmetry

Keywords

  • colloid–polymer mixtures
  • depletion
  • Discotic
  • multi-phase equilibria
  • phase behaviour

Cite this

García, Álvaro González ; Tuinier, Remco ; Maring, Jasper V. ; Opdam, Joeri ; Wensink, Henricus H. ; Lekkerkerker, Henk N.W. / Depletion-driven four-phase coexistences in discotic systems. In: Molecular Physics. 2018 ; Vol. 116, No. 21-22. pp. 2757-2772.
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Depletion-driven four-phase coexistences in discotic systems. / García, Álvaro González; Tuinier, Remco; Maring, Jasper V.; Opdam, Joeri; Wensink, Henricus H.; Lekkerkerker, Henk N.W.

In: Molecular Physics, Vol. 116, No. 21-22, 03.05.2018, p. 2757-2772.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Maring, Jasper V.

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