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Directional-dependent pockets drive columnar-columnar coexistence.

Álvaro González García1, Remco Tuinier2, Gijsbertus de With2

  • 1Laboratory of Physical Chemistry, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, The Netherlands. a.gonzalez.garcia@tue.nl and Van't Hoff Laboratory for Physical and Colloid Chemistry, Department of Chemistry & Debye Institute, Utrecht University, The Netherlands. r.tuinier@tue.nl.

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This summary is machine-generated.

Adding tiny spheres (depletants) to disc-like particles (discotics) creates two dense liquid-crystalline columnar phases. This phase coexistence arises from directional free-volume pockets for depletants.

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Area of Science:

  • Materials Science
  • Soft Matter Physics
  • Physical Chemistry

Background:

  • Rational material design relies on understanding self-assembly mechanisms.
  • Dense and shape-asymmetric systems present unique self-assembly challenges.
  • The behavior of depletants in confined geometries is not fully understood.

Purpose of the Study:

  • To investigate the effect of adding non-adsorbing spheres (depletants) to a dense system of discotic particles.
  • To explore the emergence of novel phase behaviors in binary mixtures.
  • To understand the role of directional free-volume in driving phase coexistence.

Main Methods:

  • Theoretical modeling of depletant-discotics interactions.
  • Molecular dynamics simulations of the binary mixture.
  • Analysis of phase diagrams and free-volume distributions.

Main Results:

  • Observed coexistence between two distinct, highly dense liquid-crystalline columnar phases.
  • Identified directional-dependent free-volume pockets for depletants as the driving mechanism.
  • Defined the stability limits of columnar-columnar coexistence.
  • Quantified the directional-dependent partitioning of depletants.

Conclusions:

  • The addition of depletants can induce complex phase behavior in dense discotic systems.
  • Directional free-volume is a critical factor in controlling self-assembly and phase formation.
  • This work provides a framework for designing materials with tunable liquid-crystalline properties.