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Theory of two-dimensional self-assembly of Janus colloids: crystallization and orientational ordering

Journal Article · · Soft Matter
DOI:https://doi.org/10.1039/c3sm52094c· OSTI ID:1876440
 [1];  [2]
  1. Univ. of Illinois, Urbana, IL (United States); University of Illinois
  2. Univ. of Illinois, Urbana, IL (United States)
We study the rich crystalline phase behavior of amphiphilic spherical Janus colloids using a new formulation of self-consistent phonon theory that includes coupled translational and rotational entropic and enthalpic contributions to the free energy. In contrast to homogeneous spheres, broken rotational symmetry can result in more exotic crystals that possess distinct orientational patterns, and also plastic crystals. Ground states are identified based on the compatibility between the patch geometry of particles (e.g., patch coverage, number, shape) and lattice symmetry. We derive the explicit coupled self-consistent equations for translational and rotational localization parameters for effectively 2-dimensional dense monolayers of Janus crystals. The equations are numerically solved for a given crystal symmetry, thermodynamic state, and patch orientational order, and the thermodynamic stability of different phases is determined. For hexagonal packing, we predict with increasing temperature or decreasing attraction strength the possibility of a phase sequence of maximally bonded zigzag stripe, trimer, and rotationally disordered plastic crystal phases (or a phase sequence of trimer, dimer, and plastic crystal), which depends sensitively on particle chemical composition (Janus balance) and pressure. Here, the role of rotational entropy in stabilizing the intermediate trimer (or dimer) phase at intermediate temperatures and high pressures is discussed in detail. Evolution of the center-of-mass vibrational and rotational amplitudes with thermodynamic state and Janus balance is also determined.
Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
DOE Contract Number:
FG02-07ER46471
OSTI ID:
1876440
Journal Information:
Soft Matter, Journal Name: Soft Matter Journal Issue: 2 Vol. 10; ISSN 1744-683X
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English

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Cited By (11)

Critical Casimir interactions between Janus particles journal January 2016
Assembly and phase transitions of colloidal crystals journal January 2016
Orientational ordering of closely packed Janus particles journal January 2018
Assembly of trivalent particles under confinement: from an exotic solid phase to a liquid phase at low temperature journal January 2017
Selective Janus Particle Assembly at Tipping Points of Thermally-Switched Wetting journal March 2014
Synthetische kovalente und nichtkovalente zweidimensionale Materialien journal October 2015
Self-assembly in two-dimensional mixtures of Janus disks and isotropic particles journal January 2019
Synthetic Covalent and Non-Covalent 2D Materials journal October 2015
Self-assembly of Janus disks confined in a slit journal September 2019
Design colloidal particle morphology and self-assembly for coating applications journal January 2017
Equilibrium cluster fluids: pair interactions via inverse design journal January 2015

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