Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Theoretical Study of the Structure and Assembly of Janus Rods

Journal Article · · Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry
DOI:https://doi.org/10.1021/jp308991c· OSTI ID:1876434
 [1];  [2]
  1. Univ. of Illinois, Urbana, IL (United States); University of Illinois
  2. Univ. of Illinois, Urbana, IL (United States)

Microscopic integral equation theory is applied to investigate the real and Fourier space structure and phase behavior of compositionally symmetric AB Janus rods that interact via hard core excluded volume interactions and competing repulsive and attractive tail potentials. If the spatial range of the latter are short and equal, chemical asymmetry results in attraction-driven assembly into a cylindrical micellar structure of spatial periodicity between one and two rods lengths. The apparent microphase spinodal ordering temperature increases with attraction range and rod length, and the microdomain coherence length strongly grows upon cooling. However, as the tail repulsion range increases significantly, the micellar morphology is destroyed and a new repulsion-driven ordering emerges at high volume fractions characterized by a much smaller spatial periodicity. We also find a tight correlation between the local attraction-induced clustering (quantified by the excess number of nearest neighbors) and the microdomain-scale ordering (measured by the amplitude of the intense low wavevector peak of the collective structure factor). Moreover, the former converges to a unique value at the microphase spinodal temperature for all volume fractions, repulsion strengths, and tail repulsion ranges studied, in qualitative contrast to the behavior of the repulsive-interaction driven ordering phenomena. Furthermore, the phase behavior trends of the integral equation approach are compared to a computationally and conceptually simpler mean field hybrid formulation based on a random phase approximation treatment of tail potentials, thereby allowing the role of physical clustering, interparticle correlations, and microdomain scale concentration fluctuations to be assessed.

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
Grant/Contract Number:
FG02-07ER46471
OSTI ID:
1876434
Journal Information:
Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry, Journal Name: Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry Journal Issue: 1 Vol. 117; ISSN 1520-6106
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (60)

Synthesis of Monodisperse Bicolored Janus Particles with Electrical Anisotropy Using a Microfluidic Co-Flow System journal May 2006
Janus Particle Synthesis and Assembly journal January 2010
Polymer-induced phase separations in nonaqueous colloidal suspensions journal November 1983
Dynamical fluctuation effects in glassy colloidal suspensions journal December 2007
Assembled Surface-Anisotropic Colloids as a Template for a Multistage Catalytic Membrane Reactor journal July 2009
Catalytic Nanomotors:  Autonomous Movement of Striped Nanorods journal October 2004
Staged Self-Assembly of Colloidal Metastructures journal June 2012
Janus Colloidal Matchsticks journal July 2012
Modulated Phases: Review and Recent Results journal December 2008
Rapid Fabrication of Bimetallic Spherical Motors journal August 2010
Patchy Particles by Glancing Angle Deposition journal January 2008
Clusters of Amphiphilic Colloidal Spheres journal February 2008
Controlling the Geometry (Janus Balance) of Amphiphilic Colloidal Particles journal March 2008
Glassy Dynamics and Kinetic Vitrification of Isotropic Suspensions of Hard Rods journal July 2008
Single-Particle Tracking of Janus Colloids in Close Proximity journal July 2008
Solvent-Free Synthesis of Janus Colloidal Particles journal September 2008
Thermoreversible morphology transition between spherical and cylindrical microdomains of block copolymers journal October 1993
Equilibrium morphology of block copolymer melts journal October 1986
The Full Phase Behavior for Block Copolymers in Solvents of Varying Selectivity journal June 2002
Theory of Microphase Separation in Block Copolymers journal November 1980
Morphology, Dynamic Mechanical Properties, and Phase Behavior of ABC-Triblock Copolymers with Two Semicompatible Elastomer Blocks journal March 1998
Patterned Fluorescent Particles as Nanoprobes for the Investigation of Molecular Interactions journal July 2003
Absorption Properties of Metal–Semiconductor Hybrid Nanoparticles journal May 2011
Controlled Fabrication of Fluorescent Barcode Nanorods journal July 2010
Self-Assembly of Janus Nanoparticles in Diblock Copolymers journal January 2010
Directed self-assembly of a colloidal kagome lattice journal January 2011
Biphasic Janus particles with nanoscale anisotropy journal September 2005
Two dimensional assembly of triblock Janus particles into crystal phases in the two bond per patch limit journal January 2011
One-pot facile synthesis of Janus particles with tailored shape and functionality journal January 2011
Theory of X-ray scattering by liquid macromolecules with heavy atom labels journal January 1970
Fluid–fluid coexistence in colloidal systems with short-ranged strongly directional attraction journal June 2003
Brownian modulated optical nanoprobes journal January 2004
Optimized Cluster Expansions for Classical Fluids. II. Theory of Molecular Liquids journal September 1972
Ordering of amphiphilic Janus particles at planar walls: A density functional study journal April 2011
Simulation and theory of a model for tetrahedral colloidal particles journal May 2011
Theory of nonlinear elasticity, stress-induced relaxation, and dynamic yielding in dense fluids of hard nonspherical colloids journal April 2012
Fluctuation effects in the theory of microphase separation in block copolymers journal July 1987
Self-assembly of model amphiphilic Janus particles journal May 2012
Fluctuations effects in diblock copolymer fluids: Comparison of theories and experiment journal May 1997
Microphase separation versus the vapor-liquid transition in systems of spherical particles journal March 1999
Block Copolymers—Designer Soft Materials journal February 1999
Molecular mechanism of membrane constriction and tubulation mediated by the F-BAR protein Pacsin/Syndapin journal June 2009
Liquid state theory of the structure and phase behaviour of polymer-tethered nanoparticles in dense suspensions, melts and nanocomposites journal August 2009
Highly controllable near-surface swimming of magnetic Janus nanorods: application to payload capture and manipulation journal March 2011
Designing phoretic micro- and nano-swimmers journal May 2007
Analysis of Classical Statistical Mechanics by Means of Collective Coordinates journal April 1958
Phase behavior of a model colloid-polymer mixture journal February 1995
Spontaneous patterning of quantum dots at the air-water interface journal June 1999
Random packings of spheres and spherocylinders simulated by mechanical contraction journal May 2003
Activated dynamics in dense fluids of attractive nonspherical particles. I. Kinetic crossover, dynamic free energies, and the physical nature of glasses and gels journal April 2011
Activated dynamics in dense fluids of attractive nonspherical particles. II. Elasticity, barriers, relaxation, fragility, and self-diffusion journal April 2011
Phase Diagram of Janus Particles journal November 2009
Stable and unstable phases of a diblock copolymer melt journal April 1994
Polymeric Bicontinuous Microemulsions journal August 1997
Self-Motile Colloidal Particles: From Directed Propulsion to Random Walk journal July 2007
Soft matter journal July 1992
On-Wire Lithography journal July 2005
A cluster theory for a Janus fluid journal March 2012
The influence of chain stretching on the phase behavior of multiblock copolymer and comb copolymer melts journal April 2003
Attachment of Rod-Like (BAR) Proteins and Membrane Shape journal April 2011

Cited By (3)

Evidence of Structural Inhomogeneities in Hard-Soft Dimeric Particles without Attractive Interactions journal December 2019
Janus Membranes: Exploring Duality for Advanced Separation journal June 2016
Structure and phase behavior of colloidal dumbbells with tunable attractive interactions journal January 2013

Similar Records

Interactions regulating the head-to-tail directed assembly of biological Janus rods
Journal Article · Fri Mar 31 00:00:00 EDT 2017 · ChemComm · OSTI ID:1356856

Theory of kinetic arrest, elasticity, and yielding in dense binary mixtures of rods and spheres
Journal Article · Thu Dec 13 23:00:00 EST 2012 · Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics · OSTI ID:1876438

Orientationally Glassy Crystals of Janus Spheres
Journal Article · Tue May 27 00:00:00 EDT 2014 · Physical Review Letters · OSTI ID:1875847