Supracolloidal Reaction Kinetics of Janus Spheres

  title={Supracolloidal Reaction Kinetics of Janus Spheres},
  author={Qian Chen and Jonathan K. Whitmer and Shan Jiang and Sung Chul Bae and Erik Luijten and Steve Granick},
  pages={199 - 202}
Colloidal particles that are charged on one side and hydrophobic on the other can form chiral helices in salt solutions. Clusters in the form of aggregates of a small number of elemental units display structural, thermodynamic, and dynamic properties different from those of bulk materials. We studied the kinetic pathways of self-assembly of “Janus spheres” with hemispherical hydrophobic attraction and found key differences from those characteristic of molecular amphiphiles. Experimental… 

Self-Assembly Mechanisms of Triblock Janus Particles.

In agreement with experiment, it is found that nucleation of the Kagome lattice from solution follows a two-step mechanism, and the scaling behavior of the calculated barrier heights confirms a first-order liquid-Kagome phase transition.

Phase diagram of two-patch colloids with competing anisotropic and isotropic interactions

  • I. MalhotraS. Babu
  • Materials Science
    Journal of physics. Condensed matter : an Institute of Physics journal
  • 2020
The simulation results show that the method can characterize phase behavior of glucose isomerase protein, which provides a novel tool to unveil self-assembly mechanism of protein under different conditions.

Asymmetric assembly of Lennard-Jones Janus dimers.

The orientations of two amphiphilic Janus spheres within a dimer in an explicit fluid are studied with high geometric resolution and relatively large polar angles become more favored as the hydrophobic surface area is increased.

Stable cluster phase of Janus particles in two dimensions

A Janus colloidal particle with an attractive hemisphere has three valences, i.e. it can establish three bonds on the hemisphere in two dimensions. With experiments and simulations, we study how the

Dynamic interfacial trapping of Janus nanorod aggregates.

Taking advantage of both shape and chemical anisotropy on the same nanoparticle offers rich self-assembly possibilities for nanotechnology. Through Dissipative Particle Dynamics (DPD) calculations,

Hierarchical self-assembly of chiral fibres from achiral particles

This demonstration of aggregate-wide chirality emerging owing to packing alone is pertinent to many biological and synthetic hierarchically self-assembling systems.

Ordering of amphiphilic Janus particles at planar walls: a density functional study.

It is shown that the anisotropic Janus interaction yields pronounced frustration effects at low temperatures.

Phase behavior of Janus colloids determined by sedimentation equilibrium.

The lamellar phase is shown to have a different range of stability than previously observed in simulation studies for systems of similar and longer-ranged interactions.

The impact of anisotropy and interaction range on the self-assembly of Janus ellipsoids.

Monte Carlo simulation is employed to investigate the propensity for the formation of aggregates in a spheroidal model of a colloid having a relatively short-ranged interaction that is consistent with experimentally realizable systems.

Role of Shape in the Self-Assembly of Anisotropic Colloids.

Self-assembly is the process of spontaneous organization of a set of interacting components colloidal particles in suspension interacting with one another can organize into crystals, gels, glasses



Hierarchical self-assembly of asymmetric amphiphatic spherical colloidal particles.

A narrow region where particles self-assemble into hollow faceted cages that could potentially find interesting engineering applications is uncovered.

Clusters of amphiphilic colloidal spheres.

This study shows that amphiphilic colloidal spheres, hydrophobic on one hemisphere and charged on the other, assemble in water into extended structures not formed by spheres of uniform surface chemical makeup.

Phase diagram of Janus particles.

A simple model representative of the recently synthesized Janus particles, i.e., colloidal spherical particles whose surface is divided into two areas of different chemical composition, is investigated, providing the first model in which micellization and phase separation are simultaneously observed.

Dynamical arrest in attractive colloids: the effect of long-range repulsion.

These findings imply that dynamical arrest occurs via cluster growth and association in suspensions of model colloidal particles with short-ranged attractive and long-ranged repulsive interactions by means of three-dimensional fluorescence confocal microscopy.

One-dimensional cluster growth and branching gels in colloidal systems with short-range depletion attraction and screened electrostatic repulsion.

Extensive numerical simulations of a simple model for charged colloidal particles in suspension with small nonadsorbing polymers show that particles locally cluster into quasi one-dimensional aggregates which, via a branching mechanism, form a macroscopic percolating gel structure under low temperature conditions.

Anomalously large equilibrium clusters of colloids

We propose a mechanism for mesophase separation in a system of aggregating colloids. Conditions are outlined under which colloids can form equilibrium clusters with very large sizes, i.e.,

Molecular Mimetic Self‐Assembly of Colloidal Particles

This article presents an overview of the current progress in molecular mimetic self‐assembly of colloidal particles. Firstly, the recent study of colloidal particles at interfaces is highlighted,

Self-assembly of amphiphilic peanut-shaped nanoparticles.

We use computer simulation to investigate the self-assembly of Janus-like amphiphilic peanut-shaped nanoparticles, finding phases of clusters, bilayers, and micelles in accord with ideas of packing

On the Origins of Morphological Complexity in Block Copolymer Surfactants

Experiments with poly(1,2-butadiene-b-ethylene oxide) diblock copolymers are described, which form Y-junctions and three-dimensional networks in water at weight fractions of PEO intermediate to those associated with vesicle and wormlike micelle morphologies.

On the Theory of Micellization Kinetics

It is demonstrated that micelle formation at the conventional (equilibrium) critical micelle concentration (CMC, c c) can be inhibited by high activation energy barriers and significant hysteresis effects are inherent in amphiphilic systems sincemicelle formation and dissociation are activation processes.