Inverse Solidification Induced by Active Janus Particles

  title={Inverse Solidification Induced by Active Janus Particles},
  author={Tao Huang and Vyacheslav R. Misko and Sophie M.-C. Gobeil and Xu Wang and Franco Nori and Julian Sch{\"u}tt and J{\"u}rgen Fassbender and Gianaurelio Cuniberti and Denys Makarov and Larysa Baraban},
  journal={Advanced Functional Materials},
Crystals melt when thermal excitations or the concentration of defects in the lattice is sufficiently high. Upon melting, the crystalline long‐range order vanishes, turning the solid to a fluid. In contrast to this classical scenario of solid melting, here a counter‐intuitive behavior of the occurrence of crystalline long‐range order in an initially disordered matrix is demonstrated. This unusual solidification is demonstrated in a system of passive colloidal particles accommodating chemically… 
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Phase Diagram of Active Brownian Spheres: Crystallization and the Metastability of Motility-Induced Phase Separation.
It is shown that states of MIPS coexistence are in fact only metastable for three-dimensional active Brownian particles over a very broad range of conditions, decaying at long times through an ordering transition the authors call active crystallization.
Interaction of Active Janus Colloids with Tracers.
Understanding the motion of artificial active swimmers in complex surroundings, such as a dense bath of passive particulate matter, is essential for their successful utilization as cargo (drug)
Phase-change Janus particles with switchable dual properties
We developed switchable Janus particles (JPs) fabricated by coating one hemisphere of silica microspheres with a phase-change film. We used the chalcogenide GeSbTe (GST), which exhibits a reversible
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This study uses molecular dynamics simulations to predict an external field-induced flow that arises in mixtures of magneto-active nanosized cubic and spherical particles with distinct mutual orientations between magnetization and propulsion, and explains why the flux of suspended particles in the field direction does not only depend on the angle between the active force and the orientation of its magnetization, but also on particle shape and inter-particle interactions.
Impact of surface charge on the motion of light-activated Janus micromotors
This work introduces an efficient way to influence Janus micromotors’ direction of motion and speed by modifying their surface properties and those of their immediate surroundings, and constitutes the first quantitative demonstration of the substrate’s surface charge on the motility of the light-activated diffusiophoretic motors in water.
Colloidal assembly manipulated by light-responsive Ag3PO4 nanoparticles.
We report controllable assembly of polystyrene (PS) microspheres via a photocatalytically driven electroosmotic flow deriving from UV irradiation of Ag3PO4 nanoparticles in water. A series of
Micro‐Bio‐Chemo‐Mechanical‐Systems: Micromotors, Microfluidics, and Nanozymes for Biomedical Applications
An interdisciplinary approach of three independent emerging topics: micromotors, nanozymes, and microfluidics to creatively solve problems whose solutions are beyond the scope of a single discipline toward the development of micro‐bio‐chemo‐mechanical‐systems for diverse bioapplications is discussed.
Escape kinetics of self-propelled particles from a circular cavity
Tanwi Debnath, Pinaki Chaudhury, Taritra Mukherjee, Debasish Mondal and Pulak K.Ghosh2∗ 1 Department of Chemistry, University of Calcutta, Kolkata 700009, India 2 Department of Chemistry, Presidency


Defect-induced melting and solid-state amorphization
DESPITE the strong interest in melting over the past 100 years, a general theory for the crystal–liquid transition has not been established1. Lattice-instability models, which are either
Non‐Equilibrium Assembly of Light‐Activated Colloidal Mixtures
The crystallization of passive silica colloids into well-controlled 2D assemblies is shown, which is directed by a small number of self-propelled active colloids, which offers the possibility of obtaining structures and assemblies that cannot be found in equilibrium systems.
Activity-controlled annealing of colloidal monolayers
A massive acceleration of the annealing of a monolayer of passive beads by moderate addition of self-propelled microparticles is shown, uncovering the potential of internal activity to control materials and lay the groundwork for the rise of materials science beyond equilibrium.
Chemical Nanomotors at the Gram Scale Form a Dense Active Optorheological Medium
It is shown that light-triggered asymmetric titanium dioxide that self-propel, can be obtained in large quantities, and self-organize to make a gram-scale active medium, which shows an activity-dependent tenfold reversible change in its bulk viscosity.
Assembly of ordered colloidal aggregrates by electric-field-induced fluid flow
Evidence suggests that the long-ranged attraction between particles which causes aggregation is mediated by electric-field-induced fluid flow, and an axially symmetric flow field is imaged around individual particles on a uniform electrode surface.
Ionic colloidal crystals of oppositely charged particles
The electrostatic interaction between oppositely charged particles can be tuned such that large ionic colloidal crystals form readily, with the approach to controlling opposite-charge interactions facilitating the production of binary crystals of micrometre-sized particles, which could find use as advanced materials for photonic applications.
Pressure-driven phase transitions and reduction of dimensionality in 2D silicon nanosheets
A reduction of dimensionality under pressure from a 2D morphology to a 1D wire in a material with a diamond structure is discovered and MD simulations indicate the reduction of thermal conductivity in such nanowires.
Active Atoms and Interstitials in Two-Dimensional Colloidal Crystals.
The motion of a self-phoretic active particle in two-dimensional loosely packed colloidal crystals at fluid interfaces is studied to realize non-close-packed crystalline phases with internal activity.
Melting of two-dimensional tunable-diameter colloidal crystals.
The translational and orientational susceptibilities enabled us to definitively determine the phase transition points, avoiding ambiguities inherent in other analyses and resolving a "dislocation precursor stage" in the solid phase that some of the traditional analyses may incorrectly associate with the hexatic phase.
Active fluidization in dense glassy systems.
Using molecular dynamics simulations of a model glass former, it is shown that the incorporation of activity or self-propulsion, f0, can induce cage breaking and fluidization, resulting in the disappearance of the glassy phase beyond a critical f0.