Direct observation in 3d of structural crossover in binary hard sphere mixtures.

  title={Direct observation in 3d of structural crossover in binary hard sphere mixtures.},
  author={Antonia Statt and Rattachai Pinchaipat and Francesco Turci and Robert Evans and C. Patrick Royall},
  journal={The Journal of chemical physics},
  volume={144 14},
For binary fluid mixtures of spherical particles in which the two species are sufficiently different in size, the dominant wavelength of oscillations of the pair correlation functions is predicted to change from roughly the diameter of the large species to that of the small species along a sharp crossover line in the phase diagram [C. Grodon et al., J. Chem. Phys. 121, 7869 (2004)]. Using particle-resolved colloid experiments in 3d we demonstrate that crossover exists and that its location in… 

Figures from this paper

Connecting Packing Efficiency of Binary Hard Sphere Systems to Their Intermediate Range Structure
Using computed x-ray tomography we determine the three dimensional (3d) structure of binary hard sphere mixtures as a function of composition and size ratio of the particles, q. Using a recently
Thermodynamic behavior of binary mixtures of hard spheres: Semianalytical solutions on a Husimi lattice built with cubes.
We study binary mixtures of hard particles, which exclude up to their kth nearest neighbors (kNN) on the simple cubic lattice and have activities z_{k}. In the first model analyzed, point particles
Structure factors in a two-dimensional binary colloidal hard sphere system
ABSTRACT Hard disks are one of the simplest interacting many-body model system in two dimensions (2D). Here, we present a comprehensive set of measurements of the static structure factors for
Structural crossover in a model fluid exhibiting two length scales: Repercussions for quasicrystal formation.
It is argued that identifying and following a crossover line in the phase diagram towards higher densities where the solid phase(s) occur is a good strategy for finding quasicrystals in a wide variety of systems.
Structural properties of additive binary hard-sphere mixtures. II. Asymptotic behavior and structural crossovers.
The so-called rational-function approximation method and an approach combining accurate molecular dynamics simulation data, the pole structure representation of the total correlation functions, and the Ornstein-Zernike equation are considered are considered.
Screening Lengths in Ionic Fluids.
This analysis provides an explanation for the recently observed discontinuous change in the structural force across a thin film of ionic liquid-solvent mixtures as the composition is varied, as well as reframes recent debates about the screening length in concentrated electrolytes.
Structural properties of additive binary hard-sphere mixtures.
A very good overall agreement between the results of the present scheme and those of the RFA is found, suggesting that the latter (which is an improvement over the PY approximation) can safely be used to predict reasonably well the long-range behavior of the correlation functions of additive binary hard-sphere mixtures.
Integral equation theory of thermodynamics, pair structure, and growing static length scale in metastable hard sphere and Weeks-Chandler-Andersen fluids.
We employ the Ornstein-Zernike integral equation theory with the Percus-Yevick (PY) and modified-Verlet (MV) closures to study the equilibrium structural and thermodynamic properties of metastable
Characterizing randomness in photonic glasses using autocorrelation functions of two-dimensional images.
A simple method to quantify randomness in photonic glasses in relation to the ideal random limit, using autocorrelation functions obtained from two-dimensional images, which would be useful in characterizing a large class of photonic random media, encompassing biological materials, radiative cooling coatings, and random lasing Photonic glasses.
Dynamic decay and superadiabatic forces in the van Hove dynamics of bulk hard sphere fluids
We study the dynamical decay of the van Hove function of Brownian hard spheres using event-driven Brownian dynamics simulations and dynamic test particle theory. Relevant decays mechanisms include


Experimental observation of structural crossover in binary mixtures of colloidal hard spheres.
A relation between crossover and the lateral extension of networks containing only equally-sized particles that are connected by nearest-neighbor bonds is suggested, supported by Monte Carlo simulations which are performed at different packing fractions and size ratios.
Decay of correlation functions in hard-sphere mixtures: structural crossover.
It is shown that structural crossover also manifests itself in the intermediate range behavior of the pair correlation functions and the relevance of this observation for real (colloidal) mixtures is commented on.
Superlattice formation in binary mixtures of hard-sphere colloids.
Binary mixtures of suspended hard-sphere colloidal particles, radius ratio R B /R A =0.58, were observed to undergo entropically driven freezing transitions into both the AB 2 and AB 13 superlattice
Decay of Correlations in Linear Systems
The conditions under which the decay of the pair correlation function at large distances is monotonic or oscillatory are investigated for one‐dimensional systems and discussed in detail for certain
On measuring colloidal volume fractions
Hard-sphere colloids are popular as models for testing fundamental theories in condensed matter and statistical physics, from crystal nucleation to the glass transition. A single parameter, the
Connection between the packing efficiency of binary hard spheres and the glass-forming ability of bulk metallic glasses.
The results emphasize that maximizing GFA in binary systems involves two competing effects: minimizing α to increase packing efficiency, while maximizing α to prevent demixing.
In search of colloidal hard spheres
We recently reviewed the experimental determination of the volume fraction, ϕ, of hard-sphere colloids, and concluded that the absolute value of ϕ was unlikely to be known to better than ±3–6%. Here,
Effect of particle size and Debye length on order parameters of colloidal silica suspensions under confinement
Using atomic force microscopy (AFM) and small angle X-ray scattering (SAXS), we show a full comparison between structuring of nanoparticles in confinement and in bulk in order to explain the effect
Decay of the pair correlations and small-angle scattering for binary liquids and glasses
The origin of extended-range ordering in binary liquids and glasses is investigated. The starting point is a simple model pair potential which includes both Coulomb and dispersion forces. For this
Phase diagram and structural diversity of the densest binary sphere packings.
This work presents the most comprehensive determination to date of the phase diagram in (α,x) for the densest binary sphere packings and finds many distinct new densest packings.