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Direct observation in 3d of structural crossover in binary hard sphere mixtures
Antonia Statt1, Rattachai Pinchaipat2, Francesco Turci2
1Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudinger Weg 9, 55128 Mainz, Germany.
The Journal of Chemical Physics
|April 17, 2016
Summary
Binary fluid mixtures exhibit a structural crossover, where dominant wavelengths shift between large and small particle sizes. This study confirms the crossover
Area of Science:
- Soft Matter Physics
- Colloidal Systems
- Statistical Mechanics
Background:
- Binary fluid mixtures of spherical particles with significant size differences exhibit complex phase behavior.
- Theoretical predictions suggest a sharp crossover line in the phase diagram where the dominant wavelength of pair correlation function oscillations changes.
- Previous studies have linked this crossover to percolation phenomena.
Purpose of the Study:
- To experimentally verify the existence of a structural crossover in binary fluid mixtures of differently sized spherical particles.
- To quantitatively compare the location of this crossover in the phase diagram with theoretical predictions and simulation results.
- To investigate the relationship between structural crossover and percolation in these systems.
Main Methods:
- Particle-resolved colloid experiments in three dimensions (3D).
- Monte Carlo simulations.
- Analysis of pair correlation functions and their dominant wavelengths.
- Percolation analysis.
Main Results:
- Experimental evidence confirms the existence of a structural crossover in binary fluid mixtures.
- The experimentally determined crossover line in the phase diagram agrees quantitatively with theoretical and simulation data.
- Structural crossover was found to be independent of percolation of either particle species, contradicting some previous findings.
Conclusions:
- The structural crossover phenomenon in binary colloidal fluids is experimentally validated.
- The quantitative agreement across experiments, theory, and simulations strengthens the understanding of this crossover.
- The independence of structural crossover from percolation highlights a key distinction in the system's behavior.
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