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Simple and complex disorder in binary mixtures with benzene as a common solvent.
Martina Požar1, Jean-Baptiste Seguier, Jonas Guerche
1Department of Physics, Faculty of Sciences, University of Split, Nikole Tesle 12, 21000, Split, Croatia.
Physical Chemistry Chemical Physics : PCCP
|March 18, 2015
Summary
Computer simulations reveal benzene as a useful solvent for studying mixture disorder. Ethanol-benzene mixtures exhibit micro-segregation, confirming domain-domain correlations and micro-heterogeneity, unlike in aqueous mixtures.
Area of Science:
- Physical Chemistry
- Computational Chemistry
- Materials Science
Background:
- Studying disorder in binary mixtures is complex, especially with water.
- Benzene offers an alternative solvent for simulations, simplifying the analysis of molecular interactions and disorder.
Purpose of the Study:
- To investigate the relationship between local molecular order and global disorder in binary mixtures using benzene as a solvent.
- To analyze concentration fluctuations, correlation functions, and structure factors to understand mixture behavior.
- To compare the simulation results with those obtained using water as a solvent.
Main Methods:
- Computer simulations of binary mixtures (alkane-benzene, acetone-benzene, ethanol-benzene).
- Analysis of concentration fluctuations, correlation functions, and structure factors.
- Comparison of simulation results between benzene and water solvent systems.
Main Results:
- Alkane-benzene mixtures behave nearly ideally.
- Acetone-benzene mixtures exhibit characteristics of regular mixtures.
- Ethanol-benzene mixtures demonstrate significant micro-segregation, with observable domain-domain correlations.
- Benzene simulations confirmed micro-heterogeneity via a pre-peak in the structure factor, consistent with previous aqueous-alcohol mixture studies.
Conclusions:
- Benzene is a valuable solvent for simulating mixture disorder, overcoming limitations encountered with water.
- The study confirms micro-heterogeneity in ethanol-benzene mixtures and highlights differences in solvent behavior compared to water.
- The concept of molecular emulsion aids in understanding the distinct properties of water and benzene as solvents.
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