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Consider a ternary system, which is composed of three components: water (W), ethanoic acid (E), and trichloromethane (T). Here, Ethanoic acid (E) is fully miscible with both water (W) and trichloromethane (T), meaning it can mix entirely with either of them. However, water and trichloromethane have partial miscibility, meaning they can only mix to a certain extent, beyond which two separate phases will form.The phase diagram of a ternary system is represented as an equilateral triangle, where...

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Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly

Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly

Published on: November 4, 2021

Inherent structures of phase-separating binary mixtures: nucleation, spinodal decomposition, and pattern formation.

Sarmistha Sarkar¹, Biman Bagchi

¹Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|April 27, 2011

Summary

Phase separation in binary mixtures is visualized using an energy landscape. Structure-breaking liquids exhibit greater entropy stabilization, influencing phase behavior and viscosity.

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Area of Science:

Physical Chemistry
Materials Science
Computational Chemistry

Background:

Understanding phase separation and nonideality in binary mixtures is crucial for materials design.
The potential energy landscape (PEL) provides insights into the complex behavior of liquids.

Purpose of the Study:

To develop an energy landscape view of phase separation and nonideality in binary mixtures.
To explore the relationship between temperature, composition, and system behavior.

Main Methods:

Utilizing molecular dynamics simulations to study a model binary liquid.
Analyzing the potential energy landscape (PEL) by examining inherent structures (IS).
Calculating inherent structure energy by removing kinetic energy and intermolecular vibrations.

Main Results:

Structure-breaking liquids show broader inherent structure energy distributions, indicating greater entropy's role.
At high temperatures, homogenous parent structures yield phase-separated inherent structures.
Phase separation patterns correlate with inherent structure energy, showing spinodal decomposition and nucleation-type growth.

Conclusions:

The PEL framework effectively visualizes phase separation and nonideality in binary mixtures.
Entropy plays a significant role in stabilizing structure-breaking binary mixtures.
Viscosity in nonideal mixtures is anticorrelated with average inherent structure energy.