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A Single-Component System01:24

A Single-Component System

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In the field of chemistry, the terms "component" and "phase" hold significant importance. A component refers to a chemically distinct substance in a system that has specific properties. It is chemically homogeneous, meaning it has the same properties throughout. For example, in a mixture of salt and water, both salt and water are considered separate components because they have different chemical properties.On the other hand, a phase is a form of matter that has a consistent chemical...
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Two Components: Liquid–Liquid Systems01:27

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A pressure-composition phase diagram explicitly describes the behavior of an ideal solution of two volatile liquids under varying pressures and compositions. A pressure-composition diagram has two main curves. The bubble point curve represents the plot of pressure versus liquid mole fraction. It indicates the pressure at which the first bubble of vapor forms from the liquid phase as the system pressure decreases.The dew point curve is the pressure versus vapor mole fraction. It indicates the...
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The Phase Rule01:20

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The phase rule describes the relationship between the variance (degrees of freedom), the number of components, and the number of phases in a system at equilibrium.Variance is a concept that denotes the number of independent intensive properties (properties are those that do not depend on the amount of material in the system), such as temperature, pressure, and composition, that can be altered without impacting the number of phases in equilibrium.In a single-component system, such as pure water,...
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Phase Diagrams of Ternary Systems01:28

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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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Nonideal Two-Component Liquid Solutions01:29

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Nonideal liquid solutions, also known as real solutions, do not strictly follow Raoult's law. Raoult's law is a rule of thumb in physical chemistry. However, not all mixtures adhere to this law due to varying molecular interactions. For example, in an acetone/chloroform solution, the individual vapor pressures of the components are lower than expected, resulting in a total vapor pressure below that predicted by Raoult's law, causing a negative deviation.On the other hand, in an ethanol/water...
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Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution,...
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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A possible four-phase coexistence in a single-component system.

Kenji Akahane1, John Russo1,2, Hajime Tanaka1

  • 1Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan.

Nature Communications
|August 26, 2016
PubMed
Summary
This summary is machine-generated.

Researchers generalized the Gibbs phase rule, enabling four phases to coexist in single-component systems by adjusting model parameters. This discovery of a quadruple point offers new control over equilibrium phases in tunable soft matter systems.

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Area of Science:

  • Thermodynamics
  • Materials Science
  • Physical Chemistry

Background:

  • The Gibbs phase rule traditionally limits single-component systems to a maximum of three coexisting phases at equilibrium.
  • This rule is a fundamental concept in thermodynamics, governing phase equilibria.
  • Understanding phase coexistence is crucial for materials design and chemical processes.

Purpose of the Study:

  • To generalize the Gibbs phase rule for single-component systems.
  • To investigate the conditions under which four phases can coexist.
  • To identify and characterize the quadruple point in a model system.

Main Methods:

  • Utilized a monoatomic system with a Stillinger-Weber potential.
  • Varied model parameters, specifically tetrahedrality, to explore phase space.
  • Systematically searched for the quadruple point where four phases coexist.

Main Results:

  • Demonstrated that the Gibbs phase rule can be generalized to allow four coexisting phases in a single-component system.
  • Identified a quadruple point by tuning the Stillinger-Weber potential's tetrahedrality parameter.
  • Showcased the potential for controlling multiple equilibrium phases.

Conclusions:

  • The quadruple point offers enhanced flexibility in managing multiple equilibrium phases.
  • Systems with tunable interactions, such as soft matter systems (e.g., patchy colloids), can realize quadruple points.
  • This generalization has implications for understanding and manipulating phase behavior in advanced materials.