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Related Concept Videos

Solid–Solid Solutions01:24

Solid–Solid Solutions

The temperature-composition phase diagram of two solids, A and B, which are immiscible in the solid phase but form miscible liquids, shows that when the temperature is low, these two exist as separate, pure solids (A and B). As the temperature increases, they transition into a single-phase liquid solution where A and B coexist. Moving from point a1 to a2 in the phase diagram, the composition changes such that solid B begins to separate from the solution, enriching the remaining liquid with A.
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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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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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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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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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Preparation of Binary and Ternary Deep Eutectic Systems
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Preparation of Binary and Ternary Deep Eutectic Systems

Published on: October 31, 2019

Glass transition in binary eutectic systems: best glass-forming composition.

Li-Min Wang1, Zijing Li, Zeming Chen

  • 1State Key Lab of Metastable Materials Science and Technology and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei, 066004 China. Limin_Wang@ysu.edu.cn

The Journal of Physical Chemistry. B
|August 25, 2010
PubMed
Summary
This summary is machine-generated.

This study on methyl o-toluate and methyl p-toluate systems reveals the optimal glass formation composition deviates from the eutectic point. This finding has implications for understanding glass-forming ability in binary mixtures.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Chemical Physics

Background:

  • Understanding glass transition and glass-forming ability is crucial for developing new materials.
  • Binary eutectic systems offer a fundamental model for studying vitrification phenomena.

Purpose of the Study:

  • To investigate the glass transition and glass-forming ability across the entire composition range of the methyl o-toluate (MOT) and methyl p-toluate (MPT) binary eutectic system.
  • To determine the optimal glass-forming composition and its relationship to the eutectic composition.

Main Methods:

  • Construction of the phase diagram to identify characteristic temperatures (glass transition, crystallization, eutectic, liquidus).
  • Dielectric measurements to analyze structural relaxation time and kinetic fragility.
  • Compilation and analysis of data from various binary eutectic systems (inorganic, metallic, ionic, molecular).

Main Results:

  • The optimal vitrification region was found between the eutectic and midpoint compositions, deviating significantly from the eutectic composition.
  • A general rule was reproduced across diverse binary eutectic systems.
  • Kinetic fragility and structural relaxation time showed composition dependence.
  • Mixing of miscible liquids kinetically favors glass formation.

Conclusions:

  • The best glass-forming composition in binary systems often deviates from the eutectic composition.
  • Both kinetic and thermodynamic factors contribute to the deviation of the optimal glass-forming composition from the eutectic point.
  • The findings provide insights into the fundamental principles governing glass formation in binary mixtures.