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Phase Diagrams of Ternary Systems01:28

Phase Diagrams of Ternary Systems

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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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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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A phase transition is the process in which a substance changes from one state of matter to another, like from a solid to a liquid, liquid to gas, or vice versa, at a specific temperature and under given pressure conditions. This change is spontaneous and is affected by alterations in temperature and pressure. These parameters impact the strength of the forces between molecules (intermolecular forces) in the substance.During a phase transition, both the initial and final phases of the substance...
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Phase Transitions: Melting and Freezing02:39

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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Comparing two tetraalkylammonium ionic liquids. II. Phase transitions.

Thamires A Lima1, Vitor H Paschoal1, Luiz F O Faria1

  • 1Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, CP 26077, CEP 05513-970 São Paulo, SP, Brazil.

The Journal of Chemical Physics
|June 17, 2016
PubMed
Summary

Phase transitions in two ionic liquids were studied. Both exhibit glass transitions under high pressure, with structural changes observed during thermal events and conformational shifts in molecular structures.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Condensed Matter Physics

Background:

  • Ionic liquids (ILs) are salts that are liquid at ambient temperatures.
  • Understanding their phase transitions is crucial for applications in various fields.
  • Bis(trifluoromethanesulfonyl)imide-based ILs are widely studied due to their unique properties.

Purpose of the Study:

  • To investigate the phase transitions of n-butyl-trimethylammonium bis(trifluoromethanesulfonyl)imide ([N1114][NTf2]) and methyl-tributylammonium bis(trifluoromethanesulfonyl)imide ([N1444][NTf2]).
  • To explore the influence of temperature and high pressure on the structural behavior of these ILs.

Main Methods:

  • Differential scanning calorimetry (DSC) for thermal analysis.
  • X-ray diffraction (XRD) for structural characterization.
  • Raman spectroscopy (including high-pressure studies with a diamond anvil cell) for molecular-level insights.

Main Results:

  • [N1444][NTf2] shows a glass transition at low temperatures.
  • [N1114][NTf2] exhibits temperature-dependent crystallization behavior.
  • Both ILs undergo glass transitions under elevated pressure.
  • XRD and Raman spectroscopy revealed structural ordering/disordering during phase transitions (crystallization, glass transition, melting).
  • High-frequency Raman spectra indicated conformational changes in cation and anion structures.

Conclusions:

  • The study provides a comprehensive understanding of phase transitions in [N1114][NTf2] and [N1444][NTf2] under varying conditions.
  • Pressure significantly influences the glass transition behavior of these ionic liquids.
  • Molecular-level conformational changes accompany macroscopic phase transitions, offering insights into IL behavior.