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Related Concept Videos

Two Components: Liquid–Liquid Systems01:27

Two Components: Liquid–Liquid Systems

27
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...
27
Solid–Solid Solutions01:24

Solid–Solid Solutions

18
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.
18
Nonideal Two-Component Liquid Solutions01:29

Nonideal Two-Component Liquid Solutions

19
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...
19
Liquid–Solid Solutions01:29

Liquid–Solid Solutions

14
The process of a solid dissolving in a liquid to form a solution is governed by the solubility limit, which is the maximum amount of the solid substance, or solute, that can be dissolved in a specific volume of the liquid or solvent. As the solute dissolves, it reaches a point where no more solute can be dissolved at a given temperature - this is known as the saturation point. However, if further solute is added and it manages to dissolve, the solution becomes supersaturated. Supersaturated...
14
Electrochemical Systems01:24

Electrochemical Systems

19
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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Phase Diagram01:19

Phase Diagram

7.1K
The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).
7.1K

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Related Experiment Video

Updated: Feb 27, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

69.7K

Two coexisting liquid phases in switchable ionic liquids.

Juan Yao1, David B Lao2, Xiao Sui1

  • 1Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99352, USA. xiaoying.yu@pnnl.gov.

Physical Chemistry Chemical Physics : PCCP
|July 1, 2017
PubMed
Summary
This summary is machine-generated.

Switchable ionic liquids (SWILs) reveal a complex, heterogeneous structure with two liquid phases. This discovery, using advanced chemical mapping, deepens our understanding of SWIL behavior and applications.

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Area of Science:

  • Chemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Switchable ionic liquids (SWILs) are versatile materials derived from organic bases and alcohols.
  • SWILs show promise in gas capture, separations, and nanomaterial synthesis.
  • The precise solvent structure of SWILs remains largely uncharacterized.

Purpose of the Study:

  • To elucidate the molecular structure of switchable ionic liquids.
  • To investigate the chemical speciation within SWILs.
  • To understand how SWIL structure influences their properties and applications.

Main Methods:

  • Utilized in situ time-of-flight secondary ion mass spectrometry (TOF-SIMS) for chemical mapping.
  • Employed spectral principal component analysis (PCA) for data interpretation.
  • Analyzed SWILs to identify distinct molecular species and phases.

Main Results:

  • Discovered two coexisting liquid phases within the SWILs, indicating a heterogeneous structure.
  • Identified complex chemical speciation beyond simple stoichiometry, including dimers and ionic clusters.
  • Confirmed unique molecular structures distinct from conventional ionic liquids.

Conclusions:

  • The study provides the first chemical map of SWIL solvent structure.
  • SWILs exhibit a heterogeneous liquid nature with complex molecular arrangements.
  • This advanced understanding of SWIL structure is crucial for optimizing their physical properties and applications.