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Related Concept Videos

The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
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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...
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

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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Polymer Classification: Crystallinity01:21

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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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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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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Lyotropic liquid crystalline phase behaviour in amphiphile-protic ionic liquid systems.

Zhengfei Chen1, Tamar L Greaves, Celesta Fong

  • 1PFPC, School of Chemistry, The University of Melbourne, Melbourne, Victoria 3010, Australia.

Physical Chemistry Chemical Physics : PCCP
|February 14, 2012
PubMed
Summary

Phase diagrams for amphiphile-protic ionic liquid (PIL) systems reveal liquid crystalline phases at high concentrations. These PIL systems exhibit thermal stability above 100°C, offering insights into amphiphile self-assembly.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Supramolecular Chemistry

Background:

  • Amphiphiles and protic ionic liquids (PILs) are key components in various advanced materials.
  • Understanding their phase behavior is crucial for designing novel functional systems.
  • Previous studies have explored amphiphile-water interactions, but PIL systems remain less characterized.

Purpose of the Study:

  • To determine approximate partial phase diagrams for nine amphiphile-PIL systems.
  • To investigate the influence of PIL properties on amphiphile self-assembly.
  • To compare the phase behavior of amphiphiles in PILs versus water.

Main Methods:

  • Synchrotron source small-angle X-ray scattering (SAXS)
  • Differential scanning calorimetry (DSC)
  • Cross-polarized optical microscopy

Main Results:

  • Lyotropic liquid crystalline phases (hexagonal, cubic, lamellar) formed at >50 wt% amphiphile concentrations.
  • Micelles or polydisperse crystals observed at <40 wt% amphiphile concentrations.
  • Most surfactant-PIL phases demonstrated thermal stability above 100 °C, with Brij 97 being an exception.

Conclusions:

  • The phase behavior of amphiphile-PIL systems is influenced by PIL cohesive energy, nanoscale order, polarity, and ionicity.
  • Amphiphile-PIL systems offer thermally stable liquid crystalline phases suitable for advanced applications.
  • Comparative studies with water highlight the unique interactions within PIL-based systems.