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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...
Solubility03:00

Solubility

Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules, atoms, and/or ions)...
Freezing Point Depression and Boiling Point Elevation01:24

Freezing Point Depression and Boiling Point Elevation

When a non-volatile solute is added to a pure solvent, it results in the lowering of the freezing point of the solvent. This phenomenon is called freezing point depression. The extent to which the freezing point is lowered depends on the molality of the solute -the number of moles of solute per kilogram of solvent and the cryoscopic constant of the solvent.From the plot of chemical potential, μ, against temperature, it is evident that the μ of both solid and liquid solvents decrease with...
Molecular Shape and Polarity03:37

Molecular Shape and Polarity

Dipole Moment of a Molecule
Energetics of Solution Formation02:35

Energetics of Solution Formation

The formation of a solution is an example of a spontaneous process, which is a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Formation of the solution requires the solute–solute and solvent–solvent electrostatic forces to...
Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

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Modulating Shape of Polyester Based Polymersomes using Osmotic Pressure
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Published on: April 21, 2021

Nanostructure changes in protic ionic liquids (PILs) through adding solutes and mixing PILs.

Tamar L Greaves1, Danielle F Kennedy, Nigel Kirby

  • 1CSIRO Materials Science and Engineering, Bag 10, Clayton, VIC 3169, Australia.

Physical Chemistry Chemical Physics : PCCP
|June 10, 2011
PubMed
Summary

Adding alcohols and hexane to protic ionic liquids (PILs) alters their nanostructure. Alcohol chain length matching PILs tunes non-polar domain size, while hexane has minimal impact, offering control over PIL nanostructure.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Supramolecular Chemistry

Background:

  • Protic ionic liquids (PILs) exhibit complex nanostructures crucial for their applications.
  • Understanding how external molecules like alcohols and alkanes interact with PILs is key to tailoring their properties.

Purpose of the Study:

  • To investigate the impact of primary n-alcohols and hexane on the nanostructure of various protic ionic liquids.
  • To explore the relationship between molecular structure (alkyl chain length, hydroxyl substitution) and nanostructure modification.
  • To assess the influence of solvent miscibility and co-partitioning on PIL nanodomains.

Main Methods:

  • Small and wide-angle X-ray scattering (SAXS/WAXS) were employed to analyze the nanostructure of 14 protic ionic liquids.
  • Systematic variation of PIL cation/anion structures and the addition of n-alcohols (ethanol, propanol, butanol) and hexane.
  • Investigation of binary PIL-PIL mixtures to understand nanostructure tunability.

Main Results:

  • PILs with non-polar domains showed miscibility with shorter-chain alcohols, leading to changes in domain size based on relative chain lengths.
  • Significant differences in chain length between alcohols and PIL cations resulted in large aggregate formation.
  • Hexane addition had minimal effect on nanostructure, likely due to lack of specific orientation within non-polar domains.
  • Solubility of hexane correlated strongly with PIL alkyl chain length.
  • Binary PIL-PIL mixtures allowed for fine-tuning of non-polar domain size and structure.

Conclusions:

  • The nanostructure of protic ionic liquids can be effectively modified by the addition of specific alcohols and alkanes.
  • Precise control over PIL nanostructure, particularly non-polar domain characteristics, is achievable by selecting solvents with appropriate chain lengths and exploring binary mixtures.
  • These findings provide a pathway for designing PILs with targeted properties for various applications.