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Colloids03:22

Colloids

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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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).
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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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The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Constituent- and Composition-Dependent Surfactant Aggregation in (Lanthanide Salt + Urea) Deep Eutectic Solvents.

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Deep eutectic solvents (DESs) influence surfactant self-assembly, with lanthanide salts and urea composition affecting critical aggregation concentration (CAC). SDS/CTAB aggregation is enthalpically driven at low urea, becoming entropically favored at higher concentrations.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Deep eutectic solvents (DESs) offer tunable physicochemical properties for diverse applications.
  • Surfactant self-assembly in DESs is influenced by surfactant headgroup charge and DES composition.
  • Understanding these interactions is crucial for designing novel functional materials.

Purpose of the Study:

  • To investigate the self-aggregation behavior of sodium dodecylsulfate (SDS), cetyltrimethylammonium bromide (CTAB), and Triton X-100 (TX-100) in lanthanide (Ln)/urea (U) DESs.
  • To determine the effect of metal salt identity (La vs. Ce) and urea composition on the critical aggregation concentration (CAC).
  • To elucidate the thermodynamic driving forces behind surfactant self-assembly in these DESs.

Main Methods:

  • Utilized fluorescence probe (pyrene-1-carboxaldehyde), electrical conductance, and surface tension measurements.
  • Determined Critical Aggregation Concentration (CAC) for three surfactants in various Ln/U DESs.
  • Estimated thermodynamic parameters (ΔG°agg, ΔH°agg, ΔS°agg) from temperature-dependent CAC data.

Main Results:

  • SDS exhibited significantly lower CAC in 1:3.5 (Ln/U) DESs compared to water; CTAB and TX-100 showed marginally higher CAC.
  • Metal salt identity (La vs. Ce) had minimal impact on CAC.
  • Increasing urea content raised CAC for SDS and CTAB but slightly decreased it for TX-100.
  • SDS/CTAB self-assembly shifted from enthalpically to entropically driven with increased urea; TX-100 aggregation remained enthalpically favored.

Conclusions:

  • DES composition, particularly urea content, significantly modulates surfactant self-assembly behavior.
  • The thermodynamic nature of self-aggregation (enthalpic vs. entropic) is dependent on surfactant type and DES composition.
  • These findings provide insights into the complex interactions governing surfactant behavior in DESs, aiding in the design of tailored systems.