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Colloidal precipitates01:09

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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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Optimization of Crystal Growth for Neutron Macromolecular Crystallography
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Published on: March 13, 2021

Nucleation in premicellar aggregation.

C P Loran1, R Von Wandruszka

  • 1Department of Chemistry, University of Idaho, Moscow, ID 83843, U.S.A.

Talanta
|May 1, 1991
PubMed
Summary
This summary is machine-generated.

Cholesterol acts as a nucleating agent, significantly influencing the premicellar aggregation of sodium lauryl sulfate (SLS) and other detergents. This nucleation affects aggregate structure and accessibility, impacting their properties.

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Area of Science:

  • Colloid and Surface Chemistry
  • Supramolecular Chemistry
  • Physical Chemistry

Background:

  • Detergents self-assemble into micelles above a critical concentration.
  • Nucleating agents can influence the initial stages of aggregation.
  • Understanding premicellar aggregation is crucial for controlling solution properties.

Purpose of the Study:

  • Investigate cholesterol's role as a nucleating agent in premicellar aggregation.
  • Compare nucleation effects across different types of detergents.
  • Characterize the structure of nucleated aggregates.

Main Methods:

  • Utilized pyrene fluorescence spectroscopy (I(1)/I(3) ratios) to probe aggregation.
  • Employed quenching studies to assess aggregate accessibility.
  • Applied energy transfer measurements to analyze aggregate structure.

Main Results:

  • Cholesterol strongly nucleated sodium lauryl sulfate (SLS) premicellar aggregates.
  • Other detergents (cetyltrimethylammonium bromide, Triton X-405, Brij 35) showed lesser nucleation by cholesterol.
  • Quenching and energy transfer data revealed distinct aggregate structures for Brij 35 and Triton X-405.

Conclusions:

  • Cholesterol's nucleation effect varies significantly among different detergent types.
  • Nucleated aggregates can exhibit different structural properties (e.g., openness, water accessibility) compared to self-assembled structures.
  • These findings provide insights into the initial steps of detergent aggregation influenced by additives.