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Colloidal precipitates01:09

Colloidal precipitates

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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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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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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
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Synthesis and Characterization of Supramolecular Colloids
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Patchy rough colloids as Pickering stabilizers.

Hannah M H Weijgertze1, Willem K Kegel, Michele Zanini

  • 1Van't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute for Nanomaterials Science, Utrecht University, Utrecht, The Netherlands. michele.zanini.mfz@gmail.com W.K.Kegel@uu.nl.

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|August 12, 2020
PubMed
Summary

This study explores how rough, heterogeneous Pickering stabilizers impact emulsion properties. Surface structuring of these particles, unlike smooth ones, significantly influences emulsification and phase inversion, offering new formulation possibilities.

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Area of Science:

  • Colloid and Surface Science
  • Materials Chemistry
  • Emulsion Technology

Background:

  • Pickering stabilizers are typically assumed to be smooth and homogeneous.
  • The influence of surface roughness and chemical heterogeneity on emulsion properties is not well understood.

Purpose of the Study:

  • To investigate the role of surface structuring in the emulsification and catastrophic phase inversion of Pickering emulsions.
  • To understand how particle heterogeneity affects emulsion formation and formulation.

Main Methods:

  • Fabrication of patchy rough particles with a polystyrene core and organosilicate asperities.
  • Characterization of geometrical roughness using Atomic Force Microscopy (AFM).
  • Determination of chemical composition via oxidative mass loss upon combustion and wetting studies.

Main Results:

  • Synthesis produces scalable, robust patchy rough particles with coupled surface roughness and chemical heterogeneity.
  • Systematic variations in emulsification parameters reveal the significant influence of particle heterogeneity on emulsion formation.
  • Empirical wetting studies align with theoretically derived contact angles.

Conclusions:

  • Surface structuring and heterogeneity of Pickering stabilizers fundamentally alter emulsion properties.
  • This research provides insights into the behavior of non-ideal particles in Pickering emulsions.
  • The findings pave the way for designing novel emulsions using heterogeneous particles.