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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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Pickering emulsions stabilized by surface-modified Fe3O4 nanoparticles.

Jun Zhou1, Lijun Wang, Xiuying Qiao

  • 1State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China.

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|December 1, 2011
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Surface modification of iron(3) oxide (Fe(3)O(4)) nanoparticles enhances Pickering emulsion stability. Silane-coated nanoparticles effectively stabilize polar oil-in-water emulsions, unlike unmodified or carboxylic acid-modified nanoparticles.

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Area of Science:

  • Materials Science
  • Colloid and Surface Chemistry

Background:

  • Pickering emulsions are stabilized by solid particles, offering an alternative to traditional surfactants.
  • Unmodified iron(3) oxide (Fe(3)O(4)) nanoparticles show limited efficacy in stabilizing emulsions of polar oils like butyl butyrate.

Purpose of the Study:

  • To investigate the effect of surface modification on Fe(3)O(4) nanoparticle hydrophobicity and their ability to stabilize Pickering emulsions.
  • To compare the stabilizing performance of carboxylic acid-modified and silane-modified Fe(3)O(4) nanoparticles for both non-polar and polar oil-in-water systems.

Main Methods:

  • Surface modification of Fe(3)O(4) nanoparticles using carboxylic acid (RCOOH) and silane coupling agents (RSi(OC(2)H(5))(3)).
  • Preparation and stability assessment of dodecane-in-water and butyl butyrate-in-water Pickering emulsions using modified nanoparticles.
  • Thermal gravimetric analysis (TGA) to quantify surface modification and assess hydrophobicity.

Main Results:

  • Carboxylic acid modification decreased the stability of dodecane-in-water emulsions with increasing alkyl chain length and coating extent.
  • Carboxylic acid-modified Fe(3)O(4) nanoparticles failed to stabilize butyl butyrate-in-water emulsions.
  • Silane-coated Fe(3)O(4) nanoparticles successfully stabilized butyl butyrate-in-water emulsions and enhanced the stability of dodecane-in-water emulsions.
  • TGA revealed a higher molar quantity of silane reagent on nanoparticle surfaces, indicating increased hydrophobicity.

Conclusions:

  • Surface hydrophobicity is critical for stabilizing Pickering emulsions, especially with polar oils.
  • Silane modification of Fe(3)O(4) nanoparticles provides superior hydrophobicity and emulsion stabilization compared to carboxylic acid modification.
  • Tailoring nanoparticle surface chemistry is key to controlling Pickering emulsion stability for diverse oil phases.