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Related Concept Videos

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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 experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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Bubbles nucleation in supersaturated emulsion drops.

Ivan Lesov1, George I Georgiev2, Jessica Delavoipiere3

  • 1Department of Chemical and Pharmaceutical Engineering, Faculty of Chemistry and Pharmacy, Sofia University "St. Kliment Ohridski", 1 James Bourchier Ave, Sofia, 1164, Bulgaria. lesov@lcpe.uni-sofia.bg.

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|July 2, 2025
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Summary
This summary is machine-generated.

This study reveals how to control bubble nucleation in emulsions by adjusting fluid properties and mixing. Understanding these factors allows for optimized bubble formation and size in emulsion-based materials.

Keywords:
Bubble nucleationFoamed emulsionsNucleation in emulsionsShear nucleationSupersaturated emulsions

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Fluid Dynamics

Background:

  • Bubble nucleation is crucial in diverse industrial applications.
  • Mechanisms in emulsions remain less understood compared to homogeneous solutions.
  • Controlling bubble formation in emulsions is key for material design.

Purpose of the Study:

  • To investigate bubble nucleation and growth in emulsions under varying conditions.
  • To explore the influence of physicochemical properties and mixing hydrodynamics.
  • To establish pathways for designing bubble characteristics in emulsions.

Main Methods:

  • Emulsification of supersaturated oils followed by rapid decompression.
  • Systematic variation of gas saturation pressure, viscosities, gas solubility, and mixing intensity.
  • Analysis via emulsion volume monitoring and optical microscopy.

Main Results:

  • Bubble nucleation primarily occurs via a heterogeneous mechanism, enhanced by shear and gas migration.
  • Increased oil phase viscosity promotes bubble formation and retention.
  • Higher aqueous phase viscosity inhibits nucleation in the continuous phase.

Conclusions:

  • Physicochemical properties and mixing hydrodynamics significantly influence bubble nucleation and growth.
  • Tailoring these parameters allows for control over bubble size and distribution.
  • Findings provide a basis for optimizing pore size distribution in emulsion-derived materials.