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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

445
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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Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
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Factors Affecting Dissolution: Particle Size and Effective Surface Area01:23

Factors Affecting Dissolution: Particle Size and Effective Surface Area

614
Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are...
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Updated: May 13, 2025

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Ionic adsorption on bulk nanobubble interfaces and its uncertain role in diffusive stability.

Duncan Dockar1, Patrick Sullivan2, Jacqueline Mifsud3

  • 1School of Engineering, Institute for Multiscale Thermofluids, University of Edinburgh, Edinburgh, EH9 3FB, UK.

Journal of Colloid and Interface Science
|May 10, 2025
PubMed
Summary

Molecular Dynamics simulations show ions adsorb to nanobubble surfaces, creating an electric double layer (EDL). However, electrostatic stress does not stabilize nanobubbles, challenging prior theories on their long lifetimes.

Keywords:
Bulk nanobubblesElectrostaticsMolecular Dynamics simulationsStabilityZeta potential

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Area of Science:

  • Physical Chemistry
  • Nanotechnology
  • Computational Science

Background:

  • Bulk nanobubbles are proposed for applications like water treatment and theranostics.
  • Their long lifetimes contradict classical bubble dynamics, with electrostatic stability as a leading hypothesis.
  • Experimental observations of negative zeta potentials support the electrostatic mechanism.

Purpose of the Study:

  • Investigate the electrostatic stability mechanism of bulk nanobubbles.
  • Model ionic adsorption and zeta potential at the liquid-gas interface using simulations.
  • Critically examine the role of electrostatic stress in nanobubble longevity.

Main Methods:

  • High-fidelity Molecular Dynamics simulations.
  • Modeling bulk nanobubbles in sodium iodide electrolyte solution.
  • Analysis of ionic adsorption and electric double layer (EDL) formation.

Main Results:

  • Simulations confirm ion adsorption and EDL formation, consistent with experimental zeta potential measurements.
  • No significant electrostatic stress was found acting on the nanobubble surface.
  • Internal gas pressure is accurately predicted by the Laplace pressure equation, even with Tolman length correction.

Conclusions:

  • The proposed electrostatic stress mechanism does not appear to stabilize bulk nanobubbles against dissolution.
  • Water molecule rearrangement neutralizes ion charge density within the EDL.
  • Alternative mechanisms for nanobubble stability require further investigation.