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Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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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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Updated: May 26, 2026

Production of Membrane-Filtered Phase-Shift Decafluorobutane Nanodroplets from Preformed Microbubbles
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Production of Membrane-Filtered Phase-Shift Decafluorobutane Nanodroplets from Preformed Microbubbles

Published on: March 23, 2021

Diffusive shielding stabilizes bulk nanobubble clusters.

Joost H Weijs1, James R T Seddon, Detlef Lohse

  • 1Physics of Fluids Group and J. M. Burgers Centre for Fluid Dynamics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|January 4, 2012
PubMed
Summary
This summary is machine-generated.

Bulk nanobubbles in clusters are stable against dissolution when closely spaced. This stability arises from a shielding effect, where nanobubbles protect each other from diffusion, as confirmed by molecular dynamics simulations.

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Area of Science:

  • Physics
  • Chemistry
  • Materials Science

Background:

  • Understanding the behavior of nanobubbles is crucial for various applications.
  • Bulk nanobubbles present unique nucleation and stability challenges compared to surface nanobubbles.

Purpose of the Study:

  • To investigate the nucleation and stability of bulk nanobubble clusters using molecular dynamics simulations.
  • To determine the conditions under which bulk nanobubbles remain stable against dissolution.

Main Methods:

  • Molecular dynamics simulations were employed to model the formation, growth, and final size of bulk nanobubbles.
  • Simple diffusion calculations were used to analyze and validate simulation results.

Main Results:

  • Bulk nanobubbles were found to be stable against dissolution when their interspacing is sufficiently small.
  • A shielding effect was identified, where clustered nanobubbles protect each other from diffusion.

Conclusions:

  • The close proximity of nanobubbles within a cluster is key to their stability.
  • The shielding effect provides a physical mechanism explaining the observed stability of bulk nanobubble clusters.