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Related Concept Videos

Factors Affecting Dissolution: Particle Size and Effective Surface Area01:23

Factors Affecting Dissolution: Particle Size and Effective Surface Area

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 employed to...

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Probing Surface Electrochemical Activity of Nanomaterials using a Hybrid Atomic Force Microscope-Scanning Electrochemical Microscope (AFM-SECM)
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Why surface nanobubbles live for hours.

Joost H Weijs1, Detlef Lohse

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

Physical Review Letters
|February 19, 2013
PubMed
Summary
This summary is machine-generated.

Surface nanobubbles have surprisingly long lifetimes, lasting hours to days. This is due to limited gas diffusion, cooperative clustering, and pinned contact lines, explaining their unexpected stability.

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Area of Science:

  • Physics
  • Physical Chemistry
  • Surface Science

Background:

  • Surface nanobubbles are nanoscale gas pockets trapped at liquid-solid interfaces.
  • Their experimentally observed lifetimes are orders of magnitude longer than theoretical predictions.
  • Understanding nanobubble stability is crucial for applications in nanotechnology and materials science.

Purpose of the Study:

  • To develop a theoretical model explaining the exceptionally long lifetimes of surface nanobubbles.
  • To identify the key physical mechanisms responsible for nanobubble stability under ambient conditions.

Main Methods:

  • Theoretical modeling of gas diffusion dynamics near interfaces.
  • Analysis of cooperative effects in nanobubble clusters.
  • Investigation of contact line pinning phenomena.

Main Results:

  • The theoretical model successfully explains the prolonged stability of surface nanobubbles.
  • Limited far-field gas diffusion significantly slows down dissolution.
  • Cooperative effects in nanobubble clusters and contact line pinning further enhance stability.

Conclusions:

  • The counterintuitive long lifetimes of surface nanobubbles are attributed to a combination of factors.
  • These factors collectively reduce the gas dissolution rate, leading to stability over hours or days.
  • The model provides a framework for understanding and potentially controlling nanobubble behavior.