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Updated: Aug 6, 2025

Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids
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Surface viscosity in simple liquids.

Paolo Malgaretti1, Ubaldo Bafile2, Renzo Vallauri2

  • 1Forschungszentrum Jülich GmbH, Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Cauerstr.1, D-91058 Erlangen, Germany.

The Journal of Chemical Physics
|March 22, 2023
PubMed
Summary
This summary is machine-generated.

A novel surface viscosity was discovered in simple liquids, distinct from bulk viscosity. This finding impacts our understanding of interfacial fluid dynamics and surface reactions.

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Area of Science:

  • Fluid dynamics
  • Surface chemistry
  • Materials science

Background:

  • Newtonian liquids are typically characterized by homogeneous transport coefficients like viscosity.
  • Strong density gradients at liquid/vapor interfaces suggest the potential for inhomogeneous viscosity.
  • Existing models may not fully capture the complexities of interfacial fluid behavior.

Purpose of the Study:

  • To investigate the emergence of surface viscosity at liquid/vapor interfaces.
  • To quantify the relationship between surface and bulk viscosity in simple liquids.
  • To explore the implications of interfacial viscosity for chemical processes.

Main Methods:

  • Utilizing molecular simulations to model simple liquids at their liquid/vapor boundary.
  • Analyzing the collective dynamics of interfacial layers to identify emergent properties.
  • Estimating the surface viscosity based on simulation data.

Main Results:

  • A distinct surface viscosity was observed to emerge from the collective dynamics of interfacial layers.
  • The estimated surface viscosity is 8-16 times smaller than the bulk fluid viscosity.
  • The study provides quantitative data on inhomogeneous viscosity at fluid interfaces.

Conclusions:

  • Surface viscosity is a real phenomenon arising from interfacial layer dynamics.
  • The reduced surface viscosity has significant implications for surface-driven reactions.
  • This research opens new avenues for understanding interfacial phenomena in atmospheric chemistry and catalysis.