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Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
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Drops retracting while forming a rim.

Rafael Tadmor1, Victor Multanen2, Yotam Stern2

  • 1Dept. of Mechanical Engineering, Ben Gurion University of the Negev, Beer Sheva, Israel; Dan Smith Dept. of Chemical Engineering, Lamar University, Beaumont, TX, United States.

Journal of Colloid and Interface Science
|August 18, 2020
PubMed
Summary
This summary is machine-generated.

Surfactant droplets retract after spreading, forming a liquid rim. Rim thickness depends on surfactant concentration, explained by modified triple line fluctuation theory and anisotropic adsorption.

Keywords:
AdsorptionFluctuationsSpreadingSurfactant

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Area of Science:

  • Surface science
  • Colloid and interface science
  • Physical chemistry

Background:

  • Surfactant-laden droplets exhibit complex spreading and retraction dynamics.
  • Understanding droplet behavior is crucial for applications in coatings, printing, and microfluidics.
  • The Marmur-Lelah model describes droplet retraction, but requires further refinement for anisotropic conditions.

Purpose of the Study:

  • To investigate the retraction mechanism of surfactant-laden droplets.
  • To test the hypothesis that de Gennes-type triple line fluctuation explains retraction.
  • To correlate retraction phenomena with anisotropic surfactant adsorption.

Main Methods:

  • High-speed imaging of oil-in-water droplets (tetradecane with octadecylamine) spreading on mica.
  • Controlled variation of surfactant concentrations.
  • Analysis of droplet spreading and subsequent retraction dynamics.

Main Results:

  • Droplet retraction leaves a liquid rim at the maximal spreading line.
  • Rim thickness is inversely proportional to surfactant concentration.
  • Findings align with a modified de Gennes triple line fluctuation expression accounting for anisotropic adsorption.

Conclusions:

  • Anisotropic surfactant adsorption drives droplet retraction.
  • The modified triple line fluctuation model accurately predicts rim formation.
  • Rim thickness can approach zero at very high surfactant concentrations.