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Related Concept Videos

Surface Active Agents01:27

Surface Active Agents

Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...
Micelles01:30

Micelles

Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...

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Fluorescence Recovery after Merging a Droplet to Measure the Two-dimensional Diffusion of a Phospholipid Monolayer
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Depinning of Multiphase Fluid Using Light and Photo-Responsive Surfactants.

Lei Zhao1, Serena Seshadri2, Xichen Liang3

  • 1Department of Mechanical Engineering, University of California, Santa Barbara, Santa Barbara, California 93106-5070, United States.

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|March 2, 2022
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Summary

Researchers developed a new method using light-activated surfactants to rapidly remove droplets and bubbles from surfaces. This photo-Marangoni effect offers a fast and efficient way to detach liquid droplets and gas bubbles, aiding various applications.

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Area of Science:

  • Surface science
  • Fluid dynamics
  • Materials science

Background:

  • Noninvasive manipulation of droplets and bubbles is essential for microfluidics, boiling, condensation, and electrocatalysis.
  • Existing methods for droplet and bubble removal often lack efficiency or require complex setups.

Purpose of the Study:

  • To develop a swift and robust strategy for detaching droplets and bubbles from solid substrates using light.
  • To investigate the underlying physics of light-induced droplet and bubble departure.

Main Methods:

  • Utilizing photoresponsive surfactants and asymmetric illumination to generate a photo-Marangoni lift force.
  • Conducting experiments with toluene droplets and air bubbles on solid substrates.
  • Employing simulations to analyze the forces contributing to departure.

Main Results:

  • Achieved rapid departure of pinned toluene droplets in 0.38 seconds upon illumination.
  • Observed a 20% reduction in air bubble volume at departure, indicating significantly faster removal.
  • Demonstrated effectiveness with moderate light intensities and low surfactant concentrations without specialized substrates.

Conclusions:

  • The photo-Marangoni effect provides an efficient mechanism for droplet and bubble removal.
  • The proposed method is practical for applications requiring surface cleaning and fluid manipulation.
  • This technique shows promise for advanced microfluidic and phase-change systems.