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Innovations in exploiting photo-controlled Marangoni flows for soft matter actuations.

Chalikkara Farzeena1, Thamarasseril Vijayan Vinay2, Bindhu Sunilkumar Lekshmi3

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Summary

Light-activated surface tension modulation creates microscale Marangoni flows. These optically controlled flows enable precise manipulation of particles, droplets, and liquid marbles in microfluidics and soft matter applications.

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Area of Science:

  • Microfluidics
  • Soft Matter Physics
  • Surface Science

Background:

  • Microscale flow generation is essential for microfluidics.
  • Light offers non-contact, high-resolution control over microflows.
  • Modulating surface tension is a key strategy for generating microflows.

Purpose of the Study:

  • To review innovative light-based methods for modulating surface tension.
  • To explore applications of photo-controlled Marangoni flows in soft matter and microfluidics.
  • To highlight recent advancements in optically controlled flow systems.

Main Methods:

  • Discussing photo-controlled Marangoni flow for particle patterning and assembly.
  • Reviewing methods for actuating droplets and liquid marbles using light-induced surface tension gradients.
  • Examining optically controlled flow-based reconfigurable optics and energy harvesting.

Main Results:

  • Light-induced surface tension gradients effectively drive Marangoni flows.
  • Photo-controlled Marangoni flows enable precise patterning and assembly of colloidal particles.
  • Optically driven actuation of droplets and liquid marbles is demonstrated on various substrates.

Conclusions:

  • Light-based surface tension modulation is a powerful tool in microfluidics.
  • Photo-controlled Marangoni flows offer versatile applications in soft matter manipulation.
  • Emerging trends include reconfigurable optics and energy harvesting using optically controlled flows.