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Ultrasound reforms droplets.

Lokesh Malik1, Subhas Nandy1, Niladri Sekhar Satpathi1

  • 1Micro Nano Bio Fluidics Unit, Department of Mechanical Engineering, Indian Institute of Technology (IIT) Madras, Chennai, Tamil Nadu, India. ashis@iitm.ac.in.

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Summary
This summary is machine-generated.

A novel acousto-microfluidics technique continuously reforms polydisperse emulsions into size-controlled droplets. This method offers precise in situ control and nozzle-less, clog-free generation for improved monodispersity in industrial applications.

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Area of Science:

  • Microfluidics and acoustics
  • Colloid and interface science
  • Materials engineering

Background:

  • Monodisperse droplets are crucial for food, cosmetic, and healthcare industries.
  • Existing methods for emulsion formation are well-established, but continuous in situ reformation of emulsions is lacking.
  • Current droplet generation techniques often face challenges with clogging and require specific liquid stream conditions.

Purpose of the Study:

  • To introduce a continuous flow acousto-microfluidics technique for in situ emulsion reformation.
  • To achieve size-controlled, monodisperse droplet generation from polydisperse emulsions.
  • To enable continuous, nozzle-less, and clog-free droplet production with improved response times.

Main Methods:

  • Utilized a continuous flow acousto-microfluidics platform for simultaneous droplet trapping, coalescence, and splitting.
  • Controlled droplet characteristics in situ by adjusting acoustic power, independent of hydrodynamical parameters.
  • Developed theoretical scaling laws involving capillary (Ca), acousto-capillary (Caa), and acousto-visco-capillary (Caav) numbers to predict droplet size.

Main Results:

  • Successfully reformed polydisperse emulsions into size-controlled droplets with enhanced monodispersity.
  • Demonstrated nozzle-less, clog-free droplet generation from a liquid plug, processing various polydisperse sources.
  • Experimental findings for generated droplet size showed strong agreement with theoretical predictions based on Ca, Caa, and Caav.
  • Characterized acoustic streaming and coalescence for effective mixing within trapped plugs, producing monodisperse mixed-sample droplets.

Conclusions:

  • The acousto-microfluidics technique provides a robust and controllable method for continuous emulsion reformation and monodisperse droplet generation.
  • The identified acousto-visco-capillary number (Caav) effectively governs the generated droplet size.
  • The platform's capability for continuous mixing of inhomogeneous droplets holds significant potential for industrial applications, possibly meeting current throughput standards with design optimization.