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Droplet drinking in constrictions.

Shi Feng1, Chundong Xue2, Cunliang Pan3

  • 1School of Chemistry, State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Dalian Key Laboratory of Intelligent Chemistry, Dalian University of Technology, Dalian 116024, China. taosy@dlut.edu.cn.

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Summary
This summary is machine-generated.

Researchers observed "droplet drinking," a pinocytosis-like phenomenon in microfluidic droplets. This process allows artificial cells to engulf fluids, enabling complex emulsion formation and reactant integration for biochemical reactions.

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Area of Science:

  • Biophysics
  • Microfluidics
  • Cellular Engineering

Background:

  • Microfluidic droplets are key for artificial cell assembly.
  • Mimicking natural cell shape changes like phagocytosis is a major challenge.
  • Simulating cellular deformation in artificial cells requires novel approaches.

Purpose of the Study:

  • To report a novel pinocytosis-like phenomenon in microfluidic droplets, termed "droplet drinking."
  • To investigate the mechanisms and influencing factors of this droplet deformation behavior.
  • To demonstrate the utility of this phenomenon for creating complex emulsions and integrating reactants.

Main Methods:

  • Observing droplet behavior within microfluidic capillaries with constrictions.
  • Analyzing the influence of shear force and continuous-phase fluid dynamics.
  • Investigating the role of capillary number and interfacial tension on droplet engulfment.
  • Modifying capillary constrictions to control emulsion complexity.

Main Results:

  • A pinocytosis-like phenomenon ("droplet drinking") was observed, where droplets engulf continuous-phase fluid at constrictions.
  • This process leads to the formation of multiple emulsions (multicore/multi-shell).
  • Droplet size is controlled by interfacial tension, and the phenomenon is influenced by the capillary number.

Conclusions:

  • "Droplet drinking" offers a new method for generating complex emulsions.
  • This phenomenon provides an innovative strategy for studying artificial cell deformation.
  • The method facilitates reactant integration into droplets for biochemical applications.