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Wall fluidization in two acts: from stiff to soft roughness.

Ladislav Derzsi1, Daniele Filippi, Matteo Lulli

  • 1Dipartimento di Fisica e Astronomia "G. Galilei"- DFA, Università di Padova, via Marzolo, 8 - 35131, Padova PD, Italy. ladislav.derzsi@unipd.it derzsi.ladislav@gmail.com matteo.pierno@unipd.it.

Soft Matter
|January 11, 2018
PubMed
Summary
This summary is machine-generated.

Microfluidic channel wall roughness impacts soft glassy material (SGM) fluidization. Two scenarios emerge: droplets escape large gaps, but get trapped in narrow gaps, forming a soft roughness layer that alters flow.

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Area of Science:

  • Rheology and microfluidics
  • Soft matter physics

Background:

  • Fluidization of soft glassy materials (SGMs) is crucial for microfluidic applications.
  • Wall roughness in microfluidic channels significantly influences SGM behavior.

Purpose of the Study:

  • To investigate the impact of microgrooved wall roughness on SGM fluidization in microfluidic channels.
  • To identify and characterize different fluidization scenarios based on groove geometry and SGM properties.

Main Methods:

  • Combined experimental studies and numerical simulations using concentrated emulsions as a model SGM.
  • Analysis of droplet behavior, trapping, and release within microgrooves of varying gap sizes.
  • Characterization of the fluidization dynamics and droplet displacement fields near the walls.

Main Results:

  • Identified two distinct fluidization scenarios: droplet escape from large gaps and droplet trapping in narrow gaps.
  • Demonstrated that narrow gaps create a 'soft roughness' layer of trapped droplets, influencing overlying flow.
  • Showcased that fluidization scales with groove density, with a reduced prefactor for narrow gaps due to material softness.
  • Observed distinct droplet displacement field statistics for each scenario, highlighting the effect of wall stiffness.

Conclusions:

  • Microgroove geometry and SGM properties dictate fluidization behavior in microfluidic channels.
  • The concept of 'soft roughness' provides a new understanding of wall effects in SGM microfluidics.
  • Quantitative insights into SGM-wall interactions can be gained through combined experimental and simulation approaches.