3D-printed glass microfluidics for fluid dynamics and rheology

Noa Burshtein, San To Chan, Kazumi Toda-Peters, Amy Q. Shen, Simon J. Haward

Research output: Contribution to journalReview articlepeer-review

23 Scopus citations

Abstract

Microfluidics provides a versatile platform for handling small volumes of fluids at small length scales. From a fluid dynamics perspective, microfluidics gives access to a regime of very high deformation rates γ˙ at moderate to negligible Reynolds numbers Re. For viscoelastic fluid flows, the resulting high Weissenberg numbers Wi=τγ˙ where τ is the fluid characteristic time, means the flow occurs at high elasticity number El=Wi/Re. Consequently, microfluidics supports a burgeoning interest in the experimental study of purely elastic flow instabilities and elastic turbulence. However, for rheological studies, typical microfluidic fabrications by soft lithography in poly (dimethyl siloxane) suffer from a number of limitations arising from the low elastic modulus and poor optical properties of the material. In this review, we summarise a few recent studies from our group in which we have experimented with microdevice fabrications using the subtractive three-dimensional (3D)-printing technique of selective laser-induced etching (SLE). SLE can be used to fabricate arbitrary 3D geometries with micron precision in fused silica: a high modulus, highly transparent material, which is robust and resistant to organic solvents. Apart from high elasticity number flows, we have found that SLE fabricated devices can sustain very high deformation rates without device failure, providing new access to little-explored inertio-elastic regimes in extremely dilute polymer solutions. Furthermore, it is possible to visualize flows from multiple planes of observation, allowing the quantitative study of 3D flow instabilities and vortex dynamics in both Newtonian and non-Newtonian fluids. SLE fabrication offers many new opportunities to those involved in fluid dynamics and rheology research at the microscale, and we highlight what we perceive as potentially fruitful ideas for future studies using this technique.

Original languageEnglish (US)
Pages (from-to)1-14
Number of pages14
JournalCurrent Opinion in Colloid and Interface Science
Volume43
DOIs
StatePublished - Oct 2019

Keywords

  • Flow instability
  • Microfluidics
  • Molecular orientation
  • Polymer solution
  • Selective laser-induced etching
  • Viscoelasticity
  • Vorticity

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry

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