Teflon-coated silicon microreactors

Impact on segmented liquid-liquid multiphase flows

Simon Kuhn, Ryan Hartman, Mahmooda Sultana, Kevin D. Nagy, Samuel Marre, Klavs F. Jensen

Research output: Contribution to journalArticle

Abstract

We describe fluoropolymer modification of silicon microreactors for control of wetting properties in chemical synthesis applications and characterize the impact of the coating on liquid-liquid multiphase flows of solvents and water. Annular flow of nitrogen gas and a Teflon AF (DuPont) dispersion enable controlled evaporation of fluoropolymer solvent, which in turn brings about three-dimensional polymer deposition on microchannel walls. Consequently, the wetting behavior is switched from hydrophilic to hydrophobic. Analysis of microreactors reveals that the polymer layer thickness increases down the length of the reactor from ̃1 to ̃13 μm with an average thickness of̃7 μm. Similarly, we show that microreactor surfaces can be modified with poly(tetrafluoroethylene) (PTFE). These PTFE-coated microreactors are further characterized by measuring residence time distributions in segmented liquid-liquid multiphase flows, which display reduced axial dispersion for the coated microreactors. Applying particle image velocimetry, changes in segment shape and velocity fluctuations are observed resulting in reduced axial dispersion. Furthermore, the segment size distribution is narrowed for the hydrophobic microreactors, enabling further control of residence distributions for synthesis and screening applications.

Original languageEnglish (US)
Pages (from-to)6519-6527
Number of pages9
JournalLangmuir
Volume27
Issue number10
DOIs
StatePublished - Jun 1 2011

Fingerprint

multiphase flow
Multiphase flow
teflon (trademark)
Polytetrafluoroethylene
Silicon
Polytetrafluoroethylenes
fluoropolymers
Fluorine containing polymers
polytetrafluoroethylene
Liquids
silicon
liquids
wetting
Wetting
Polymers
annular flow
Residence time distribution
polymers
synthesis
particle image velocimetry

ASJC Scopus subject areas

  • Electrochemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Materials Science(all)
  • Spectroscopy

Cite this

Kuhn, S., Hartman, R., Sultana, M., Nagy, K. D., Marre, S., & Jensen, K. F. (2011). Teflon-coated silicon microreactors: Impact on segmented liquid-liquid multiphase flows. Langmuir, 27(10), 6519-6527. https://doi.org/10.1021/la2004744

Teflon-coated silicon microreactors : Impact on segmented liquid-liquid multiphase flows. / Kuhn, Simon; Hartman, Ryan; Sultana, Mahmooda; Nagy, Kevin D.; Marre, Samuel; Jensen, Klavs F.

In: Langmuir, Vol. 27, No. 10, 01.06.2011, p. 6519-6527.

Research output: Contribution to journalArticle

Kuhn, S, Hartman, R, Sultana, M, Nagy, KD, Marre, S & Jensen, KF 2011, 'Teflon-coated silicon microreactors: Impact on segmented liquid-liquid multiphase flows', Langmuir, vol. 27, no. 10, pp. 6519-6527. https://doi.org/10.1021/la2004744
Kuhn, Simon ; Hartman, Ryan ; Sultana, Mahmooda ; Nagy, Kevin D. ; Marre, Samuel ; Jensen, Klavs F. / Teflon-coated silicon microreactors : Impact on segmented liquid-liquid multiphase flows. In: Langmuir. 2011 ; Vol. 27, No. 10. pp. 6519-6527.
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