Stop flow lithography in perfluoropolyether (PFPE) microfluidic channels

Ki Wan Bong, Jiseok Lee, Patrick S. Doyle

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Stop Flow Lithography (SFL) is a microfluidic-based particle synthesis method for creating anisotropic multifunctional particles with applications that range from MEMS to biomedical engineering. Polydimethylsiloxane (PDMS) has been typically used to construct SFL devices as the material enables rapid prototyping of channels with complex geometries, optical transparency, and oxygen permeability. However, PDMS is not compatible with most organic solvents which limit the current range of materials that can be synthesized with SFL. Here, we demonstrate that a fluorinated elastomer, called perfluoropolyether (PFPE), can be an alternative oxygen permeable elastomer for SFL microfluidic flow channels. We fabricate PFPE microfluidic devices with soft lithography and synthesize anisotropic multifunctional particles in the devices via the SFL process - this is the first demonstration of SFL with oxygen lubrication layers in a non-PDMS channel. We benchmark the SFL performance of the PFPE devices by comparing them to PDMS devices. We synthesized particles in both PFPE and PDMS devices under the same SFL conditions and found the difference of particle dimensions was less than a micron. PFPE devices can greatly expand the range of precursor materials that can be processed in SFL because the fluorinated devices are chemically resistant to most organic solvents, an inaccessible class of reagents in PDMS-based devices due to swelling.

Original languageEnglish
Pages (from-to)4680-4687
Number of pages8
JournalLab on a Chip - Miniaturisation for Chemistry and Biology
Volume14
Issue number24
DOIs
Publication statusPublished - 2014 Dec 21

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Microfluidics
Lithography
Equipment and Supplies
Polydimethylsiloxane
Elastomers
Lab-On-A-Chip Devices
Oxygen
Organic solvents
Micro-Electrical-Mechanical Systems
Biomedical Engineering
Lubrication
Benchmarking
perfluoropolyether
Biomedical engineering
Rapid prototyping
Permeability
Channel flow
Transparency
baysilon
MEMS

ASJC Scopus subject areas

  • Biochemistry
  • Chemistry(all)
  • Bioengineering
  • Biomedical Engineering

Cite this

Stop flow lithography in perfluoropolyether (PFPE) microfluidic channels. / Bong, Ki Wan; Lee, Jiseok; Doyle, Patrick S.

In: Lab on a Chip - Miniaturisation for Chemistry and Biology, Vol. 14, No. 24, 21.12.2014, p. 4680-4687.

Research output: Contribution to journalArticle

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