A very low-cost, labor-efficient, and simple method to block scattered ultraviolet light in PDMS microfluidic devices by inserting aluminum foil strips

Shuo Wang, Peter Shankles, Scott Retterer, Yong Tae Kang, Chang Kyoung Choi

Research output: Contribution to journalArticle

Abstract

Opto-microfluidic methods have advantages for manufacturing complex shapes or structures of micro particles/hydrogels. Most of these microfluidic devices are made of polydimethylsiloxane (PDMS) by soft lithography because of its flexibility of designing and manufacturing. However, PDMS scatters ultraviolet (UV) light, which polymerizes the photocrosslinkable materials at undesirable locations and clogs the microfluidic devices. A fluorescent dye has previously been employed to absorb the scattered UV light and shift its wavelength to effectively solve this issue. However, this method is limited due to the cost of the materials (tens of dollars per microchip), the time consumed on synthesizing the fluorescent material and verifying its quality (two to three days). More importantly, significant expertise on material synthesis and characterization is required for users of the optomicrofluidic technique. The cost of preliminary testing on multiple iterations of different microfluidic chip designs would also be excessive. Alternatively, with a delicate microchannel design, we simply inserted aluminum foil strips (AFS) inside the PDMS device to block the scattered UV light. By using this method, the UV light was limited to the exposure region so that the optomicrofluidic device could consistently generate microgels longer than 6 h. This is a nearly cost- and labor-free method to solve this issue.

LanguageEnglish
Article number014501
JournalJournal of Thermal Science and Engineering Applications
Volume11
Issue number1
DOIs
Publication statusPublished - 2019 Feb 1

Fingerprint

Aluminum foil
labor
microfluidic devices
Polydimethylsiloxane
Microfluidics
ultraviolet radiation
foils
strip
Personnel
aluminum
costs
Costs
manufacturing
Hydrogels
microchannels
Microchannels
Fluorescent Dyes
Lithography
Particles (particulate matter)
iteration

Keywords

  • Microgels
  • Opto-microfluidics
  • Polydimethylsiloxane (PDMS)
  • Scattered UV

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Engineering(all)
  • Fluid Flow and Transfer Processes

Cite this

A very low-cost, labor-efficient, and simple method to block scattered ultraviolet light in PDMS microfluidic devices by inserting aluminum foil strips. / Wang, Shuo; Shankles, Peter; Retterer, Scott; Kang, Yong Tae; Choi, Chang Kyoung.

In: Journal of Thermal Science and Engineering Applications, Vol. 11, No. 1, 014501, 01.02.2019.

Research output: Contribution to journalArticle

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