Autonomous capillary microfluidic devices with constant flow rate and temperature-controlled valving

Lanhui Li, Eiko Ysebrand Westerbeek, Jeroen Christiaan Vollenbroek, Lingling Shui, Mathieu Odijk, Jan C.T. Eijkel

Research output: Contribution to conferencePosterAcademic

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Abstract

We report a capillary microfluidic device with temperature triggered stop valve function. The device consists of a Poly(N-isopropylacrylamide) (PNIPAm) grafted PDMS channel with thermosensitive surface wettability and an integrated platinum heating wire. By locally switching the channel temperature between 20 and 36 °C, a switchable stop valve is obtained. Interestingly, we found that PNIPAm grafted PDMS channel shows a capillary filling rate that is constant in time instead of the well-known Washburn behavior. We explain this by contact-line friction. The device can be applied for real-time flow control with steady velocity field.
Original languageEnglish
Pages380-381
Number of pages2
Publication statusPublished - 2020
Event24th International Conference on Miniaturized Systems for Chemistry and Life Sciences, µTAS 2020 - Virtual Event
Duration: 4 Oct 20209 Oct 2020
Conference number: 24
https://microtas2020.org/

Conference

Conference24th International Conference on Miniaturized Systems for Chemistry and Life Sciences, µTAS 2020
Abbreviated titleMicroTAS 2020
CityVirtual Event
Period4/10/209/10/20
Internet address

Keywords

  • capillary microfluidic
  • responsive wettability
  • stop valve
  • constant flow rate

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