Single-layer microfluidic spring diodes via optofluidic lithography for ultra-low reynolds number applications

Ryan D. Sochol, Casey C. Glick, Albert Lu, Melissa Wah, Thomas Brubaker, Kye Y. Lee, Kosuke Iwai, Luke P. Lee, Liwei Lin

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

7 Scopus citations

Abstract

Microfluidic components that are capable of autonomous on-chip operations at ultra-low Reynolds number (e.g., Re 0.2) are critical to the advancement of integrated fluidic circuitry for chemical and biological applications, including point-of-care (POC) molecular diagnostics and on-site chemical detection. Previously, researchers have utilized dynamic resistive elements, such as suspended microbeads and rotational microstructures, to rectify Re 0.2 flow; however, such systems require hydrodynamic forces to return the resistive elements to their closed state positions, allowing undesired reverse flow during this process. Conversely, double-layer flap-type check valves immediately return to their closed state in the absence of forward flow; unfortunately, such valves have exhibited limited functionality for Re 0.3 flow. To overcome these issues, here we introduce single-layer microfluidic spring diodes, which utilize free-standing polymeric microsprings that: (i) compress to promote forward flow, (ii) return to the closed position in the absence of forward flow, and (iii) remain in the closed position to obstruct reverse flow. The free-standing microspring elements were constructed in situ via optofluidic lithography processes. Experimental results revealed an improvement in Di performance with increasing Re for Re 0.1; however, Di's were found to decrease for Re > 0.1. At maximum, we observed an experimental average Di of 4.10±0.01, corresponding to 0.075 Re 0.1 fluid flow.

Original languageEnglish
Title of host publication2013 Transducers and Eurosensors XXVII
Subtitle of host publicationThe 17th International Conference on Solid-State Sensors, Actuators and Microsystems, TRANSDUCERS and EUROSENSORS 2013
Pages2201-2204
Number of pages4
DOIs
StatePublished - 2013
Event2013 17th International Conference on Solid-State Sensors, Actuators and Microsystems, TRANSDUCERS and EUROSENSORS 2013 - Barcelona, Spain
Duration: 16 Jun 201320 Jun 2013

Publication series

Name2013 Transducers and Eurosensors XXVII: The 17th International Conference on Solid-State Sensors, Actuators and Microsystems, TRANSDUCERS and EUROSENSORS 2013

Conference

Conference2013 17th International Conference on Solid-State Sensors, Actuators and Microsystems, TRANSDUCERS and EUROSENSORS 2013
Country/TerritorySpain
CityBarcelona
Period16/06/1320/06/13

Keywords

  • Check Valve
  • Diode Integrated Microfluidic Circuitry
  • Optofluidic Lithography

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