Free-surface microfluidics: Exploring new actuation and sensing methods

Gan Yu, Nan Lei, Xiaolin Chen, Wei Xue, Jie Xu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper, we present recent advancements in our group on the development of acoustic actuation and electrochemical sensing technologies that can be used for future free-surface microfluidics. We first show that actuation in free-surface microfluidics can be achieved by acoustic radiation forces. Due to the fact that air and water have very different acoustic impedances, the free surfaces act as perfect sound reflectors. The shape of the free surfaces is important in controlling the acoustic radiation forces. We developed two techniques to precisely control the free-surface shapes: edge pinning and biphilic pinning. We also show mat electrochemical sensing inside a free-surface droplet can be achieved by a simple graphene sensor fabricated with a mask-free process using focused ion beam. The experiment shows that the resistance of the sensor decreases linearly with increasing pH values in the free-surface droplets. The novel actuation and sensing methods developed here can be promising candidates for future free-surface microfluidics.

Original languageEnglish (US)
Title of host publicationNanotechnology 2012
Subtitle of host publicationElectronics, Devices, Fabrication, MEMS, Fluidics and Computational - 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012
Pages365-368
Number of pages4
StatePublished - Aug 17 2012
EventNanotechnology 2012: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational - 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012 - Santa Clara, CA, United States
Duration: Jun 18 2012Jun 21 2012

Publication series

NameTechnical Proceedings of the 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012

Other

OtherNanotechnology 2012: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational - 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012
CountryUnited States
CitySanta Clara, CA
Period6/18/126/21/12

Fingerprint

Microfluidics
Acoustics
Radiation
Acoustic impedance
Graphite
Focused ion beams
Sensors
Graphene
Masks
Acoustic waves
Water
Air

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Surfaces, Coatings and Films

Cite this

Yu, G., Lei, N., Chen, X., Xue, W., & Xu, J. (2012). Free-surface microfluidics: Exploring new actuation and sensing methods. In Nanotechnology 2012: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational - 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012 (pp. 365-368). (Technical Proceedings of the 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012).
Yu, Gan ; Lei, Nan ; Chen, Xiaolin ; Xue, Wei ; Xu, Jie. / Free-surface microfluidics : Exploring new actuation and sensing methods. Nanotechnology 2012: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational - 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012. 2012. pp. 365-368 (Technical Proceedings of the 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012).
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abstract = "In this paper, we present recent advancements in our group on the development of acoustic actuation and electrochemical sensing technologies that can be used for future free-surface microfluidics. We first show that actuation in free-surface microfluidics can be achieved by acoustic radiation forces. Due to the fact that air and water have very different acoustic impedances, the free surfaces act as perfect sound reflectors. The shape of the free surfaces is important in controlling the acoustic radiation forces. We developed two techniques to precisely control the free-surface shapes: edge pinning and biphilic pinning. We also show mat electrochemical sensing inside a free-surface droplet can be achieved by a simple graphene sensor fabricated with a mask-free process using focused ion beam. The experiment shows that the resistance of the sensor decreases linearly with increasing pH values in the free-surface droplets. The novel actuation and sensing methods developed here can be promising candidates for future free-surface microfluidics.",
author = "Gan Yu and Nan Lei and Xiaolin Chen and Wei Xue and Jie Xu",
year = "2012",
month = "8",
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language = "English (US)",
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Yu, G, Lei, N, Chen, X, Xue, W & Xu, J 2012, Free-surface microfluidics: Exploring new actuation and sensing methods. in Nanotechnology 2012: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational - 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012. Technical Proceedings of the 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012, pp. 365-368, Nanotechnology 2012: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational - 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012, Santa Clara, CA, United States, 6/18/12.

Free-surface microfluidics : Exploring new actuation and sensing methods. / Yu, Gan; Lei, Nan; Chen, Xiaolin; Xue, Wei; Xu, Jie.

Nanotechnology 2012: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational - 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012. 2012. p. 365-368 (Technical Proceedings of the 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Yu G, Lei N, Chen X, Xue W, Xu J. Free-surface microfluidics: Exploring new actuation and sensing methods. In Nanotechnology 2012: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational - 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012. 2012. p. 365-368. (Technical Proceedings of the 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012).