Microfluidic valves based on TiO2 coating with tunable surface wettability between super hydrophilic and super hydrophobic

T. Zhang, M. Zhang, Tianhong Cui

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

5 Scopus citations

Abstract

A new simple microfluidic valve, which utilizes titanium dioxide (TiO 2) nanoparticles tunable surface wettability between super hydrophilic and super hydrophobic to switch the valve on/off, is presented in this paper. TiO2 nanoparticals are coated using liquid phase deposition (LPD) technique in the selected areas of silicon microchannels. After coating, a fresh TiO2 film is super hydrophilic, and liquid can flow over the TiO2 coated channel easily due to the capillary (valve open). After baking the channel covered with a PDMS film at 200 °C, the contact angle of the TiO2 film increases to 154 degree quickly in 10 minutes, resulting in a stop of liquid flow at the TiO2 film (valve closed). When the TiO2 film is exposed to a UV illumination, the film becomes super hydrophilic, and the valve is open again. The switch duration of the microfluidic valve between on and off status is less than 15 minutes. This type of microfluidic valve provides potential applications to microfluidic systems, especially the lab-on-chip systems.

Original languageEnglish (US)
Title of host publication2011 16th International Solid-State Sensors, Actuators and Microsystems Conference, TRANSDUCERS'11
Pages306-309
Number of pages4
DOIs
StatePublished - Sep 1 2011
Event2011 16th International Solid-State Sensors, Actuators and Microsystems Conference, TRANSDUCERS'11 - Beijing, China
Duration: Jun 5 2011Jun 9 2011

Other

Other2011 16th International Solid-State Sensors, Actuators and Microsystems Conference, TRANSDUCERS'11
CountryChina
CityBeijing
Period6/5/116/9/11

Keywords

  • liquid phase deposition
  • Microfluidic valve
  • super hydrophilic
  • super hydrophobic
  • TiO nanoparticals coating

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