Prof. Hongrui Jiang
Assistant Professor, Department of Electrical Engineering, University of Wisconsin-Madison
August 27, 2008 | 12:00 to 01:00 | 521 Cory Hall, Hogan Room
Host: Clark Nguyen
Surface tension profoundly affects fluid behavior at the microscale. Through careful engineering, controlled liquid-liquid or liquid-gas interfaces at the microscale can be formed and used in many interesting applications. In this talk, I will present our work on applying such interfaces to microoptics and microsensing. I will first introduce a few types of microlenses and microlens arrays, including "smart" and adaptive liquid microlenses actuated by stimuli-responsive hydrogels, liquid microlenses in situ formed within microfluidic channels via pneumatic control of droplets, and polydimethylsiloxane (PDMS) microlens arrays fabricated through liquid-phase photopolymerization and molding. I will then discuss about a few microsensing techniques including chemical and biological sensing using dissolvable micromembranes in microchannels, chemical and biological sensing at liquid crystals interfacing either air or aqueous solutions, and collection of gaseous samples and aerosols through air-liquid microfluidic interfaces.
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