K. Araz;"Subwavelength Acoustic Mode Generation..."
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  • K. Araz;"Subwavelength Acoustic Mode Generation..."

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  Subwavelength Acoustic Mode Generation in Microfluidic Systems and Applications in Colloidal Nanoscience and Biotechnology  

Kursad Araz,

Cornell University

Acoustic waves exhibit manipulative effects on the matter through two nonlinear phenomena: acoustic streaming and acoustic radiation pressure force. Despite their century long history, their use in technology was limited due to problems in efficiency and scalability of the force range. Recently, as a promising solution to the problem of micro and nano particle handling in “Lab on a Chip” microfluidic devices, interest in these nonlinear acoustical phenomena is increasing. By using a glass capillary attached to a piezoelectric Lead Zirconate Titanate (PZT) plate, we have demonstrated the generation of extreme subwavelength acoustical modes inside the microfluidic glass capillary even at few volts of voltage drive. These modes generate 2 dimensional acoustic force traps inside the capillary leading to controlled micro/nano particle and biological sample collection, separation and mixing in a single device mechanism without use of any other specific methods such as magnetic beads or electrophoretic interactions. Presented actuator mechanism enables battery operated, inexpensive, portable microfluidic systems which may lead to the production of cost efficient point of care diagnostic devices. Wide range of applications on colloidal micro and nano particles and biological samples such as blood, bacteria and cells will be presented during the talk.   Speaker Biography: Kursad Araz has received his B.S. Degree in Physics from Bogazici University in 2001 and Ph.D. degree in Applied Physics with minor in Electrical Engineering from Cornell University in 2010. He is currently a postdoctoral research associate in School of Electrical and Computer Engineering at Cornell University. During his Ph.D. studies, he focused on the design, microfabrication, theoretical modeling and applications of chipcscale novel acoustical methods for the microfluidic control of micro and nanoparticles, and biological samples. His current and future research interests include ultrasonics, microelectromechanical systems (MEMS) and microfluidics along with their applications in bioengineering, colloidal system characterization and renewable energy harvesting methods. Kursad Araz was the recipient of the IEEE Ultrasonics Conference Best Student Paper Award (2003), IEEE Ultrasonics Conference Student Paper Award (2005), Cornell Engineering Showcase Best Poster Award (2003), TUBITAK Undergraduate Fellowship (1998-1999) and numerous travel awards from DARPA, NIST, IEEE and Transducers Research Foundation (2005-2010). He was the co-founder of Cornell Electron Devices Society and chaired Cornell Engineering Research Conference in 2010.