Size based separation of microparticles using a dielectrophoretic activated system

Khashayar Khoshmanesh, Chen Zhang, Saeid Nahavandi, Francisco J. Tovar-Lopez, Sara Baratchi, Arnan Mitchell, Kourosh Kalantar-zadeh
2010 Journal of Applied Physics  
This work describes the separation of polystyrene microparticles suspended in deionized ͑DI͒ water according to their dimensions using a dielectrophoretic ͑DEP͒ system. The DEP system utilizes curved microelectrodes integrated into a microfluidic system. Microparticles of 1, 6, and 15 m are applied to the system and their response to the DEP field is studied at different frequencies of 100, 200, and 20 MHz. The microelectrodes act as a DEP barrier for 15 m particles and retain them at all
more » ... n them at all frequencies whereas the response of 1 and 6 m particles depend strongly on the applied frequency. At 100 kHz, both particles are trapped by the microelectrodes. However, at 200 kHz, the 1 m particles are trapped by the microelectrodes while the 6 m particles are pushed toward the sidewalls. Finally, at 20 MHz, both particles are pushed toward the sidewalls. The experiments show the tunable performance of the system to sort the microparticles of various dimensions in microfluidic systems. Downloaded 13 Sep 2010 to 128.184.2.1. Redistribution subject to AIP license or copyright; see http://jap.aip.org/about/rights_and_permissions 034904-2 Khoshmanesh et al. J. Appl. Phys. 108, 034904 ͑2010͒ Downloaded 13 Sep 2010 to 128.184.2.1. Redistribution subject to AIP license or copyright; see http://jap.aip.org/about/rights_and_permissions 034904-3 Khoshmanesh et al. J. Appl. Phys. 108, 034904 ͑2010͒ Downloaded 13 Sep 2010 to 128.184.2.1. Redistribution subject to AIP license or copyright; see http://jap.aip.org/about/rights_and_permissions 034904-4 Khoshmanesh et al. J. Appl. Phys. 108, 034904 ͑2010͒ Downloaded 13 Sep 2010 to 128.184.2.1. Redistribution subject to AIP license or copyright; see http://jap.aip.org/about/rights_and_permissions 034904-8 Khoshmanesh et al. This work describes the separation of polystyrene microparticles suspended in deionized ͑DI͒ water according to their dimensions using a dielectrophoretic ͑DEP͒ system. The DEP system utilizes curved microelectrodes integrated into a microfluidic system. Microparticles of 1, 6, and 15 m are applied to the system and their response to the DEP field is studied at different frequencies of 100, 200, and 20 MHz. The microelectrodes act as a DEP barrier for 15 m particles and retain them at all frequencies whereas the response of 1 and 6 m particles depend strongly on the applied frequency. At 100 kHz, both particles are trapped by the microelectrodes. However, at 200 kHz, the 1 m particles are trapped by the microelectrodes while the 6 m particles are pushed toward the sidewalls. Finally, at 20 MHz, both particles are pushed toward the sidewalls. The experiments show the tunable performance of the system to sort the microparticles of various dimensions in microfluidic systems.
doi:10.1063/1.3457226 fatcat:behp62ruunhzxhycqrh2mdbjoe