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Search Publications by: Darwin R. Reyes (Fed)

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Displaying 51 - 75 of 108

Polyelectrolyte Multilayers in Microfluidic Systems for Biological Applications

July 31, 2014
Author(s)
Saugandhika S. Minnikanti, Aveek Gangopadhyay, Darwin Reyes-Hernandez
The formation of polyelectrolyte multilayers (PEMs) for the first time two decades ago demonstrating the assembly on charged substrates in a very simple and efficient way have proven to be a reliable method to obtain structures tunable at the nanometer

Dielectrophoretic Trapping of P19 Cells on Indium Tin Oxide based Microelectrode Arrays

November 8, 2013
Author(s)
Aveek Gangopadhyay, Saugandhika Minnikanti, Darwin Reyes-Hernandez, Mulpuri V. Rao, Nathalia Peixoto
A microfabricated device comprised of a microelectrode array (MEA) and a microfluidic channel is presented here for the purpose of trapping cells using positive dielectrophoresis (DEP). Transparent indium tin oxide (ITO) electrodes are patterned in an

Optical Coherence Tomography for Dimensional Metrology of Lab-on-a-chip devices

October 27, 2013
Author(s)
Darwin R. Reyes-Hernandez, Michael W. Halter, Jeeseong Hwang
Here we present a new metrology tool for the determination of the dimensions of channels from final product Lab-on-a-chip devices. Using Optical Coherence Tomography (OCT) areas of up to 12 mm x 12 mm can be imaged in less than 1 second, without the need

Metrology for Lab-on-a-Chip Final-Product Devices

May 12, 2013
Author(s)
Darwin R. Reyes-Hernandez, Michael W. Halter, Jeeseong Hwang
New metrology tools to measure the critical parameters of internal structures in lab on a chip devices are greatly needed in order to develop standard tests for this technology. Here we present a method that combines a custom made optical coherence

Dielectrophoretic Cell Capture on Polyester Membranes

April 2, 2012
Author(s)
Conni Hanke, Petra S. Dittrich, Darwin Reyes-Hernandez
A new system for dielectrophoretic cell capture on porous polyester (PET) membranes is presented. Conventional photolithographic techniques were used to fabricate gold microelectrodes on a PET membrane. We characterized these electrodes to proof that there

Trapping and Release of Citrate-Capped Gold Nanoparticles

August 1, 2011
Author(s)
Darwin R. Reyes-Hernandez, Geraldine I. Mijares, Brian J. Nablo, Kimberly A. Briggman, Michael Gaitan
An electrical method to trap and release charged gold nanoparticles on and from the surface of alkanethiol self-assembled-monolayer (SAM) modified gold electrodes is presented. Gold nanoparticle (GNP) coated electrodes were formed by immersing amine