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- Keyword
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- Aggregation; colloids; electrokinetic effects; laser beam applications; microfluidics; suspensions; two-phase flow; vortices (1)
- INDUCED FLUID-FLOW; FREQUENCY DIELECTRIC DISPERSION; ELECTROPHORETIC DEPOSITION; OPTOELECTRONIC TWEEZERS; COLLOIDAL PARTICLES; DYNAMIC MANIPULATION; ELECTROLYTE SOLUTION; SINGLE CELLS; ELECTROHYDRODYNAMIC FLOW; LATEX SPHERES (1)
Articles 1 - 3 of 3
Full-Text Articles in Nanoscience and Nanotechnology
Optically Induced Electrokinetic Patterning And Manipulation Of Particles, Stuart Williams, Aloke Kumar, Steven Wereley
Optically Induced Electrokinetic Patterning And Manipulation Of Particles, Stuart Williams, Aloke Kumar, Steven Wereley
Aloke Kumar
The ability to easily and dynamically control fluid mo- tion as well as manipulate particles in suspension is impor- tant for the development and characterization of a variety of lab-on-a-chip processes. Recently, we have introduced an op- tically induced electrokinetic technique termed rapid electro- kinetic patterning (REP) that can rapidly concentrate, trans- late, and pattern colloids of many different sizes and compositions. We have tested polystyrene, latex, and silica beads in sizes ranging from 49 nm to 3.0 um.1,2
Hybrid Opto-Electric Manipulation In Microfluidics-Opportunities And Challenges, Aloke Kumar, Stuart Williams, Han-Sheng Chuang, Nicolas Green, Steven Wereley
Hybrid Opto-Electric Manipulation In Microfluidics-Opportunities And Challenges, Aloke Kumar, Stuart Williams, Han-Sheng Chuang, Nicolas Green, Steven Wereley
Aloke Kumar
Hybrid opto-electric manipulation in microfluidics/nanofluidics refers to a set of methodologies employing optical modulation of electrokinetic schemes to achieve particle or fluid manipulation at the micro-and nano-scale. Over the last decade, a set of methodologies, which differ in their modulation strategy and/or the length scale of operation, have emerged. These techniques offer new opportunities with their dynamic nature, and their ability for parallel operation has created novel applications and devices. Hybrid opto-electric techniques have been utilized to manipulate objects ranging in diversity from millimetre-sized droplets to nano-particles. This review article discusses the underlying principles, applications and future perspectives of various …
Experiments On Opto-Electrically Generated Microfluidic Vortices, Aloke Kumar, Stuart Williams, Steven Wereley
Experiments On Opto-Electrically Generated Microfluidic Vortices, Aloke Kumar, Stuart Williams, Steven Wereley
Aloke Kumar
Strong microfluidic vortices are generated when a near-infrared (1,064 nm) laser beam is focused within a microchannel and an alternating current (AC) electric field is simultaneously applied. The electric field is generated from a parallel-plate, indium tin oxide (ITO) electrodes separated by 50 lm. We present the first l-PIV analysis of the flow structure of such vortices. The vortices exhibit a sink-type behavior in the plane normal to the electric field and the flow speeds are characterized as a function of the electric field strength and biasing AC signal frequency. At a constant AC frequency of 100 kHz, the fluid …