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Mostrando ítems 1-9 de 9
Artículo
Wall Repulsion during Electrophoresis: Testing the Theory of Concentration-Polarization Electroosmosis
(AIP Publishing, 2023)
We experimentally study the repulsion of charged microscopic particles with the channel walls during electrophoresis in microfluidic devices. For low frequencies of the electric fields (< 10 kHz), this repulsion is mainly ...
Artículo
Wall Repulsion of Charged Colloidal Particles during Electrophoresis in Microfluidic Channels
(American Physical Society, 2022)
Electrophoresis describes the motion of charged particles suspended in electrolytes when subjected to an external electric field. Previous experiments have shown that particles undergoing electrophoresis are repelled from ...
Artículo
Stationary Electro-osmotic Flow Driven by ac Fields around Insulators
(American Physical Society, 2021)
Electric fields are commonly used for manipulating particles and liquids in microfluidic systems. In this work, we report stationary electro-osmotic flow vortices around dielectric micropillars induced by ac electric fields ...
Artículo
Low-frequency electrokinetics in a periodic pillar array for particle separation
(Elsevier, 2023)
Deterministic Lateral Displacement (DLD) exploits periodic arrays of pillars inside microfluidic channels for high-precision sorting of micro- and nano-particles. Previously we demonstrated how DLD separation can be ...
Artículo
Concentration-polarization electroosmosis near insulating constrictions within microfluidic channels
(American Chemical Society, 2021)
Electric fields are commonly used to trap and separate micro- and nanoparticles near channel constrictions in microfluidic devices. The trapping mechanism is attributed to the electrical forces arising from the nonhomogeneous ...
Artículo
Short communication: A simple and accurate method of measuring the zeta-potential of microfluidic channels
(Wiley-Blackwell, 2021)
We describe an improved method for determining the electroosmotic mobility and zeta potential of surfaces based on a current-monitoring method. This technique eliminates the requirement for measurements of channel dimensions ...
Artículo
Particle Finder: a Simple Particle Detection Tool for Continuous-flow Systems
(Springer Nature, 2023)
We describe a user-friendly, open source software for single-particle detection/counting in a continuous-flow. The tool automatically processes video images of particles, including pre-conditioning, followed by size-based ...
Artículo
Insulating Traveling-wave Electrophoresis
(American Physical Society, 2023)
Traveling-wave electrophoresis (TWE) is a method for transporting charged colloidal particles used in many microfluidic techniques for particle manipulation and fractionation. This method exploits the traveling-wave ...
Artículo
Stationary electro-osmotic flow driven by AC fields around charged dielectric spheres
(Cambridge University Press, 2021)
We experimentally demonstrate quadrupolar electro-osmotic flows around charged dielectric microspheres immersed in an electrolyte when subjected to an alternating current electric field. We present an electrokinetic model ...