A5038738691- Microfluidic and Bio-sensing Technologies
- Microfluidic and Capillary Electrophoresis Applications
- Electrostatics and Colloid Interactions
- Electrowetting and Microfluidic Technologies
- Electrohydrodynamics and Fluid Dynamics
- Electrical and Bioimpedance Tomography
- Nanopore and Nanochannel Transport Studies
- Innovative Microfluidic and Catalytic Techniques Innovation
- Magnetic confinement fusion research
- Electrokinetic Soil Remediation Techniques
- Electrochemical Analysis and Applications
- Micro and Nano Robotics
- Photonic and Optical Devices
- Magnetic and Electromagnetic Effects
- Force Microscopy Techniques and Applications
- Ionosphere and magnetosphere dynamics
- Geophysical and Geoelectrical Methods
- Chemical Thermodynamics and Molecular Structure
- Laser-Plasma Interactions and Diagnostics
- Aerosol Filtration and Electrostatic Precipitation
- Plasmonic and Surface Plasmon Research
- Scientific Research and Discoveries
- Acoustic Wave Phenomena Research
- Nuclear Physics and Applications
- Underwater Acoustics Research
Universidad de Sevilla
2015-2025
Instituto de Microelectrónica de Sevilla
2021
Instituto de Física La Plata
2019
University of Twente
2009-2010
University of Southampton
2008
Universidad de Málaga
2002-2005
University of Córdoba
1979
Abstract Purpose This IFSO survey aims to describe the current trends of metabolic and bariatric surgery (MBS) reporting on number types surgical endoluminal procedures performed in 2020 2021, world within each chapter. Methods All national societies belonging were asked complete form. The (surgical interventions) from 2021 documented. A special section focused impact COVID-19, existence protocols for MBS, use telemedicine, any mortality related MBS. trend analysis data, both worldwide...
We present dielectrophoresis (DEP) and electrorotation (ROT) measurements of gold-coated polystyrene microspheres as a function frequency for several electrolyte conductivities. Particle rotation was counterfield with maximum rate observed at single characteristic frequency. Negative DEP frequencies lower than this positive signal higher this. These experimental observations are in agreement predictions the force torque on induced dipole perfectly polarizable metal sphere. theoretical model...
We describe a novel particle separation technique that combines deterministic lateral displacement (DLD) with orthogonal electrokinetic forces to separate particles below the critical diameter.
Mixing within sessile drops can be enhanced by generating internal flow patterns using ac electrowetting. While for low frequencies, the have been attributed to oscillations of drop surface, we provide here driving mechanism hitherto unexplained high-frequency flows. We show that: (1) electric field in liquid bulk becomes important, leading energy dissipation due Joule heating and a temperature increase several degrees Celsius, (2) fluid at these frequencies is generated electrothermal...
Net fluid flow induced by AC potentials applied to arrays of co-planar interdigitated microelectrodes is reported. Two types microelectrode structures have been employed: unequal width electrodes subjected a single signal, and identical traveling-wave potential. A square glass chamber was constructed around the electrode filled with concentration KCl in water conductivity 1 mS/m. map velocity as function voltage (0-8 Vpp) frequency (0.1-100 kHz) presented for array. In both microstructures,...
The new JET ITER-like wall (made of beryllium and tungsten) is more fragile than the former carbon fiber composite requires active protection to prevent excessive heat loads on plasma facing components (PFC). Analog CCD cameras operating in near infrared wavelength are used measure surface temperature PFCs. Region interest (ROI) analysis performed real time maximum measured each ROI sent vessel thermal map. system started October 2011 has already successfully led a safe landing when hot...
The physical mechanisms responsible for the electrical orientation and rotation of metal nanowires suspended in an electrolyte as a function frequency applied ac electric field are examined theoretically experimentally. alignment nanowire with fixed direction is called electro-orientation. induced constant rotating electrorotation. In both situations, interacts charge double layer at metal-electrolyte interface, causing due to torque on dipole, also from induced-charge electro-osmotic flow...
This paper describes the behavior of particles in a deterministic lateral displacement (DLD) separation device with DC and AC electric fields applied orthogonal to fluid flow. As proof principle, we demonstrate tunable microparticle nanoparticle fractionation depending on both particle size zeta potential. DLD is microfluidic technique that performs size-based binary continuous Here, explore how application (separate or together) can be used improve device. We show significantly smaller than...
An array of microelectrodes covered in an electrolyte and energized by a traveling-wave potential produces net movement the fluid. Arrays platinum two different characteristic sizes have been studied. For both arrays, at low voltages (<2 Vpp) flow is qualitative agreement with linear theory ac electroosmosis. At above threshold, direction fluid reversed. The electrical impedance electrode−electrolyte system was measured after experiments, changes properties were observed. Measurements...
Pumping of electrolytes using ac electric fields from arrays microelectrodes is a subject current research. The behavior fluids at low signal amplitudes (<2-3 V(pp)) in qualitative agreement with the prediction electroosmosis theory. At higher voltages, this theory cannot account for experimental observations. In some cases, net pumping generated direction opposite to that predicted by (flow reversal). work, we use fluorescent dyes study effect ionic concentration gradients Faradaic...
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 electrolytes. The characteristics theoretically predicted based on the well-known phenomena of surface conductance concentration polarization a charged object. flows arise from two distinct contributions working together: an oscillating nonuniform zeta potential pillar rectified...
Electrophoresis describes the motion of charged particles suspended in electrolytes when subjected to an external electric field. Previous experiments have shown that undergoing electrophoresis are repelled from nearby channel walls, contrary standard description predicts no hydrodynamic repulsion. Dielectrophoretic (DEP) repulsive forces been commonly invoked as cause this wall We show DEP can only account for repulsion at high frequencies applied In presence a low-frequency field,...
This paper presents an overview of experimental results and progress made in investigating density control using Li-coating, transport L–H transitions TJ-II. The Li-coating changes drastically the plasma–wall interaction, decreasing recycling, enlarges substantially operational range device delaying appearance radiative collapse that happens for higher densities, which permits confinement properties much denser plasmas to be studied. Moreover, mode transition has only been achieved after...
In this work, we extend previous analyses of ac electro-osmosis to account for the combined action two experimentally relevant effects: (i) Faradaic currents from electrochemical reactions at electrodes and (ii) differences in ion mobilities electrolyte. works, electro-osmotic motion has been analyzed theoretically under assumption that only forces diffuse (Debye) layer are relevant. Here, first show if a 1-1 aqueous solution different, charged zone expands Debye include diffusion layer. We...
We describe the physical mechanism responsible for rotation of Brownian metal nanowires suspended in an electrolyte exposed to a rotating electric field. The field interacts with induced charge electrical double layer at metal-electrolyte interface, causing due torque on dipole and induced-charge electro-osmotic flow around particle. Experiments demonstrate that primary driving is former these two. Our analysis contrasts previous work describing manipulation metallic particles fields, which...
We theoretically study the rotation induced on a metal sphere immersed in an electrolyte and subjected to rotating electric field. The arises from interaction of field with charges at metal-electrolyte interface, i.e., electrical double layer (EDL). Particle is due torque dipole, also induced-charge electro-osmostic flow (ICEO). dipole system gives rise counterfield rotation, direction opposite ICEO generates co-field sphere. For thin EDL, negligible rotation. increasing size appears and,...
The so-called "Kelvin water dropper" is a simple experiment demonstrating the spontaneous appearance of induced free charge in droplets emitted through tube. As Lord Kelvin explained, spontaneously acquire net during detachment from faucet due to presence electrical fields their surroundings created by any metallic object. In his experiment, two streams are allowed drip separate nozzles into buckets, which are, at same time, interconnected dripping needles. this paper, we build microfluidic...
We describe the reversible assembly of an aqueous suspension metal nanowires into two different 2-dimensional stable configurations. The is induced by AC electric field magnitude around 10 kV/m. It known that single orientate parallel to for all values applied frequency, according mechanisms depending on frequency. These also govern mutual interaction between nanowires, which leads directed-assembly distinctive structures, shape depends frequency field. show frequencies higher than typical...
Abstract