Non-Linear Behavior of Electrothermal Flows

2011 ◽  
Author(s):  
Paul Kauffmann ◽  
Sophie Loire ◽  
Marin Sigurdson ◽  
Igor Mezic´
Keyword(s):  
Electric Field ◽  
Scientific Community ◽  
Particle Image ◽  
Measured Data ◽  
Lab On Chip ◽  
Ac Electric Field ◽  
Linear Behavior ◽  
Electrokinetic Flows ◽  
On Chip ◽  
Buoyancy Flows

Recently, electrokinetic flows have raised the interest of scientific community. Driving flow with an electric field leads to promising applications for mixing, concentration and pumping application in lab on chip. However, current models are still inaccurate and in many cases dont fit the measured data. The work presented here is mainly focused on AC electrothermal flows (ACET) carried out in microwells. An AC electric field is applied between 3 interdigitated gold electrodes. Using μPIV (μ Particle Image Velocity) vortex flows are characterized. The competition between light induced (LEF), AC induced electrothermal (ACET) and buoyancy flows (BF) is discussed. Based on those experimental observations, a new theory is tackled. It takes into account the observed instability like behaviour and the discrepancy of the voltage influence on velocities at high conductivity.

Precision Measurement and Comprehensive Analysis of Dielectrophoretic Crossover Behavior of Micro-Particles

2019 ◽  
Author(s):  
Ying-Chuan Kao ◽  
Yun-Wei Lu ◽  
Chieh Sun ◽  
Chia-Ling Hung ◽  
Jia-Yang Juang
Keyword(s):  
Electric Field ◽  
Comprehensive Analysis ◽  
Field Frequency ◽  
Lab On Chip ◽  
Micro Particles ◽  
Ac Electric Field ◽  
Electric Field Frequency ◽  
Crossover Behavior ◽  
The Difference ◽  
On Chip

Abstract To be one of the hottest topics recent years, a huge amount of diverse applications of the Dielectrophoresis (DEP) phenomenon have been discovered and published. The DEP force mainly comes from the difference in dielectric polarizability between the suspended particles and the suspending medium and it only occurs when the applied AC electric field is non-uniform in space. There are many important parameters that affect the magnitude, direction and the crossover frequency of the DEP force, such as the applied AC electric field frequency, electric field distribution, applied voltage, medium conductivity, particle permittivity, particle size, the electric double layer of particles and so on. Variation of each of the above mentioned parameters could cause great difference in the dielectrophoretic behavior of particles. People have made great efforts in quantifying the influence of them but there are still a lot of uncertain relations and mechanisms to be verified. Therefore, we present a comprehensive analysis of the crossover behavior of micro-particles due to DEP and several concurrent phenomena through both experiments and finite element simulations and provides an important foundation for further insight into electrical properties of micro-particles and for more advanced Lab-on-chip devices developments.

Nanosecond Pulsed Electric Field Lab‐on‐Chip Integrated in Super‐Resolution Microscope for Cytoskeleton Imaging

2019 ◽  
Vol 5 (3) ◽  
pp. 1900669 ◽  
Author(s):  
Daniel Havelka ◽  
Djamel Eddine Chafai ◽  
Ondrej Krivosudský ◽  
Anastasiya Klebanovych ◽  
František Vostárek ◽  
...  
Keyword(s):  
Electric Field ◽  
Super Resolution ◽  
Pulsed Electric Field ◽  
Lab On Chip ◽  
Nanosecond Pulsed Electric Field ◽  
On Chip

AC electric field induced dipole-based on-chip 3D cell rotation

Lab on a Chip ◽  
2014 ◽  
Vol 14 (15) ◽  
pp. 2717-2727 ◽  
Author(s):  
Prateek Benhal ◽  
J. Geoffrey Chase ◽  
Paul Gaynor ◽  
Björn Oback ◽  
Wenhui Wang
Keyword(s):  
Electric Field ◽  
Cost Effective ◽  
Alternating Current ◽  
First Report ◽  
Ac Electric Field ◽  
Cell Rotation ◽  
Induced Dipole ◽  
On Chip ◽  
Current Electric Field

First report on 3D rotation of cells using alternating current electric field on a single, open-top, and cost effective biochip.

scholarly journals A Lab‐On‐chip Tool for Rapid, Quantitative, and Stage‐selective Diagnosis of Malaria

2021 ◽  
pp. 2004101
Author(s):  
Marco Giacometti ◽  
Francesca Milesi ◽  
Pietro Lorenzo Coppadoro ◽  
Alberto Rizzo ◽  
Federico Fagiani ◽  
...  
Keyword(s):  
Lab On Chip ◽  
On Chip

scholarly journals Integrated Magnetohydrodynamic Pump with Magnetic Composite Substrate and Laser-Induced Graphene Electrodes

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1113
Author(s):  
Mohammed Asadullah Khan ◽  
Jürgen Kosel
Keyword(s):  
Magnetic Flux ◽  
Flow Rate ◽  
Magnetic Composite ◽  
Propulsive Force ◽  
Closed Channel ◽  
Lab On Chip ◽  
Composite Substrate ◽  
On Chip ◽  
High Level ◽  
Moving Parts

An integrated polymer-based magnetohydrodynamic (MHD) pump that can actuate saline fluids in closed-channel devices is presented. MHD pumps are attractive for lab-on-chip applications, due to their ability to provide high propulsive force without any moving parts. Unlike other MHD devices, a high level of integration is demonstrated by incorporating both laser-induced graphene (LIG) electrodes as well as a NdFeB magnetic-flux source in the NdFeB-polydimethylsiloxane permanent magnetic composite substrate. The effects of transferring the LIG film from polyimide to the magnetic composite substrate were studied. Operation of the integrated magneto hydrodynamic pump without disruptive bubbles was achieved. In the studied case, the pump produces a flow rate of 28.1 µL/min. while consuming ~1 mW power.

scholarly journals Towards lab-on-chip ultrasensitive ethanol detection using photonic crystal waveguide operating in the mid infrared

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ali Rostamian ◽  
Ehsan Madadi-Kandjani ◽  
Hamed Dalir ◽  
Volker J. Sorger ◽  
Ray T. Chen
Keyword(s):  
Photonic Crystal ◽  
Slow Light ◽  
High Sensitivity ◽  
Guided Wave ◽  
Silicon On Insulator ◽  
Group Index ◽  
Photonic Crystal Waveguide ◽  
Mid Infrared ◽  
Lab On Chip ◽  
On Chip

Abstract Thanks to the unique molecular fingerprints in the mid-infrared spectral region, absorption spectroscopy in this regime has attracted widespread attention in recent years. Contrary to commercially available infrared spectrometers, which are limited by being bulky and cost-intensive, laboratory-on-chip infrared spectrometers can offer sensor advancements including raw sensing performance in addition to use such as enhanced portability. Several platforms have been proposed in the past for on-chip ethanol detection. However, selective sensing with high sensitivity at room temperature has remained a challenge. Here, we experimentally demonstrate an on-chip ethyl alcohol sensor based on a holey photonic crystal waveguide on silicon on insulator-based photonics sensing platform offering an enhanced photoabsorption thus improving sensitivity. This is achieved by designing and engineering an optical slow-light mode with a high group-index of n g  = 73 and a strong localization of modal power in analyte, enabled by the photonic crystal waveguide structure. This approach includes a codesign paradigm that uniquely features an increased effective path length traversed by the guided wave through the to-be-sensed gas analyte. This PIC-based lab-on-chip sensor is exemplary, spectrally designed to operate at the center wavelength of 3.4 μm to match the peak absorbance for ethanol. However, the slow-light enhancement concept is universal offering to cover a wide design-window and spectral ranges towards sensing a plurality of gas species. Using the holey photonic crystal waveguide, we demonstrate the capability of achieving parts per billion levels of gas detection precision. High sensitivity combined with tailorable spectral range along with a compact form-factor enables a new class of portable photonic sensor platforms when combined with integrated with quantum cascade laser and detectors.

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