Particle AC electrokinetics in planar interdigitated microelectrode geometry

2008 ◽  
Vol 66 (11-12) ◽  
pp. 609-619 ◽  
Author(s):  
Prashant Tathireddy ◽  
Yunn-Hong Choi ◽  
Mikhail Skliar
Keyword(s):  
Ac Electrokinetics ◽  
Interdigitated Microelectrode

AC Electrokinetics for Biosensors

2004 ◽  
Author(s):  
M. Sigurdson ◽  
C. Meinhart ◽  
D. Wang
Keyword(s):  
Electric Fields ◽  
Dna Hybridization ◽  
Fluid Motion ◽  
Diffusive Transport ◽  
Analyte Concentration ◽  
Ac Electrokinetics ◽  
Ac Electric Fields ◽  
Binding Rate ◽  
Electrothermal Flow ◽  
Biosensor Device

We develop here tools for speeding up binding in a biosensor device through augmenting diffusive transport, applicable to immunoassays as well as DNA hybridization, and to a variety of formats, from microfluidic to microarray. AC electric fields generate the fluid motion through the well documented but unexploited phenomenon, Electrothermal Flow, where the circulating flow redirects or stirs the fluid, providing more binding opportunities between suspended and wall-immobilized molecules. Numerical simulations predict a factor of up to 8 increase in binding rate for an immunoassay under reasonable conditions. Preliminary experiments show qualitatively higher binding after 15 minutes. In certain applications, dielectrophoretic capture of passing molecules, when combined with electrothermal flow, can increase local analyte concentration and further enhance binding.

The Humidity Sensitive Behavior of Poly(Ethyleneimine)/Multiwall Carbon Nanotube Composite Films

2012 ◽  
Vol 531-532 ◽  
pp. 588-591
Author(s):  
Tao Zhu ◽  
Guang Zhong Xie ◽  
Ya Dong Jiang ◽  
Jian Liao ◽  
Hui Ling Tai
Keyword(s):  
Carbon Nanotube ◽  
Relative Humidity ◽  
Composite Films ◽  
Multiwall Carbon Nanotube ◽  
Sensing Material ◽  
Nanotube Composites ◽  
Interdigitated Microelectrode ◽  
Carbon Nanotube Composite ◽  
Multiwall Carbon ◽  
Sensitive Behavior

In this paper, a novel humidity sensor based on polymer-carbon nanotube composites was prepared and characterized. Two different methods were adopted to fabricate the humidity-sensing film for these sensors. The surface of the films was observed by a scanning electron microscope (SEM). The sensing material made up of poly(ethyleneimine) and multiwall carbon nanotube was sprayed on the interdigitated microelectrode pairs(IDTs). The resistance between the two electrodes was measured at different relative humidity levels at 19°C. The data shows that the resistance increases with the rise of the relative humidity over the range of 5-90% RH and that, the resistance increases almost linearly in the range of 5-71% RH. The response of the sensors to NO2 and NH3 were also examined, and the results reveal that the sensor is not sensitive to both of them.

DC-biased AC-electrokinetics: a conductivity gradient driven fluid flow

Lab on a Chip ◽  
2011 ◽  
Vol 11 (24) ◽  
pp. 4241 ◽  
Author(s):  
Wee Yang Ng ◽  
Antonio Ramos ◽  
Yee Cheong Lam ◽  
I. Putu Mahendra Wijaya ◽  
Isabel Rodriguez
Keyword(s):  
Fluid Flow ◽  
Ac Electrokinetics ◽  
Conductivity Gradient

An AC electrokinetics-based electrochemical aptasensor for the rapid detection of microRNA-155

2021 ◽  
pp. 113847
Author(s):  
Neil Adrian P. Ondevilla ◽  
Tak-Wah Wong ◽  
Nan-Yao Lee ◽  
Hsien-Chang Chang
Keyword(s):  
Rapid Detection ◽  
Electrochemical Aptasensor ◽  
Ac Electrokinetics

Manipulation of Clinical Materials Using AC Electrokinetics

2010 ◽  
Author(s):  
Mandy L. Y. Sin ◽  
Pak Kin Wong
Keyword(s):  
Experimental Data ◽  
Sample Preparation ◽  
Theoretical Prediction ◽  
Fluid Motion ◽  
Lab On A Chip ◽  
Clinical Samples ◽  
Electrochemical Reactions ◽  
Ac Electrokinetics ◽  
Wide Range ◽  
Electrothermal Flow

AC electrokinetics is a promising approach for sample preparation and reaction enhancement in lab-on-a-chip devices. However, relative little has been done on the electrokinetic manipulation of physiological fluids and buffers with similar properties, such as conductivity. Herein, electrokinetic manipulation of fluids with a wide range of conductivities has been studied as a function of voltage and frequency. AC electrothermal flow is determined to dominate the fluid motion when the applied frequency of the AC potential is above 100 kHz. Interestingly, experimental data deviate from theoretical prediction for fluids with high conductivities (> 1 Sm−1). The deviation can be understood by voltage modulated electrochemical reactions and should be accounted for when manipulating clinical materials with high conductivities. The study will provide useful in sights in designing lab-on-a-chip devices for manipulating clinical samples in the future.

AC Electrokinetics of Colloidal Particles

2012 ◽  
pp. 17-17
Author(s):  
Antonio Aliano ◽  
Giancarlo Cicero ◽  
Hossein Nili ◽  
Nicolas G. Green ◽  
Pablo García-Sánchez ◽  
...  
Keyword(s):  
Colloidal Particles ◽  
Ac Electrokinetics
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