Effect of Analyte Adsorption on the Electroosmotic Flow in Microfluidic Channels

2002 ◽  
Vol 74 (4) ◽  
pp. 771-775 ◽  
Author(s):  
Sandip Ghosal
Keyword(s):  
Electroosmotic Flow ◽  
Microfluidic Channels

Solute Dispersion by Electroosmotic flow in Nonuniform Microfluidic Channels

2001 ◽  
pp. 615-616 ◽  
Author(s):  
M. T. Blom ◽  
E. F. Hasselbrink ◽  
H. Wensink ◽  
A. van den Berg
Keyword(s):  
Electroosmotic Flow ◽  
Microfluidic Channels ◽  
Solute Dispersion

scholarly journals Joule heating and its effects on electroosmotic flow in microfluidic channels

2006 ◽  
Vol 34 ◽  
pp. 925-930 ◽  
Author(s):  
G Y Tang ◽  
D G Yan ◽  
C Yang ◽  
H Q Gong ◽  
C J Chai ◽  
...  
Keyword(s):  
Joule Heating ◽  
Electroosmotic Flow ◽  
Microfluidic Channels

Probing Electric Fields Inside Microfluidic Channels during Electroosmotic Flow with Fast-Scan Cyclic Voltammetry

2004 ◽  
Vol 76 (17) ◽  
pp. 4945-4950 ◽  
Author(s):  
Samuel P. Forry ◽  
Jacqueline R. Murray ◽  
Michael L. A. V. Heien ◽  
Laurie E. Locascio ◽  
R. Mark Wightman
Keyword(s):  
Cyclic Voltammetry ◽  
Electric Fields ◽  
Electroosmotic Flow ◽  
Microfluidic Channels ◽  
Fast Scan Cyclic Voltammetry

scholarly journals Electroosmotic flow of biorheological micropolar fluids through microfluidic channels

2018 ◽  
Vol 30 (2) ◽  
pp. 89-98 ◽  
Author(s):  
Mithilesh Kumar Chaube ◽  
Ashu Yadav ◽  
Dharmendra Tripathi ◽  
O. Anwar Bég
Keyword(s):  
Electroosmotic Flow ◽  
Microfluidic Channels ◽  
Micropolar Fluids

Geometry Effect on the Electrokinetic Instability of the Electroosmotic Flow in Microfluidic Channels

2008 ◽  
Author(s):  
Yee Cheong Lam ◽  
Gongyue Tang ◽  
Deguang Yan
Keyword(s):  
Threshold Voltage ◽  
Electroosmotic Flow ◽  
Fluorescent Imaging ◽  
Microfluidic Channels ◽  
Channel Geometry ◽  
Electrolyte Conductivity ◽  
Electrokinetic Instability ◽  
Micro Channels ◽  
Onset Voltage ◽  
Abrupt Contraction

To study the effect of geometry on electroosmotic flow in micro channels, we fabricated PDMS-glass microchannels of different designs, which have patterned channels with abrupt contraction of different sizes. Using fluorescent imaging technology, we demonstrated the effect of geometry on the instability of DC driven electroosmotic flow in microfluidic channels. For certain geometry and conductivity of the electrolyte solution (Sodium Bicarbonate), there is a threshold voltage for electroosmotic instability, exhibiting itself as “ripple”. Generally, the factors which affect the threshold voltage include channel width, channel geometry, and electrolyte conductivity. Narrower channel resulted in higher onset voltage. As conductivity of the electrolyte increases, the threshold voltage tends to increase. Early transition to unstable electroosmotic flow in microfluidic channels was observed under relatively low Re.

scholarly journals Continuous electroosmotic sorting of particles in grooved microchannels

Soft Matter ◽  
2017 ◽  
Vol 13 (41) ◽  
pp. 7498-7504 ◽  
Author(s):  
Alexander L. Dubov ◽  
Taras Y. Molotilin ◽  
Olga I. Vinogradova
Keyword(s):  
Electroosmotic Flow ◽  
Spherical Particles ◽  
Microfluidic Channels

A novel fractionation concept is proposed for spherical particles in grooved microfluidic channels with an electroosmotic flow.

Electroosmotic Flow in “Click” Surface Modified Microfluidic Channels

2006 ◽  
Author(s):  
Shaurya Prakash ◽  
Timothy M. Long ◽  
Jonathan Wan ◽  
Jeffrey S. Moore ◽  
Mark A. Shannon
Keyword(s):  
Surface Charge ◽  
Photoelectron Spectroscopy ◽  
Electroosmotic Flow ◽  
Separation Efficiency ◽  
High Surface ◽  
High Surface Area ◽  
Attenuated Total Reflection ◽  
Covalent Attachment ◽  
Microfluidic Channels ◽  
Linear Polymers

A rapid, facile, and modular surface modification scheme for the covalent attachment of pre-formed polymer moieties to self-assembled monolayers via ‘click’ chemistry within glass microfluidic channels (3 cm long, 110 μm wide and 15 μm deep) is described. The effect that different moieties have on the electroosmotic flow (EOF) within the microchannels is evaluated. The application of linear polymers such as poly(ethylene glycol) (PEG) generates hydrophilic surfaces that reduce the analyte-wall interactions, thereby increasing separation efficiency and improving resolution, especially in bio-separations. Dendritic polymers such as poly(amido amine) (PAMAM) on channel walls can provide high-surface area structures with tunable surface charge depending on the generation of the dendrimer coating. Modified surfaces are characterized by X-ray photoelectron spectroscopy (XPS), Fourier Transform Infrared-Attenuated Total Reflection spectroscopy (FTIR-ATR), and contact angle measurements. EOF measurements in modified and unmodified channels provide information about wall-analyte interactions. A PAMAM dendrimer coated channel presents an amine terminated surface with a positive charge in contrast to a negatively charged bare-glass surface. Use of surface coatings can lead to an increase of the EOF by 15% as is the case for an azide terminated surface or reverse the direction of EOF as is the case for the PAMAM coatings by changing the surface charge polarity.

Deviation of Electroosmotic Flow From Plug-Like Profile: The Effect of Reservoir Size

2007 ◽  
Author(s):  
Deguang Yan ◽  
Chun Yang ◽  
Xiaoyang Huang
Keyword(s):  
Size Effects ◽  
Electroosmotic Flow ◽  
Flow Characteristics ◽  
Microfluidic Devices ◽  
Time Dependent ◽  
Microfluidic Channels ◽  
Rectangular Microchannel ◽  
Micro Piv ◽  
Piv Technique ◽  
Proposed Model

In electrokinetically-driven microfluidic applications, reservoirs are indispensable and have finite sizes. During operating processes, as the liquid level in reservoirs keeps changing as time elapses, a backpressure is generated. Thus, the flow in microfluidic channels actually exhibits a combination of the electroosmotic flow and the time-dependent induced backpressure-driven flow. In this paper, a model is presented to describe the effect of the finite reservoir size on electroosmotic flow in a rectangular microchannel. Important parameters that describe the effect of finite reservoir size on flow characteristics are discussed. A new concept termed as “effective pumping period” is introduced to characterize the reservoir size effect. The proposed model identifies the mechanisms of the finite-reservoir size effects and is verified by experiment using the micro-PIV technique. The results reported in this study can be used for facilitating the design of microfluidic devices.

Assessment of Joule heating and its effects on electroosmotic flow and electrophoretic transport of solutes in microfluidic channels

2006 ◽  
Vol 27 (3) ◽  
pp. 628-639 ◽  
Author(s):  
Gongyue Tang ◽  
Deguang Yan ◽  
Chun Yang ◽  
Haiqing Gong ◽  
John Chee Chai ◽  
...  
Keyword(s):  
Joule Heating ◽  
Electroosmotic Flow ◽  
Microfluidic Channels ◽  
Electrophoretic Transport

Aging Effects on Oxidized and Amine-Modified Poly(dimethylsiloxane) Surfaces Studied with Chemical Force Titrations:  Effects on Electroosmotic Flow Rate in Microfluidic Channels

Langmuir ◽  
2003 ◽  
Vol 19 (23) ◽  
pp. 9792-9798 ◽  
Author(s):  
Bin Wang ◽  
Lu Chen ◽  
Zamin Abdulali-Kanji ◽  
J. Hugh Horton ◽  
Richard D. Oleschuk
Keyword(s):  
Flow Rate ◽  
Electroosmotic Flow ◽  
Microfluidic Channels ◽  
Aging Effects ◽  
Chemical Force
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