Electrokinetic Generation of High Pressures using Porous Microstructures

Paul, Phillip H.; Arnold, Don W.; Rakestraw, David J.

doi:10.1007/978-94-011-5286-0_11

Cited by 73 publications

(62 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, charged porous structures have been employed in some devices to control and improve the fluid behavior as expected. For examples, microparticles which are packed in microchannels have been used to improve the performances of electroosmotic micropumps with a lower flow rate and a higher pumping pressure [19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

“…All these theoretical models are creative and contributive; however there are still two defects so far when they are used for predictions of EOFs in micro-and nanoscale porous media. First, most of the models are based on vanishingly thin electric double layers (EDL) [19][20][21][22][25][26][27][28][29][30][31][32][33][34][35] so that they are not suitable for dense micro-and nanoscale porous media where the small pore space may be in a same order of the EDL thickness. Second, the theoretical models can hardly provide flow structure details, which are necessary for deep understandings of the transport mechanism of electroosmosis in micro-and nanoscale porous media.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Electroosmosis in homogeneously charged micro- and nanoscale random porous media

Wang

Chen

2007

Journal of Colloid and Interface Science

119

View full text Add to dashboard Cite

Electroosmosis in homogeneously charged micro-and nanoscale random porous media has been numerically investigated using mesoscopic simulation methods which involve a random generation-growth method for reproducing three-dimensional random microstructures of porous media and a high-efficiency lattice Poisson-Boltzmann algorithm for solving the strongly nonlinear governing equations of electroosmosis in three-dimensional porous media. The numerical modeling and predictions of EOF in micro-and nanoscale random porous media indicate: the electroosmotic permeability increases monotonically with the porosity of porous media and the increasing rate rises with the porosity as well; the electroosmotic permeability increases with the average solid particle size for a given porosity and with the bulk ionic concentration as well; the proportionally linear relationship between the electroosmotic permeability and the zeta potential on solid surfaces breaks down for high zeta potentials. The present predictions agree well with the available experimental data while some results deviate from the predictions based on the macroscopic theories.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electroosmosis in homogeneously charged micro- and nanoscale random porous media

Wang

Chen

2007

Journal of Colloid and Interface Science

119

View full text Add to dashboard Cite

show abstract

“…Item (3) in this list probably needs to be accomplished first in order get more consistently reliable pump operation as would be required for items (1) and (2). Item (4) would significantly reduce the time required to accomplish items (1) and (2) and therefore would be worth accomplishing before (1) and (2).…”

Section: Conclusion and Further Workmentioning

confidence: 99%

“…Item (4) would significantly reduce the time required to accomplish items (1) and (2) and therefore would be worth accomplishing before (1) and (2). By accomplishing the items in this list we can make a much more informed redesign of these pumps for specific microfludic applications, as well as get a very clear understanding of how these pumps operate in a wide range of conditions.…”

Section: Conclusion and Further Workmentioning

confidence: 99%

“…In this method charged components of a solution are moved by electric fields and pull the rest of the solution along with them. Impressive pressures have been generated by these pumps (10,000 psi [2]), however efficiencies are generally low (<5% [3]), voltage requirements are high (1000 V [2]) and pump operation and performance are dependent on control over the electrical properties of the pumped liquid (dielectric constant, conductivity, pH).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of a new class of surface micromachined pumps.

Galambos¹

2004

View full text Add to dashboard Cite

This is the latest in a series of LDRD's that we have been conducting with Florida State University/Florida A&M University (FSU/FAMU) under the campus executive program. This research builds on the earlier projects; 'Development of Highly Integrated Magnetically and Electrostatically Actuated Micropumps' (SAND2003-4674) and 'Development of Magnetically and Electrostatically Driven Surface Micromachined Pumps' (SAND2002-0704P). In this year's LDRD we designed 2 nd generation of surface micromachined (SMM) gear and viscous pumps. Two SUMMiT TM modules full of design variations of these pumps were fabricated and one SwIFT TM module is still in fabrication. The SwIFT TM fabrication process results in a transparent pump housing cover that will enable visualization inside the pumps. Since the SwIFT TM pumps have not been tested as they are still in fabrication, this report will focus on the 2 nd generation SUMMiT TM designs. Pump testing (pressure vs. flow) was conducted on several of the SUMMiT TM designs resulting in the first pump curve for this class of SMM pumps. A pump curve was generated for the higher torque 2 nd generation gear pump designed by Jason Hendrix of FSU. The pump maximum flow rate at zero head was 6.5 nl/s for a 30V, 30 Hz square wave signal. This level of flow rate would be more than adequate for our typical SMM SUMMiT TM or SwIFT TM channels which have typical volumes on the order of 50 pl.Acknowledgements:

show abstract

Micro Total Analytical Systems in Clinical Chemistry

Hendrikse

Berg

2000

Encyclopedia of Analytical Chemistry

View full text Add to dashboard Cite

A micro total analytical system (μTAS) is a system that enhances the performance of a complete chemical analysis by minimizing the scale on which it is performed. The main advantages are automated analyses, higher speed and better separation performance as well as the ability to analyze extremely small (picoliter) sample volumes and reactions involving minute amounts of reagents. A complete analysis may involve taking a sample, its pretreatment and separation into its different components and their detection. In order to perform this sequence of functions, the sample is transported through microchannels that connect the various system parts performing these tasks, while the various (feedback) signals are transported through a separate microelectronic network. Examples of system parts in silicon, glass and polymers that perform tasks such as hydrodynamic and electroosmotic pumping, laminar and turbulent reagent mixing and (di)electrophoretic separations of DNA fragments and particles and cells are presented. Currently, μTAS are mainly being developed and used for remote environmental and process monitoring, patient monitoring and the analysis of nucleic acids. An integrated system in each of these areas is discussed.

show abstract

Electrokinetic Generation of High Pressures using Porous Microstructures

Cited by 73 publications

References 5 publications

Electroosmosis in homogeneously charged micro- and nanoscale random porous media

Electroosmosis in homogeneously charged micro- and nanoscale random porous media

Characterization of a new class of surface micromachined pumps.

Micro Total Analytical Systems in Clinical Chemistry

Contact Info

Product

Resources

About