Electroosmotic pump

Electroosmotic pump

An electroosmotic pump (EOP), or EO pump, is used for removing liquid flooding water from channels and gas diffusion layers and direct hydration of the proton exchange membrane in the membrane electrode assembly (MEA) of the proton exchange membrane fuel cells [ [http://microfluidics.asu.edu/fcells.html microfluidics EO pump] ] .

Principle

Electroosmotic pumps are fabricated from silica nanospheres [ [http://ieeexplore.ieee.org/Xplore/login.jsp?url=/iel5/9993/32105/01497386.pdf Silica nanospheres] ] [ [http://microfluidics.stanford.edu/fuel_cells.htm Galvanostatic Measurements] ] or hydrophilic porous glass, the pumping mechanism is generated by an external electric field applied on an electric double layer (EDL), generates high pressures (more than 340 atm (34 MPa) at 12 kV applied potentials) and high flow rates (e.g., 40 ml/min at 100 V in a pumping structure less than 1 cm³ in volume). EO pumps are compact, have no moving parts, and scale favorably with fuel cell design. The EO pump might drop the parasitic load of water management in fuel cells from 20% to 0.5% of the fuel cell power [ [http://www.nsti.org/BioNano2007/showabstract.html?absno=3149 Parasitic load in fuel cells] ] .

Types

Cascade electroosmotic pump

High pressures and flow rates are obtained by positioning several regular electroosmotic pumps parallel to each other in a cascade [ [http://www2.mic.dtu.dk/research/MIFTS/publications/pub2003/cascadeEOFpump.pdf Cascade EO pump] ] .

Porous electroosmotic pump

Porous pumping is created by the use of sintered glass [ [http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WHR-49R5F69-2&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=547973d761ff735a8510786707259e4d Porous glass electroosmotic pumps] ] .

Planar shallow electroosmotic pump

Planar shallow electroosmotic pumps are made of parallel shallow microchannels [ [http://microfluidics.stanford.edu/pubs/chen2002-EOpumpslit.pdf Planar shallow electroosmotic pump] ] .

ee also

*Electroosmotic flow
*Capillary electrophoresis
*Microfluidics
*Micropump
*Sol-gel
*Glossary of fuel cell terms

References

External links

* [http://aiche.confex.com/aiche/2005/techprogram/P15404.HTM Electroosmotic pump and its applications]
* [http://www2.mic.dtu.dk/research/MIFTS/publications/MSc/MScABR.pdf Principles of electroosmotic pumps]


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