Patent ID: 7037082
Filing Date: 2006-05-02
Classification: B01D,F04B

Abstract:
1. An electroosmotic flow pump for generating a flow in an ionic solution from an inlet to an outlet in a canal, the electroosmotic flow pump comprising a housing with the canal for holding the ionic solution, a first electrode and a second electrode positioned so as to be in electrical contact with ionic solution held in the canal, means for impressing an electrical potential difference between the first and second electrodes, first at least substantially circular plate of radius r out 1 , a second at least substantially circular plate of radius r out 2 , having a central annular hole of radius r in , the first and the second plate being positioned opposite each other in an at least substantially parallel and concentric configuration at a distance d in the canal so that an electrical path between the first and second electrodes passes the intervening space between the plates and the flow passes the intervening space between the plates and through the hole, wherein all lateral dimensions are much larger than the vertical dimension, r out 1 , r out 2 , r in >>d, wherein facing surface parts of the first and second plates have a zeta potential ζ>10 mV in an 130-160 mM aqueous salt solution with pH value in the interval 7-7.5.