摘要:
An “in-plane” electroosmotic pump may reduce deterioration of performance due to electrolytic gas generation. By controlling the flow of gas generated at the electrodes, while allowing ionic current, the gas may be prevented from fouling the narrow slots which act as pumping channels.
摘要:
Various embodiments of the present invention comprise systems and methods of fabricating porous silicon. One application of such porous silicon is in the fabrication of electro-osmotic pumps and electro-osmotic pump substrates. The method can comprise operations performed on a silicon wafer. A liner material can be deposited on the silicon wafer, and a photoresist layer can be deposited on the liner material. The photoresist layer can be adapted to define a predetermined pattern on the silicon wafer. Then, porous silicon can be formed on the silicon wafer according to the predefined pattern. As a result, solid silicon can support porous silicon regions of the silicon wafer, providing a support structure for the pumping medium. Other embodiments, aspects, and features are also claimed and described.
摘要:
A pumping medium for an electro-osmotic pump made of porous silicon. The porous silicon may result in a lower required pumping voltage and a smaller form factor for an equivalent flow rate and pressure generation as compared to conventional glass frits. The porous silicon may also provide a better thermodynamic efficiency over conventional glass frits for use in electro-osmotic pumps. The increased efficiency of the porous silicon may provide an low-power, high flow rate, high pressure, small form factor, vibration-free pump for cooling microelectronic devices, such as integrated circuit chips.
摘要:
According to some embodiments, a method, system, and apparatus for providing an orientation independent electroosmotic pump. In some embodiments, the method includes an anode and a cathode at different electrical potentials, the anode and cathode are each sealed in an ion-exchange membrane and at least partially immersed in an electrolyte contained in a reservoir of an electroosmotic pump, collecting gases generated by electrolytic decomposition of the electrolyte within a space defined by the ion-exchange membranes that seal the anode and cathode, recombining the collected gases to produce a liquid using a catalyst, the catalyst being located outside of the reservoir, and introducing the produced liquid into the fluid reservoir through an osmotic membrane.
摘要:
Apparatus and methods according to the present invention preferably utilize electroosmotic pumps in fluid handling and field sampling applications. The electroosmotic pumps used in these applications are capable of generating high pressure and flow without moving mechanical parts and the associated generation of unacceptable electrical and acoustic noise, as well as the associated reduction in reliability. Having multiple small flow channels in parallel provides both a high flow rate and high pressure in liquid handling. These electroosmotic pumps are fabricated with materials and structures that improve performance, efficiency, and reduce weight and manufacturing cost relative to presently available micropumps. These electroosmotic pumps also allow for recapture of evolved gases and deposited materials, which may provide for long-term closed-loop operation. Apparatus and methods according to the present invention also allow active regulation of the fluid handling and field sampling devices through electrical control of the flow through the pump. Electroosmotic pumping enables precise dispensing of samples to form genetic, proteomic, or small molecule arrays. A fluid sensor which can be optical, capacitive or other type of electrical sensor is integrated with the electroosmotic pump for measuring liquid levels in liquid drawing and dispensing operations.
摘要:
According to some embodiments, a method, system, and apparatus for providing an orientation independent electroosmotic pump. In some embodiments, the method includes an anode and a cathode at different electrical potentials, the anode and cathode are each sealed in an ion-exchange membrane and at least partially immersed in an electrolyte contained in a reservoir of an electroosmotic pump, collecting gases generated by electrolytic decomposition of the electrolyte within a space defined by the ion-exchange membranes that seal the anode and cathode, recombining the collected gases to produce a liquid using a catalyst, the catalyst being located outside of the reservoir, and introducing the produced liquid into the fluid reservoir through an osmotic membrane.
摘要:
The present invention provides a mechanism for separating or isolating charged particles under the influence of an electric field without metal electrodes being in direct contact with the sample solution. The metal electrodes normally in contact with the sample are replaced with high conductivity fluid electrodes situated parallel and adjacent to the sample. When the fluid electrodes transmit the electric field across the sample, particles within the sample migrate according to their electrophoretic mobility.
摘要:
Water flooding at the cathode of a fuel cell is a common problem in fuel cells. By integrating an electroosmotic (EO) pump to remove product water from the cathode area, fuel cell power can be increased. Integration of EO pumps transforms the designs of air channel and air breathing cathodes, reducing air pumping power loads and increasing oxidant transport. Hydration of gas streams, management of liquid reactants, and oxidant delivery can also be accomplished with integrated electroosmotic pumps. Electroosmotic pumps have no moving parts, can be integrated as a layer of the fuel cell, and scale with centimeter to micron scale fuel cells.
摘要:
An electrokinetic pump for pumping a liquid includes a pumping body having a plurality of narrow, short and straight pore apertures for channeling the liquid through the body. A pair of electrodes for applying a voltage differential are formed on opposing surfaces of the pumping body at opposite ends of the pore apertures. The pumping body is formed on a support structure to maintain a mechanical integrity of the pumping body. The pump can be fabricated using conventional semiconductor processing steps. The pores are preferably formed using plasma etching. The structure is oxidized to insulate the structure and also narrow the pores. A support structure is formed by etching a substrate and removing an interface oxide layer. Electrodes are formed to apply a voltage potential across the pumping body. Another method of fabricating an electrokinetic pump includes providing etch stop alignment marks so that the etch step self-terminates.
摘要:
A method and device for fuel cell heat and water management is provided. A thermally and electrically conductive hydrophilic heat and mass transport element is provided to the fuel cell spanning from inside to outside the cell. The transport element is deposited between current collector and gas diffusion layers, where heat is transported along the transport element from an interior portion of the element inside the cell to an exterior portion of the element outside the cell. Liquid water is transported along the element into or out of the cell, and heat is removed from the exterior portion by any combination of radiation, free convection and forced convection, and where the liquid water is removed from the exterior portion by any combination of convection driven evaporation and advection. The water is added to the cell from the exterior to the interior by any combination of advection and capillary wicking.