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Title: High-pressure microhydraulic actuator

Abstract

Electrokinetic ("EK") pumps convert electric to mechanical work when an electric field exerts a body force on ions in the Debye layer of a fluid in a packed bed, which then viscously drags the fluid. Porous silica and polymer monoliths (2.5-mm O.D., and 6-mm to 10-mm length) having a narrow pore size distribution have been developed that are capable of large pressure gradients (250-500 psi/mm) when large electric fields (1000-1500 V/cm) are applied. Flowrates up to 200 .mu.L/min and delivery pressures up to 1200 psi have been demonstrated. Forces up to 5 lb-force at 0.5 mm/s (12 mW) have been demonstrated with a battery-powered DC-DC converter. Hydraulic power of 17 mW (900 psi@ 180 uL/min) has been demonstrated with wall-powered high voltage supplies. The force and stroke delivered by an actuator utilizing an EK pump are shown to exceed the output of solenoids, stepper motors, and DC motors of similar size, despite the low thermodynamic efficiency.

Inventors:
 [1];  [2];  [3]
  1. San Francisco, CA
  2. Fremont, CA
  3. Dublin, CA
Issue Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
983061
Patent Number(s):
7384526
Application Number:
10/848,201
Assignee:
Sandia Corporation (Livermore, CA)
Patent Classifications (CPCs):
F - MECHANICAL ENGINEERING F04 - POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS F04B - POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Mosier, Bruce P, Crocker, Robert W, and Patel, Kamlesh D. High-pressure microhydraulic actuator. United States: N. p., 2008. Web.
Mosier, Bruce P, Crocker, Robert W, & Patel, Kamlesh D. High-pressure microhydraulic actuator. United States.
Mosier, Bruce P, Crocker, Robert W, and Patel, Kamlesh D. Tue . "High-pressure microhydraulic actuator". United States. https://www.osti.gov/servlets/purl/983061.
@article{osti_983061,
title = {High-pressure microhydraulic actuator},
author = {Mosier, Bruce P and Crocker, Robert W and Patel, Kamlesh D},
abstractNote = {Electrokinetic ("EK") pumps convert electric to mechanical work when an electric field exerts a body force on ions in the Debye layer of a fluid in a packed bed, which then viscously drags the fluid. Porous silica and polymer monoliths (2.5-mm O.D., and 6-mm to 10-mm length) having a narrow pore size distribution have been developed that are capable of large pressure gradients (250-500 psi/mm) when large electric fields (1000-1500 V/cm) are applied. Flowrates up to 200 .mu.L/min and delivery pressures up to 1200 psi have been demonstrated. Forces up to 5 lb-force at 0.5 mm/s (12 mW) have been demonstrated with a battery-powered DC-DC converter. Hydraulic power of 17 mW (900 psi@ 180 uL/min) has been demonstrated with wall-powered high voltage supplies. The force and stroke delivered by an actuator utilizing an EK pump are shown to exceed the output of solenoids, stepper motors, and DC motors of similar size, despite the low thermodynamic efficiency.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2008},
month = {6}
}

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Works referenced in this record:

Increasing the performance of high-pressure, high-efficiency electrokinetic micropumps using zwitterionic solute additives
journal, July 2003


High-Pressure Microhydraulic Actuator
conference, May 2008


Conduct-as-Cast Polymer Monoliths as Separation Media for Capillary Electrochromatography
journal, March 2001


Design of the monolithic polymers used in capillary electrochromatography columns
journal, July 2000