US20160252082A1 - Electroosmotic pump - Google Patents

Electroosmotic pump Download PDF

Info

Publication number
US20160252082A1
US20160252082A1 US14/390,543 US201314390543A US2016252082A1 US 20160252082 A1 US20160252082 A1 US 20160252082A1 US 201314390543 A US201314390543 A US 201314390543A US 2016252082 A1 US2016252082 A1 US 2016252082A1
Authority
US
United States
Prior art keywords
porous dielectric
water
dielectric membrane
permeable electrode
membrane
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US14/390,543
Other languages
English (en)
Inventor
Yasushi Okumura
Hirotsugu Kikuchi
Hiroki HIGUCHI
Manabu Taniguchi
Kazuki Yamamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyushu University NUC
Sekisui Chemical Co Ltd
Original Assignee
Kyushu University NUC
Sekisui Chemical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kyushu University NUC, Sekisui Chemical Co Ltd filed Critical Kyushu University NUC
Assigned to KYUSHU UNIVERSITY, NATIONAL UNIVERSITY CORPORATION, SEKISUI CHEMICAL CO., LTD. reassignment KYUSHU UNIVERSITY, NATIONAL UNIVERSITY CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YAMAMOTO, KAZUKI, HIGUCHI, Hiroki, KIKUCHI, HIROTSUGU, OKUMURA, YASUSHI, TANIGUCHI, MANABU
Publication of US20160252082A1 publication Critical patent/US20160252082A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B19/00—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00
    • F04B19/006—Micropumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B19/00—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00
    • F04B19/04—Pumps for special use

Definitions

  • the present invention relates to electroosmotic pumps.
  • micropumps which are a type of microfluidic device.
  • the applications of micropumps are various, such as microreactors, hand-held medical devices, and fuel delivery for fuel cells.
  • a mechanical micropump is conventionally known as a micropump.
  • the mechanical micropump is composed of precision components. Therefore, the mechanical micropump is limited in cost reduction and size reduction.
  • Electroosmotic flow is liquid flow occurring when a voltage is applied to an electrical double layer where liquid and solid are in contact with each other. Electroosmotic flow has been found, together with electrophoresis, by the physicist Reuss in the early 19th century. In contrast to electrophoresis in which a solute or charged particles in liquid move, solid in the case of electroosmotic flow is immobilized. Therefore, when electroosmotic flow occurs, bulk liquid moves. Electroosmotic flow is observed in liquids composed of polarized molecules, including protic solvents, such as water and alcohol, ionic liquids, and so on.
  • the electroosmotic pump is a pump configured to deliver a liquid using the electroosmotic flow.
  • Patent Literature 1 JP-A-2010-216902
  • Patent Literature 1 describes an example of the electroosmotic pump.
  • a conventional electroosmotic pump such as the electroosmotic pump described in Patent Literature 1
  • a principal object of the present invention is to provide a novel electroosmotic pump capable of being driven by AC voltage.
  • a first electroosmotic pump according to the present invention includes a porous dielectric membrane, a first water-permeable electrode, and a second water-permeable electrode.
  • the first water-permeable electrode is disposed on one side of the porous dielectric membrane.
  • the second water-permeable electrode is disposed on the other side of the porous dielectric membrane.
  • a principal surface of the porous dielectric membrane close to the first water-permeable electrode and a principal surface of the porous dielectric membrane close to the second water-permeable electrode have mutually different hydrophilicities.
  • each of the first water-permeable electrode and the second water-permeable electrode is preferably a porous conductive film deposited on the surface of the porous dielectric membrane, a conductive mesh, a sintered film of conductive particles or a patterned electrode printed on a porous insulating film.
  • the porous dielectric membrane may include a hydrophilic layer on one of the principal surfaces.
  • a second electroosmotic pump includes a porous dielectric membrane, a first water-permeable electrode, and a second water-permeable electrode.
  • the first water-permeable electrode is disposed on one side of the porous dielectric membrane.
  • the second water-permeable electrode is disposed on the other side of the porous dielectric membrane.
  • One surface of the porous dielectric membrane and the other surface of the porous dielectric membrane have mutually different zeta potentials or mutually different streaming potentials.
  • a third electroosmotic pump includes a porous dielectric membrane, a first water-permeable electrode, and a second water-permeable electrode.
  • the first water-permeable electrode is disposed on one side of the porous dielectric membrane.
  • the second water-permeable electrode is disposed on the other side of the porous dielectric membrane.
  • the porous dielectric membrane is configured so that when an AC voltage is applied between the first water-permeable electrode and the second water-permeable electrode, a liquid in the porous dielectric membrane is given a force to selectively move from one of the side close to the first water-permeable electrode and the side close to the second water-permeable electrode to the other side.
  • the porous dielectric membrane may include a first porous dielectric membrane and a second porous dielectric membrane which are stacked on each other, one of the principal surfaces of the porous dielectric membrane may be formed by the first porous dielectric membrane, and the other principal surface of the porous dielectric membrane may be formed by the second porous dielectric membrane.
  • Each of the first to third electroosmotic pumps according to the present invention may further include a power source operable to apply an AC voltage between the first water-permeable electrode and the second water-permeable electrode.
  • the power source is preferably configured to apply an AC voltage with a frequency of 1 MHz or less.
  • the porous dielectric membrane preferably has a thickness in a range of 5 ⁇ m to 100 ⁇ m.
  • a ratio of the area of the first and second water-permeable electrodes to the square of thickness of the porous dielectric membrane ((the area of the first and second water-permeable electrodes)/(the thickness of the porous dielectric membrane) 2 ) is preferably more than 100.
  • the porous dielectric membrane preferably has an average pore diameter in a range of 10 nm to 50 ⁇ m.
  • each of the first and second water-permeable electrodes preferably has a through hole passing through the water-permeable electrode in a thickness direction thereof.
  • the porous dielectric membrane preferably has a through hole passing through the porous dielectric membrane in a thickness direction thereof.
  • the first water-permeable electrode when the principal surface of the porous dielectric membrane close to the first water-permeable electrode has a higher hydrophilicity than the principal surface of the porous dielectric membrane close to the second water-permeable electrode, the first water-permeable electrode preferably includes a hydrophilic layer as a surface layer on the side opposite to the porous dielectric membrane.
  • the present invention can provide a novel electroosmotic pump capable of being driven by AC voltage.
  • FIG. 1 is a schematic cross-sectional view of a liquid delivery module including an electroosmotic pump according to a first embodiment.
  • FIG. 2 is a schematic cross-sectional view of a portion of a liquid delivery membrane in the first embodiment.
  • FIG. 3 is a schematic cross-sectional view of a portion of a liquid delivery membrane in a second embodiment.
  • FIG. 4 is a schematic diagram of a hydrophilic layer of the liquid delivery membrane in the second embodiment.
  • FIG. 5 is a schematic cross-sectional view of a portion of a liquid delivery membrane in a third embodiment.
  • FIG. 6 is a photograph of a fracture cross-section of a track etched membrane used in Example 1.
  • FIG. 7 is a graph showing the relationship between applied voltage and flow rate in Example 1.
  • FIG. 8 is a graph showing the relationship between applied voltage and flow rate in Examples 1 to 3.
  • FIG. 1 is a schematic cross-sectional view of an electroosmotic pump according to this embodiment.
  • FIG. 2 is a schematic cross-sectional view of a portion of a liquid delivery membrane in this embodiment.
  • a liquid delivery module 1 shown in FIG. 1 includes holding jigs 10 , 11 and an electroosmotic pump 2 mounted to the holding jigs 10 , 11 .
  • the electroosmotic pump 2 includes a liquid delivery membrane 20 sandwiched between a first water-permeable electrode and a second water-permeable electrode. AC power is supplied to the electroosmotic pump 2 .
  • the liquid delivery membrane 20 separates a first reservoir 12 and a second reservoir 13 .
  • the second reservoir 13 is connected to a liquid tank 30 . Liquid is supplied from this liquid tank 30 to the first reservoir 12 .
  • the liquid supplied to the first reservoir 12 is delivered to the second reservoir 13 by the liquid delivery membrane 20 and then discharged through an outlet 14 provided in the second reservoir 13 .
  • first reservoir 12 and the second reservoir 13 be those for guiding a liquid to one side and the other side of the electroosmotic pump 2 and providing a path along which the liquid is transported.
  • the first and second reservoirs 12 , 13 do not necessarily have a particular volume.
  • the first reservoir 12 and the second reservoir 13 may be part of any flow channel of a microfluidic device.
  • each of the first reservoir 12 and the second reservoir 13 may be filled with a water-permeable porous material or gel.
  • the liquid delivery membrane 20 may have a flat shape, a sagging structure, a structure with a plurality of asperities or a folded structure. In these cases, the ratio of the actual area of the surface of the liquid delivery membrane 20 to the area thereof in plan view ((the actual area of the surface of the liquid delivery membrane 20 )/(the area of the liquid delivery membrane 20 in plan view)) can be increased. Therefore, the liquid delivery capacity of the electroosmotic pump 2 can be increased.
  • the liquid delivery membrane 20 includes a porous dielectric membrane 21 .
  • the porous dielectric membrane 21 is made of an appropriate dielectric material.
  • the porous dielectric membrane 21 may be formed of, for example, a polymer membrane made of polycarbonate (PC), polyester (PET), polyimide (PI) or so on or an inorganic membrane made of ceramic, silicon, glass, sintered aluminum oxide, sintered aluminum nitride, sintered mullite, sintered silicon carbide, sintered silicon nitride, sintered glass-ceramic material or so on.
  • the porous dielectric membrane 21 may be, for example, a porous monolithic material.
  • the porous dielectric membrane 21 is preferably a track etched membrane.
  • the track etched membrane used herein means a membrane subjected to track etching.
  • the track etching refers to chemical etching in which a membrane is irradiated with strong heavy ions to form linear tracks in the membrane.
  • porous dielectric membrane 21 is a polymer membrane or an inorganic membrane, pores can be formed therein by irradiation of laser light.
  • the porous dielectric membrane 21 is preferably a membrane with open cells and preferably a membrane with a plurality of through holes passing through the membrane in its thickness direction. Normally, the track etched membrane has a large number of through holes passing through the membrane in its thickness direction.
  • the thickness of the porous dielectric membrane 21 is preferably about 5 ⁇ m to about 100 ⁇ m and more preferably 10 ⁇ m to 60 ⁇ m.
  • the thickness of the porous dielectric membrane 21 can be balanced with the thickness of an electrical double layer to be formed. Therefore, the electroosmotic pump 2 can be suitably operated.
  • the average pore diameter of the porous dielectric membrane 21 is preferably 10 nm to 50 ⁇ m, more preferably 20 nm to 10 ⁇ m, and still more preferably 50 nm to 2 ⁇ m. If the average pore diameter of the porous dielectric membrane 21 is too small, the flow resistance may be large to make the amount of liquid delivered small. If the average pore diameter of the porous dielectric membrane 21 is too large, the hydraulic pressure of the delivered liquid may be reduced to deteriorate the energy efficiency of electroosmotic flow.
  • the porosity of the porous dielectric membrane 21 is preferably 1% to 50% and more preferably 3% to 30%. If the porosity of the porous dielectric membrane 21 is too high, adjacent pores are likely to merge with each other, which may present a problem with self-sustainability as a membrane. If the porosity of the porous dielectric membrane 21 is too low, the amount of liquid delivered may be small.
  • the pore density of the porous dielectric membrane 21 is preferably 4E2/cm 2 to 5E13/cm 2 and more preferably 3E4/cm 2 to 7.5E10/cm 2 . If the pore density of the porous dielectric membrane 21 is too high, the porosity may be too high or the average pore diameter may be too small. If the pore density of the porous dielectric membrane 21 is too low, the energy efficiency of electroosmotic flow may be deteriorated.
  • a first water-permeable electrode 22 is provided on the side of the porous dielectric membrane 21 close to the second reservoir 13 .
  • a second water-permeable electrode 23 is provided on the side of the porous dielectric membrane 21 close to the first reservoir 12 . It is sufficient that each of the first and second water-permeable electrodes 22 , 23 be provided so that when a liquid is supplied, an electrical double layer is formed on the associated surface of the porous dielectric membrane 21 .
  • Each of the first and second water-permeable electrodes 22 , 23 does not necessarily have to be in contact with the porous dielectric membrane 21 .
  • conductive rubber with a high modulus of elasticity may be interposed between each of the first and second water-permeable electrodes 22 , 23 and the porous dielectric membrane 21 .
  • the first and second water-permeable electrodes 22 , 23 are provided to allow liquid to permeate them in their thickness direction.
  • Each of the first and second water-permeable electrodes 22 , 23 preferably has through holes passing through it in its thickness direction. These through holes in the first and second water-permeable electrodes 22 , 23 are preferably connected to the through holes in the porous dielectric membrane 21 .
  • Each of the first and second water-permeable electrodes 22 , 23 can be formed, for example, by depositing a conductive material, such as metal, on the porous dielectric membrane 21 so that the pores in the porous dielectric membrane 21 are not fully closed.
  • a conductive material such as metal
  • each of the first and second water-permeable electrodes 22 , 23 may be formed of, for example, a patterned electrode, such as a mesh electrode, a comb-shaped electrode, a staggered electrode or fractal patterned electrode.
  • the first and second water-permeable electrodes 22 , 23 are preferably made of a good conductive material.
  • each of the first and second water-permeable electrodes 22 , 23 may be made of at least one metal of the group consisting of gold, silver, and copper, a composite material consisting predominantly of carbon, such as carbon nanotubes, a transparent conductive oxide, such as indium tin oxide (ITO), or so on.
  • ITO indium tin oxide
  • the electroosmotic pump 2 includes an AC power source 40 .
  • This AC power source 40 applies an AC voltage between the first and second water-permeable electrodes 22 , 23 .
  • the AC power source 40 preferably applies an AC voltage with a frequency of 1 MHz or less between the first and second water-permeable electrodes 22 , 23 , more preferably an AC voltage of 0.5 Hz to 20 kHz, and still more preferably an AC voltage of 1 Hz to 100 Hz. If the frequency of the AC voltage applied between the first and second water-permeable electrodes 22 , 23 is too high, the electroosmotic pump 2 may not be suitably operated.
  • the porous dielectric membrane 21 includes a hydrophilic layer 21 a on a principal surface thereof close to the first water-permeable electrode 22 .
  • the porous dielectric membrane 21 is a track etched membrane
  • one of both surface layers of the porous dielectric membrane 21 is the hydrophilic layer 21 a .
  • the hydrophilic layer 21 a can be formed by subjecting one of both surfaces of the porous dielectric membrane 21 to hydrophilic treatment as typified by plasma treatment, such as atmospheric plasma chemical treatment, or chemical modification with molecules having hydrophilic functional groups.
  • polymer containing a hydrophilic functional group that is preferably used is polyurethane urea containing a phosphorylcholine group.
  • examples of a polymer containing a hydrophilic functional group that can be used include polylysine and polyallylamine which have a large number of amino groups in their molecular chains.
  • the method for chemically modifying the surface of the porous dielectric membrane 21 with molecules having hydrophilic functional groups is not limited to the above and any chemically modifying hydrophilic treatment technique that can be known by those skilled in the art is applicable.
  • the hydrophilicity of the surface of the hydrophilic layer 21 a is higher than that of a principal surface of the porous dielectric membrane 21 close to the second water-permeable electrode 23 . Therefore, the principal surface of the porous dielectric membrane 21 close to the first water-permeable electrode 22 and the principal surface thereof close to the second water-permeable electrode 23 have mutually different zeta potentials or mutually different streaming potentials.
  • the zeta potential of the principal surface of the porous dielectric membrane 21 close to the first water-permeable electrode 22 is greater than that of the principal surface thereof close to the second water-permeable electrode 23 or the streaming potential of the principal surface of the porous dielectric membrane 21 close to the first water-permeable electrode 22 is greater than that of the principal surface thereof close to the second water-permeable electrode 23 . Therefore, when an AC voltage is applied between the first water-permeable electrode 22 and the second water-permeable electrode 23 , the liquid is transferred from the first reservoir 12 to the second reservoir 13 . Thus, the electroosmotic pump 2 operates.
  • the porous dielectric membrane 21 is configured so that when an AC voltage is applied between the first water-permeable electrode 22 and the second water-permeable electrode 23 , the liquid in the porous dielectric membrane 21 is given a force to move from the side close to the first water-permeable electrode 22 to the side close to the second water-permeable electrode 23 . Therefore, the electroosmotic pump 2 can be driven by an AC voltage. Hence, unlike the case where a DC voltage is applied to the electroosmotic pump, it is less likely that during drive of the electroosmotic pump 2 the liquid may be electrolyzed to change the pH of the liquid or change air bubbles.
  • the ratio of the area of the first and second water-permeable electrodes 22 , 23 to the square of thickness of the porous dielectric membrane 21 ((the area of the first and second water-permeable electrodes 22 , 23 )/(the thickness of the porous dielectric membrane 21 ) 2 ) is preferably more than 100. If the ratio ((the area of the first and second water-permeable electrodes 22 , 23 )/(the thickness of the porous dielectric membrane 21 ) 2 ) is too small, the efficiency of liquid delivery becomes poor. There is no upper limit on this ratio.
  • the hydrophilicity can be measured with an automatic contact angle meter (DM-300, Kyowa Interface Science Co., Ltd.).
  • Zeta potential The interface of solid or liquid in contact with a protic solvent, as typified by an aqueous solution, is electrically charged except for special cases.
  • the electric field derived from the electric charges attracts ions of opposite sign (counter ions) from the solution side to form an ionic atmosphere (electrical double layer) near the surface.
  • the electrical double layer includes: a Stern layer where counter ions are thus substantially immobile; and a diffuse electrical double layer having a structure in which counter ions are sparser with distance from the solid surface and are movably diffused.
  • the zeta potential is a potential at a “slipping plane” (also referred to as a shear plane) located at the boundary between the Stern layer and the diffuse electrical double layer.
  • the zeta potential at the membrane surface can be measured with, for example, a membrane zeta potential measurement system (ELSZ-1, Otsuka Electronics Co., Ltd.).
  • the zeta potential in pores can be measured with, for example, a solid zeta potential measurement system (SurPASS, Anton Paar Japan K. K.).
  • the streaming potential can be measured with the solid zeta potential measurement system (SurPASS, Anton Paar Japan K. K.).
  • the electroosmotic pump of the present invention is operable by the application of an AC voltage thereto but does not necessarily have to be inoperable upon application of a DC voltage thereto. Normally, the electroosmotic pump of the present invention is operable not only upon application of an AC voltage but also upon application of a DC voltage.
  • FIG. 3 is a schematic cross-sectional view of a portion of a liquid delivery membrane in a second embodiment.
  • the electroosmotic pump according to this embodiment is different from the electroosmotic pump 2 according to the first embodiment in that the first water-permeable electrode 22 includes a hydrophilic layer 22 a as a surface layer on the side opposite to the porous dielectric membrane 21 .
  • the liquid delivery capacity can be increased.
  • the hydrophilic layer 22 a can be formed by subjecting the first water-permeable electrode 22 to surface treatment with a self-assembly reagent or the like capable of providing a gold-thiol bond.
  • a self-assembly reagent capable of providing a gold-thiol bond.
  • An example of the self-assembly reagent that can be preferably used is molecules with a main chain containing one end constituted by a sulfur atom and the other end constituted by a hydrophilic group. Specific examples of such a self-assembly reagent include:
  • FIG. 4 shows a schematic diagram of a hydrophilic layer 22 a formed using such a self-assembly reagent as described above (specifically, 1,1-mercaptoundecanoic acid).
  • degreasing treatment Prior to the hydrophilic treatment with a self-assembly reagent, degreasing treatment, supercritical CO 2 cleaning, plasma treatment, corona discharge treatment or the like may be additionally performed.
  • FIG. 5 is a schematic cross-sectional view of a portion of a liquid delivery membrane in a third embodiment.
  • the porous dielectric membrane 21 includes a first porous dielectric membrane 21 A and a second porous dielectric membrane 21 B.
  • the first porous dielectric membrane 21 A and the second porous dielectric membrane 21 B are stacked.
  • the first porous dielectric membrane 21 A is located toward the first water-permeable electrode 22 and the second porous dielectric membrane 21 B is located toward the second water-permeable electrode 23 .
  • the first porous dielectric membrane 21 A is made of a material having a higher hydrophilicity than the second porous dielectric membrane 21 B.
  • the surface of the porous dielectric membrane 21 close to the first water-permeable electrode 22 has a higher hydrophilicity than the surface thereof close to the second water-permeable electrode 23 .
  • the electroosmotic pump of this embodiment is also operable by the application of an AC voltage thereto.
  • the ratio between the thickness of the first porous dielectric membrane 21 A and the thickness of the second porous dielectric membrane 21 B is preferably 1:100 to 100:1 and more preferably 1:10 to 10:1.
  • An electroosmotic pump having substantially the same structure as the electroosmotic pump 2 according to the first embodiment was produced in the following manner.
  • a 20-nm-thick gold film was deposited on both surfaces of a track etched membrane with a thickness of 20 ⁇ m and an average pore diameter of 400 nm (Isopore membrane filter HTTP04700, Millipore) using a magnetron sputtering system (MSP-1S, Vacuum Device Inc.) to form a liquid delivery membrane.
  • MSP-1S magnetron sputtering system
  • the first and second water-permeable electrodes made of gold were connected through respective conductive rubber electrodes to an AC power source.
  • the distance between the first water-permeable electrode and the second water-permeable electrode was 20 ⁇ m equal to the thickness of the track etched membrane.
  • FIG. 6 is a photograph of a fracture cross-section of the track etched membrane used in Example 1.
  • the zeta potential at the surface of the track etched membrane was measured using a membrane zeta potential measurement system (ELSZ-1, Otsuka Electronics Co., Ltd.). Specifically, the velocity of an electroosmotic flow induced by applying an electric field to and in parallel with the track etched membrane was observed as the velocity of motion of polystyrene latex (500 nm) made uncharged by modification with hydroxypropyl cellulose and the zeta potential was determined from the velocity of motion. A 10 mM NaCl aqueous solution was used as the liquid. The results are shown in Table 1 below.
  • the zeta potential in pores of the track etched membrane was measured by the streaming potential method using a solid zeta potential measurement system (SurPASS, Anton Paar Japan K. K.). As the results of calculation of zeta potentials from streaming potentials caused by application of a hydraulic pressure,
  • the zeta potential calculated from the streaming potential from the first water-permeable electrode toward the second water-permeable electrode was ⁇ 36.01 mV
  • the zeta potential calculated from the streaming potential from the second water-permeable electrode toward the first water-permeable electrode was ⁇ 40.11 mV.
  • the zeta potentials in pores were much lower than the zeta potentials at the membrane surfaces.
  • results shown in FIG. 7 reveal that the electroosmotic pump produced in this example is driven upon application of an AC voltage.
  • the results also reveal that the flow rate can be increased by increasing the voltage applied.
  • An electroosmotic pump was produced in the same manner as in Example 1 except that the surface of the first water-permeable electrode on the side opposite to the porous dielectric membrane was treated with 1,1-mercaptoundecanoic acid to form a hydrophilic layer.
  • An electroosmotic pump was produced in the same manner as in Example 1 except that the surface of the first water-permeable electrode close to the porous dielectric membrane was treated with 1,1-mercaptoundecanoic acid to form a hydrophilic layer.
  • the results shown in FIG. 8 reveal that the liquid delivery capacity can be increased by forming a hydrophilic layer on the surface of the first water-permeable electrode on the side opposite to the porous dielectric membrane.
  • a liquid containing a pH indicator dissolved in deionized water was supplied to the apparatus produced in Example 1 and a 9.34-Vrms AC voltage was applied between the first and second water-permeable electrodes with 25 Hz for 15 minutes. Thereafter, the color tones of the first and second reservoirs were observed. The color tones of the first and second reservoirs were similar to those prior to the application of the voltage, their pH values were unchanged, and no gas due to electrolysis was generated. Also when a 0.9% by mass NaCl aqueous solution was used as a solvent, the first and second reservoirs exhibited no change in pH and no gas due to electrolysis was generated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US14/390,543 2013-10-22 2013-10-22 Electroosmotic pump Abandoned US20160252082A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2013/078574 WO2015059766A1 (ja) 2013-10-22 2013-10-22 電気浸透流ポンプ

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2013/078574 A-371-Of-International WO2015059766A1 (ja) 2013-10-22 2013-10-22 電気浸透流ポンプ

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US15/655,100 Division US20170335836A1 (en) 2013-10-22 2017-07-20 Electroosmotic pump

Publications (1)

Publication Number Publication Date
US20160252082A1 true US20160252082A1 (en) 2016-09-01

Family

ID=52992405

Family Applications (2)

Application Number Title Priority Date Filing Date
US14/390,543 Abandoned US20160252082A1 (en) 2013-10-22 2013-10-22 Electroosmotic pump
US15/655,100 Abandoned US20170335836A1 (en) 2013-10-22 2017-07-20 Electroosmotic pump

Family Applications After (1)

Application Number Title Priority Date Filing Date
US15/655,100 Abandoned US20170335836A1 (en) 2013-10-22 2017-07-20 Electroosmotic pump

Country Status (3)

Country Link
US (2) US20160252082A1 (ja)
JP (1) JP6166268B2 (ja)
WO (1) WO2015059766A1 (ja)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190255486A1 (en) * 2016-09-08 2019-08-22 Osmotex Ag Layered electroosmotic structure
US11015583B2 (en) * 2016-06-28 2021-05-25 Eoflow Co., Ltd. Electroosmotic pump and fluid-pumping system comprising the same
US11033675B2 (en) * 2017-04-21 2021-06-15 atDose Co., Ltd. Portable compact infusion device
US11598323B2 (en) * 2017-09-12 2023-03-07 Osmotex Ag Method for pumping an aqueous fluid through an electroosmotic membrane
US11703040B2 (en) 2018-10-03 2023-07-18 Murata Manufacturing Co., Ltd. Pump and cooling substrate

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210046474A1 (en) * 2018-03-21 2021-02-18 Lintec Of America, Inc. Carbon nanotube yarn electroosmotic pump
KR20210116751A (ko) * 2020-03-13 2021-09-28 이오플로우(주) 전기 삼투 펌프, 이의 제조방법 및 이를 포함하는 유체 펌핑 시스템
KR20210116750A (ko) * 2020-03-13 2021-09-28 이오플로우(주) 전기 삼투 펌프용 막-전극 어셈블리, 이를 포함하는 전기 삼투 펌프 및 유체 펌핑 시스템
JP6744527B1 (ja) * 2020-04-01 2020-08-19 アットドウス株式会社 薬液投与ユニット、薬液投与モジュール、薬液投与装置、及び投薬管理システム

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7086839B2 (en) * 2002-09-23 2006-08-08 Cooligy, Inc. Micro-fabricated electrokinetic pump with on-frit electrode
US20110311372A1 (en) * 2010-06-17 2011-12-22 Henry Hess Pump Devices, Methods, and Systems

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4555597B2 (ja) * 2004-03-19 2010-10-06 積水化学工業株式会社 マイクロタス用水素ポンプ
JP5104434B2 (ja) * 2008-03-17 2012-12-19 カシオ計算機株式会社 流体機器
JP2010216902A (ja) * 2009-03-16 2010-09-30 Kyocera Corp 電気浸透流ポンプ、およびマイクロ化学チップ
JP2012189498A (ja) * 2011-03-11 2012-10-04 Sharp Corp 電界発生装置および電界発生方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7086839B2 (en) * 2002-09-23 2006-08-08 Cooligy, Inc. Micro-fabricated electrokinetic pump with on-frit electrode
US20110311372A1 (en) * 2010-06-17 2011-12-22 Henry Hess Pump Devices, Methods, and Systems

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11015583B2 (en) * 2016-06-28 2021-05-25 Eoflow Co., Ltd. Electroosmotic pump and fluid-pumping system comprising the same
US20210239102A1 (en) * 2016-06-28 2021-08-05 Eoflow Co., Ltd. Electroosmotic pump and fluid-pumping system comprising the same
US11603831B2 (en) * 2016-06-28 2023-03-14 Eoflow Co., Ltd. Electroosmotic pump and fluid-pumping system comprising the same
US11859602B2 (en) * 2016-06-28 2024-01-02 Eoflow Co., Ltd. Electroosmotic pump and fluid-pumping system comprising the same
US20190255486A1 (en) * 2016-09-08 2019-08-22 Osmotex Ag Layered electroosmotic structure
US10695721B2 (en) * 2016-09-08 2020-06-30 Osmotex Ag Layered electroosmotic structure
US11033675B2 (en) * 2017-04-21 2021-06-15 atDose Co., Ltd. Portable compact infusion device
US11598323B2 (en) * 2017-09-12 2023-03-07 Osmotex Ag Method for pumping an aqueous fluid through an electroosmotic membrane
US11703040B2 (en) 2018-10-03 2023-07-18 Murata Manufacturing Co., Ltd. Pump and cooling substrate

Also Published As

Publication number Publication date
JP6166268B2 (ja) 2017-07-19
WO2015059766A1 (ja) 2015-04-30
JPWO2015059766A1 (ja) 2017-03-09
US20170335836A1 (en) 2017-11-23

Similar Documents

Publication Publication Date Title
US20170335836A1 (en) Electroosmotic pump
US20180201525A1 (en) Membraneless seawater desalination
WO2006106885A1 (ja) 液体輸送装置及び液体輸送システム
US10220354B2 (en) Electroosmotic membrane
JP6166269B2 (ja) 電気浸透流ポンプ、その製造方法及びマイクロ流体デバイス
US8652314B2 (en) Flow de-ionization using independently controlled voltages
US9103331B2 (en) Electro-osmotic pump
US9725340B2 (en) Method of building massively-parallel ion concentration polarization separation device
US9956529B2 (en) Microfabricated ion-selective filter for filtration of ions and molecules
JP2023040102A (ja) 導電性ダイヤモンド電極を有する電気化学セル
KR102129681B1 (ko) 연속공정식 액적 전기천공 장치 및 이를 이용한 연속공정식 액적 전기천공 방법
Wu et al. Fluidics for energy harvesting: from nano to milli scales
US8920621B2 (en) Pump
US20220332609A1 (en) Flow-through electrode capacitive deionization cell
Sheybani et al. Rapid and repeated bolus drug delivery enabled by high efficiency electrochemical bellows actuators
US9695067B2 (en) Conductive micro-channel structure
US9701549B2 (en) Three-dimensional micro-channel structure
US10058821B2 (en) Ion pump
CN207918499U (zh) 一种用于电渗析海水淡化的膜组件
KR101833047B1 (ko) 축전식 탈염 장치
US9695069B2 (en) Micro-channel electrode structure
US20150259226A1 (en) Desalination apparatus
Sekine et al. Electrochemical agarose stamp for addressable micropatterning

Legal Events

Date Code Title Description
AS Assignment

Owner name: SEKISUI CHEMICAL CO., LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OKUMURA, YASUSHI;KIKUCHI, HIROTSUGU;HIGUCHI, HIROKI;AND OTHERS;SIGNING DATES FROM 20140910 TO 20140930;REEL/FRAME:034087/0226

Owner name: KYUSHU UNIVERSITY, NATIONAL UNIVERSITY CORPORATION

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OKUMURA, YASUSHI;KIKUCHI, HIROTSUGU;HIGUCHI, HIROKI;AND OTHERS;SIGNING DATES FROM 20140910 TO 20140930;REEL/FRAME:034087/0226

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION