# US 2009/0260990 A1 · Electroosmotic material, method for production of the material, and electroosmotic flow pump

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- Number: US 2009/0260990 A1
- Document ID: US20090260990A1
- Status: Published application
- Kind: A1
- Application number: 12/311,120
- Filed: 2007-09-25
- Published: 2009-10-22
- Earliest claimed: 2006-09-22
- Inventors: Ichiro Yanagisawa; Mitsutaka Fujii; Tomio Ishizuka
- Web page: https://patentgrep.com/patent/US20090260990A1

## CPC

- F04B 17/00: Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- C04B 35/14: based on silica
- C04B 35/18: rich in aluminium oxide
- C04B 35/6262: {of calcined, sintered clinker or ceramics}
- C04B 35/62665: {Flame, plasma or melting treatment}
- C04B 35/62675: {characterised by the treatment temperature}
- C04B 38/00: Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof (treating slag with gases or gas generating material C04B5/06 {; expanded graphite C04B35/536})
- F04B 19/006: {Micropumps (F04B43/043 and F04B43/095 take precedence)}
- G01N 27/447: using electrophoresis
- C04B 2111/90: Electrical properties
- C04B 2235/3201: Alkali metal oxides or oxide-forming salts thereof
- C04B 2235/3208: Calcium oxide or oxide-forming salts thereof, e.g. lime
- C04B 2235/3213: Strontium oxides or oxide-forming salts thereof
- C04B 2235/3215: Barium oxides or oxide-forming salts thereof
- C04B 2235/3217: Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B 2235/3232: Titanium oxides or titanates, e.g. rutile or anatase
- C04B 2235/3236: Alkaline earth titanates
- C04B 2235/3244: Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
- C04B 2235/3248: Zirconates or hafnates, e.g. zircon
- C04B 2235/3418: Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
- C04B 2235/3436: Alkaline earth metal silicates, e.g. barium silicate
- C04B 2235/3472: Alkali metal alumino-silicates other than clay, e.g. spodumene, alkali feldspars such as albite or orthoclase, micas such as muscovite, zeolites such as natrolite
- C04B 2235/349: Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
- C04B 2235/3826: Silicon carbides
- C04B 2235/528: Spheres
- C04B 2235/5436: micrometer sized, i.e. from 1 to 100 micron
- C04B 2235/5445: submicron sized, i.e. from 0,1 to 1 micron
- C04B 2235/656: characterised by specific heating conditions during heat treatment
- C04B 2235/77: Density
- C04B 2235/96: Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

A porous sintered material is produced which is suitable as an electroosmotic material constituting an electroosmotic flow pump. At least one member selected from BaO, SrO, CaO, TiO2, ZrO2, Na2O and K2O or at least one member selected from a natural mineral substance containing aluminum silicate (e.g., alkali feldspar, kaolinite, petalite), BaSiO3, BaTiO3, BaZrO3, BaSiO3 and SiC is added in the total amount of 0.05 to 10 parts by weight to 100 parts by weight of fused quartz or fused silicate (matrix: SiO2). The matrix may be SiO2—Al2O3 which is composed of either one of fused quartz and fused silicate and fused alumina added thereto.

## Claims

### Claim 1

An electroosmotic material comprising a porous sintered body of a dielectric material, wherein
when the dielectric material is brought into contact with a liquid, a surface of the dielectric material is electrically charged,
when a voltage is applied between a first electrode and a second electrode in an electroosmotic flow pump, the electroosmotic material generates an electroosmotic flow in a direction from the first electrode to the second electrode or a reverse direction,
0.05 to 10 parts by weight in total of at least one component selected from the group consisting of BaO, SrO, CaO, TiO2, ZrO2, Na2O, and K2O components is added to 100 parts by weight of a fused quartz or a fused silicic acid, and
the fused quartz or the fused silicic acid has an average particle diameter of 0.2 to 7.5 μm.

### Claim 2

An electroosmotic material comprising a porous sintered body of a dielectric material, wherein
when the dielectric material is brought into contact with a liquid, a surface of the dielectric material is electrically charged,
when a voltage is applied between a first electrode and a second electrode in an electroosmotic flow pump, the electroosmotic material generates an electroosmotic flow in a direction from the first electrode to the second electrode or a reverse direction,
0.05 to 10 parts by weight in total of at least one component selected from the group consisting of natural minerals containing an aluminum silicate salt, BaSiO3, BaTiO3, BaZrO3, SrSiO3, and SiC is added to 100 parts by weight of a fused quartz or a fused silicic acid, and
the fused quartz or the fused silicic acid has an average particle diameter of 0.2 to 7.5 μm.

### Claim 3 (depends on 2)

An electroosmotic material according to claim 2, wherein the natural minerals include alkali feldspars, kaolinites, and petalites.

### Claim 4

An electroosmotic material comprising a porous sintered body of a dielectric material, wherein
when the dielectric material is brought into contact with a liquid, a surface of the dielectric material is electrically charged,
when a voltage is applied between a first electrode and a second electrode in an electroosmotic flow pump, the electroosmotic material generates an electroosmotic flow in a direction from the first electrode to the second electrode or a reverse direction,
0.05 to 10 parts by weight in total of at least one component selected from the group consisting of BaO, SrO, CaO, TiO2, ZrO2, Na2O, and K2O components is added to 100 parts by weight of an SiO2—Al2O3, the mole ratio of a fused quartz or a fused silicic acid: a fused alumina being 65 to 99.8:35 to 0.2 in the SiO2—Al2O3, and
the fused quartz or the fused silicic acid has an average particle diameter of 0.2 to 7.5 μm, and the fused alumina has an average particle diameter of 0.3 to 10 μm.

### Claim 5

An electroosmotic material comprising a porous sintered body of a dielectric material, wherein
when the dielectric material is brought into contact with a liquid, a surface of the dielectric material is electrically charged,
when a voltage is applied between a first electrode and a second electrode in an electroosmotic flow pump, the electroosmotic material generates an electroosmotic flow in a direction from the first electrode to the second electrode or a reverse direction,
0.05 to 10 parts by weight in total of at least one component selected from the group consisting of natural minerals containing an aluminum silicate salt; BaSiO3, BaTiO3, BaZrO3, SrSiO3, and SiC is added to 100 parts by weight of an SiO2—Al2O3, the mole ratio of a fused quartz or a fused silicic acid: a fused alumina being 65 to 99.8:35 to 0.2 in the SiO2—Al2O3, and
the fused quartz or the fused silicic acid has an average particle diameter of 0.2 to 7.5 μm, and the fused alumina has an average particle diameter of 0.3 to 10 μm.

### Claim 6 (depends on 5)

An electroosmotic material according to claim 5, wherein the natural minerals include alkali feldspars, kaolinites, and petalites.

### Claim 7 (depends on 1)

An electroosmotic material according to claim 1, wherein the electroosmotic material has an average porosity of 25% to 52% and an average pore diameter of 0.1 to 8 μm.

### Claim 8

A method for producing an electroosmotic material, comprising the steps of:
adding 0.05 to 10 parts by weight in total of a powder containing at least one component selected from the group consisting of BaO, SrO, CaO, TiO2, ZrO2, Na2O, and K2O components or at least one component selected from the group consisting of natural minerals containing an aluminum silicate salt, BaSiO3, BaTiO3, BaZrO3, SrSiO3, and SiC to 100 parts by weight of a fused quartz powder or a fused silicic acid powder to obtain a mixed powder;
calcining the mixed powder at 800° C. to 1280° C. to obtain a calcine;
milling the calcine to obtain a calcined powder having an average particle diameter of 0.1 to 8.5 μm;
adding a binder to the calcined powder, and forming the resultant mixture to obtain a shape; and
sintering the shape at 1000° C. to 1350° C. to obtain a porous sintered body, wherein
the fused quartz powder or the fused silicic acid powder has an average particle diameter of 0.2 to 7.5 μm.

### Claim 9

A method for producing an electroosmotic material, comprising the steps of:
adding 0.05 to 10 parts by weight in total of a powder containing at least one component selected from the group consisting of BaO, SrO, CaO, TiO2, ZrO2, Na2O, and K2O components or at least one component selected from the group consisting of natural minerals containing an aluminum silicate salt, BaSiO3, BaTiO3, BaZrO3, SrSiO3, and SiC to 100 parts by weight of an SiO2—Al2O3 powder, the mole ratio of a fused quartz or a fused silicic acid: a fused alumina being 65 to 99.8:35 to 0.2 in the SiO2—Al2O3 powder to obtain a mixed powder;
calcining the mixed powder at 800° C. to 1280° C. to obtain a calcine;
milling the calcine to obtain a calcined powder having an average particle diameter of 0.1 to 8.5 μm;
adding a binder to the calcined powder, and forming the resultant mixture to obtain a shape; and
sintering the shape at 1000° C. to 1350° C. to obtain a porous sintered body, wherein
the fused quartz powder or the fused silicic acid powder has an average particle diameter of 0.2 to 7.5 μm, and the fused alumina powder has an average particle diameter of 0.3 to 10 μm.

### Claim 10 (depends on 1)

An electroosmotic flow pump comprising an electroosmotic material according to claim 1.

### Claim 11 (depends on 2)

An electroosmotic flow pump comprising an electroosmotic material according to claim 2.

### Claim 12 (depends on 4)

An electroosmotic flow pump comprising an electroosmotic material according to claim 4.

### Claim 13 (depends on 5)

An electroosmotic flow pump comprising an electroosmotic material according to claim 5.