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EP1534651A1 - Systeme colloidal de nanoparticules ceramiques - Google Patents

Systeme colloidal de nanoparticules ceramiques

Info

Publication number
EP1534651A1
EP1534651A1 EP02807749A EP02807749A EP1534651A1 EP 1534651 A1 EP1534651 A1 EP 1534651A1 EP 02807749 A EP02807749 A EP 02807749A EP 02807749 A EP02807749 A EP 02807749A EP 1534651 A1 EP1534651 A1 EP 1534651A1
Authority
EP
European Patent Office
Prior art keywords
nanoparticles
dispersion medium
colloidal system
ceramic
particle size
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.)
Withdrawn
Application number
EP02807749A
Other languages
German (de)
English (en)
Inventor
Ralph Nonninger
Olaf Binkle
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.)
Itn Nanovation AG
Original Assignee
Itn Nanovation AG
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 Itn Nanovation AG filed Critical Itn Nanovation AG
Publication of EP1534651A1 publication Critical patent/EP1534651A1/fr
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/62605—Treating the starting powders individually or as mixtures
    • C04B35/62625—Wet mixtures
    • C04B35/6263—Wet mixtures characterised by their solids loadings, i.e. the percentage of solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
    • B01D71/02—Inorganic material
    • B01D71/024—Oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
    • B01D71/02—Inorganic material
    • B01D71/05—Cermet materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • C—CHEMISTRY; METALLURGY
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/632—Organic additives
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C04B2235/3215—Barium oxides or oxide-forming salts thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3232—Titanium oxides or titanates, e.g. rutile or anatase
    • C—CHEMISTRY; METALLURGY
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3232—Titanium oxides or titanates, e.g. rutile or anatase
    • C04B2235/3234—Titanates, not containing zirconia
    • C04B2235/3236—Alkaline earth titanates
    • C—CHEMISTRY; METALLURGY
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3272—Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3286—Gallium oxides, gallates, indium oxides, indates, thallium oxides, thallates or oxide forming salts thereof, e.g. zinc gallate
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3293—Tin oxides, stannates or oxide forming salts thereof, e.g. indium tin oxide [ITO]
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
    • C04B2235/449—Organic acids, e.g. EDTA, citrate, acetate, oxalate
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/54—Particle size related information
    • C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
    • C04B2235/5454—Particle size related information expressed by the size of the particles or aggregates thereof nanometer sized, i.e. below 100 nm
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/54—Particle size related information
    • C04B2235/5463—Particle size distributions
    • C04B2235/5472—Bimodal, multi-modal or multi-fraction

Definitions

  • the present invention relates to a colloidal system with inorganic, oxidic nanoparticles in a dispersion medium and its use for the production of ceramic components or for the use in the refinement of existing or new material systems.
  • Ceramic filtration membranes for example, have established themselves in many application areas due to their specific properties compared to membranes made of polymeric, organic materials. They are above all superior in processes in which a high temperature and chemical resistance is required. The possibility of using steam to sterilize them makes them ideal for applications in the food and medical sectors.
  • the flow rate of ceramic membranes is up to 1000 times higher than that of organic membranes and is only slightly influenced by fouling processes due to the inorganic nature of the membrane material.
  • the properties of ceramic membranes often open up new areas of application under the extreme conditions that can be found in many industrial areas. Filtration processes are divided into three areas: micro, ultra and nanofiltration. Microfiltration membranes have pore sizes in a range greater than 500 nm. Ultrafiltration uses membranes with pore sizes of approx.
  • the cut-off value which indicates the molecular weight of neutral molecules that are 90% retained by the membrane, is less than 1000 D for nanofiltration membranes. They are therefore suitable for the enrichment or separation of ions or organic substances can be used for gas separation.
  • the pressures required for nanofiltration are very high due to the small pore sizes and are in a range between 1 and 4 MPa. Because of their higher strength, ceramic membranes have a much higher pressure resistance than polymer membranes, so that there is no compression of the membrane and only much less abrasion due to abrasive components in the filtrate. They therefore offer decisive advantages for use in the field of nanofiltration.
  • colloidal brine is used to manufacture ceramic nanofiltration membranes, which can be obtained using a sol-gel process.
  • the starting materials for the synthesis of the colloids can be either salts or metal alkoxides. Since the structure of the brine can be influenced in a wide range via the hydrolysis and condensation conditions, very good control of the later pore sizes and pore size distributions is possible in this way.
  • Another possibility for the production of the colloidal starting systems for the production of the membrane layer is the controlled precipitation of nanoparticles from their salts.
  • An ultrafiltration membrane very often serves as a carrier layer for the actual nanoporous separation layer and is coated with the colloidal system by means of a casting or immersion process.
  • the fine distribution of the precursor substances and thus the metal ions forming the ceramic layer makes it possible to produce a nanoporous structure.
  • the carrier layer gives the membrane the necessary mechanical strength and pressure stability. By drying and / or calcining the coating, it is converted into a nanoporous, ceramic layer.
  • Dispersions of crystalline nanoparticles have proven to be much more suitable than those made of amorphous compounds for the production of ceramic membranes for the nanofiltration range. If amorphous starting systems are used, stress cracks very often occur during the sintering of the green membrane layer due to the crystallization process, which are particularly noticeable in the fine structure of a nanofiltration membrane. Layers of already crystalline particles do not recrystallize and therefore show a significantly lower tendency to crack. Furthermore, layers of already crystallized particles can usually be solidified at lower temperatures, which in turn minimizes the forces that occur in the interior of the ceramic.
  • the separation performance of a selective membrane layer is essentially determined by the size of its pores and the homogeneity of the pore size distribution. These depend directly on the size of the ceramic particles used to manufacture the membrane, since the porosity of the ceramic is determined by the size of the gaps between the individual grains. The largest pores each determine the cut-off value of a membrane. Defects in the structure in ceramic membranes lead to inhomogeneities in the pore size distribution and thus lead to a deterioration in the separation performance. Such errors can have a variety of causes. They arise, for example, from inclusions, coarser particles in the ceramic dispersions that are used for the Membrane production are used, or by agglomerates of the ceramic nanoparticles that build up the membrane layer.
  • the object of the present invention is to provide an agglomerate-free, ceramic nanoparticle dispersion which enables homogeneous and uniform distributions of the nanoparticles in material systems to be created or supplemented.
  • This object is achieved according to the invention in that 90% or more than 90% of the nanoparticles distributed in the dispersion medium have a matching particle size, the particle size scattering range decreasing from 50%, based on 1 nm nanoparticles, to 10% for 100 nm nanoparticles , and that the atoms and / or ions located in the surface of the nanoparticles are saturated, depending on the concentration of the nanoparticles in the dispersion medium, by means of a surface modifier so far that there is an energetic equilibrium of the nanoparticles in the dispersion medium.
  • the colloidal system according to the invention thus has the particular advantage that not only are nanoparticles essentially dispersed in the dispersion medium to primary particle size, which have the same particle size, but they are also designed such that they form a stable colloidal system in which the nanoparticles have a are distributed homogeneously over a longer period of time.
  • material systems can be created and / or supplemented which are uniform to a very high degree and have no impurities of a kind which the one created or supplemented with the nanoparticles according to the invention Weaken the system or limit it early in a restricted area.
  • the nanoparticles are saturated in the dispersion medium by means of a surface modifier to the extent that they keep each other in suspension in the dispersion medium (energetic equilibrium) and that an increase (agglomeration) of the nanoparticles in the dispersion medium is prevented. In addition, local concentration densifications are prevented.
  • the particle surface of the nanoparticles dispersed according to the invention receives targeted protection which enables the production of many novel colloidal systems which, for example, produce very homogeneous, unimodal / monomodal pore sizes below 2 nm in membrane production for filters. Membrane errors caused by uncontrolled agglomerations or particles that are too coarse are avoided.
  • the decrease in the particle size spread from 50% for nanoparticles from 1 nm to 10% for nanoparticles from 100 nm can be nonlinear or linear.
  • the synthesis of nanoparticles can be carried out using solid, liquid or gaseous systems.
  • the present invention uses a wet chemical method for particle synthesis.
  • various types of surface modifiers are used. These substances accumulate on the surface of the particles through adsorption processes or through a chemical reaction. Depending on the type of surface modifier, this leads to electrostatic, steric or electrosteric stabilization of the nanodisperse systems.
  • the surface energy of the unimodal nanoparticles is generally reduced as much as necessary via one or more surface modifiers in such a way that the nanoparticles are permanently distributed homogeneously distributed over the primary particle size in the dispersion medium.
  • the following surface modifiers are preferably used to stabilize the system of inorganic, oxidic particles according to the invention:
  • Inorganic acids e.g. HO
  • ß-diketone ß-diketone
  • isocyanate organic acids
  • organic acids e.g. C 2 H 4 0 2
  • acid chlorides e.g. C 2 H 4 0 2
  • acid esters e.g. C 2 H 4 0 2
  • silanes e.g. C 2 H 4 0 2
  • polyoxycarboxylic acids e.g. C 2 H 4 0 2
  • the surface modifiers mentioned can each be used alone in the most varied concentrations or together with other surface modifiers in the most varied proportions.
  • nanoscale oxides can then be redispersed in a suitable dispersion medium down to their primary particle size.
  • contents of up to 70% by weight can be achieved without the use of further processes.
  • the stabilization of other nanoparticles or the production of dispersions with a higher content of nanoscale particles can be achieved through use various devices that introduce high shear energy into the systems can be achieved. Although such a shear force is not sufficient to separate already agglomerated particles again, it can avoid agglomeration during workup in the case of particles which are dispersed to the primary particle size.
  • Suitable apparatuses for introducing such shear energy are: in addition to the three-roll mill, kneader, mortar grinder and / or twin-screw extruder.
  • H 2 0, alcohol, tetrahydrofuran and / or halogenated hydrocarbons and / or dilute alkalis and / or dilute acids and / or hydrocarbons and / or aromatic hydrocarbons are used as the dispersion medium.
  • the dispersion medium can also consist of mixtures of the most varied mixing ratios of the dispersion media mentioned.
  • the dispersion media mentioned can keep the unimodal nanoparticles stable and homogeneous in the dispersion medium, so that high-quality further processing to material systems of the highest quality is possible.
  • the inorganic oxide nanoparticles such as titanium dioxide, zirconium dioxide, aluminum oxide, iron oxide, barium titanate or (ITO, tin-doped indium oxide) are obtained, for example, by precipitation and are enriched in a volume distribution of 1-60% in the dispersion medium in a permanently homogeneous distribution.
  • Different volume percentages are particularly advantageous for different processing steps. For example, a higher volume percentage of, for example, 35-55% is required to produce a filter membrane and a volume percentage between 1% and 30% is required for finishing varnishes.
  • the specialist addressed here can determine the volume percentage optimized for his application, for example fillers in one complementary plastic lead to the desired new properties of the finished plastic.
  • Ceramic components, plastics, etc. can be refined with the colloidal system according to the invention, the colloidal system can be used as a filler for thermal insulation or sound insulation, or nanofiltration membranes can be produced.
  • gas sensors or hollow fibers can be produced from the system according to the invention, or existing gas sensors, hollow fibers can be supplemented.
  • a colloidal system of ceramic nanoparticles in a dispersion medium is characterized in that the nanoparticles dispersed in the dispersion medium are distributed with 90% and more proportions in the dispersion medium as unimodal nanoparticles of the same particle size, the particle size scattering range being 50%, based on nanoparticles of 1 nm, decreases to 10% for nanoparticles from 100 nm and the atoms and / or ions located in the surface of the nanoparticles, depending on the concentration of the nanoparticles in the dispersion medium, are saturated so far by means of a surface modifier that an energy balance of the nanoparticles in the Dispersion medium is present.
  • the presented colloidal system is characterized by great stability and keeps the unimodal / - monomodal nanoparticles homogeneously distributed in the dispersion medium in suspension.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Nanotechnology (AREA)
  • Physics & Mathematics (AREA)
  • Composite Materials (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Colloid Chemistry (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)

Abstract

La présente invention concerne un système colloïdal de nanoparticules céramiques dans un milieu de dispersion, qui se caractérise en ce que les nanoparticules dispersées dans le milieu de dispersion sont réparties à 90 % ou plus dans le milieu de dispersion en tant que nanoparticules unimodales de même taille de particule, la répartition des tailles de particule diminuant de 50 %, pour des nanoparticules de 1 nm, à 10 %, pour des nanoparticules de 100 nm, et, en fonction de la concentration des nanoparticules dans le milieu de dispersion, les atomes et/ou ions présents à la surface des nanoparticules étant saturés, du point de vue de la valence, au moyen d'un agent de modification de surface de sorte qu'un équilibre énergétique des nanoparticules règne dans le milieu de dispersion. Le système colloïdal de l'invention se caractérise par une stabilité élevée et permet de maintenir les nanoparticules unimodales/monomodales en suspension dans le milieu de dispersion en étant réparties de façon homogène dans celui-ci.
EP02807749A 2002-09-03 2002-09-03 Systeme colloidal de nanoparticules ceramiques Withdrawn EP1534651A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE2002/003237 WO2004022505A1 (fr) 2002-09-03 2002-09-03 Systeme colloidal de nanoparticules ceramiques

Publications (1)

Publication Number Publication Date
EP1534651A1 true EP1534651A1 (fr) 2005-06-01

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EP02807749A Withdrawn EP1534651A1 (fr) 2002-09-03 2002-09-03 Systeme colloidal de nanoparticules ceramiques

Country Status (6)

Country Link
US (1) US20050250859A1 (fr)
EP (1) EP1534651A1 (fr)
JP (1) JP2005537915A (fr)
AU (1) AU2002333181A1 (fr)
DE (1) DE20280432U1 (fr)
WO (1) WO2004022505A1 (fr)

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WO2004022505A1 (fr) 2004-03-18
US20050250859A1 (en) 2005-11-10
DE20280432U1 (de) 2005-10-13
JP2005537915A (ja) 2005-12-15

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