915 results about "Electrophoretic deposition" patented technology

One close loop system and method for electrophoretic deposition (EPD) of phosphor material on light emitting diodes (LEDs). The system comprises a deposition chamber sealed from ambient air. A mixture of phosphor material and solution is provided to the chamber with the mixture also being sealed from ambient air. A carrier holds a batch of LEDs in the chamber with the mixture contacting the areas of the LEDs for phosphor deposition. A voltage supply applies a voltage to the LEDs and the mixture to cause the phosphor material to deposit on the LEDs at the mixture contacting areas.

Solid free form fabrication techniques can be utilized indirectly to manufacture substrates, dies, models, near-net shapes, shells, and wax-ups that are then used in the manufacture of dental articles. Digital light processing is the most preferred indirect method for the production of substrates. After the substrates are produced, various coating or deposition techniques such as gel casting, slip casting, slurry casting, pressure infiltration, dipping, colloidal spray deposition or electrophoretic deposition are used to manufacture the dental article.

Disclosed are methods for preparing electrophoretically deposited graphene based films.

A method of depositing diamond particles on a surface of a substrate is provided. The method is effected by (a) charging the diamond particles by a positive charge to obtain positively charged diamond particles; and (b) electrophoretically depositing the positively charged diamond particles on the surface of the substrate, for obtaining a green diamond particles coat on the surface of the substrate.

Provided are methods for forming graphene or functionalized graphene thin films. Also provided are graphene and functionalized graphene thin films formed by the methods. For example, electrophoretic deposition methods and stamping methods are used. Defect-free thin films can be formed. Patterned films can be formed. The methods can provide conformal coatings on non-planar substrates.

A method for electrophoretic deposition of ceramic particles as a green body shaped as a dental appliance, the method comprising the steps of (a) forming a suspension of the ceramic particles in a first polar solvent, the ceramic particles constituting at least about 5% of the first suspension by weight; (b) passing a direct electrical current through the first suspension, using a deposition electrode shaped as the dental appliance to form a green body; (c) coating the green body with glass particles; and (d) sintering the resultant coated body for obtaining a glass coated all-ceramic dental appliance.

A device having an improved thermal barrier coating (46) and a process for manufacturing the same. A support structure (28) for retaining a ceramic insulating material (46) on a substrate (16) is formed by the deposition of a support structure material through a patterned masking material (14). The support structure can define cells into which the ceramic insulating material is deposited following removal of the masking material. The masking material may be patterned by known photolithographic techniques (22,24) or by laser etching (48). The support structure (28) may be a composite metal-ceramic material having either discreet layers (30,34) or a graded composition and may be deposited by an electro-desposition process followed by a heat treatment to form a solid state diffusion bond with the substrate. The ceramic filler material may be deposited (44) by the electrophoretic deposition of ceramic particles coated with a bonding material that is subsequently heated to oxidize and to bond the particles together. The support structure may be provided with included walls in order to improve its resistance to foreign object impact damage.

Methods and devices arising from the practice thereof for making and using battery electrodes formed onto ion permeable, electrically non-conductive substrates, preferably battery separators are disclosed herein. Electrodes are formed onto substrates using a variety of methods including, but not limited to, spray coating and electrophoretic deposition. Electrically conductive layers may be applied to the electrode coating layer side opposite or adjacent to the substrate to act as current collectors for the battery. Multilayer devices having alternating layers of conductive layers, electrode layers and substrates, wherein the conductive layers may be in electrical communication with other conductive layers to form a battery.

This invention relates to novel calcium phosphate-coated implantable medical devices and processes of making same. The calcium-phosphate coatings are designed to minimize the immune response to the implant (e.g. restenosis in stenting procedures) and can be used to store and release a medicinally active agent in a controlled manner. Such coatings can be applied to any implantable medical devices and are useful for a number of medical procedures including (but not limited to) balloon angioplasty in cardiovascular stenting, ureteral stenting and catheterisation. The calcium phosphate coatings can be applied to a substrate as one or more coatings by a sol-gel deposition process, an aerosol-gel deposition process, a biomimetic deposition process, a calcium phosphate cement deposition process, an electro-phoretic deposition process or an electrochemical deposition process. The coating can contain and elude a drug in an engineered manner.

A number of unique processes are disclosed for manufacture of sintered high-purity quartz glass products in which a shaped silica body or preform is made from an aqueous slurry of micronized silica particles by gel casting, slip casting or electrophoretic deposition. The silica particles may comprise a major portion by weight of crystalline silica. In one embodiment of the invention the sintered quartz glass is transparent, substantially bubble-free and suitable for scientific or optical uses. In another embodiment the porous silica preform is fired in steam to increase the hydroxyl content and then nitrided in a nitrogen-hydrogen reducing atmosphere. A minute amount of chemically-combined nitrogen in the high-purity quartz glass is sufficient to provide a tremendous improvement in physical properties and an incredible increase in the resistance to devitrification.

Compositions containing strontium fortified calcium nanoparticles and/or microparticles, and methods of making and using thereof are described herein. The strontium fortified calcium compounds contain calcium ions, calcium atoms, strontium ions, strontium atoms, and combinations thereof and one or more anions. Exemplary anions include, but are not limited to, citrate, phosphate, carbonate, and combinations thereof. The particles can be formulated for enteral or parenteral administration by incorporating the particles into a pharmaceutically carrier. The compositions can further contain one or more active agents useful for bone diseases or disorders, such as vitamin D, growth factors, and combinations thereof. The compositions can be used to treat or prevent one or more bone diseases or disorders of the bone, such as osteoporosis. Alternatively, the particles can be coated onto a substrate, such as the surface of an implant. The coatings can be used to improved biocompatibility of the implant, prevent loosening of the implant, reducing leaching of metal ions from metallic implants, and reduce corrosion. The coatings can be applied to the substrate using a variety of techniques well known in the art. In one embodiment, the coating is applied using electrophoretic deposition. The use of nano- and/or microparticles that provide high surface area helps to improve interfacial strength between the coating and the implant, which allows for the use of lower sintering temperatures. Lowering sintering temperatures minimizes or prevents thermal decomposition of the coating material and/or degradation of the implant material.

A method of fabricating a field emission device cathode using electrophoretic deposition of carbon nanotubes in which a separate step of depositing a binder material onto a substrate, is performed prior to carbon nanotube particle deposition. First, a binder layer is deposited on a substrate from a solution containing a binder material. The substrate having the binder material deposited thereon is then transferred into a carbon nanotube suspension bath allowing for coating of the carbon nanotube particles onto the substrate. Thermal processing of the coating transforms the binder layer properties which provides for the adhesion of the carbon nanotube particles to the binder material.

A method of forming on an object a surface coating having a high mechanical strength and chemical and physical stability above 700° C. is disclosed. The method comprises (a) electrophoretically depositing at least one surface coating material on a surface of the object for obtaining a green coating on the surface; and (b) infiltrating into and depositing onto the green coating at least one additional surface coating material by a gas-phase infiltration/deposition method, thereby forming a high performance surface coating, wherein, the at least one surface coating material and the at least one additional surface coating material are chemically and physically stable above 700° C.

The invention discloses a foam metal-graphene composite material and a preparation method thereof. The composite material comprises a foam metal substrate and a graphene film layer positioned on the substrate. The foam metal-graphene composite material is prepared by means of electrophoresis. Specifically, the preparation method comprises the following steps: removing greasy dirt and oxides from the surface of a foam metal substrate, preparing graphene by the oxidation-reduction method, modifying graphene, and performing electrophoretic deposition on the graphene on the surface of the foam metal substrate. Within a certain of electromagnetic waveband, on one hand, the foam metal-graphene composite material has the structural advantages of light weight and porosity, large specific surface area and good conductivity of a foam metal, and on the other hand, the composite material integrates excellent electrical conductivity and high dielectric constant, a capacity of being more conducive to absorbing electromagnetic waves due to a large amount of defects and functional group residues of the self-made graphene, and other properties of self-made graphene. The composite material has a higher electromagnetic shielding performance and can serve as an excellent electromagnetic shielding material.

A method of manufacturing light emitting diode packaging lens and packages made by using the method are disclosed in the present invention. By using electrophoretic deposition, one or more layers of phosphors are coated onto one surface of a cup which has a curved portion. The cup is used for the packaging lens. Thickness of phosphor layer can be controlled and distribution of phosphor particles is uniform. Therefore, light emitting diode packages with the lens can be a uniform light source.

A method for protecting a thermal barrier coating (TBC) which comprises voids is described. The method involves the step of electrophoretically depositing a mitigation coating material such as alumina to fill at least a portion of the voids. The TBC is often applied over a metal substrate, such as a turbine engine component. The voids can be in the form of vertical cracks within the TBC. A thermal barrier coating is also described, containing voids which extend into the coating from a top surface, wherein at least a portion of the voids is filled with a mitigation coating material.

The invention relates to a hydroxyapatite coating magnesium alloy medical implantation material and a preparation method thereof. The hydroxyapatite coating magnesium alloy medical implantation material is characterized in that: the surface of a magnesium alloy substrate is attached with a hydroxyapatite coating layer. The preparation method of the hydroxyapatite coating magnesium alloy medical implant material can adopt the bionic solution growing method, the ion beam deposition method, the coating and sintering process, the plasma spray method, the discharge plasma sintering method or the electrophoresis deposition method. The magnesium alloy material with the hydroxyapatite coating structure which is provided by the invention can effectively slow down the degradation rate of the magnesium alloy; at the same time, the coating layer can not only have great tissue compatibility, but can also be conductive to connective tissue attachment and the growth of the bone tissues, improve the bone healing rate and shorten the healing time.

One embodiment of the present invention provides a process for fabricating an electrode for a capacitor using carbon nanotubes (CNTs), wherein the electrode comprises a metal substrate and a layer of active material (CNTs) coated onto the metal substrate. Specifically, the process starts by dispersing CNTs in a solvent to form a suspension. Next, the CNTs are charged in the suspension. The metal substrate is then immersed in the suspension. Next, the CNTs are deposited onto the metal substrate using electrophoretic deposition (EPD) to form the layer of active material on the metal substrate. In particular, the layer of active material is formed on the metal substrate without using a binder, which effectively reduces contact resistance between the active material and the metal substrate.

Methods for fabricating a photovoltaic device on complexly shaped fabricated objects, such as car bodies are disclosed. Preferably the photovoltaic device includes absorber layers comprising Copper, Indium, Gallium, Selenide (CIGS) or Copper, Zinc, Tin, Sulfide (CZTS). The method includes the following steps: a colloidal suspension of metal surface-charged nanoparticles is formed; electrophoretic deposition is used to deposit the nanopartieles in a metal thin film onto a complexly shaped surface of the substrate; the metal thin film is heated in the presence of a chalcogen source to convert the metal thin film into a metal chalcogenide thin film layer; a buffer layer is formed on the metal chalcogenide thin film layer using a chemical bath deposition; an intrinsic zinc oxide insulating layer is formed adjacent to a side of the buffer layer, opposite the metal chalcogenide thin film layer, by chemical vapor deposition; and finally, a transparent conducting oxide is formed adjacent to a side of the intrinsic zinc oxide, opposite the buffer layer, by chemical vapor deposition.

The present invention provides methods for producing hollow ceramic membranes by electrophoretic deposition. The hollow ceramic membranes may have a small cross-sectional area of about 1.0x10<-5 >mm<2 >to about 25 mm<2>. The cross-sectional configuration of the hollow ceramic membranes may be any geometry such as circular, square, rectangular, triangular or polygonal. The hollow ceramic membranes produced by the methods of the present invention may have multiple layers but always the innermost layer, or the first deposited layer is porous and made by electrophoretic deposition. Subsequent layers may be porous or non porous and deposited before or after sintering the first layer. If it is deposited after sintering, it may require additional sintering steps. Additional layers may be deposited by further electrophoretic deposition, sol-gel coating, dip coating, vacuum casting, brushing, spraying or other known techniques.

The invention discloses a flexible electrochemical electrode, a continuous glucose monitoring sensor equipped therewith and a preparation method thereof. Golden layers on two sides of a chemical gold-plating film are utilized as a working electrode and a comparison-counter electrode in order to form an electrochemistry electrode system. Petal-shaped platinum nanoparticles are subjected to electro-deposition on the surface of the working electrode as a catalysis layer. Then, electrophoretic deposition carbon nanotube/Nafion mesh layer is utilized as an anti-interference layer. An enzyme biochemical sensitive layer is formed through static adsorption on the anti-interference layer and coated with a polyurethane mass transfer restriction protection layer after cross-linking and solidity of glutaraldehyde. Therefore, the continuous glucose monitoring sensor is prepared. Without lithography or screen printing and other technologies, an electrochemical electrode system can be constructed so that processing technology is effectively simplified and large scale production is easily achieved and production cost is lowered. In the meantime, advantages such as broad linear range, high interference immunity, high response sensitivity and long term stability are obtained.

The invention discloses a film for a graphene/porous nickel oxide composite super capacitor. The invention is characterized in that the film is of a disordered nano porous structure, the aperture range is 10 to 350nm, the thickness of the film is 1 to 5 mu m, and the weight ratio of graphene to nickel oxide is (0.5:100) to (2:100). The method for preparing the film comprises the following steps: dissolving graphite oxide sheets and magnesium nitrate into an isopropanol solution so as to form a positively-charged graphite oxide sheet sol, then carrying out electrophoretic deposition on the obtained sol so as to obtain a graphene film; and through taking the graphene film as a deposition carrier, preparing a three-dimensional porous film for the graphene/porous nickel oxide composite super capacitor by using a chemical bath film-coating method. The porous composite thin film prepared by the method has the advantages of good mechanical capacity and super-capacitance property, high-discharge specific capacitance, high-ratio charge-discharge properties, high cycle life and the like, and has wide application prospects in the fields such as electric automobiles, communication, consumer electronics, signal control and the like.

The invention provides a surface chemical metal plating carbon nanotube field-emission cathode preparation method, which belongs to a carbon nanotube field emission cathode technology, solves the shortcomings of the existing technology, improves the electronic conduction and emission capabilities of the carbon nanotube and enhances the contact between a carbon nanotube film and a substrate electrode. The preparation method comprises the following steps: the carbon nanotube is processed through purification, cutting, scattering, and then through sensitization and activation, the carbon nanotubesurface forms a noble metal catalytic center; then the carbon nanotube surface forms a metal layer through a chemical plating method, the surface chemical metal plating carbon nanotube is prepared into evenly and stably dispersed carbon nanotube electrophoresis liquid, and finally pulse electrophoresis deposition is used for preparing the cathode of the carbon nanotube. The surface chemical metalplating carbon nanotube has good electronic conduction and emission capabilities, the carbon nanotube field-emission cathode and a substrate electrode can form good attachment, and the invention canrealize large-area, imaging and uniform preparation for the carbon nanotube field-emission cathode.