1150 results about "Nanodiamond" patented technology

A fixed abrasive tool incorporating nanodiamond particles is described and disclosed. A fixed abrasive tool can include a polishing layer on a substrate. The polishing layer can include an organic matrix with nanodiamond particles therein. The polishing layer can be formed in a wide variety of configurations, depending on the specific polishing application. Most often, the polishing layer can include a plurality of projections which can have a wide variety of configurations in order to achieve a particular polishing performance. Nanodiamond particles used in the present invention can have a particle size from about 1 nm to about 50 nm, and preferably about 2 nm to about 10 nm. Optionally, the nanodiamond particles can include a carbonaceous coating. Such fixed abrasive tools can be formed by screen printing of a slurry of nanodiamond particles and an organic binder to form a predetermined three-dimensional pattern. Other methods can also be used to form the disclosed nanodiamond fixed abrasive tools. These fixed abrasive tools are particularly suitable for polishing expensive workpieces such as silicon wafers, integrated circuitry, gemstones, and hard drive platters.

Nitrogen vacancies in bulk diamonds and nanodiamonds can be used to sense temperature, pressure, electromagnetic fields, and pH. Unfortunately, conventional sensing techniques use gated detection and confocal imaging, limiting the measurement sensitivity and precluding wide-field imaging. Conversely, the present sensing techniques do not require gated detection or confocal imaging and can therefore be used to image temperature, pressure, electromagnetic fields, and pH over wide fields of view. In some cases, wide-field imaging supports spatial localization of the NVs to precisions at or below the diffraction limit. Moreover, the measurement range can extend over extremely wide dynamic range at very high sensitivity.

A bit for drilling subterranean formations that includes a bit body including a bearing surface; a cutting structure mounted on the bit body, and including a bearing surface, and an annular seal for retaining a grease between the bearing surfaces, the annular seal comprising a flexible and resilient seal body formed from an elastomer composition, wherein the elastomer composition comprises an elastomer material, a curing agent, and 10% or less by volume of a nanomaterial additive selected from one of nanotubes and clustered nanodiamonds is disclosed.

A method of depositing nanocrystalline diamond film on a substrate at a rate of not less than about 0.2 microns/hour at a substrate temperature less than about 500° C. The method includes seeding the substrate surface with nanocrystalline diamond powder to an areal density of not less than about 10¹⁰sites/cm², and contacting the seeded substrate surface with a gas of about 99% by volume of an inert gas other than helium and about 1% by volume of methane or hydrogen and one or more of acetylene, fullerene and anthracene in the presence of a microwave induced plasma while maintaining the substrate temperature less than about 500° C. to deposit nanocrystalline diamond on the seeded substrate surface at a rate not less than about 0.2 microns/hour. Coatings of nanocrystalline diamond with average particle diameters of less than about 20 nanometers can be deposited with thermal budgets of 500° C.-4 hours or less onto a variety of substrates such as MEMS devices.

A method of making a polycrystalline diamond cutter element includes forming a blend, comprising a first particle size of polycrystalline diamond particles and a second particle size of polycrystalline diamond particles; forming a suspension of nanocrystalline diamond particles suspended in a solvent; and mixing the blend into the suspension to form a polycrystalline diamond mixture comprising nanocrystalline diamond coated polycrystalline diamond particles. The mixture is sintered with a substrate at high temperature and high pressure to form the polycrystalline diamond cutter element.

A method to apply nano-crystalline diamond onto a selected substrate, including preparing Nanodiamond slurry of nanodiamond particles dispersed in a medium. The medium may include a liquid or a sol-gel. The selected substrate is immersed in the Nanodiamond slurry for a predetermined period of time. Then the substrate is removed from the slurry. The substrate is then dried with a flow of inert gas. The substrate is left coated with a coating of the nanodiamond particles that are highly adherently held by van der Waals forces.

Diamond-like carbon based energy conversion devices and methods of making and using the same which have improved conversion efficiencies and increased reliability are provided. In one aspect, such a device may include a cathode having a plurality of nano-diamond particles disposed in a metal matrix, where the plurality of nano-diamond particles protrude partially from the metal matrix. A layer of diamond-like carbon (DLC) may be deposited on the plurality of nano-diamond particles and the metal matrix. Additionally, an anode may be located in a position to face the plurality of nano-diamond particle protrusions.

The invention discloses a high thermal conductivity metal-based composite material with a hierarchical structure, and a preparation method of the high thermal conductivity metal-based composite material; the high thermal conductivity metal-based composite material and the preparation method are characterized in that a first stage composite material (composite material I) is formed by at least one nano-reinforced body and a metallic matrix, and a second stage composite material (composite material II) is formed by at least one micron-reinforced body and the composite material I, wherein the nano-reinforced body is selected from graphene, a carbon nano tube, carbon nano-fiber, a nano-graphite flake and nano-diamond, and at least has the size of 1-100nm along the one-dimensional direction; and the micron-reinforced body is selected from diamond, silicon carbide and silicon, and has the equivalent grain size of 30-600 mu m. The composite material has low and controllable coefficient of thermal expansion, high heat conductivity, thus being used as various heat management materials.

Disclosed is a polytetrafluoroethylene coating agent having low friction and high wear resistance, obtained by dispersing nanodiamond powder in a polar organic solvent, stirring the nanodiamond dispersion solution and a silane coupling agent, and stirring the silane-treated dispersion solution and an oily polytetrafluoroethylene coating solution, in which the silane coupling agent has at least one organic functional group selected from, but not limited to, a mercapto group and an amino group, the organic functional group exhibiting high bondability to polytetrafluoroethylene. A method of preparing the polytetrafluoroethylene coating agent and a method of using the polytetrafluoroethylene coating agent are also provided.

Nanodiamonds can be included in various compositions to take advantage of the ability of nanodiamond to bond with biological materials and to improve mechanical strength. Nanodiamonds can be dispersed in a biologically acceptable carrier to form various nanodiamond compositions. The presence of nanodiamonds can increase binding with many biological materials, making the compositions of the present invention useful for a large variety of purposes such as cleansing, testing and identification of materials, and treatment of adverse conditions. Specific examples of nanodiamond compositions that can be formulated include deodorants, toothpastes, shampoos, antibiotics, dermal strips, DNA test strips, skin cleansers, and the like. Similarly, nanodiamond particles can be included in a cosmetic nanodiamond composition within a cosmetically acceptable carrier. Cosmetic nanodiamond compositions can include, for example, nail polish, eyeliner, lip gloss, exfoliant, and the like.

A multilayer coating (MLC) is composed of two chemically different layered nanocrystalline materials, nanodiamond (nanoD) and nano-cubic boron nitride (nono-cBN). The structure of the MLC and fabrication sequence of layered structure are disclosed. The base layer is preferably nanoD and is the first deposited layer serving as an accommodation layer on a pretreated substrate. It can be designed with a larger thickness whereas subsequent alternate nano-cBN and nanoD layers are typically prepared with a thickness of 2 to 100 nm. The thickness of these layers can be engineered for a specific use. The deposition of the nanoD layer, by either cold or thermal plasma CVD, is preceded by diamond nucleation on a pretreated and/or precoated substrate, which has the capacity to accommodate the MLC and provides excellent adhesion. Nano-cBN layers are directly grown on nanodiamond crystallites using ion-assisted physical vapor deposition (PVD) and ion-assisted plasma enhanced chemical vapor deposition (PECVD), again followed by nanodiamond deposition using CVD methods in cycles until the intended number of layers of the MLC is obtained.

Disclosed herein is a method for chemically attaching carboxyl, alcohol, amine or amide groups to the surface of nanodiamond (ND) in a liquid phase. Also disclosed herein are a functional ND compound obtained by the method and use thereof. The method includes treating synthetic ND with a size of 1 nm-1OO nm with sonication and a strong acid to provide ND-(COOH)_n. The ND-(COOH)_n compound is used as a starting material to provide ND compounds having alcohol, amine or amide groups attached to the surfaces thereof. The surface-functionalized ND compounds are characterized by using an X-ray diffractometer, FTIR, AFM, particle size analyzer and zeta sizer. The ND compounds show functionalities as well as high solubility to provide stable ND solutions in a liquid phase. Therefore, the ND compounds may be used as diamond coating agents. The powder of the ND compounds may be used as materials for producing composites of polymers, plastics, synthetic fibers, ceramics, etc., or as additives for toothpaste, shampoos, soap and cosmetic compositions.

This invention relates to a method for preparing polishing paste containing high-purity nanoscale diamond for precision polishing of the small inner pores of ceramic ferrule used in optical fiber connector. The polishing paste is prepared from: diamond micropowder 0.05-5 wt.%, wetting agent 0.01-25 wt.%, surfactant 0.1-5 wt.%, dispersion stabilizer 0.1-50 wt.%, pH regulator 0.1-1 wt.%, and glycerol 14-99.64 wt.%. The purity of the diamond micropowder is greater than or equal to 99.9%, and the particle sizes are 100-200 nm. The polishing paste is amphipathic, and has such advantages as high polishing speed, high dispersion stability, and appropriate viscosity. The polishing paste can effectively prevent the generation of small inner pores on the surface of polished ceramic ferrule.

The invention provides an n-type nano-diamond film and a preparation method. The preparation method comprises the following steps: injecting donor impurity ions into a nano-diamond film by adopting an ion injection method; and performing vacuum annealing on the film to obtain the n-type nano-diamond film. The method uses the ion injection method to finish the step of doping, so that the phosphonium ions or oxonium ions of which the injected dose is 1,014 to 1,016 cm-2 are doped to nano-diamond crystal grains and crystal boundaries, and the defect that impurities are centralized in the crystal boundaries but cannot enter diamond crystal grains in the processes of chemical vapor deposition and doping is avoided; and after the vacuum annealing at the temperature of between 700 and 1,000 DEG C, the n-type diamond film which has lower resistivity and higher Hall mobility is obtained. Therefore, the n-type nano-diamond film has very important scientific significance and engineering value for the application of the film in the field of semiconductor devices, field emission displays, electrochemistry and the like.

A casting infiltration method capable of increasing the hardness and the wear resistance of castings comprises the following steps: preparing composite coating, coating the prepared composite coating on lost foams or sand molds corresponding to the set position of which the hardness and the wear resistance are needed to increase, forming a composite coating layer, closing the molds, then casting according to the known conventional method; after depanning, quenching and tempering to the composite coating layer position; the key point is that the composite coating is paste coating which is prepared by mixing 65-70wt% of diamond nanometer powder or ceramic nanometer powder with 35-30wt% of polyving alcohol condensation product and then adding water, and the composite coating is coated on the set position of lost foams or sand molds for 3-4 times to reach the set thickness. The invention has simple process; by adopting nanometer diamond powder, the hardness and the wear resistance on the set position of the castings can be greatly improved and no interfacial effect can be generated between the castings substrate and the penetration layer; in addition, the penetration layer part has strong impact resistance.

The present invention discloses a nanodiamond thermal grease, which comprises a nanodiamond powder, a thermal powder and a substrate. The nanodiamond powder has volume percentage of 5% to 30%, the thermal powder has volume percentage of 40% to 90%, and the substrate has volume percentage of 5% to 30%. The nanodiamond powder and the thermal powder are distributed uniformly in the substrate to form the nanodiamond thermal grease having high thermal conductivity.

The presence of large amounts of non-diamond carbon in detonation synthesized nanodiamond (ND) severely limits applications of this exciting nanomaterial. An environmentally-friendly process is disclosed to selectively remove sp²-bonded carbon from ND. The content of up to 96% of sp³-bonded carbon in the oxidized samples is comparable to that found in microcrystalline diamond and is unprecedented for ND powders. Transmission electron microscopy and Fourier transform infrared spectroscopy studies show high purity 5-nm ND particles covered by oxygen-containing surface functional groups. The surface functionalization can be controlled by subsequent treatments. In contrast to current purification techniques, the disclosed process does not require the use of toxic or aggressive chemicals, catalysts or inhibitors and opens avenues for numerous new applications of nanodiamond.

The present invention includes a composition for implantation in a patient, comprising surface-functionalized nanodiamonds and at least one biodegradable biocompatible polymer. The present invention also includes a surgical fixation device for use in a patient.

The invention provides a nano-diamond film with Si-V luminescence and a preparation method thereof. The nano-diamond film is prepared on a single crystal silicon substrate by use of a hot filament chemical vapor deposition method; heat preservation is performed on the film for 5-150 minutes in air at a temperature ranging from 500 to 700 DEG C, and then the nano-diamond film with Si-V luminescence is obtained. The nano-diamond film prepared has relatively high Si-V luminescence intensity which has very important scientific significance and engineering value for the application of the nano-diamond film in the fields such as single photon sources, quantum information processing, photoelectric devices, biomarkers, semiconductor devices and field emission displays.

The invention provides a method for preparing a diamond-macromolecular composite abrasive. The cores of composite abrasive particles are diamond powder prepared by a mechanical crushing method, an explosive synthesis method or a static pressure method, and the particle diameter range of the powder is 1 to 100 nanometers; the powder serving as the core is modified to form an intermediate transition layer through a silane coupling agent, and the intermediate transition layer is grafted and wrapped to form the composite abrasive by using epoxy resin and polyacrylate, wherein the mass of the silane coupling agent is 0.2 to 2 percent of that of the nano particles; and the mass of the epoxy resin and the polyacrylate is 0.2 to 2 percent of that of inorganic nano particles. The compatibility between the abrasive and a polishing pad base body is improved, and the nano diamond composite abrasive treated by different macromolecules can be selected according to different polishing pad base bodies. By introducing groups to the surface of the diamond abrasive, the bonding force between the diamond abrasive and the polishing pad base body is improved, drop of the diamond abrasive is reduced, and surface damage of a machined workpiece due to drop of the diamond abrasive in the polishing process is prevented.