摘要:
A coated medical implant, such as a coated dental component, is provided, the coated medical implant including a substrate surface formed of a material comprising available hydroxyl groups and a silicon oxide coating layer chemisorbed on the substrate surface. A method for the preparation of such coated implants is also provided, the method involving application of the silicon oxide coating layer to the substrate surface by chemical vapor deposition. A dental structure is also provided, which includes a first dental component having a substrate surface formed of a material comprising available hydroxyl groups; a silicon oxide coating layer chemisorbed on the substrate surface; a silane coupling agent overlying and covalently attached to the silicon oxide layer; a dental cement overlying and coupled to the silane coupling agent; and a second dental component having a surface bonded to the dental cement.
摘要:
A coated medical implant, such as a coated dental component, is provided, the coated medical implant including a substrate surface formed of a material comprising available hydroxyl groups and a silicon oxide coating layer chemisorbed on the substrate surface. A method for the preparation of such coated implants is also provided, the method involving application of the silicon oxide coating layer to the substrate surface by chemical vapor deposition. A dental structure is also provided, which includes a first dental component having a substrate surface formed of a material comprising available hydroxyl groups; a silicon oxide coating layer chemisorbed on the substrate surface; a silane coupling agent overlying and covalently attached to the silicon oxide layer; a dental cement overlying and coupled to the silane coupling agent; and a second dental component having a surface bonded to the dental cement.
摘要:
A fluoride treated medical implant, such as a dental component, is provided, the medical implant comprising fluorinated metal oxide on the substrate surface. A method for the preparation of such treated implants is also provided, the method involving exposure of the medical implant to a fluorine-containing reagent. A dental structure is also provided, which includes a first dental component comprising a fluorinated metal oxide layer on its surface, a silane coupling agent, a dental cement, and a second dental component having a surface bonded to the dental cement. An additional dental structure, which includes a first dental component comprising a fluorinated metal oxide layer on its surface, a dental cement, and a second dental component having a surface bonded to the dental cement is also provided.
摘要:
An electrode for electrochemical uses is made of a conductive metal mesh coated with boron-doped diamond. The electrode may be used in electrochemical reactions either as a cathode or as an anode, or can be used with an alternating current.
摘要:
A diamond-based structure includes a substrate, an adhesive material on a face of the substrate, and an array of spaced apart diamond mesas bonded to the substrate by the adhesive material. In particular, each of the diamond mesas can have a growth surface adjacent the substrate and an interfacial surface opposite the substrate, and the interfacial surface can be smooth relative to the growth surface. This structure can be fabricated by providing a sacrificial substrate, forming a plurality of diamond mesas on a face of the sacrificial substrate, bonding the diamond mesas to a transfer substrate, and removing the sacrificial substrate. Accordingly, the interfacial surfaces of the diamond, which are formed adjacent the sacrificial substrate and then exposed by removing the substrate are smooth.
摘要:
A microelectronic structure including a plurality of spaced apart diamond structures on which a plurality of semiconductor devices may be formed. The semiconductor devices include a semiconducting diamond layer on each of the diamond structures. The diamond structures are preferably oriented relative to a single crystal nondiamond substrate so that the diamond structures have a (100)-oriented outer face for forming the semiconductor devices thereon. The microelectronic structure may be diced into discrete devices, or the devices interconnected, such as to form a higher powered device. One embodiment of the microelectronic structure includes the plurality of diamond structures, wherein each diamond structure is formed of a highly oriented textured diamond layer approaching single crystal quality, yet capable of fabrication on a single crystal nondiamond substrate. A method for fabricating the nondiamond highly oriented textured diamond layer includes carburizing a face of the nondiamond substrate, nucleating the carburized face by electrical bias enhanced nucleation, and selectively growing diamond favoring growth of the (100)-oriented grains.
摘要:
A method and apparatus for enhancing the nucleation of diamond by pretreating a substrate by electrically biasing a diamond film adjacent the substrate while exposing the substrate and the thus biased diamond film to a carbon-containing plasma. The bias pretreatment may be maintained for a time period in the range of about 1 hour to 2 hours to achieve a high diamond nucleation density. Alternatively, the biasing may be continued until diamond film formation is indicated by a change in reflectivity of the surface of the substrate. The biasing pretreating may be used to nucleate diamond heteroepitaxially on a substrate having a surface film formed of a material having a relatively close lattice match to diamond, such as .beta.-silicon carbide. The apparatus includes a laser reflection interferometer to monitor the surface of the substrate. The laser reflection interferometer is used to monitor growth of the diamond film and cooperates with a controller to control the processing parameters during the diamond growing process.
摘要:
The present disclosure is directed to a system and method for sonically activating cement slurries. In some implementations, a method of treating a subterranean formation includes positioning a settable composition including a capsule in a wellbore. The capsule is used to increase a setting rate in response to at least sonic signals. A sonic signal is transmitted to at least a portion of the settable composition to release an activator from the capsule.
摘要:
The highly-oriented diamond film is a diamond film formed by chemical vapor deposition, with at least 95% of its area consisting of either (100) or (111) crystal planes, and the differences {.DELTA..alpha., .DELTA..beta., .DELTA..gamma.} of the Euler angles {.alpha., .beta., .gamma.} between the adjacent crystals satisfying (.vertline..DELTA..alpha..vertline..ltoreq.1.degree., .vertline..DELTA..beta..vertline..ltoreq.1.degree. and .vertline..DELTA..gamma..vertline..ltoreq.1.degree.) simultaneously. Thus obtained highly-oriented diamond film has few grain boundaries and high carrier mobility. And the area of the diamond film can be large.
摘要:
A source electrode is formed on the first semiconducting diamond film and a drain electrode is formed on the second semiconducting diamond film. A highly resistant diamond film having a thickness of between 10 .ANG. and 1 mm and an electrical resistance of at least 10.sup.2 .OMEGA..cm or more is placed between the first and second semiconducting diamond films. A gate electrode is formed on the highly resistant diamond film. Thereby, a channel region is formed by these first and second semiconducting diamond films as well as the highly resistant diamond film. All or at least a part of said first and second semiconducting diamond films and the highly resistant diamond film are made of highly-oriented diamond films where either (100) or (111) crystal planes of diamond cover at least 80% of the film surface, and the differences {.DELTA..alpha., .DELTA..beta., .DELTA..gamma.} of Euler angles {.alpha., .beta., .gamma.} which represent the crystal plane orientation, satisfy .vertline..DELTA..alpha..vertline.