120 results about "Multi shell" patented technology

Embodiments of the invention provide a method for direct heteroepitaxial growth of vertical III-V semiconductor nanowires on a silicon substrate. The silicon substrate is etched to substantially completely remove native oxide. It is promptly placed in a reaction chamber. The substrate is heated and maintained at a growth temperature. Group III-V precursors are flowed for a growth time. Preferred embodiment vertical Group III-V nanowires on silicon have a core-shell structure, which provides a radial homojunction or heterojunction. A doped nanowire core is surrounded by a shell with complementary doping. Such can provide high optical absorption due to the long optical path in the axial direction of the vertical nanowires, while reducing considerably the distance over which carriers must diffuse before being collected in the radial direction. Alloy composition can also be varied. Radial and axial homojunctions and heterojunctions can be realized. Embodiments provide for flexible Group III-V nanowire structures. An array of Group III-V nanowire structures is embedded in polymer. A fabrication method forms the vertical nanowires on a substrate, e.g., a silicon substrate. Preferably, the nanowires are formed by the preferred methods for fabrication of Group III-V nanowires on silicon. Devices can be formed with core / shell and core / multi-shell nanowires and the devices are released from the substrate upon which the nanowires were formed to create a flexible structure that includes an array of vertical nanowires embedded in polymer.

The invention provides a multi-shell-layer metal oxide hollow ball and a preparation method thereof. A hydrothermal method is used for preparing a carbon ball template; metal salts are dissolved in carbon ball suspension liquid, and the gradient distribution, the depth and the number of metal salts entering carbon balls are controlled through regulating adsorption conditions such as metal salt concentration, solution pH value, soaking temperature and time and the like; and the heat treatment is carried out on the carbon balls adsorbing metal ions, and the multi-shell-layer metal oxide hollow ball can be obtained. The shell-layer of the hollow ball prepared by the method is formed by accumulating nanometer crystal particles of metal oxides, the shell layer number can be regulated and changed from two to four, and both the size of the hollow ball and the thickness of the shell layers are controllable. The method provided by the invention is simple and is easy to implement, the controllability is high, the pollution is little, the cost is low, and in addition, the general applicability is realized. The prepared product has a hollow structure and the shell layers with the thickness inthe nanometer level, simultaneously, the internal space can be effectively utilized through the multilayer structure, and the multi-shell-layer metal oxide hollow ball is applied to gas sensitivity and photocatalysis and has the more excellent performance through being compared with the traditional nanometer material and a single-layer hollow ball.

Disclosed is a light emitting element, which emits light with small power consumption and high luminance. The light emitting element has: a IV semiconductor substrate; two or more core multi-shell nanowires disposed on the IV semiconductor substrate; a first electrode connected to the IV semiconductor substrate; and a second electrode, which covers the side surfaces of the core multi-shell nanowires, and which is connected to the side surfaces of the core multi-shell nanowires. Each of the core multi-shell nanowires has: a center nanowire composed of a first conductivity type III-V compound semiconductor; a first barrier layer composed of the first conductivity type III-V compound semiconductor; a quantum well layer composed of a III-V compound semiconductor; a second barrier layer composed of a second conductivity type III-V compound semiconductor; and a capping layer composed of a second conductivity type III-V compound semiconductor.

The present disclosure relates to a method to estimate a subsurface formation property. A downhole logging tool is provided and disposed in a wellbore. Multiple measurements of various measurement types are obtained at various depths of investigation using the downhole logging tool. The multiple measurements may include natural gamma ray measurements, density measurements, resistivity measurements, nuclear measurements, and nuclear magnetic resonance measurements. The signal-to-noise ratio of the measured signals is increased using, for example, lateral stacking and multi-shell inversion. The subsurface formation property is estimated using the increased signal-to-noise ratio signals. The subsurface formation property may include porosity, adsorbed gas volume, free gas volume, bound water volume, free water volume, oil volume, and kerogen volume. A fluid analysis may be performed using a multi-dimensional nuclear magnetic resonance technique. Fluids such as water, oil, gas, and oil-based mud in the wellbore may be identified and / or evaluated.

The development of miniaturized chromatographic systems localized within individual polymer microspheres and their incorporation into a bead-based cross-reactive sensor array platform is described herein. The integrated chromatographic and detection concept is based on the creation of distinct functional layers within the microspheres. In this first example of the new methodology, complexing ligands have been selectively immobilized to create “separation” layers harboring an affinity for various analytes. Information concerning the identities and concentrations of analytes may be drawn from the temporal properties of the beads' optical responses. Varying the nature of the ligand in the separation shell yields a collection of cross-reactive sensing elements well suited for use in array-based micro-total-analysis systems.

A doping method for forming quantum dots is disclosed, which includes following steps: providing a first precursor solution for a group II element and a second precursor solution for a group VI element; heating and mixing the first precursor solution and the second precursor solution for forming a plurality of II–VI compound cores of the quantum dots dispersing in a melting mixed solution; and injecting a third precursor solution for a group VI element and a forth precursor solution with at least one dopant to the mixed solution in turn at a fixed time interval in order to form quantum dots with multi-shell dopant; wherein the dopant described here is selected from a group consisting of transitional metal and halogen elements. This method of the invention can dope the dopants in the inner quantum dot and enhance the emission intensity efficiently.

A doping method for forming quantum dots is disclosed, which includes following steps: providing a first precursor solution for a group II element and a second precursor solution for a group VI element; heating and mixing the first precursor solution and the second precursor solution for forming a plurality of II-VI compound cores of the quantum dots dispersing in a melting mixed solution; and injecting a third precursor solution for a group VI element and a forth precursor solution with at least one dopant to the mixed solution in turn at a fixed time interval in order to form quantum dots with multi-shell dopant; wherein the dopant described here is selected from a group consisting of transitional metal and halogen elements. This method of the invention can dope the dopants in the inner quantum dot and enhance the emission intensity efficiently.

A composition comprising a plurality of coated metal particles with a metal core surrounded by nested shells formed by an electrically conductive layer and by a barrier layer, at least one of the shells being formed by electroless plating. The invention also comprises a method of producing such compositions as well as the use of the composition in, for example, crystalline-silicon solar cell devices having contact structures formed on one or more surfaces of a solar cell device, such as those used in back contact solar cell devices or emitter wrap through (EWT) solar cell devices.

The invention provides a cobaltosic oxide multi-shell hollow sphere cathode material for a lithium ion battery and a preparation method thereof. The method comprises the steps of: taking a carbon sphere prepared by a hydrothermal method as a template; controlling the quantity of cobalt ions in the carbon sphere and the entering depth thereof by controlling the ratio of water to ethanol in a cobalt salt solution, the temperature of the solution and the adsorption capacity of the carbon sphere; and preparing single-shell, dual-shell, tri-shell and four-shell cobaltosic oxide hollow spheres. The lithium ion battery of taking the cobaltosic oxide multi-shell hollow sphere as a cathode has large specific surface area and a plurality of lithium ion storage sites; the specific capacitance is improved; meanwhile, the appropriate multi-shell cavity structure not only can adjust the electrode structure and volume change, but also can effectively reduce the transmission distance between the lithium ion and electrons. Thus, the cycling performance and rapid charge and discharge capacity are obviously improved. The method disclosed by the invention is convenient and concise to operate, and high in controllability, and has a wide application prospect; and the performance of the lithium ion battery can be obviously improved.

The invention relates to the combined multi-shell spiral baffle board shell-and-tube exchanger, which includes the shell. One end of the shell is set with the pipe side inlet and the pipe side outlet. The heat exchanging bundle is through the baffle board and connected to the two pipe boards in two ends of the shell. The first internal bushing is set in the shell and the second is set out of the first internal bushing. One end of the second internal bushing is connected to the pipe board and one end of the first internal bushing is set with the clapboard; the shell is installed with the inlet pipe of the out shell and the outlet pipe of the inner shell. The out shell and the middle shell use the whole continuously spiral baffle board; the inner shell uses the non continuously spiral baffle board or bow baffle board or disc-ring baffle board or baffle pole or the whole round baffle board or not setting the baffle board; the baffle board of every shell has the self anti dirty hole. The invention has simplified the process and decreased the pressure loss but increased the compaction and self anti-dirty ability of the heat exchanger; also it decreases the cleaning cost and prolongs the using life.

An air intake manifold assembly for an internal combustion engine composed of a plurality of molded synthetic resin shells assembled to each other so as to define a plenum chamber, a plurality of inlet channels leading from said plenum chamber to cylinder inlets of the internal combustion engine, and a throttle body passageway leading from a throttle body mount into the plenum chamber; with a groove formed in a surface of at least one of the shells facing an adjacent shell and extending from an inlet opening to the throttle body passageway or the plenum chamber so as to form an elongate passage between the assembled shells leading from the inlet to the throttle body passage or plenum chamber, and a method of forming such an intake manifold assembly.

The present invention to an active muffler for an exhaust gas system of an internal combustion engine, in particular in a motor vehicle, includes a multi-shell housing having a pot-shaped top shell and a pot-shaped bottom shell, a funnel-shaped sound conducting body, which is inserted into the bottom shell and has a connection passing through the bottom shell and out of the housing, a loudspeaker, which is situated in the top shell and is attached to a flange section of the sound conducting body at a distance from the connection, such that a free inside cross section of the sound conducting body surrounded by the flange section is closed with an airtight seal, and a bypass through which an interior space of the top shell is connected to an interior space of the bottom shell so they communicate.

Suitable means for driving a flow are arranged in annular or ring-segment-shaped cavities that are formed in particular in multi-shell casings of turbomachines. Arranged inside the cavity are ejectors that are supplied via suitable means with a motive-fluid flow which in turn excites the flow, preferably a circumferential flow or a helical flow. The invention is suitable in particular for avoiding casing distortions when turbomachines are at rest.

Construction and use of an inner shell for a multi-shelled gamut boundary descriptor (GBD) for a source device based on a predesignated outer shell for the source device, for use in gamut-mapping from the gamut of the source device to a gamut of a destination device. An inner shell and outer shell for the destination device is accessed, and a determination is made of an amount by which the inner shell of the destination device is smaller than the outer shell of the destination device. The inner shell of the source device is thereafter constructed by reducing the outer shell of the source device based at least in part on the amount by which the inner shell of the destination device is smaller than the outer shell thereof. The construction can be performed on the entirety of the GBD or only on parts thereof, such as a hue slice.

Belonging to the technical field of olefin production, the invention relates to combined heat exchange type multi-shell side methanol-to-olefin fixed bed production equipment and a production method thereof, thereby solving the technical problems of complex reaction equipment and difficult control of heat transfer in existing fixed bed reactors. The invention firstly puts forward the combined at exchange type multi-shell side methanol-to-olefin fixed bed production equipment, which includes a main reactor. Partition plates are mounted between an upper tube plate and a lower tube plate of the main reactor, and divide the cavity surrounded by the upper tube plate, the lower tube plate and the reactor body into 2-10 heat exchange shell sides that are not communicated to each other. The heat exchange shell sides include a first heat exchange shell side and the rest heat exchange shell sides, and column tubes run through the partition plates. The reactor body of each heat exchange shell side is provided with a cooling medium inlet and a cooling medium outlet. The invention also provides a method for production of olefin by the equipment. By means of combined high efficiency heat exchange, the proportion of water vapor in the feed gas and the load of a feed gas heating furnace can be reduced.

The invention discloses a method for preparing a multi-shell hollow structure metal organic framework material. The method comprises: preparing a metal organic framework material (MOF), dispersing in a protic solvent, and etching to obtain monolayer hollow MOF; epitaxially growing by using the MOF as a crystal seed to obtain MOF@MOF, dispersing in a protic solvent, and etching to obtain double-layer hollow MOF; and repeatedly performing epitaxial growth to obtain multi-shell MOF, and finally etching to obtain the multi-shell hollow structure MOF. According to the present invention, the method has advantages of simpleness, easy performing, mild condition, high safety and broad application prospect, and can obtain the multi-shell hollow MOF.

The invention provides a preparation method of a yolk type double-shell-layer hollow composite wave absorption material. A double-shell-layer hollow composite microsphere is used as a template; a transition layer covers the surface; the multi-shell-layer hollow composite microsphere is obtained; the multi-shell-layer hollow composite microsphere is used as a template; a dielectric layer with a dielectric loss function covers the surface; then, the transition layer is removed to obtain the yolk type double-shell-layer hollow composite wave absorption material. The prepared material is a composite wave absorption material with strong wave absorption, wide frequency band and light weight; the magnetic loss and the electric loss are integrated; the wave absorption performance of the compositematerial is enhanced; the wave absorption frequency band of the composite material is widened; in addition, the unique yolk hollow double-space structure is realized, so that the composite material has the lower density and lighter weight on the basis of maintaining the excellent wave absorption performance; the requirements of strong wave absorption, wide frequency band and light weight of the modern wave absorption material can be met.

Methods of preparing a multi-shell nanocrystal structure, multi-shell nanocrystal structures thus obtained, and a fabricated device including the same are provided. A multi-shell nanocrystal structure may be formed by preparing a core nanocrystal and reacting the core nanocrystal with two or more precursors having different reaction rates to sequentially form two or more layers of shell nanocrystals having different compositions on a surface of the core nanocrystal.

The invention relates to a multi-shell metal oxide hollow sphere synthesized based on anion adsorption and a preparation method as well as application thereof. The preparation method of the multi-shell metal oxide hollow sphere synthesized based on the anion adsorption comprises the following steps of using a carbon sphere prepared by utilizing a hydrothermal method as a template, and obtaining the metal oxide hollow sphere with a multi-shell structure through uniformly dispersing the carbon sphere template in a metal anionic salt solution and further roasting an obtained mixture at a high temperature. The hollow sphere prepared by adopting the method can be modulated in the number of shells between two layers and five layers, is controllable in size and shell wall thickness, is applied to the field of lithium ion batteries, shows performance superior to that of a nano sheet or a single-shell hollow sphere, and has a wide application prospect; the advantages of a low-dimensional nano material and a three-dimensional hollow structure are effectively combined.

A multi-hole-and-shell nickel phosphide hollow microsphere compound is provided with a multi-hole secondary nanostructure, and the chemical formula of the multi-hole-and-shell nickel phosphide hollow microsphere compound is Ni2P, wherein Ni to P is 2:1; the diameter of the microsphere is 1.5-2.5 [mu]m, and multi-hole shells are formed by assembling secondary nano particles being 12-17 nm; a solid phase phosphide multi-shell NiO precursor method is adopted for preparation of the multi-hole-and-shell nickel phosphide hollow microsphere compound, and a precursor NiO of the method is prepared through a self-template method; and a material can form a three-electrode system for testing of an electro-catalysis hydrogen evolution property of the material. The multi-hole-and-shell nickel phosphide hollow microsphere compound has the advantages that a multi-hole-and-shell hollow structure formed by assembling the nano particles is advantageous to interface contact of electrode gas-liquid-solid three phases, a better material conveying channel can be provided, and a structural unit of the nano particles can provide more catalytic active sites, so that electro-catalysis activity of the multi-hole-and-shell nickel phosphide hollow microsphere compound is effectively improved, and meanwhile, a product has good electrochemical stability and can serve as a novel catalyst to be applicable to electrolysed water and the like.

Embodiments of the invention provide a method for direct heteroepitaxial growth of vertical III-V semiconductor nanowires on a silicon substrate. The silicon substrate is etched to substantially completely remove native oxide. It is promptly placed in a reaction chamber. The substrate is heated and maintained at a growth temperature. Group III-V precursors are flowed for a growth time. Preferred embodiment vertical Group III-V nanowires on silicon have a core-shell structure, which provides a radial homojunction or heterojunction. A doped nanowire core is surrounded by a shell with complementary doping. Such can provide high optical absorption due to the long optical path in the axial direction of the vertical nanowires, while reducing considerably the distance over which carriers must diffuse before being collected in the radial direction. Alloy composition can also be varied. Radial and axial homojunctions and heterojunctions can be realized. Embodiments provide for flexible Group III-V nanowire structures. An array of Group III-V nanowire structures is embedded in polymer. A fabrication method forms the vertical nanowires on a substrate, e.g., a silicon substrate. Preferably, the nanowires are formed by the preferred methods for fabrication of Group III-V nanowires on silicon. Devices can be formed with core / shell and core / multi-shell nanowires and the devices are released from the substrate upon which the nanowires were formed to create a flexible structure that includes an array of vertical nanowires embedded in polymer.

The invention provides a single-particle nano crystal with three-primary-color luminescence and a preparation method thereof. The single-particle nano crystal has a core-shell structure and sequentially comprises an inner core, a first shell, a second shell, a third shell and a fourth shell from inside to outside, wherein the inner core, the second shell and the fourth shell are luminous shells, and the first shell and the third shell are inert shells. The three luminous shells separately contain Yb<3+> / Tm<3+>, Er<3+> or Nd<3+> / Yb<3+> / Er<3+> ions, and the luminescent shells respectively radiate red, green and blue lights under the action of a laser. According to the invention, shell stock solutions with different components are continuously and thermally injected by adopting a one-pot method, and compared with a conventional batch thermal injection method, the one-pot method has the advantages that the time required for synthesizing nano particles with a multilayer core-shell structureis greatly saved. Through constructing a ''core-multi-shell'' structure, concentration quenching and luminescence color crosstalk are inhibited, and high-efficiency pure-color three-primary-color luminescence is realized. The nano crystal has a real-time color adjustment capability in full color gamut, and the adjustment method is simple and convenient.

A method for fiber tractography processes multi-shell diffusion weighted MRI data to identify fiber tracts by calculating intravoxel diffusion characteristics from the MRI data. A transition probability is calculated for each possible path on the lattice, with the transition probability weighted according the intravoxel characteristics. Entropy is calculated for each path and the paths are ranked according to entropy. A geometrical optics algorithm is applied to the entropy data to define pathways, which are ranked according to their significance to generate a map of the pathways.

The invention provides a simple method for preparing titanium dioxide multi-shell hollow spheres and a sphere-in-sphere structure. The method comprises the following steps: 1) adopting a dispersion polymerization method to prepare polystyrene used as seed spheres; 2) adopting a seed swelling polymerization method to prepare porous polystyrene-divinylbenzene high-polymer microspheres; 3) preparing titanium dioxide sol and a polymer / titanium dioxide composite: using isopropyl titanate, ethanol, deionized water and nitric acid to prepare the titanium dioxide sol, extracting the polymer microspheres prepared in the step 2) with toluene to be used as the polymer template and dispersing the polymer template in the titanium dioxide sol to prepare the polymer / titanium dioxide composite; and 4) putting the polymer / titanium dioxide composite in a muffle furnace which is preheated to 300-550 DEG C, and calcining to remove the polymer template and obtain the titanium dioxide multi-shell hollow spheres and sphere-in-sphere structure. The method provided by the invention is simple and practical and can be used to obtain the multi-shell hollow spheres and sphere-in-sphere structure. However, the traditional template-removing method can only obtain the porous titanium dioxide solid structure.

The present disclosure relates to a method to estimate a subsurface formation property. A downhole logging tool is provided and disposed in a wellbore. Multiple measurements of various measurement types are obtained at various depths of investigation using the downhole logging tool. The multiple measurements may include natural gamma ray measurements, density measurements, resistivity measurements, nuclear measurements, and nuclear magnetic resonance measurements. The signal-to-noise ratio of the measured signals is increased using, for example, lateral stacking and multi-shell inversion. The subsurface formation property is estimated using the increased signal-to-noise ratio signals. The subsurface formation property may include porosity, adsorbed gas volume, free gas volume, bound water volume, free water volume, oil volume, and kerogen volume. A fluid analysis may be performed using a multi-dimensional nuclear magnetic resonance technique. Fluids such as water, oil, gas, and oil-based mud in the wellbore may be identified and / or evaluated.

The invention discloses a method for preparing a hydrotalcite material adopting a multi-shell hollow structure. The method comprises the following steps: firstly, preparing a metal organic framework material (MOF-1), epitaxially growing to obtain MOF-1@MOF-2, and then etching by a sacrificial template method to obtain single-layer hollow hydrotalcite (LDH); with MOF as a seed crystal, epitaxiallygrowing to obtain MOF-1@MOF-2@MOF-1@MOF-2, and then etching by the sacrificial template method to obtain double-layer hollow LDH; repeating the epitaxially growing step to obtain multi-shell MOF, andfinally etching to obtain the LDH adopting the multi-shell hollow structure. The method is simple, easy to implement, mild in condition and high in safety; by the method, the multi-shell hollow LDH can be obtained; the method has a wide application prospect.

The invention provides a stannic oxide (SnO2) membrane electrode material for a dye-sensitized solar cell and a preparing method thereof. A carbon sphere synthesized through a hydrothermal method is utilized as a formwork, alkali treatment is carried out on the carbon sphere formwork to enhance the adsorbing capacity of the surface layer of the carbon sphere formwork to stannic ions, meanwhile the concentration of precursor tin salt solution is regulated to prepare the stannic oxide multi-shell hollow sphere with two adjacent outmost shells, and the hollow spheres are utilized as the dye-sensitized solar cell electrode materials to increase transmission paths of light in the membrane electrode. The stannic oxide membrane electrode material has excellent light scattering capacity, improves the absorption rate of dye molecules to light and obviously improves the photoelectric converting efficiency of the dye-sensitized solar cell. In addition, the preparing method has certain universality. The Zno, TiO2, Co3O4, CuO and Fe2O3 multi-shell hollow sphere with the two adjacent outmost shells is prepared by changing metal precursor salt solution. The preparing method is convenient to operate, high in controllability and wide in application prospect.

The invention relates to a multi-shell-pass tube type heat exchanger, which mainly solves the problems that in the prior art multiple heat exchangers are adopted when a fluid is in heat exchange with various other fluids sequentially, the equipment and pipelines are not compact, the investment is large, the system resistance is large and the power consumption is large. The multi-shell-pass tube type heat exchanger comprises a tube pass fluid inlet, a tube box, a heat exchange area and a tube pass fluid outlet; the heat exchange area comprises a heat exchange tube nest for allowing tube pass fluid to pass through, baffle plates, shell pass fluid inlets and shell pass fluid outlets; a sealing clapboard is utilized for dividing the shell pass of the heat exchange area into at least two mutually independent shell pass heat exchange sub-areas, the independent shell pass heat exchange sub-areas are provided with independent shell pass fluid inlets and shell pass fluid outlets. By adopting the technical scheme, the problems are well solved, and the multi-shell-pass tube type heat exchanger can be applied to tube type heat exchanger combination in the petrochemical industry, the chemical engineering industry and the like.