摘要:
A nanotube-based insulator is provided having thermal insulating properties. The insulator can include a plurality of nanotube sheets stacked on top of one another. Each nanotube sheet can be defined by a plurality of carbon nanotubes. The plurality of carbon nanotubes can be configured so as to decrease normal-to-plane thermal conductivity while permitting in-plane thermal conductivity. A plurality of spacers can be situated between adjacent nanotube sheets so as to reduce interlayer contact between the nanotubes in each sheet. The plurality of spacers can be ceramic or alumina dots or provided by texturing the nanotube sheets.
摘要:
Systems for producing electrical energy from heat are disclosed. The system may include a carbon-nanotube based pathway along which heat from a source can be directed. An array of thermoelectric elements for generating electrical energy may be situated about a surface of the pathway to enhance the generation of electrical energy. A carbon nanotube-based, heat-dissipating member may be in thermal communication with the array of thermoelectric elements and operative to create a heat differential between the thermoelectric elements and the pathway by dissipating heat from the thermoelectric elements. The heat differential may allow the thermoelectric elements to generate the electrical energy. Methods for producing electrical energy are also disclosed.
摘要:
A nanotube-based insulator is provided having thermal insulating properties. The insulator can include a plurality of nanotube sheets stacked on top of one another. Each nanotube sheet can be defined by a plurality of carbon nanotubes. The plurality of carbon nanotubes can be configured so as to decrease normal-to-plane thermal conductivity while permitting in-plane thermal conductivity. A plurality of spacers can be situated between adjacent nanotube sheets so as to reduce interlayer contact between the nanotubes in each sheet. The plurality of spacers can be ceramic or alumina dots or provided by texturing the nanotube sheets.
摘要:
A heat-conducting medium for placement between a heat source and heat sink to facilitate transfer of heat from the source to the sink is provided. The heat-conducting medium can include a flexible member made from an array of interweaving carbon nanotubes. The heat-conducting medium may also include an upper surface against which a heat source may be placed, an opposing lower surface and edges about the member designed for coupling to a heat sink toward which heat from the heat source can be directed. The heat-conducting medium may also include a pad placed on the upper surface to provide structural support to the member. A method for manufacturing the heat-conducting medium is also provided.
摘要:
Hybrid conductors capable of achieving enhanced conductivity and current capacity over a wide range of frequencies are disclosed. The hybrid conductors may be used in electrical or thermal applications, or combinations of both. One method of fabricating such hybrid conductors includes complexing conductive metal elements (e.g., silver, gold, copper), transition metal elements, alloys, wires, or combinations thereof, with carbon nanotube materials. In the alternative, the hybrid conductors may be formed by doping the carbon nanotube materials in salt solutions.
摘要:
A method for manufacturing a carbon composite is provided. The method includes providing a carbon-containing resin material to which an appropriate concentration of catalyst particles may be added. Thereafter, the catalyzed resin may be subject to a high temperature range, at which point carbon in the resin to begins to couple to the catalyst particles. Continual exposure to high temperature leads to additional attachment of carbon to existing carbon on the particles. Subsequently growth, within the resin material, of an array of carbon nanotubes occurs, as well as the formation of the composite material.
摘要:
A system that receives nanomaterials, forms nanofibrous materials therefrom, and collects these nanofibrous materials for subsequent applications. The system is coupled to a chamber that generates nanomaterials, typically carbon nanotubes produced from chemical vapor deposition, and includes a mechanism for spinning the nanotubes into yarns or tows. Alternatively, the system includes a mechanism for forming non-woven sheets from the nanotubes. The system also includes components for collecting the formed nanofibrous materials. Methods for forming and collecting the nanofibrous materials are also provided.
摘要:
A thermoelectric device that can exhibit substantially high specific power density is provided. The device includes core having a p-type element made from carbon nanotube and an n-type element. The device also includes a heat plate in and a cool plate, between which the core can be positioned. The design of the thermoelectric device allows the device to operate at substantially high temperature and to generate substantially high power output, despite being light weight. A method for making the thermoelectric device is also provided.
摘要:
A ferromagnetic powder comprising ferromagnetic particles coated with a material that does not degrade at temperatures above 150° C and permits adjacent particles to strongly bind together after compaction such that parts made from the ferromagnetic powder have a transverse rupture strength of about 8,000 to about 20,000 pounds/square inch before sintering. The coating includes from 2 to 4 parts of an oxide and one part of a chromate, molybdate, oxalate, phosphate, or tungstate. The coating may be substantially free of organic materials. The invention also includes a method of making the ferromagnetic powder, a method of making soft magnetic parts from the ferromagnetic powder, and soft magnetic parts made from the ferromagnetic powder.
摘要:
An apparatus and method are provided for coating particles in a rotating container. A cathode forms an electrically conductive inner surface of a side wall of the container. An anode is positioned relative to the cathode so as to permit both the cathode and the anode to be immersed together in an electrically conductive fluid. A motor is connected to the container and arranged to cause the container to rotate so as to generate a centrifugal force. Particles are placed in the container, the container is filled with the electrically conductive fluid, and electrical current is caused to pass from the cathode to the anode through the electrically conductive fluid while the container is rotated. The particles rest against the electrically conductive inner surface of the side wall of the container while the electrical current passes from the cathode to the anode, so as to result in deposition of a coating material from the electrically conductive fluid onto the particles.