摘要:
A method of depositing silicon on carbon nanomaterials such as vapor grown carbon nanofibers, nanomats, or nanofiber powder is provided. The method includes flowing a silicon-containing precursor gas in contact with the carbon nanomaterial such that silicon is deposited on the exterior surface and within the hollow core of the carbon nanomaterials. A protective carbon coating may be deposited on the silicon-coated nanomaterials. The resulting nanocomposite materials may be used as anodes in lithium ion batteries.
摘要:
A method of modifying the surface of carbon materials such as vapor grown carbon nanofibers is provided in which silicon is deposited on vapor grown carbon nanofibers using a chemical vapor deposition process. The resulting silicon-carbon alloy may be used as an anode in a rechargeable lithium ion battery.
摘要:
A method of modifying the surface of carbon materials such as vapor grown carbon nanofibers is provided in which silicon is deposited on vapor grown carbon nanofibers using a chemical vapor deposition process. The resulting silicon-carbon alloy may be used as an anode in a rechargeable lithium ion battery.
摘要:
A process for fabricating a carbon composite structure that is lightweight, structurally sound, and characterized by high heat capacity. A carbon structure is devised with cavities therein receiving a phase change medium. The phase change medium demonstrates both high energy absorption capacity and high thermal conductivity and is formed from a carbon fiber to establish a high porosity medium having a large volume fraction. The surface energy of the carbon fibers is enhanced in various ways as by deposition of a carbide former, a metallurgical coating or a precursor liquid or by electroplating or etching the surfaces of the carbon fibers. The enhanced surface energy allows for the retention of phase change material.
摘要:
A folding stage includes a spacing linkage that is adjustable. The spacing linkage locks the folding stage at its final use position. The linkage includes an adjustable link member having an adjustment device. The adjustment device provides for changing the length of the link. The adjustment device includes a housing having a block slidably mounted therein. The housing and the block both include transverse openings for receiving a pivot bolt. The end of the housing receives a bolt threadably connected to the sliding block. A nut on the exterior of the housing threadably connects to the bolt and positions the block relative to the end of the housing for adjusting the length of the link and the position of the spacing linkage.
摘要:
Carbon fiber with increased bulk density comprising vapor grown carbon fiber is provided. The preferred method of increasing the carbon fiber bulk density comprises mixing a vapor grown carbon fiber with a diameter of less than about 1 .mu.m and an initial bulk density of less than about 0.2 lb/ft.sup.3 with an aqueous-based solution, blending the mixture under high shear conditions, and drying the blended mixture. Upon drying, the mixture forms a carbon fiber mass with an increased bulk density having a final bulk density of at least about 3 lb/ft.sup.3. The increased bulk density carbon fiber pellets are ideally suited for use as reinforcing materials in rubber, plastic and the like. Preferably, the aqueous-based solution is a latex containing solution and latex is deposited on the fibers.
摘要翻译:提供了包含气相生长碳纤维的具有增加的堆积密度的碳纤维。 增加碳纤维堆积密度的优选方法包括用水基溶液混合直径小于约1μm的初始堆积密度的小于或等于约0.2lb / ft 3的气相生长碳纤维,将混合物 在高剪切条件下干燥混合的混合物。 干燥后,混合物形成具有至少约3lb / ft 3的最终堆积密度的堆积密度增加的碳纤维块。 增加堆积密度的碳纤维颗粒理想地适合用作橡胶,塑料等中的增强材料。 优选地,水基溶液是含乳胶的溶液,并且胶乳沉积在纤维上。
摘要:
A method and apparatus are provided for separating carbon fibers from gaseous effluent which fibers have been formed in a continuous gas phase reaction. The apparatus is a collection chamber including top and bottom portions and including exit tubes attached to the bottom portion. Carbon fibers enter the top portion of the chamber from a reactor and are collected in the bottom portion where they are forced into the exit tubes by a piston and then collected in bundles. As the fibers are compressed into the tubes, they form an airtight seal which prevents air from entering the chamber and prevents gas from exiting the chamber. The remaining gaseous effluent may then be removed from the chamber and processed for reuse.
摘要:
A yarn control system and apparatus for use in the manufacture of non-woven, non-knitted fabrics which have a pile supported by a backing cloth, such as carpets, the apparatus including a plurality of needles for inserting yarns from yarn supplies into the backing cloth to provide a pile material and control means for controlling the amount of each yarn inserted by the needles to maintain constant pile height, the control means including a yarn compensating roller upstream of the needles and around which each yarn is entrained, and biassing means acting on the roller to maintain a constant tension in the yarns, the biassing means preferably comprising pneumatic piston and cylinder devices. The compensating roller may have a roughened surface and is preferably able to rotate in one direction only, but in an alternative construction, a driven guide roller which has a roughened surface is provided and the compensating roller has a smooth surface.
摘要:
A method of producing vapor grown carbon fibers is provided in which coal is utilized as a source of an iron catalyst, as a source of hydrocarbon and sulfur, or both. The method includes the steps of introducing pulverized coal into a furnace containing a gas selected from the group consisting of hydrogen, hydrocarbon, nitrogen, ammonia, helium, or mixtures thereof, and maintaining the gas at a temperature from about 1000.degree.-1175.degree. C. to form the fibers. The coal has a sulfur content of from 1 to 6% by weight and may comprise high volatile bituminous coal. The use of coal to produce vapor grown carbon fibers provides a significant cost advantage over other starting materials and also provides an environmentally safe use for high sulfur content coal.
摘要:
Aquatic plants are harvested from a body of water. The aquatic plants are gathered from the surface of the body of water and transported to a collection zone at a collection point on the body of water. The aquatic plants are then moved from the collection zone to an aquatic plant processing station.