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    Method for low temperature synthesis of single wall carbon nanotubes
    1.
    发明授权
    Method for low temperature synthesis of single wall carbon nanotubes 失效
    单壁碳纳米管的低温合成方法

    公开(公告)号：US07338648B2

    公开(公告)日：2008-03-04

    申请号：US10326276

    申请日：2002-12-23

    申请人： Avetik Harutyunyan ,  Bhabendra K. Pradhan ,  Peter C. Eklund

    发明人： Avetik Harutyunyan ,  Bhabendra K. Pradhan ,  Peter C. Eklund

    IPC分类号： B82B3/00

    CPC分类号： B82Y30/00 ,  B82Y40/00 ,  C01B32/162 ,  C01B2202/02 ,  D01F9/1272 ,  Y10S977/843

    摘要： The present invention is directed towards a method of producing single wall carbon nanotubes which comprises providing a catalyst comprising an alumina support and a component selected from the group consisting of reduced Fe, reduced Fe/Mo, Fe oxide, and Fe/Mo oxide, and growing, in an inert atmosphere, single wall carbon nanotubes by passing a gas comprising methane over the catalyst at a temperature and for a time sufficient to grow single wall carbon nanotubes. The invention is also directed towards a single wall carbon nanotube produced by such a method. The invention is also directed towards a catalyst for producing SWNTs, wherein the catalyst comprises an alumina support and a component selected from the group consisting of reduced Fe, reduced Fe/Mo, Fe oxide, and Fe/Mo oxide.

    摘要翻译： 本发明涉及一种制备单壁碳纳米管的方法，其包括提供包含氧化铝载体和选自还原Fe，还原Fe / Mo，Fe氧化物和Fe / Mo氧化物的组分的催化剂，以及 在惰性气氛中通过在包含甲烷的气体在催化剂上经过足以使单壁碳纳米管生长的温度和时间内使单壁碳纳米管生长。 本发明还涉及通过这种方法制备的单壁碳纳米管。 本发明还涉及用于制备SWNT的催化剂，其中催化剂包含氧化铝载体和选自还原Fe，还原Fe / Mo，Fe氧化物和Fe / Mo氧化物的组分。

    Method of purifying nanotubes and nanofibers using electromagnetic radiation
    3.
    发明授权
    Method of purifying nanotubes and nanofibers using electromagnetic radiation 失效

    公开(公告)号：US07014737B2

    公开(公告)日：2006-03-21

    申请号：US10174477

    申请日：2002-06-17

    申请人： Avetik Harutyunyan ,  Bhabendra K. Pradhan ,  Peter C. Eklund

    发明人： Avetik Harutyunyan ,  Bhabendra K. Pradhan ,  Peter C. Eklund

    IPC分类号： D01F9/12

    CPC分类号： B82Y30/00 ,  B82Y40/00 ,  C01B32/17 ,  C01B2202/02 ,  Y10S977/845

    摘要： Disclosed are methods of purifying mixtures comprising nanofibers and/or nanotubes and residual catalyst particles that are covered by outer layers of the nanotube or nanofiber material. The mixtures are exposed to electromagnetic radiation, which induces localized heating in the residual catalyst particles. The localized heating creates breaches in the outer layers. Thereafter, the residual catalyst particles may be removed under relatively mild conditions that do not significantly affect the structural integrity of the nanotubes or nanofibers. The methods of the invention have been used to particular advantage in the purification of single wall carbon nanotubes (SWNTs) synthesized using metal catalysts. For these SWNTs, microwave radiation is preferably used to induce the localized heating, the outer layers are preferably removed at least in part by carrying out the localized heating under air, and the residual catalyst may be removed by exposure to relatively dilute aqueous acid.

    Purification of carbon filaments and their use in storing hydrogen
    4.
    发明授权
    Purification of carbon filaments and their use in storing hydrogen 失效
    碳丝的净化及其在储存氢气中的应用

    公开(公告)号：US06869583B2

    公开(公告)日：2005-03-22

    申请号：US10120827

    申请日：2002-04-12

    申请人： Avetik Harutyunyan ,  Bhabendra Pradhan ,  Peter C. Eklund ,  Yoshiya Fujiwara ,  Hajime Goto

    发明人： Avetik Harutyunyan ,  Bhabendra Pradhan ,  Peter C. Eklund ,  Yoshiya Fujiwara ,  Hajime Goto

    IPC分类号： C01B3/00 ,  C01B31/02 ,  D01F9/12 ,  D01F9/127

    CPC分类号： B82Y30/00 ,  B82Y40/00 ,  C01B3/001 ,  C01B3/0021 ,  C01B32/17 ,  C01B2202/02 ,  D01F9/12 ,  Y02E60/325 ,  Y02E60/327 ,  Y10S977/848

    摘要： Carbon structures, e.g. carbon nano-fibers, suitable for absorbing hydrogen at low pressures and low temperatures are produced by a selective oxidation and/or acid reflux process. The process includes heating an impure mixture containing a crystalline form of carbon in the presence of an oxidizing gas at a temperature and time sufficient to selectively oxidize and remove a substantial amount of any amorphous carbon impurities from the mixture. Metal containing impurities can be removed from the mixture by exposing the desired carbon and accompanying impurities to an acid to produce a carbon fiber that is substantially free of both non-fiber carbon impurities and metal impurities. Another aspect of the present invention includes purified carbon structures that can store hydrogen at low pressures and temperatures.

    摘要翻译： 碳结构，例如 通过选择性氧化和/或酸回流过程产生适合于在低压和低温下吸收氢的碳纳米纤维。 该方法包括在氧化气体存在下加热含有结晶形式的不纯的混合物，该温度和时间足以选择性氧化和从混合物中除去大量的任何无定形碳杂质。 通过将所需的碳和伴随的杂质暴露于酸中以产生基本上不含非纤维碳杂质和金属杂质的碳纤维，可以从混合物中除去含金属杂质。 本发明的另一方面包括可以在低压和低温下储存氢的纯化碳结构。

    Catalyst for the Growth of Carbon Single-Walled Nanotubes
    7.
    发明申请
    Catalyst for the Growth of Carbon Single-Walled Nanotubes 有权
    碳单壁纳米管生长催化剂

    公开(公告)号：US20070281087A1

    公开(公告)日：2007-12-06

    申请号：US11669128

    申请日：2007-01-30

    申请人： Avetik Harutyunyan ,  Toshio Tokune ,  Elena Mora

    发明人： Avetik Harutyunyan ,  Toshio Tokune ,  Elena Mora

    IPC分类号： C23C16/26

    CPC分类号： B01J35/0013 ,  B01J21/185 ,  B01J23/28 ,  B01J23/44 ,  B01J23/74 ,  B01J37/0211 ,  B01J37/343 ,  B82Y30/00 ,  B82Y40/00 ,  C01B32/162 ,  C01B2202/02 ,  Y10S977/843

    摘要： Methods and processes for synthesizing single-wall carbon nanotubes are provided. A carbon precursor gas is contacted with metal catalysts deposited on a support material. The metal catalysts are preferably nanoparticles having diameters less than about 3 nm. The reaction temperature is selected such that it is near the eutectic point of the mixture of metal catalyst particles and carbon. Further, the rate at which hydrocarbons are fed into the reactor is equivalent to the rate at which the hydrocarbons react for given synthesis temperature. The methods produce carbon single-walled nanotubes having longer lengths.

    摘要翻译： 提供了合成单壁碳纳米管的方法和方法。 碳前体气体与沉积在载体材料上的金属催化剂接触。 金属催化剂优选直径小于约3nm的纳米颗粒。 选择反应温度使其接近金属催化剂颗粒和碳的混合物的共晶点。 此外，烃进料到反应器中的速率等于烃在给定合成温度下反应的速率。 该方法产生长度较长的碳单壁碳纳米管。

    Synthesis of small diameter single-walled carbon nanotubes
    9.
    发明申请
    Synthesis of small diameter single-walled carbon nanotubes 有权
    小直径单壁碳纳米管的合成

    公开(公告)号：US20070116632A1

    公开(公告)日：2007-05-24

    申请号：US11418898

    申请日：2006-05-04

    申请人： Avetik Harutyunyan

    发明人： Avetik Harutyunyan

    IPC分类号： D01F9/12

    CPC分类号： D01F9/1272 ,  B82Y30/00

    摘要： Methods, processes, and apparatuses for the large scale synthesis of single-walled carbon nanotubes having small diameters are provided. Metal catalysts having small diameter and narrow distribution of particle sizes are prepared and continuously injected as aerosols into a reactor. The metal catalysts are supported on supports that are substantially free of carbon, and the reactor is configured to control the flow of the gases such that the reaction time and contact of the reactants with the reactor walls can be controlled. Single-walled carbon nanotubes can be continuously synthesized at a large scale and with high yields, and with small diameters and with narrow diameter ranges.

    摘要翻译： 提供了用于大规模合成具有小直径的单壁碳纳米管的方法，工艺和装置。 制备具有小直径和窄粒度分布的金属催化剂，并将其作为气溶胶连续注入反应器。 金属催化剂负载在基本上不含碳的载体上，并且反应器构造成控制气体的流动，从而可以控制反应物与反应器壁的反应时间和接触。 单壁碳纳米管可以大规模，高产率，小直径和窄径范围连续合成。

    Dry powder injector
    10.
    发明授权
    Dry powder injector 有权

    公开(公告)号：US07134618B2

    公开(公告)日：2006-11-14

    申请号：US10727706

    申请日：2003-12-03

    申请人： Avetik Harutyunyan ,  Shoji Isobe

    发明人： Avetik Harutyunyan ,  Shoji Isobe

    IPC分类号： B05B7/14

    CPC分类号： B05B7/1404 ,  B05B7/1445 ,  B05B7/1472 ,  B82Y30/00

    摘要： Methods, processes, and apparatuses for the large scale synthesis of carbon nanostructures are provided. Metal catalysts having small diameter and narrow distribution of particle sizes are prepared and continuously injected as aerosols into a reactor. The metal catalysts are supported on supports that are substantially free of carbon. The metal catalyst, in the form of a powder, is placed in an injector that is shaken vertically. The powder is aerosolized, and the powder entrailed in the gas is passed through a conduit that is bifurcated where one portion delivers the powder to the reactor while the other portion connects back to the ejector that is located in between the gas source and the top part of the container.