Source: http://www.google.com/patents/US7887689?dq=oakley+D523,461
Timestamp: 2016-05-29 21:55:25
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Matched Legal Cases: ['Application No. 02827708', 'Application No. 02827708', 'Application No. 2003', 'Application No. 10', 'Application No. 2005', 'Application No. 200480025996', 'Application No. 200610074754', 'Application No. 2005', 'Application No. 2006', 'Application No. 02827708', 'Application No. 10', 'Application No. 10', 'Application No. 2003', 'Application No. 200380109509', 'Application No. 02827708', 'Application No. 200480025996', 'Application No. 02827708']

Patent US7887689 - Method and apparatus for attaching nanostructure-containing material onto a ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA method for attaching nanostructure-containing material onto a sharp tip of an object includes forming a suspension of pre-formed nanostructure-containing material in a liquid medium. An electrode is immersed in the suspension. The sharp tip of the object is arranged to be in contact with the suspension....http://www.google.com/patents/US7887689?utm_source=gb-gplus-sharePatent US7887689 - Method and apparatus for attaching nanostructure-containing material onto a sharp tip of an object and related articlesAdvanced Patent SearchPublication numberUS7887689 B2Publication typeGrantApplication numberUS 10/842,357Publication dateFeb 15, 2011Priority dateNov 30, 2001Fee statusPaidAlso published asCA2468685A1, CN1617954A, EP1474836A2, EP1474836A4, US7252749, US8002958, US20030102222, US20050133372, US20080006534, US20080099339, WO2003075372A2, WO2003075372A3Publication number10842357, 842357, US 7887689 B2, US 7887689B2, US-B2-7887689, US7887689 B2, US7887689B2InventorsOtto Z. Zhou, Bo Gao, Guozhen Yue, Soojin OhOriginal AssigneeThe University Of North Carolina At Chapel Hill, Xintek, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (76), Non-Patent Citations (69), Referenced by (2), Classifications (17), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetMethod and apparatus for attaching nanostructure-containing material onto a sharp tip of an object and related articles
Carbon nanotubes have been grown directly upon substrates by use of chemical vapor deposition (CVD) techniques. However, such techniques require relatively high temperatures (e.g. −600-1,000� C.) as well as reactive environments in order to effectively grow the nanotubes. The requirement for such harsh environmental conditions severely limits the types of substrate materials which can be utilized. In addition, the CVD technique often results in multi-wall carbon nanotubes. These multi-wall carbon nanotubes generally do not have the same level of structural perfection and thus have inferior electronic emission properties when compared with single-walled carbon nanotubes.
Next, the raw carbon nanotube-containing material is subjected to purification. A number of techniques for purifying the raw materials are envisioned. According to one preferred embodiment, the raw material can be purified by reflux in a suitable solvent, such as a combination of peroxide (H2O2) and water, with an H2O2 concentration of 1-40% by volume, preferably about 20% by volume H2O2, with subsequent rinsing in CS2 and then in methanol, followed by filtration. According to an exemplary technique, approximately 10-100 ml of peroxide is introduced into the medium for every 1-10 mg of nanotubes in the medium, and the reflux reaction is carried out at a temperature of 20-100� C. (see, e.g. —U.S. Pat. No. 6,553,096).
The purified raw material, regardless of whether subjected to the above-described shortening process, can also optionally be annealed at a suitable temperature, such as 100� C.-1200� C. According to a preferred embodiment, the annealing temperature is 100� C.-600� C. The material is annealed for a suitable time period, such as approximately 1 to 60 minutes. According to a preferred embodiment, the material is annealed for approximately 1 hour. The material is annealed in a vacuum of about 10−2 Torr, or at an even higher vacuum pressure. According to a preferred embodiment, the vacuum is about 5�10−7 torr.
FIG. 3B is a SEM image of a coating of single-walled carbon nanotube bundles deposited by electrophoretic deposition in the manner described above. However, the nanotubes were subjected to a previously described process to shorten their length (e.g. —to about a 0.5 μm average bundle length). The film depicted in FIG. 3 was densified by sintering in vacuum at a suitable temperature (e.g. −800� C.). This coating comprises distinct grain boundaries with densely packed grains. Individual single-walled carbon nanotube bundles are no longer discernable.
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