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Carbon nanotubes having a bimodal size distribution

A technology of carbon nanotubes and multi-walled carbon nanotubes, applied in the direction of carbon nanotubes, nanocarbons, nanotechnology, etc., can solve a lot of cost problems

Inactive Publication Date: 2015-01-14
SEERSTONE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Capturing and storing CO2 is costly in current practice

Method used

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  • Carbon nanotubes having a bimodal size distribution
  • Carbon nanotubes having a bimodal size distribution
  • Carbon nanotubes having a bimodal size distribution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0162] An example of the formation of a bimodal composition using the Bosch reaction or variants thereof. In one embodiment using apparatus suitable for preparing the disclosed carbon nanotube compositions, in a variation of the Bosch reaction, carbon dioxide is used and the reducing agent comprises methane, wherein the stoichiometric ratio is:

[0163] (equation 4)

[0164] This is an exothermic reaction in which an indeterminate amount of heat is released. Methane is generally cheap and readily available. Examples of bimodal compositions were prepared using reactive gases at near atmospheric pressure and processing temperatures between about 600°C and 950°C. Additional examples were prepared using a higher process pressure of 4.14 MPa at about 650°C to 950°C.

[0165] In some embodiments using apparatus suitable for making the disclosed subject carbon nanotube compositions, in the Bosch reaction, the reducing agent comprises hydrogen gas, wherein the stoichiome...

Embodiment 2

[0186] Example 2 - Sample 112

[0187]

[0188] For Example 2, the sample quartz disk was placed flat on a 304 stainless steel disc used as catalyst. A 304 stainless steel catalyst disc was placed in the tube furnace 1 near the centerline. The vacuum pump 5 was started and helium was used to purge the experimental apparatus for five minutes. After five minutes, the vacuum pump was turned off, the compressor 3 was turned on, the refrigerated condenser 4 was turned on, and the flow of helium gas continued until the pressure was 91.0 kPa (680 Torr), at which point the gas flow was turned off. Then turn on the furnace.

[0189] When the furnace 1 temperature reached the set point temperature of 680 °C, the vacuum pump 5 was turned on and the experimental apparatus 5 was purged with the reaction gas in a stoichiometric mixture of carbon dioxide and hydrogen from the gas supply 6 controlled by the mixing valve 7. minute. After five minutes, the vacuum pump was turned off. ...

Embodiment 5

[0201] Example 5 - Sample 55

[0202]

[0203] For Example 5, sample 55,0000 fine 316L stainless steel was used as catalyst. Steel wool is placed in Furnace 1. The steps of purging the furnace, introducing reaction gases at the experimental pressure and temperature, stopping the reaction, and purging and cooling the furnace were performed as outlined in Example 1 above. The reaction conditions are given in the diagram.

[0204] exist Figure 18 , Figure 19 and Figure 20 The resulting products are depicted at magnifications of 10,004X, 20,000X and 50,000X, respectively. At 10,004X magnification, the bimodal size distribution is not apparent. However, if Figure 19 and Figure 20 As indicated, at 20,000X magnification and even at 50,000X greater magnification, the secondary growth is visible and thus the bimodal nature is more pronounced.

[0205] Example 6 - Sample 62

[0206]

[0207] For Example 6, Sample 62, 316L stainless steel tube (40 gauge) was used...

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Abstract

A composition comprising a mixture of carbon nanotubes having a bi-modal size distribution are produced by reducing carbon oxides with a reducing agent in the presence of a catalyst. The resulting mixture of nanotubes include a primary population of multiwall carbon nanotubes having characteristic diameters greater than 40 nanometers, and a secondary population of what are apparently single wall nanotubes with characteristic diameters of less than 30 nanometers. The resulting mixture may also contain one or more other allotropes and morphologies of carbon in various proportions. The mixture of carbon nanotubes has specific apparently uncommon properties, including unusual resistivity and density

Description

[0001] priority statement [0002] This application claims the benefit of the filing date of US Provisional Patent Application Serial No. 61 / 637,229 "Carbon Nanotubes Having a Bimodal Size Distribution," filed April 23, 2012, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The disclosed embodiments generally relate to compositions composed of carbon nanotubes having a broad range of size distributions and having a substantially bimodal size distribution. The present disclosure further provides methods for producing bimodal compositions consisting essentially of two or more different carbon nanotube populations consisting of characteristically significantly larger carbon nanotubes (typically multi-walled carbon nanotubes), along with a secondary growth population consisting of characteristically much smaller nanotubes (usually single-walled carbon nanotubes). Background technique [0004] US Patent Publication No. 2012 / 00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82B1/00B82B3/00
CPCC01B2202/22C01P2004/53C01B2202/36B82Y40/00C01B31/0233C01P2006/11B82Y30/00C01B32/162C01B32/16
Inventor D·B·诺伊斯
Owner SEERSTONE