US2017210626A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2017210626-A1 |
| Application number | US-201715483614-A |
| Country | US |
| Kind code | A1 |
| Filing date | Apr 10, 2017 |
| Priority date | Feb 12, 2010 |
| Publication date | Jul 27, 2017 |
| Grant date | — |
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A method for controlling density, porosity and/or gap size within a nanotube fabric layer is disclosed. In one aspect, this can be accomplished by controlling the degree of rafting in a nanotube fabric. In one aspect, the method includes adjusting the concentration of individual nanotube elements dispersed in a nanotube application solution. A high concentration of individual nanotube elements will tend to promote rafting in a nanotube fabric layer formed using such a nanotube application solution, whereas a lower concentration will tend to discourage rafting. In another aspect, the method includes adjusting the concentration of ionic particles dispersed in a nanotube application solution. A low concentration of ionic particles will tend to promote rafting in a nanotube fabric layer formed using such a nanotube application solution, whereas a higher concentration will tend to discourage rafting. In other aspects, both concentration parameters are adjusted.
Opening claim text (preview).
What is claimed is: 1 . A low porosity nanotube fabric article, comprising: at least one nanotube fabric layer, each of said at least one nanotube fabric layers comprising a plurality of nanotubes; wherein at least a portion of said nanotubes within each of said at least one nanotube fabric layers are rafted; and wherein each of said at least one nanotube fabric layers is substantially free of voids larger than a preselected size. 2 . The low porosity nanotube fabric article of claim 1 wherein said preselected size is within the range of 10 nanometers to 50 nanometers. 3 . The low porosity nanotube fabric article of claim 1 wherein at least 10% of said nanotubes within each of said at least one nanotube fabric layers are rafted. 4 . The low porosity nanotube fabric article of claim 1 wherein at least 20% of said nanotubes within each of said at least one nanotube fabric layers are rafted. 5 . The low porosity nanotube fabric article of claim 1 wherein at least 30% of said nanotubes within each of said at least one nanotube fabric layers are rafted. 6 . The low porosity nanotube fabric article of claim 1 wherein at least 40% of said nanotubes within each of said at least one nanotube fabric layers are rafted. 7 . The low porosity nanotube fabric article of claim 1 wherein said preselected size is selected to provide a desired sheet resistance within said nanotube fabric article. 8 . The low porosity nanotube fabric article of claim 7 wherein said sheet resistance is within the range of 1 k-Ohm/square to 1 M-Ohm/square. 9 . The low porosity nanotube fabric article of claim 7 wherein said sheet resistance is within the range of 10 k-Ohm/square to 100 k-Ohm/square 10 . The low porosity nanotube fabric article of claim 1 where said at least one nanotube fabric layer further comprises ionic organic species, ionic polymers, inorganic salts, or mixtures thereof. 11 . The low porosity nanotube fabric article of claim 10 wherein said inorganic salts include silica. 12 . The low porosity nanotube fabric article of claim 1 wherein said at least one nanotube fabric layer further comprises at least one additional carbon allotrope. 13 . The low porosity nanotube fabric article of claim 12 wherein said at least one additional carbon allotrope includes amorphous carbon. 14 . The low porosity nanotube fabric article of claim 1 wherein said nanotubes are carbon nanotubes. 15 . The low porosity nanotube fabric article of claim 14 wherein said carbon nanotubes include single walled nanotubes. 16 . The low porosity nanotube fabric article of claim 14 wherein said carbon nanotubes include multi walled nanotubes. 17 . The low porosity nanotube fabric article of claim 14 wherein said carbon nanotubes are a mixture of single walled nanotubes and multi walled nanotubes. 18 . The low porosity nanotube fabric article of claim 14 wherein a first nanotube fabric layer is comprised of a first type of carbon nanotube and a second nanotube fabric layer is comprised of a second type of carbon nanotube. 19 . The low porosity nanotube fabric article of claim 14 wherein said carbon nanotubes are functionalized carbon nanotubes. 20 . The low porosity nanotube fabric article of claim 1 wherein said nanotubes are solution deposited nanotubes. 21 . The low porosity nanotube fabric article of claim 1 wherein said nanotubes are of a uniform length. 22 . The low porosity nanotube fabric article of claim 1 wherein said nanotubes have a selected distribution of lengths.
single-walled · CPC title
with the aid of dispersing agents for the polymer · CPC title
Manufacture or treatment of nanostructures by manipulation of individual atoms or molecules, or limited collections of atoms or molecules as discrete units · CPC title
Diameter · CPC title
using fullerenes, e.g. C60, or nanotubes, e.g. carbon or silicon nanotubes · CPC title
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