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Aqueous carbon nanotube applicator liquids and methods for producing applicator liquids thereof

  • US 8,771,628 B2
  • Filed: 11/04/2009
  • Issued: 07/08/2014
  • Est. Priority Date: 12/16/2004
  • Status: Active Grant
First Claim
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1. A method for making an applicator liquid, the method comprising:

  • purifying a plurality of nanotubes to obtain purified nanotubes, wherein said step of purifying is accomplished by;

    contacting said plurality of nanotubes with an acid to create a nanotube-acid solution and dissolve metal impurities,separating the dissolved metal impurities from said nanotube-acid solution to obtain said purified nanotubes in said nanotube-acid solution, andcontacting said plurality of nanotubes in the nanotube-acid solution with a base to return the pH level of the nanotube-acid solution to approximately neutral to obtain purified nanotubes; and

    contacting said purified nanotubes with water;

    whereinsaid applicator liquid contains said purified nanotubes distributed in said water without substantial precipitation for at least one hour after said contacting;

    said applicator liquid is free of polymers and surfactants; and

    said applicator liquid has a group I metal impurities content of less than 100 ppb.

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