Title:
NANODIAMOND DISPERSION LIQUID, AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2017/141689
Kind Code:
A1
Abstract:
Provided is a method for producing a high-purity single-digit nanodiamond dispersion liquid having only a very small amount of contaminant metal components, through a step for simply and efficiently removing fine metal powder mixed with the nanodiamond. The nanodiamond dispersion liquid production method according to the present invention is for obtaining a nanodiamond dispersion liquid which has a particle size D50 (median size) of 10 nm or less, and in which the total content of a Zr compound, an Al compound, an Y compound, an Fe compound, and a Hf compound (in terms of elemental Zr, Al, Y, Fe, and Hf; weight) is 50 ppm or less of nanodiamond contained in the dispersion liquid (weight), through step 1 for subjecting nanodiamond to a pulverization treatment using a pulverizer, step 2 for subjecting a mixture of the nanodiamond after the pulverization treatment and sulfuric acid to a heat treatment, and step 3 for removing sulfate radicals from the mixture after the heat treatment.
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Inventors:
KIMOTO NORIHIRO (JP)
YAMAMOTO YUKI (JP)
YAMAMOTO YUKI (JP)
Application Number:
PCT/JP2017/003320
Publication Date:
August 24, 2017
Filing Date:
January 31, 2017
Export Citation:
Assignee:
DAICEL CORP (JP)
International Classes:
C01B32/25; B02C19/00; C09K3/14
Domestic Patent References:
| WO2008096854A1 | 2008-08-14 |
Foreign References:
| JP2013056805A | 2013-03-28 | |||
| JP2004238256A | 2004-08-26 | |||
| JPH0925110A | 1997-01-28 |
Other References:
HIROSHI MAKITA: "Purification of ultrafine grain diamond and its evaluation", NEW DIAMOND, vol. 12, no. 3, July 1996 (1996-07-01), pages 8 - 13
Attorney, Agent or Firm:
GOTO & CO. (JP)
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