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Title: Method of producing exfoliated graphite, flexible graphite, and nano-scaled graphene platelets

Abstract

The present invention provides a method of exfoliating a layered material (e.g., graphite and graphite oxide) to produce nano-scaled platelets having a thickness smaller than 100 nm, typically smaller than 10 nm. The method comprises (a) dispersing particles of graphite, graphite oxide, or a non-graphite laminar compound in a liquid medium containing therein a surfactant or dispersing agent to obtain a stable suspension or slurry; and (b) exposing the suspension or slurry to ultrasonic waves at an energy level for a sufficient length of time to produce separated nano-scaled platelets. The nano-scaled platelets are candidate reinforcement fillers for polymer nanocomposites. Nano-scaled graphene platelets are much lower-cost alternatives to carbon nano-tubes or carbon nano-fibers.

Inventors:
 [1];  [2];  [1];  [1]
  1. (Centerville, OH)
  2. (Columbus, OH)
Publication Date:
Research Org.:
Nanotek Instruments, Inc. (Dayton, OH)
Sponsoring Org.:
USDOE
OSTI Identifier:
1017459
Patent Number(s):
7,824,651
Application Number:
11/800,728
Assignee:
Nanotek Instruments, Inc. (Dayton, OH) OSTI
Resource Type:
Patent
Country of Publication:
United States
Language:
English

Citation Formats

Zhamu, Aruna, Shi, Jinjun, Guo, Jiusheng, and Jang, Bor Z. Method of producing exfoliated graphite, flexible graphite, and nano-scaled graphene platelets. United States: N. p., 2010. Web.
Zhamu, Aruna, Shi, Jinjun, Guo, Jiusheng, & Jang, Bor Z. Method of producing exfoliated graphite, flexible graphite, and nano-scaled graphene platelets. United States.
Zhamu, Aruna, Shi, Jinjun, Guo, Jiusheng, and Jang, Bor Z. Tue . "Method of producing exfoliated graphite, flexible graphite, and nano-scaled graphene platelets". United States. https://www.osti.gov/servlets/purl/1017459.
@article{osti_1017459,
title = {Method of producing exfoliated graphite, flexible graphite, and nano-scaled graphene platelets},
author = {Zhamu, Aruna and Shi, Jinjun and Guo, Jiusheng and Jang, Bor Z.},
abstractNote = {The present invention provides a method of exfoliating a layered material (e.g., graphite and graphite oxide) to produce nano-scaled platelets having a thickness smaller than 100 nm, typically smaller than 10 nm. The method comprises (a) dispersing particles of graphite, graphite oxide, or a non-graphite laminar compound in a liquid medium containing therein a surfactant or dispersing agent to obtain a stable suspension or slurry; and (b) exposing the suspension or slurry to ultrasonic waves at an energy level for a sufficient length of time to produce separated nano-scaled platelets. The nano-scaled platelets are candidate reinforcement fillers for polymer nanocomposites. Nano-scaled graphene platelets are much lower-cost alternatives to carbon nano-tubes or carbon nano-fibers.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {11}
}

Patent:

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