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zelatan

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ÒÔÏÂÊÇÕª×ÔACS Appl. Mater. InterfacesÖÐһƪÎÄÏ×
Preparation of Graphene Oxide and Its Exfoliated
Suspension. A modified Hummers method was utilized to
synthesize oxidized graphite powder (25). Typically, 2.5 g of
natural graphite, 2.5 g of NaNO3, and 7.5 g of KMnO4 were
slowly added to 50 mL of concentrated H2SO4 under vigorous
stirring below 5 ¡ãC. Then the mixture was stirred continuously
for 1 h at 35 ¡ãC to oxidize the graphite. After that, 100 mL water
was added into the mixture, and the temperature was increased
to higher than 90 ¡ãC, and the suspension was maintained at
95-100 ¡ãC for 15 min. Then, the mixture was poured into 300
mL of deionized water, after that 20 mL of H2O2 was added into
the suspension. After cooling to room temperature, the solid
products were filtered, subsequently washed with 5% HCl
aqueous solution and water, and finally dried to obtain graphite
oxide.
The obtained graphite oxide was dispersed in DMF (1.0 mg
mL-1) by ultrasonication treatment by using an ultrasonication
bath cleaner for 3 h. The resulting exfoliated GO suspension was
centrifuged at 2000 rpm for 5 min to remove the unexfoliated
graphite oxide particles.

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Originally posted by zelatan at 2010-12-12 11:38:11:
ÒÔÏÂÊÇÕª×ÔACS Appl. Mater. InterfacesÖÐһƪÎÄÏ×
Preparation of Graphene Oxide and Its Exfoliated
Suspension. A modified Hummers method was utilized to
synthesize oxidized graphite powder (25). T ...

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Originally posted by zelatan at 2010-12-12 11:38:11:
ÒÔÏÂÊÇÕª×ÔACS Appl. Mater. InterfacesÖÐһƪÎÄÏ×
Preparation of Graphene Oxide and Its Exfoliated
Suspension. A modified Hummers method was utilized to
synthesize oxidized graphite powder (25). T ...

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Originally posted by plain_j at 2010-12-12 19:51:59:

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