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Langmuir 2002, 18, 4926 4932
Intercalation of Organic Ammonium Ions into Layered
Graphite Oxide

Materials. The starting material, GO, was synthesized from
natural graphite by the Staudenmaiermethod.
The pHtitration towardNa ionswas obtained in (0.1MNaCl NaOH) solutions
with different NaOH concentrations at 25 ¡ãC. The ion-exchange
capacity was evaluated from the titration curve.
The pH titration curve of GO toward Na ions is given
inFigure 2.The total exchange capacity ofGOis evaluated
as 4.4 mmol/g from the ion-exchange reaction in a 0.1 M
NaOH solution. The titration curve shows a multi-base
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