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Superhydrophilic graphite surfaces and water-dispersible graphite colloids by electrochemical exfoliation
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10.1063/1.4817680
/content/aip/journal/jcp/139/6/10.1063/1.4817680
http://aip.metastore.ingenta.com/content/aip/journal/jcp/139/6/10.1063/1.4817680
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) The photos of the sulfuric acid solution before and after electrolysis. (b) The photos of the two graphite electrodes after electrolysis.

Image of FIG. 2.
FIG. 2.

The changes of the wettability (a) and surface roughness (b) on graphite electrodes after electrolytic exfoliation.

Image of FIG. 3.
FIG. 3.

The variation of contact angle and weight of the anodic graphite with the number of peeling times.

Image of FIG. 4.
FIG. 4.

The I-V curves of anodic graphite after various treatments, including electrolysis and peeling.

Image of FIG. 5.
FIG. 5.

The chemical composition analysis of graphite sheets by X-ray photoelectron spectroscopy.

Image of FIG. 6.
FIG. 6.

(a) The time variation of contact angles of anodic and cathodic electrodes during electrolysis. The electrolytic current is fixed at 100 mA. (b) The variation of contact angles with electrolytic current for 10 min electrolysis.

Image of FIG. 7.
FIG. 7.

The influence of electrolytic current on the surface roughness of anodic graphite after 10 min electrolysis.

Image of FIG. 8.
FIG. 8.

(a) Graphite particles obtained by electrolytic exfoliation can be well dispersed in deionized water but they settle by salt addition due to the electrostatic screening effect. (b) The zeta potential and size of exfoliated graphite nanoparticles. The mean zeta potential is −51 mV and mean size is 154 nm.

Image of FIG. 9.
FIG. 9.

(a) UV-visible spectra of suspensions of purchased graphite flakes, graphite oxide, and exfoliated nanoparticles obtained from electrolysis in sulfuric acid solution. (b) TGA curves of graphite flakes, graphite oxide, and exfoliated particles obtained from electrolysis in sulfuric acid solution. (c) Raman spectra of graphite flakes, graphite oxide, and exfoliated particles.

Image of FIG. 10.
FIG. 10.

(a) UV-vis spectrum of exfoliated particles obtained from acidic, neutral, and basic electrolytic solution. (b) Raman spectra of exfoliated particles obtained from acidic, neutral, and basic electrolytic solution. (c) TGA curves of exfoliated particles obtained from acidic, neutral, and basic electrolytic solution.

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/content/aip/journal/jcp/139/6/10.1063/1.4817680
2013-08-12
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Superhydrophilic graphite surfaces and water-dispersible graphite colloids by electrochemical exfoliation
http://aip.metastore.ingenta.com/content/aip/journal/jcp/139/6/10.1063/1.4817680
10.1063/1.4817680
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