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Highly Efficient Method for Preparing Homogeneous and Stable Colloids Containing Graphene Oxide

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ABSTRACT

Phase transfer method has been developed for preparing homogeneous and stable graphene oxide colloids. Graphene oxide nanosheets (GONs) were successfully transferred from water to n-octane after modification by oleylamine. Corrugation and scrolling exist dominantly in the modified GONs. GONs were single layered with the maximum solubility in n-octane up to 3.82 mg mL-1. Oleylamine molecules chemically attach onto the GONs. Compared with traditional strategies, the phase transfer method has the features of simplicity and high efficiency.

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Linearization curves of Ozawa method and Kissinger method.
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Figure 5: Linearization curves of Ozawa method and Kissinger method.

Mentions: In order to further investigate the interaction of GONs and oleylamine, the decomposition activation energy of GONs-OA was investigated through the thermo-gravimetric analysis under nitrogen atmosphere with the heating rate 5, 10, 20, 30, and 40 K min-1. The derivative thermogravimetric plots of GONs-OA at different heating rate are shown in Figure 4. The linearization equations of Ozawa method and Kissinger method are y = -29.64817 × 103x + 44.91489 (R2 = 0.997) and y = -28.24605 × 103x + 29.80937 (R2 = 0.997), respectively (Figure 5). The decomposition activation energy calculated through Ozawa and Kissinger methods are 234.31 and 234.84 kJ mol-1, respectively. The decomposition activation energy is large, also demonstrating the strong interaction between oleylamine and GONs.


Highly Efficient Method for Preparing Homogeneous and Stable Colloids Containing Graphene Oxide
Linearization curves of Ozawa method and Kissinger method.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211982&req=5

Figure 5: Linearization curves of Ozawa method and Kissinger method.
Mentions: In order to further investigate the interaction of GONs and oleylamine, the decomposition activation energy of GONs-OA was investigated through the thermo-gravimetric analysis under nitrogen atmosphere with the heating rate 5, 10, 20, 30, and 40 K min-1. The derivative thermogravimetric plots of GONs-OA at different heating rate are shown in Figure 4. The linearization equations of Ozawa method and Kissinger method are y = -29.64817 × 103x + 44.91489 (R2 = 0.997) and y = -28.24605 × 103x + 29.80937 (R2 = 0.997), respectively (Figure 5). The decomposition activation energy calculated through Ozawa and Kissinger methods are 234.31 and 234.84 kJ mol-1, respectively. The decomposition activation energy is large, also demonstrating the strong interaction between oleylamine and GONs.

View Article: PubMed Central - HTML - PubMed

ABSTRACT

Phase transfer method has been developed for preparing homogeneous and stable graphene oxide colloids. Graphene oxide nanosheets (GONs) were successfully transferred from water to n-octane after modification by oleylamine. Corrugation and scrolling exist dominantly in the modified GONs. GONs were single layered with the maximum solubility in n-octane up to 3.82 mg mL-1. Oleylamine molecules chemically attach onto the GONs. Compared with traditional strategies, the phase transfer method has the features of simplicity and high efficiency.

No MeSH data available.