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Preparation and examination of multilayer graphene nanosheets by exfoliation of graphite in high efficient attritor mill

100%

Kun P., Wéber F., Balázsi C.

Open Chemistry

2011

vol. 9

issue 1

47-51

Graphene multilayers have been prepared by mechanical method based on milling graphite in high efficient attritor mill. The results showed that the best dispersion media is ethanol, and 10 hours of intensive milling proved to be the most efficient way to separate the graphite layers as it was shown by scanning electron microscopy and X-ray diffraction measurements. [...]

Low pressure RF plasma modification of the surface of three different nano-carbon materials

88%

Bertóti I., Mohai M., Balázsi C., László K., Szépvölgyi J.

Open Chemistry

2015

vol. 13

issue 1

Well-ordered nano-carbon materials, like multi-wall carbon nanotubes, graphene oxide, graphene due to their unique physical and chemical properties, are candidates for promising applications. In this work thin multilayered graphene, single layer graphene oxide layers and highly oriented pyrolytic graphite (HOPG) surface were treated by RF activated N2 gas plasma at nominally room temperature. Negative bias in the 0–200 V range and treatment time of 10 min was applied. Surface chemical alterations were followed by X-ray photoelectron spectroscopy (XPS). The applied treatments resulted in a significant build-up of nitrogen in the surface of these nano-carbon materials. The amount of nitrogen varied between 4 and 10 atomic %, depending on type of carbon and on biasing conditions. Evaluating the high-resolution N1s XP spectral region, typically three different chemical bonding states of the nitrogen were delineated. Peak component at 398.3 eV is assigned to C=N–C type, at 399.7 eV to sp2 N in melamine-type ring structure and at 400.9 eV to N substituting carbon in a graphite-like environment. Identical chemical bonding of the nitrogen was detected on the surface of HOPG treated in the same way for comparison.

Nano-hydroxyapatite preparation from biogenic raw materials

64%

Gergely G., Wéber F., Lukács I., Illés L., Tóth A., Horváth Z., Mihály J., Balázsi C.

Open Chemistry

2010

vol. 8

issue 2

375-381

Hydroxyapatite (HAp) was successfully produced from recycled eggshell, seashell and phosphoric acid. The phases obtained depended on the ratio of calcined eggshell/ seashell to phosphoric acid, the calcination temperature and the mechanochemical activation method (ball milling or attrition milling). The HAp structures were characterized by X-ray diffraction, scanning electron microsopy and infrared spectroscopy. Attrition milling was more effective than ball milling, yielding nanosize, homogenous and pure Hap. [...]

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3 Open Chemistry

1 2014

1 2011

1 2010

3 Balázsi C.

2 Wéber F.

1 Bertóti I.

1 Gergely G.

1 Horváth Z.

1 Illés L.

1 Kun P.

1 Lukács I.

1 László K.

1 Mihály J.

1 Mohai M.

1 Szépvölgyi J.

1 Tóth A.

Search results

Preparation and examination of multilayer graphene nanosheets by exfoliation of graphite in high efficient attritor mill

Low pressure RF plasma modification of the surface of three different nano-carbon materials

Nano-hydroxyapatite preparation from biogenic raw materials