Cleavage and size reduction of graphite crystal using ultrasound radiation
PBN-AR
Instytucja
Instytut Fizyki Molekularnej Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
en
Czasopismo
CARBON
ISSN
0008-6223
EISSN
Wydawca
PERGAMON-ELSEVIER SCIENCE LTD
DOI
URL
Rok publikacji
2013
Numer zeszytu
Strony od-do
53-61
Numer tomu
55
Link do pełnego tekstu
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Autorzy
(liczba autorów: 6)
Pozostali autorzy
+ 4
Streszczenia
Język
en
Treść
The influence of ultrasound radiation on graphite structure was studied by laser light scattering, X-ray diffraction, Raman spectroscopy and Transmission Electron Microscopy. Irradiations of polycrystalline graphite powder suspensions at frequencies of 20 kHz and 500 kHz, were carried out in three different solvents: water (as the best medium for cavitation), a surfactant (OMImBr) aqueous solution and also a mixture of sulfuric and nitric acids which caused the exfoliation by intercalation. The average basal particle size of 168 mu m was reduced to 4 mu m after ultrasonication delivering a huge energy density up to 1.2 MW/m(2). Change of the sonication time and the nature of the solvents produced different reduction of the graphite crystals dimensions, affecting the out of plane thickness and the basal width as well. The ultrasonication promoted the disordering of the graphite tridimensional stacking for all solvents used, with the strongest effect in acidic medium. Turbostratic structures formation and exfoliation of graphene flakes have been observed after the use of surfactant for sonication medium. Intercalation in acid medium prior to the ultrasound treatment produced similar effects. (C) 2012 Elsevier Ltd. All rights reserved.
Cechy publikacji
ORIGINAL_ARTICLE
Inne
System-identifier
607163
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