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Inexpensive, upscalable nanotube growth methods
Z.E. Horvath,K. Kertesz,L. Petho,A.A. Koos,L. Tapaszto,Z. Vertesy,Z. Osvath,Al. Darabont,P. Nemes-Incze,Zs. Ssrkozi,L.P. Bir? 한국물리학회 2006 Current Applied Physics Vol.6 No.2
Despite of the very promising foreseen applications, the use of carbon nanotubes in wider range is still limited by the high pro-duction costs. In this paper, our latest results concerning two inexpensive methods of carbon nanotube growth with the promise ofindustrial upscaling are presented. In case of the DC ‘‘arc in water’’ method, the eect of the angle of the two electrodes on theproduct yield was investigated. The highest nanotube yield and lowest amount of impurities were found at 90. electrode angles.zene/ferrocene solution in case of the injection CVD or ‘‘spay pyrolysis’’ method. Toluene, xylene, cyclohexane, cyclohexanone,n-hexane,n-heptane,n-octane andn-pentane were used as carbon source and cobaltocene and nickelocene as catalyst source. All thesecompounds were found to be suitable for nanotube production. The highest yield and the best quality were obtained when a mixtureof ferrocenenickelocene was used as catalyst and xylene as carbon source
Photonic crystal type structures of biological origin: Structural and spectral characterization
K. Kertesz,Zs. Balint,Z. Vertesy,G.I. Mark,V. Lousse,J.-P. Vigneron,L.P. Biro 한국물리학회 2006 Current Applied Physics Vol.6 No.2
Photonic crystal type structures of biological origin were investigated by scanning electron microscopy (SEM) and UVVISreectance measurements. It was demonstrated that despite the moderate refractive index contrast between chitin and air, biologicalevolution developed in the wing scale nanostructures of butteries representing various families, numerous structures with dierentuse photonic structures, the UV protection mechanism of the high altitude ower Edelweiss has been investigated. We present fullysupportive data that the protection mechanism is based on coupling by nanostructured, highly selective couplers the harmful UVradiation in propagating modes along bers containing UV absorbing pigment.
Application of carbon nanotubes to silicon nitride matrix reinforcements
Cs. Bal?zsi,F. Weber,Zs. Kover,Z. Shen,Z. Konya,Zs Kasztovszky,Z. Vertesy,L.P. Biro,I. Kiricsi,P. Arato 한국물리학회 2006 Current Applied Physics Vol.6 No.2
tiwall carbon nanotube (MWNT) reinforced silicon nitride composites. Morphological, structural, compositional investigations, aswell as mechanical characterization have been performed. The rst results show that carbon nanotubes have been preserved in com-posite structure during these two high-temperature processes. Carbon nanotubes have been found to have good adherence to thesilicon nitride grains as observed for both processing methods. Moreover, carbon nanotubes may serve as crystallization sitesand seeds for silicon nitride grain growth. Signicant dierences have been found between composites prepared by these two sin-obtained by spark plasma sintering. The conventional sintering resulted in partially densied composites with coarser grainstructure