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RISS 인기검색어
- 검색키워드
- 저자 : K. Kertesz (검색결과 2 건)
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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.
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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
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