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Pécs, Hungary

Beke S.,Italian Institute of Technology | Barenghi R.,CNR Institute of Neuroscience | Farkas B.,Italian Institute of Technology | Romano I.,Italian Institute of Technology | And 4 more authors.
Materials Science and Engineering C | Year: 2014

The development of bioactive materials is in the premise of tissue engineering. For several years, surface functionalization of scaffolds has been one of the most promising approaches to stimulate cellular activity and finally improve implant success. Herein, we describe the development of a bioactive composite scaffold composed of a biodegradable photopolymer scaffold and titanate nanotubes (TNTs). The biodegradable photopolymer scaffolds were fabricated by applying mask-projection excimer laser photocuring at 308 nm. TNTs were synthesized and then spin-coated on the porous scaffolds. Upon culturing fibroblast cells on scaffolds, we found that nanotubes coating affects cell viability and proliferation demonstrating that TNT coatings enhance cell growth on the scaffolds by further improving their surface topography. © 2014 Elsevier B.V. All rights reserved.

Beke S.,Italian Institute of Technology | Korosi L.,Enviroinvest Corporation | Nanai L.,University of Szeged | Brandi F.,Italian Institute of Technology
Vacuum | Year: 2012

This study aims to analyze the elemental composition, and temporal- and spatial distributions of vanadium atoms and ions in the laser-induced vanadium oxide plasma under high vacuum using optical emission spectroscopy. Neutral atoms and singly charged V ions were detected under high vacuum in the emission spectra. The mean translational velocity of neutral V atoms in their first 25 mm propagation was estimated to be 15.7 km/s using the temporal- and spatial dynamics investigation of neutral V species in the plasma. © 2012 Elsevier Ltd. All rights reserved.

Beke S.,Italian Institute of Technology | Korosi L.,Enviroinvest Corporation | Scarpellini A.,Italian Institute of Technology | Anjum F.,Italian Institute of Technology | Brandi F.,Italian Institute of Technology
Materials Science and Engineering C | Year: 2013

Rigid, biodegradable photopolymer scaffolds were coated with titanate nanotubes (TNTs) by using a spin-coating method. TNTs were synthesized by a hydrothermal process at 150 C under 4.7 bar ambient pressure. The biodegradable photopolymer scaffolds were produced by mask-assisted excimer laser photocuring at 308 nm. For scaffold coating, a stable ethanolic TNT sol was prepared by a simple colloid chemical route without the use of any binding compounds or additives. Scanning electron microscopy along with elemental analysis revealed that the scaffolds were homogenously coated by TNTs. The developed TNT coating can further improve the surface geometry of fabricated scaffolds, and therefore it can further increase the cell adhesion. © 2013 Elsevier B.V.

Korosi L.,Enviroinvest Corporation | Scarpellini A.,Italian Institute of Technology | Petrik P.,Institute for Technical Physics and Materials Science | Papp S.,Enviroinvest Corporation | Dekany I.,University of Szeged
Applied Surface Science | Year: 2014

Nanostructured indium tin oxide (ITO) powders and thin films differing in morphology and porosity were prepared by a sol-gel method. In3+ and Sn4+ were hydrolyzed in aqueous medium through the use of ethanolamine (EA) or sodium acetate (AC). X-ray diffraction measurements demonstrated that both EA and AC furnished indium tin hydroxide, which became nanocrystalline after aging for one day. The indium tin hydroxide samples calcined at 550°C afforded ITO with a cubic crystal structure, but the morphology differed significantly, depending on the agent used for hydrolysis. Electron microscopy revealed the formation of round monodisperse nanoparticles when AC was used, whereas the application of EA led to rod-like ITO nanoparticles. Both types of nanoparticles were suitable for the preparation of transparent and conductive ITO thin films. The influence of the morphology and porosity on the optical properties is discussed. © 2014 Elsevier B.V. All rights reserved.

Krosi L.,Hungarian Academy of Sciences | Krosi L.,Enviroinvest Corporation | Papp S.,Hungarian Academy of Sciences | Papp S.,Enviroinvest Corporation | And 6 more authors.
Journal of Solid State Chemistry | Year: 2012

Titanate nanotubes were synthesized from TiO 2 in alkaline medium by a conventional hydrothermal method (150 °C, 4.7 bar). To obtain hydrogen titanates, the as-prepared sodium titanates were treated with either HCl or H 3PO 4 aqueous solutions. A simple synthesis procedure was devised for stable titanate nanotube sols without using any additives. These highly stable ethanolic sols can readily be used to prepare transparent titanate nanotube thin films of high quality. The resulting samples were studied by X-ray diffraction, N 2-sorption measurements, Raman spectroscopy, transmission and scanning electron microscopy, X-ray photoelectron spectroscopy and spectroscopic ellipsometry. The comparative results of using two kinds of acids shed light on the superior thermal stability of the H 3PO 4-treated titanate nanotubes (P-TNTs). X-ray photoelectron spectroscopy revealed that P-TNTs contains P in the near-surface region and the thermal stability was enhanced even at a low (∼0.5 at%) concentration of P. After calcination at 500 °C, the specific surface areas of the HCl- and H 3PO 4-treated samples were 153 and 244 m 2 g -1, respectively. The effects of H 3PO 4 treatment on the structure, morphology and porosity of titanate nanotubes are discussed. © 2012 Elsevier Inc. All rights reserved.

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