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The synthesis, surface analysis, and cellular response of titania and titanium oxynitride nanotube arrays prepared on TiAl6V4 for potential biomedical applications
Katja Andrina Kravanja, Luka Suhadolnik, Marjan Bele, Uroš Maver, Jan Rožanc, Željko Knez, Maša Knez Marevci, Matjaž Finšgar, 2023, original scientific article

Abstract: Titania nanotubes are gaining prominence in the biomedical field as implant materials due to their mechanical durability, nano-rough properties, and positive influence on cellular response. This work aimed to synthesize titania and titanium oxynitride (TieOeN) nano- tubular arrays on TiAl6V4 substrates using an anodic oxidation process followed by annealing in air or by additional nitridation in NH3 atmosphere. Different nanotubular layers of unique morphology and structure were fabricated and investigated using advanced surface analysis and biocompatibility tests. In-depth surface analysis was per- formed by field emission scanning electron microscopy (FE-SEM), atomic force microscopy (AFM), 3D profilometry, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and time-of-flight secondary ion mass spectroscopy (ToF-SIMS). Cell testing using adipose- derived mesenchymal stem cells and human fetal osteoblasts demonstrated good cell viability, high proliferative capacity, and a favorable overall effect on cell morphology for the TieOeN nanotubes.
Keywords: surface analysis, XPS, AFM, tandem ToF-SIMS, titania nanotubes, Ti-O-N nanotubes, anodization
Published in DKUM: 07.05.2024; Views: 102; Downloads: 8
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Time and potential-resolved comparison of copper disc and copper nanoparticles for electrocatalytic hydrogenation of furfural
Nik Maselj, Vasko Jovanovski, Francisco Ruiz-Zepeda, Matjaž Finšgar, Tamara Klemenčič, Jan Trputec, Ana Rebeka Kamšek, Marjan Bele, Nejc Hodnik, Primož Jovanovič, 2023, original scientific article

Abstract: Herein, a comparative analysis of two case example catalysts for electrocatalytic hydrogenation (ECH) of furfural under acidic conditions, namely a copper polycrystalline disc and copper nanoparticles dispersed on carbon support, is performed. To gain a detailed insight on ECH trends, a task-specific methodology is employed based on electrochemistry–mass spectrometry coupling, which enabled time- and potential-resolved detection of volatile ECH products, i.e., 2-methylfurane (2-MF) and H2. In this way, the ability to elucidate potential-dependent product distribution for the two catalysts, namely faradaic efficiency, is achieved. Accordingly, the nanoparticulate analog is significantly more active toward competitive hydrogen evolution reaction and 2-MF production, whereas the polycrystalline sample is more selective toward furfuryl alcohol. The observed differences in ECH are ascribed to alterations in surface domains, which is supported by surface-sensitive lead underpotential deposition characterization.
Keywords: baker, nanodelci, elektrokataliza, copper, nanoparticles, electrocatalytic hydrogeneration
Published in DKUM: 19.04.2024; Views: 94; Downloads: 2
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Sinteza magnetnih nanodelcev, funkcionaliziranih s tanko plastjo silike
Stanislav Čampelj, Darko Makovec, Marjan Bele, Mihael Drofenik, Janko Jamnik, 2007, original scientific article

Abstract: V prispevku opisujemo pripravo maghemitnih nanodelcev prevlečenih s siliko. Postopek je potekal v treh ločenih stopnjah. V prvi smo delce sintetizirali s koprecipitacijo ionov Fe[na]{2+} in Fe[na]{3+}. V drugi smo delce prevlekli s citronsko kislino, da bi preprečili aglomeracijo, in jih dispergirali v vodi. Uspešnost dispergiranja smo spremljali z ugotavljanjem masnega deleža delcev, dispergiranih v vodi. Vsebnost delcev je odvisna od pH-vrednosti pri kateri secitronska kislina adsorbira na površini in koncentracije raztopljene citronske kisline. Tretja stopnja postopka je vsebovala prevlačenje nanodelcev s siliko, ki je potekalo v vodni suspenziji. Ključnega pomena za uspešno prevlačenje nanodelcev s siliko je stabilnost suspenzije nanodelcev oblečenih s citronsko kislino.
Keywords: maghemit, nanodelci, citronska kislina, silika, vodna suspenzija
Published in DKUM: 23.03.2017; Views: 1441; Downloads: 123
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