Ivanovski, Vladimir

Preferred name

Ivanovski, Vladimir

Official Name

Ivanovski, Vladimir

Main Affiliation

vladimir@pmf.ukim.mk

Now showing 1 - 10 of 22

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Dispersion analysis of non-normal reflection spectra from monoclinic crystals
(Elsevier BV, 2012-11)
Mayerhöfer, Thomas G.
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Popp, Jürgen
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Vibrational spectra of a ferrocenyl phosphine derivative chemisorbed on 3-aminopropylsilyl modified silica gel
(Elsevier BV, 2013-11)
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Madalska, Martyna
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Hey-Hawkins, Evamarie
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Thiol anchoring and catalysis of gold nanoparticles at the liquid interface of thin-organic film-modified electrodes
(Elsevier BV, 2014-02)
Mirceski, Valentin
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Aleksovska, Angela
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Mitrova, Biljana
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Detection of siloxane thin films on glass substrate using IR ratio-reflectance spectrum
(Elsevier BV, 2022-04)
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Piwoński, Ireneusz
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Guziejewski, Dariusz
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Mayerhöfer, Thomas G.
In case of thin films of siloxane obtained from different organo-silane derivatives (alkoxy and chloro) on soda lime silica glass substrates, IR-ATR and IR-SR could not detect the organic functional groups of the coating. This becomes even more problematic for the case of tetraethoxysilane (when fully hydrolyzed), the coating of which possesses the same functional groups as the glass substrate. In this work we propose to employ the so-called ratio-reflectance spectra in the v(Si-O) wavenumber region, where both glass and the siloxane coating give most prominent bands, important for the evaluation of the quality of coating formation and qualitative knowledge on its structure. We show that the reflectance-absorbance spectra obtained from the ratio-reflectance spectra are in direct connection to the structure of the siloxane network which depends not only on the chemical nature of the parent silane, but also on the dipping time and the solvent composition. Some characteristics of the reflectance-absorbance spectra, like the appearance of a two well defined bands at 1110 and 975 cm-1, can be correlated to the film morphology and bridging oxygen number. We support our conclusions using principal component analysis of reflectance spectra, contact angle, AFM and SEM measurements.
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Formulation and optimization of bioinspired rosemary extract loaded PEGylated nanoliposomes for potential treatment of Alzheimer's disease using design of experiments
(Elsevier BV, 2021-06)
Shalabalija, Dushko
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Mihailova, Ljubica
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Crcarevska, Maja Simonoska
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Karanfilova, Ivana Cvetkovikj
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Synthesis of 1,1′,2-Trisubstituted Aryl-Based Ferrocenyl Phosphines as Precursors for Immobilized Ligands
(American Chemical Society (ACS), 2013-06-18)
Madalska, Martyna
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Lönnecke, Peter
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Hey-Hawkins, Evamarie
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A direct method of quantification of maximal chemisorption of 3-aminopropylsilyl groups on silica gel using DRIFT spectroscopy
(Elsevier BV, 2015-10-05)
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Hey-Hawkins, Evamarie
3-Aminopropylsilyl (APS) modified silica gel plays an important role as a precursor for further modifications, where APS acts as a spacer or bridging molecule. A monolayer of APS which is most suitable for this purpose was obtained in anhydrous conditions. The properties of the APS-modified silica gel depend on the amount of molecules chemisorbed on the surface. A direct quantitative method using Diffuse Reflectance Infrared Fourier Transform (DRIFT) spectroscopy was proposed. The obtained results were further supported by elemental analysis. The conclusion was that the proposed methodology can be used for the quantification of APS groups chemisorbed on silica gel when the grafting chemical reaction was mainly irreversible.
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Elucidating the interaction between polar alkoxysilane-modified silicate glass and ionic surfactant in the obtainment of hydrophobic transparent film
(Elsevier BV, 2024-12)
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Viscusi, Gianluca
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Liparoti, Sara
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Piwoński, Ireneusz
Soda-lime-silicate glass is a widely used material in industry and everyday life. For some applications, it is important to have hydrophobic properties of its surface and at the same time retain the transparency in the visible spectrum. This can be achieved using fluoroalkyl silanes as surface modifiers. However, fluorine shows severe health effects and the nowadays tendency is to use more appropriate substances for surface modification. In this work, we show the possibility of obtaining a hydrophobic and transparent film on silicate glass using alkoxysilanes with alkyl groups possessing terminal-NH2 and subsequent modification of such silanized glass using an anionic surfactant. The possible mechanism of the interaction between the chemisorbed silyl group and the dodecyl sulfate ion was discussed.
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Infrared refraction spectroscopy - Kramers-Kronig analysis revisited
(Elsevier BV, 2022-04)
Mayerhöfer, Thomas G.
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Popp, Jürgen
Since about 60 years, it is possible to determine the set of optical constants from reflectance measurements by the Kramers-Kronig relations. Unfortunately, the potential of the method seems to be limited in practice by the need to extend measured data into unknown regions by extrapolation, which is prone to error and leads to deviations from the true values in the known region depending on the method of extension. With the advent of infrared refraction spectroscopy, which uses reflectance measurements at normal or near normal incidence, the development of a fast method to determine the complex index of refraction function reliably for these cases has become an even more interesting goal. In this work, we introduce a way to perform a Kramers-Kronig analysis of such reflectance spectra without the need to extrapolate the measured data for higher wavenumbers beyond the measurement range. Furthermore, we introduce and compare very simple and reliable material-independent ways to extrapolate the measured data for lower wavenumbers. As a result, we devise fast and sufficiently accurate methods, which are easily implementable into existing spectrometer software, to extract quantitative spectral information from reflectance measurements at near normal incidence.
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Electrical conductivity of carbon black pigments
(Elsevier BV, 2012-10)
Hauptman, Nina
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Vesel, Alenka
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;
Gunde, Marta Klanjšek

Ivanovski, Vladimir

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