Browsing by Author "Mikšíček, Jiří"

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    New voltammetric method for rapid determination of phenolic antioxidant 2-tert-butylphenol in synthetic oils using gold electrode
    (SPRINGER WIEN, SACHSENPLATZ 4-6, PO BOX 89, A-1201 WIEN, AUSTRIA, 2019-09-01) Chýlková, Jaromíra; Janíková, Lenka; Šelešovská, Renáta; Mikšíček, Jiří
    Simple voltammetric method for practical determination of an antioxidant 2-tert-butylphenol (2-TBF) was developed using gold disk working electrode and linear sweep voltammetry. 2-tert-Butylphenol provided one anodic signal at about +1300mV in the environment of ethanolic solution of H2SO4. A non-linear growth of the response with added amount of 2-tert-butylphenol was observed, and low detection (LOD=0.67 mu gcm(-3)) and quantification limit (LOQ=2.22 mu gcm(-3)) were obtained. Applicability was verified by analysis of samples of mineral and synthetic oils.
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    Production of electrospun nanofibers based on graphene oxide/gum Arabic
    (ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, 2019-03-01) Silvestri, Daniele; Mikšíček, Jiří; Waclawek, Stanislaw; Torres-Mendieta, Rafael; Padil, Vinod V. T.; Černík, Miroslav
    Over the last few years, the electrospinning technique has attracted significant attention for the production of novel nanofibrous materials. At the same time, the use of graphene oxide and the natural products extracted from plants and/or trees have become very popular in various fields of science. In this work, a new method for the production of nanofibers based on a combination of Gum Arabic (GA), as a natural tree gum exudate, PVA, as an environmentally-friendly stabilizer, and graphene oxide (GO) has been developed and characterized. SEM analysis showed fundamental differences on the surface of bare nanofibers with and without GO, and also significantly smaller fiber diameters in the case of the presence of GO (fibers <100 nm present). Raman spectroscopy confirmed and TGA analysis approximated the content of GO in the nanofibers. Adsorption of methylene blue on the produced nanofibrous membrane was about 50% higher in the presence of GO, which opens the possibility to use GO/GA/PVA fibers in several applications, for example for the removal of dyes.