Navegando por Palavras-chave "Nujol"

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    Application of Fluorescence to the Study of Crude Petroleum
    (Springer, 2011-05-01) Steffens, Juliana; Landulfo, Eduardo; Courrol, Lilia Coronato [UNIFESP]; Guardani, Roberto; Universidade de São Paulo (USP); Nucl & Energet Res Inst; Universidade Federal de São Paulo (UNIFESP)
    Crude petroleum oils are complex mixtures of different compounds (mainly organic), which are obtained from an extensive range of different geological sources. the fluorescence of crude petroleum oils derives largely from the aromatic hydrocarbon fraction, and this fluorescence emission is strongly influenced by the chemical composition (e.g., fluorophore and quencher concentrations) and physical characteristics (e.g., viscosity and optical density) of the oil. the fluorescence spectroscopy (FS) is increasingly used in petroleum technology due the availability of better optical detection techniques, because FS offers high sensitivity, good diagnostic potential, and relatively simple instrumentation. in this work we analyzed crude petroleum at different dilution in Nujol, a transparent mineral oil. the main objective of this work was to verify the possibility to measure crude oil emission spectroscopic without use of volatile solvents. the mixtures of nujol with different -crude oil concentrations were measured with a 10 mm optical path cuvette thus simplifying the fluorescence spectroscopy signal detection. the emission spectra were obtained by exciting the samples with a 400 W Xenon lamp at 350 nm, 450 nm and 532 nm. the emissions of the samples were collected perpendicularly with the excitation axis.
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    Ozonated mineral oil: preparation, characterization and evaluation of the microbicidal activity
    (Korean Acad Asthma Allergy & Clinical Immunology, 2016) Iorio, Fernanda B. R. D. [UNIFESP]; Liberatore, Ana M. A. [UNIFESP]; Koh, Ivan H. J.; Otani, Choyu; Camilo, Fernanda F. [UNIFESP]
    The ozonation of vegetable oils has been studied, since the produced ointments have antibacterial and fungicidal activities. However, the ozonation of mineral oils has not been reported in the literature yet, opening an interesting field for examination. In this work, we have shown the ozonation of a commercial mineral oil (Nujol). The main goal was to produce oils containing free ozone, so that this gas could act as antimicrobial agent. It was found that in Nujol, ozone remains for at least 40days and in the sample ozonized for 15h its concentration was 7.5mgmL(-1). Neat Nujol showed no antimicrobial activity against the tested microorganisms, however, when ozonated it showed antimicrobial activity against Enterococcus faecalis, Staphylococcus aureus and Escherichia coli.