Browsing by Author "Ihdene, Z."

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    Investigation of detection and retention parameters of organic solvents and organophosphorus toxics on mixed polyphenylmethylsiloxane/ H-ZSM-5 zeolite
    (2012) Ihdene, Z.; Mekki, A.; Hamada, B.
    During the last decade many and considerable advances are being realized in the field of detection and measurement using surface acoustic wave (SAW) and quartz crystal microbalances (QCM) based sensors. Thus, the current work attempts to investigate the contribution of polymers based polysiloxane mixed with zeolite in sensitive layers used in the above cited sensors types for detection of organic and organophosphorus toxics. The inverse gas chromatography technique (IGC) which is proven as versatile method for the polymer’s surface exploration was used to understand phenomenon governing the adsorption occurred on the mixed polymer zeolite. The polyphenylmethylsiloxane/HZSM-5 was used as stationary phase to determine the specific retention volumes and the interaction parameters, on two ranges of temperature (200-230°C and 270-300°C). The obtained results with the organophosphorus solutes reveal the existent of strong affinity of retention, which let us to suggest that the prepared blend can be used as sensitive layers for the detection of toxics
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    Study of retention of organophosphorus compoundsand volatile organic solventson polydimethylsiloxane using inverse gas chromatography
    (Metody i Ob'ekty Khimicheskogo Analiza, 2013) Ihdene, Z.; Mekki, A.; Bekkar; Sayah, A.R Djelloul; Kapitanov, I.V.; Karpichev, E.A.; Hamada, B.
    A detailed study of retention of the variety of volatile organic solvents (VOS) and organophosphorus compounds on the polydimethylsiloxane (PDMS) preliminary characterized by FTIR and DSC methods was carried out by means of an inverse gas chromatography technique. The specific retention volumes and infinite dilution activity coefficients were determined for different classes of VOCs, linear and cyclic alkanes, chloroalkanes, oxygen compounds (alcohols, ketones, and esters), and nitriles as well as for typical organophosphorus compounds, 4-nitrophenyl esters of diethyl phosphoric (paraoxon) and diethyl thiophosphoric (parathion) acids. The effect of dipole-dipole interactions and dispersion interactions on the efficacy of the retention of the studied compounds on the PDMS was analyzed. Organophosphorus stimulants are characterized by strong retention on the PDMS, the difference in their retention are to be connected with more efficient dipole-dipole interaction of the oxygen atom of paraoxon with the PDMS than that of the sulphur atom of parathion. A possibility of using PDMS as a base for the detection layers sensitive to organophosphorus compounds was demonstrat