Sandu A.V.,Technical University Gheorghe Asachi |
Bejinariu' C.,Technical University Gheorghe Asachi |
Nemtop G.,Alexandru Loan Cuza University of Lasi |
Sandu' I.G.,Technical University Gheorghe Asachi |
And 3 more authors.
Revista de Chimie | Year: 2013
The paper presents the obtaining and characterization of new anticorrosion phosphate layers deposited on steel substrate. The layers are obtained by co-precipitation in acid aqueous medium with addition of metallic cations, which influence the formation of crystallites and the uniformity of the layers. SEM-EDX and corrosion test were applied on the samples in order to determine their characteristics. Nickel cations improve the corrosion stability of the layers and allow obtaining of continuous, adherent to substrate layers with controlled physical-structural and chemical properties.
Hutanu I.,Alexandru Loan Cuza University of Lasi |
Sandu I.,Alexandru Loan Cuza University of Lasi |
Vasilache V.,Alexandru Loan Cuza University of Lasi |
Nica L.L.,Alexandru Loan Cuza University of Lasi |
Sandu I.C.A.,University of Evora
Revista de Chimie | Year: 2015
The first operation in preservation and restoration of patrimony objects of painted wood, which present detachments of painting layer, is the preventive consolidation. This operation is followed by the derinitive consolidation and the primary biocide. The present study focuses on the adaptability of the acrylic binder in the consolidation of damaged painting layer of an icon which is in collapse. The analyses were made using the following techniques: OM, SEM-EDX and CIEL∗a∗b∗ colorimetry. For this experiment there were used 5 painted wood samples from the icon under study. Two of them were coated by brush, with and without Japanese paper with an acrylic binder; and the other two with isinglass (used frequently as a traditional binder). A sample from the damaged icon was kept and compared with the other samples presented above. For the calculation of the aging factor through thermo-oxidative was used the Arrhenius equation. The samples were kept for 12h at a temperature of 115°C, which is equivalent to aging at 20°C for one year. According to the colorimetric analysis, the best results were obtained on the coating samples with acrylic binder, without Japanese paper, and the intensity of the colour was modified with less than one unit, compared to the values recorded by the other samples.
Bociort D.,Science Compana de Apa |
Gherasimescu C.,Technical University Gheorghe Asachi |
Berariu R.,Technical University Gheorghe Asachi |
Butnaru R.,Technical University Gheorghe Asachi |
And 2 more authors.
Revista de Chimie | Year: 2012
The paper presents detailed results of the analysis of surface water (Mureş river) and groundwater (Cris basin) on the content of ammonium, nitrites, nitrates, arsenic, iron, zinc, cadmium and copper, compared to the maximum values admitted by the current legislation. These waters are sources of drinking water for human consumption, after complex processes of treatment. We haue found that tolerance limits are exceeded in the case of ammonium content, arsenic and iron for groundwater and iron content for the surface water. Generally, the groundwater has lower concentrations than surface water, for all elements analyzed.
Bahrin L.G.,Alexandru Loan Cuza University of Lasi |
Luca A.C.,Grigore T. Popa University of Medicine and Pharmacy |
Birsa L.M.,Alexandru Loan Cuza University of Lasi
Revista de Chimie | Year: 2014
The synthesis of novel flavanone-dithiocarbamic acid esthers has been achieved by reacting the corresponding dithiocarbamic acid ester with various aminals. The newly obtained flavanones were then converted into their corresponding 1,3-dithiolium perchlorates by cyclocondensation using an acid-based catalyst.