Browsing by Author "Spoiala, Dorin"

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Red blood cells interaction with vanadium and its oxides based nanocomposite structures [Articol]
(INOE Publishing House, 2014) Prilepov, V.; Gasin, P.; Prilepov, I.; Midoni, V.; Chirița, Arcadii; Spoiala, Dorin; Ketrush, P.
The results of the investigation of vanadium and its oxides based nanocomposite structures interaction with the water are brought in this paper. It was established, that at the non-contact interaction of the nanocomposite structures with the water, its activation occurs, which is revealed in a change in the sign of the redox potential of the water from the initial positive to the negative one. Besides, the activation effect is interconnected, i.e. the activation both of the water as well as of nanocomposite structures occurs. The observed effect is explained in the frame of the resonance interaction of the oscillating dipoles theory (the conductive clusters uniformly distributed in V2O5 dielectric matrix with the water molecule dipoles. On the basis of the experimental results, one can affirm that the vanadium and its oxides based nanocomposite structures are a biologic activators and can be used in a modern biomedicine
Studies of vanadium and vanadium oxide based nanocomposite structures [Articol]
(2017) Prilepov, Vladimir; Gashin, Peter A.; Popescu, Mihai; Zalamai, Victor; Spoiala, Dorin; Ketrush, Petru; Nasedchina, Nadejda
The results of the surface morphology studies as well as optical and electrical properties of nano-dimensional vanadium oxide composite structures deposited on various substrates- silica, glass substrates covered by conducting layer of SnO2, pure pyroceramics plates and the same covered by Al2O3, SiO2, Ta2O5 layers are presented. According to Raman spectroscopy results the thin film structure obtained on quartz corresponds to the -V2O5 orthorhombic phase. In contrast with this the Raman spectra of V2O5 films obtained on pyroceramics substrates, passivated by Al2O3, Ta2O5, SiO2 oxides, do not appear clearly marked narrow lines which indicate their amorphous character. The investigation of the optical properties of the fabricated layers in the spectral range of 200-1000 nm had revealed the presence of both allowed direct and indirect electron transitions. In the frequency range of 103-107 Hz the real Z' and imaginary Z'' part of the total impedance of pyroceramics/Al2O3/Al/V2O5/Al structure were studied. The applied direct bias leads to a considerable Z', as well as Z'' decrease. The analysis of the obtained dependencies is carried out by using the method of equivalent circuits.
Technology of vanadium and its oxides based nanocomposite structures [Articol]
(INOE Publishing House, 2014) Prilepov, V.; Gasin, Petru; Chirița, Arcadii; Midoni, V.; Spoiala, Dorin; Ketrush, Petru
The peculiarities of vanadium and its oxides based nanocomposite structures fabrication are brought in this paper. The selected fabrication technological conditions allow creating a V2O5 based dielectric matrix in which conducting clusters are uniformly distributed. Some optical and electrical properties of such structures are presented. It was shown that the obtained layers possess high charge sensitivity.