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P$_2$O$_5$; K$_2$O; V$_2$O$_5$; IR; ESR; antibacterial effect.

The $x$V$_2$O($1 − x$)[0.8 P$_2$O$_5$·0.2K$_2$O] glass system with $0 \lt x \lt 50$ mol% was prepared and the structural changes induced in these glasses by increasing the vanadium oxide content were investigated by IR and ESR spectroscopies. The dual behaviour role of V$_2$O$_5$ oxide, as network modifier (for $x\lt 10$ mol%) and the network former ($x\gt 20$ mol%), as a consequence of phosphate network depolymerization and P–O–V and V–O–V linkages appearance was also highlighted. The antibacterial effect of the glasses with $x \lt 20$ mol% V$_2$O$_5$ content was tested by optical density (OD) measurements. A linear correlation between the amount of vanadium and the antibacterial effect was evidenced.

N S VEDEANU¹ I B COZAR² R STANESCU³ R STEFAN⁴ D VODNAR⁴ O COZAR^{3 5}

1. Iuliu Hatieganu University of Medicine and Pharmacy, Faculty of Pharmacy, RO-400023 Cluj-Napoca, Romania
2. National Institute for Research and Development for Isotopic and Molecular Technologies, RO-400293 Cluj-Napoca, Romania
3. Babes-Bolyai University, Faculty of Physics, Kogalniceanu 1, 400084 Cluj-Napoca, Romania
4. University of Agricultural Science and Veterinary Medicine, 400372 Cluj-Napoca, Romania
5. Academy of Romanian Scientists, Splaiul Independentei 54, RO-050094 Bucharest, Romania

Manuscript received

29 September 2015

Accepted

5 January 2016