Abstract
To study the effect of network modifier ZnO on the biological activity and electrical transport properties, the quaternary glass system x ZnO–(20-x) TeO2–30Li2O–50B2O3 (0 ≤ x ≤ 20) was prepared by the melt quenching technique. The antibacterial properties of the glass system were studied with three bacterial strains Escherichia coli, Staphylococcus aureus and Salmonella species. Two strains of gram negative (salmonella species) and one strain of gram positive (Staphylococcus aureus) bacteria were used. Electrical transport properties were also studied with AC conductivity measurements in the frequency range 5 Hz–35 MHz at various temperatures. Cole-Cole impedance plots of the glass system show semicircle and its radius decreased with increasing temperature. At lower temperatures the results of dielectric properties of the glass system did not exhibit good results. Tangent loss (tan δ) and dielectric permittivity (ɛ′) decreased with increase of frequency. AC conductivity of the studied glass system is increased with increase in frequency and temperature. Addition of ZnO causes enhancement of AC conductivity which is observed in the order 10−2 Ω−1 cm−1.
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