Doping of calcium phosphate glasses from the ternary system SiO2-CaO-P2O5, with transition metals ions makes them to acquire additional properties, of a prophylactic nature (anti-inflammatory, healing, antimicrobial). This paper presents the microbiological study performed of three glass compositions synthesized by sol-gel method, one doped with silver, the other doped with copper II, compared to a control sample, with the same compositional matrix, but not doped, in order to highlight their antimicrobial character and the determination of the minimum bactericidal dose of each type of glass on two strains of bacteria with high pathogenic potential.
The experimental results obtained in this paper was made by investigation of water samples collected from different zones of Ialomita River to characterize the quality indices of water. Salinity, electrical conductivity and other physicochemical indicators of samples (pH, turbidity) were investigated in the order to establish the real pollution degree of Ialomita River. The heavy metals concentrations containing Pb, Cd, Zn, Ni, Cr, Mn, and Fe were determined by Flame Atomic Absorption Spectrometry (FAAS). The obtained data confirmed that heavy metals are coming from various pollutant sources and the main anthropogenic sources were industrial waters and municipal wastewaters pathogenic which include organisms, plant nutrients, synthetic organic chemicals, inorganic chemicals, microplastics, sediments, oil etc.
Depending on the Si content, the magnetic and the electrical properties of steels for electrotechnical purpose are produced with oriented grains or contrarily with non-oriented grains. Usually, the Si content of such steels varies between 0.8 - 4.8%. Generally, steels with less than 3% Si are used for small and medium power electric machines, while steels with higher Si content, i.e. above 3%, are used for high power electric machines and electric transformers. Si in steel increases the strength and decreases the magnetic losses guaranteeing the development of large grains, which improves the magnetic properties of the laminated sheets. For the processing of the sheets, the magnetic core of the electric machine has to be considered in addition to the magnetic properties of the material and the energy losses, the evolution of the material’s microstructure in the cutting area, which may possibly need reconditioning operations. The aim of this study is oriented to the morphological, mechanical electrical and magnetic characterization of Si steel with non-oriented grains in order to be further employed as transformer cores.
The addition of silver ions in the structure of materials with medical uses is a relatively recent technique for orthopedic and maxillofacial reconstruction and aims to reduce the risk of bacterial contamination in the implant. In this paper are presented experimental results for two phosphocalcic glasses from SiO2-CaO-P2O5 system. One of these compositions synthesized by the sol-gel method has been doped with silver. The unsoaked samples show specific spectra of the amorphous structures corresponding to glasses, such as calcium phosphates and calcium silicates. The only crystalline formations present in the glass doped silver structure was metallic silver, highlighted by the peaks at 37.9 2θ and 44.2 2θ, which gives of this composition as being part of glass-metal composite materials [1]. After soaking in simulated body fluid (SBF), both compositions exhibit bioactivity, formation of hydroxyapatite (HAp) on the surface of the glasses, after the first 3 days, with an apparent maximum after 14 days. The silver doped sample has an increase in the number of HAp peaks and after 21 days of immersion, which confirms the assumption that the presence of silver ions increases the effect the bioactivity of the glasses [2]. These results are also confirmed by FTIR and SEM analysis.
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