Antibacterial Potential of SrBi2Ta2O9 Synthesized viaMolten Salt Method

Magnesium niobate (MgNb2O6) powder was synthesized by the conventional ceramic route as well as by the molten salt route using a eutectic mixture of NaCl-KCl as the salt and Mg(NO3)2-6H2O and TiO2 as the starting materials. Pure phase of MgNb2O6 could be obtained by the molten salt method at 1100°C. However, in ceramic method the pure phase of MgNb2O6 was obtained by heating at 1025°C for 20 h. On sintering at 1100°C the dielectric constant and dielectric loss of MgNb2O6 obtained by the molten salt method was found to be 19.5 and 0.004 at 100 kHz at room temperature. Lower values were obtained for these oxides prepared by the ceramic route, 16.6 and 0.000518, respectively. In both cases the dielectric constant was quite stable with frequency.

Low temperature synthesis of nano-sized (Sn 0.25,Ti 0.75)O 2 photocatalysts by a molten salt method

The relationships between the synthesis and processing, atomic-level and long-range structure, and the electrical properties of lead magnesium niobate, Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/ (PMN), and the solid solution systems with lead titanate, PbTiO/sub 3/ (PT), have been investigated. High-purity PMN and 0.90PMN-0.10PT powders were synthesized using the columbite, modified columbite, mixed oxide and molten salt methods. X-ray diffraction analysis of the powders and pressed ceramics show phase purity variations from 70-100% PMN perovskite. Solid-state /sup 93/Nb MAS NMR spectra of PMN powders and ceramics from the molten salt and modified columbite show differences in the /sup 93/Nb resonances due to ordered and disordered regions in the PMN. Broadband electrical properties measurements, including unbiased and dc field-induced dielectric properties from -40 to 180/spl deg/C, and the electric field dependence of strain and polarization were measured for selected PMN ceramics. The dielectric measurements measured at 1 kHz yielded a K/sub max/ of 20,000 for the molten salt PMN (at -8/spl deg/C) and 17,900 for the columbite PMN (at -4/spl deg/C). The molten salt 0.90PMN-0.10PT exhibited a K/sub max/ of 26,000 at 1 kHz. Piezoelectric coupling factors of approximately 0.50 were measured for the 0.90PMN-0.10PT from the molten salt synthesis, with a dc bias of 0-15 kV/cm. SEM analysis of PMN ceramics obtained by the molten salt and columbite methods of powder synthesis show differences in both grain size distribution and heterogeneity.

Electrochemical performances of LiFePO 4/C composites prepared by molten salt method

Molten salt synthesis of complex perovskite-related dielectric oxides

Neutron adsorption performance of Dy2TiO5 materials obtained from powders synthesized by the molten salt method

Characterization and electrochemical properties of high tap-density LiFePO4/C cathode materials by a combination of carbothermal reduction and molten salt methods

Vanadium (V)-doped Bi4Ti3O12 compound is reported to have good photocatalyst properties; however, efforts still need to improve the ability of the photocatalyst through various strategies, such as controlling the morphology and particle size. The molten salt method is one of the simple synthesis methods reported successful in synthesizing Bi4Ti3O12 compounds with plate-like/sheet morphology and reported having good photocatalyst activity. One of factor influenced to particle compound obtained by molten salt method is synthesis temperature. Therefore, in this work, V-doped Bi4Ti3O12 (Bi4Ti2.95V0.05O12) was prepared through the molten salt NaCl/KCl method at various synthesis temperatures: 700, 750, and 800?C and the effect of temperature synthesized on (a) structural (b) morphological, and (c) band gap energy were studied. These studies used X-ray diffraction data (diffractogram), scanning electron microscope (SEM) and diffuse reflectance ultraviolet-visible spectroscopy. The diffractograms showed that the target compound was successfully obtained at all temperature synthesis. The crystallographic data indicated that temperature synthesis determined the lattice parameter values. However, there are no clear trend changes that is possibly due to changes in the valence of the V atom. The synthesis temperature also causes increasing the crystallite size but does not affect the crystallinity samples. SEM images showed that all samples had plate-like/sheets morphology and the particle size became larger at higher temperature. It indicated that the particle growth rate was faster than nucleation rate. Meanwhile, the result of Kubelka-Munk calculation showed that all samples had relatively same band gap energy value (Eg(1) was ~ 2.90, and Eg(2) was ~1.85 eV.

Hollow spherical 0.5Li2MnO3·0.5LiMn1/3Ni1/3Co1/3O2 prepared by facile molten salt method for enhanced long-cycle and rate capability of lithium-ion batteries

The different crystal orientations of NaNbO3 microcrystalline powders were synthesized by the molten-salt growth method with different precursors. The plate-like (001)-NaNbO3 orthogonal powders were synthesized by topochemical conversion using Bi2.5Na3.5Nb5O18 as precursor particles. The tabular NaNbO3 template particles were about 0.5–1 μm in thickness and about 15–25 μm in length. The rod-like (101)-NaNbO3 orthogonal powders were fabricated with Nb2O5 as a precursor. The preparation of Nb2O5 precursors required two processes: the molten salt method and the ion exchange method, respectively. The rod-like (101)-NaNbO3 orthogonal powders were about 0.6 μm in average diameter, and 8 μm in average length. The plate-like and rod-like orthogonal NaNbO3 powders had high aspect ratios. The diffraction peaks of plate-like NaNbO3 correspond to standards card JCPDS-33-1270, and its space group was Pbma. The crystal cell of Pbma NaNbO3 was a typical antiferroelectric structure. The diffraction peaks of rod-like NaNbO3 correspond to standard card JCPDS-86-0606, and its space group was P2lmc. The cell structure of P2lmc NaNbO3 was a typical ferroelectric structure.

Effect of ZrO2 particle size on morphology and synthesis temperature of nano CaZrO3 synthesized via molten salt method

Microbial resistance has become a threat that causes thousands of deaths yearly; therefore, efforts are required to address this problem. One of the promising methods used to inhibit bacterial growth is photocatalyst technology. In this research, CaTiO3 compounds was synthesized using the molten salt method and tested for antibacterial activity in both UV-unexposed and UV-exposed conditions on Staphylococcus aureus bacteria. The diffractogram showed that the CaTiO3 compound was successfully synthesized without impurities that indicated by the characteristic peaks at 2θ (o) = 23.29; 33.18; 47.52; 59.33; 69.48; 79.17. The micrograph results showed that the CaTiO3 compound had a regular polyhedral shape and was agglomerated with particle sizes in the 0.2941 ± 0.0144 µm range. The UV-Vis DRS spectra showed that the CaTiO3 compound had a bandgap energy of 3.48 eV (315 nm). In the antibacterial activity test results under UV irradiation, the growth of Staphylococcus aureus decreased by 3.95, 0.91, and 1.45 CFU/mL.

The LiFePOB4B and LiFePOB4B/C cathode materials were rapidly synthesized by molten salt method, where a KCl-MgClB2B eutectic salt was used as reaction media of the formation of LiFePOB4B and a relatively low synthesis temperature was adopted. X-ray diffraction (XRD) patterns of both samples were identified to orthorhombic olivine LiFePOB4B without obvious impurities. The LiFePOB4B was observed to micron-sized cuboid structure and the LiFePOB4B/C with nano-carbon layers had particle size distribution from nanometers to 3 μm by morphological characterization. The electrochemical results showed that the LiFePOB4B/C deliverd a larger discharge capacity than the LiFePOB4B did due to the conductive carbon improving the electrchemical activities of the materials and providing a high LiP+P transfer kinetics.

Due to broad-spectrum antimicrobial activity, silver nanoparticles have great application potential in disinfection of contaminated water. The aim of this research was the introduction of a fast and simple method titled as “molten salt method” for the production of silver-doped bioactive silica gel (SG) nanocomposite. In this method, SG was imposed into the molten salt of silver nitrate at 150 and 300 °C for various times. Interestingly, molten salt method was not utilized any reducing reagent or other chemicals unless molten silver nitrate. The synthesis and fixing of nanoparticles into the support were done in <60 min. The prepared silver/SG nanocomposite was evaluated using scanning electron microscope (SEM), energy dispersive X-ray fluorescence, leaching test and antibacterial test. SEM images showed that the contact of SG with the molten salt caused the formation of nanoparticles on the SG. On the other hand, increasing the contact time, it led to a larger and increased number of particles. The antibacterial tests demonstrated that this composite is suitable for using as antibacterial material. The test of elution with water indicated that the prepared nanocomposite is stable and the amount of the released silver in the water was negligible.

Preparation of anode material zinc ferrite by molten salt method and its electrochemical performance