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In this paper, in order to effectively utilize salt lake magnesium resources, we focused on a functional material containing magnesium, i.e. magnesium oxide, MgO, which is a type of antibacterial material. Through a first-principles study from the atomic level, the microstructure of MgO containing doped point defects of different elements was studied. The relationship between the microscopic structure of the material and its special antibacterial function was explored. The results are as following: the interstitial impurities in MgO are more helpful than substituted impurities for the improvement of the electronic structure. The analysis of the influence of different doping elements on the microstructure confirmed theoretically that Ag and Cu have the same highly active antimicrobial properties with the same change of microstructure, thereby confirming the relationship between microstructure and antimicrobial activity. The results of the simulations match the experimental results, thereby theoretically demonstrating the relationship between defects and antibacterial activities and providing further insight into the nature of the antibacterial mechanism. [ABSTRACT FROM AUTHOR]

Abstract: In this paper, we investigated the structure, morphology and photoluminescence properties of hexagonal SrSiO3:Eu2+ micro-octahedrons and prism-like hollow microstructures prepared by the hydrothermal method at a relatively low temperature (180°C). Reactant concentration and reaction time showed strong effects on the phase formation and morphology of the products. The prepared samples were systematically characterized by X-ray diffraction, energy dispersive X-ray spectrometry, field emission scanning electron microscopy, excitation and emission photoluminescence (PL). The possible formation mechanisms of these SrSiO3:Eu2+ microcrystals were proposed. Finally, the PL properties of SrSiO3:Eu2+ microcrystals were also investigated. [Copyright &y& Elsevier]

Abstract: For the first time the polyetheretherketone (PEEK)–hydroxyapatite (HA) nanocomposite materials were successfully prepared, and their microstructure and mechanical properties, such as tensile strength, load–displacement and Young''s modulus, were examined. The specimens laminated by the PEEK–HA composite layers with 5vol.% and 15vol.% HA were also successfully made, which gave a promising mechanical strength and a high HA content on the specimen surface. This novel approach should be of significance in manufacturing PEEK–HA biomaterials with both satisfactory mechanical properties and high bioactivity. [Copyright &y& Elsevier]

Abstract: The treated basalt and glass fibers with sodium hydroxide and hydrochloric acid solutions for different times were analyzed, respectively. This paper summarized the mass loss ratio and the strength maintenance ratios of the fibers after treatment. The fibers’ surface corrosion morphologies were characterized using scanning electron microscopy and their compositions were detected using energy dispersive X-ray spectroscopy. The acid resistance was much better than the alkali resistance for the basalt fibers. Nevertheless, for the glass fibers the situation is different: the acid resistance was almost the same as the alkali resistance. Among the two types of aqueous environments evaluated, the alkali solution is the most aggressive to the fibers’ surface. The possible corrosion mechanisms are revealed. [Copyright &y& Elsevier]

Magnetoelectric particulate composites composed of (PZT) and CoFe2O4 (CFO) (molar ratio: =1:1) are prepared via an ethylenediaminetetraacetic acid (EDTA)–citrate gel process. In the composite sample sintered at 1080°C, crystalline CFO particles 1–2μm in size are uniformly distributed in the PZT matrix, which has a grain size of 0.3–0.5μm. This microstructure leads to a high electrical resistivity (∼, which is a significant improvement on previous studies. [Copyright &y& Elsevier]