Tailoring the surface morphology of TiO2 nanotube arrays connected with nanowires by anodization

Different surface morphologies of TiO₂ nanotube arrays were formed by anodization of Ti foils in various water-containing electrolytes at various voltages. Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) were used to investigate the morphology of TiO₂ nanowires. The results show that the morphology of TiO₂ nanowires is apparently influenced by viscosity of electrolytes and voltage. In this case, we introduce a detailed formation mechanism of nanowires that shows a strong relationship between the formation of TiO₂ nanowires and TiF₆²⁻ concentration. It was also found that TiO₂ nanowires are polycrystalline with anatase phase after annealing at 450 °C for 3 h.     

离子色谱法同时测定饮用水源中七种阴离子

本文通过研究建立了离子色谱法同时测定水中F^-、CL^-、NO2^-、Br^-、NO3^-、H2PO4^-、SO4^2-七种离子的方法,方法的检出限低、灵敏度高、线性范围广、抗干扰强、操作简便,可快速同时测定不同数量级浓度的离子。有效地满足饮用水安全保障预警体系中对源水、出厂水进行无机消毒副产物和其他控制阴离子的快速检测。     

Ion distribution and protein proteolysis affect water holding capacity of Longissimus thoracis et lumborum in meat of lamb subjected to antemortem exercise

Exercise has been shown previously to reduce the water holding capacity (WHC) of meat in lamb. The consequence of changes in the distribution of ions pre- and post-rigor and proteolysis on WHC is relatively unknown. Twelve crossbred lambs were used to investigate the effect of exercise on the meat quality traits of the Longissimus thoracis et lumborum (LTL) muscle. There were no treatment effects on Warner-Bratzler shear force (WBSF), myofibril and sarcoplasmic protein solubility, denaturation or sarcomere length. With exercise the initial pH of the muscle was lower and the rate of pH fall to rigor was faster compared to controls. Exercise caused increased purge and meat fluid had a lower osmolarity, magnesium, potassium and sodium concentration. Proteolysis of desmin occurred after day 3 and vinculin on day 7 of ageing with exercise. It was concluded that exercise caused changes in the distribution of ions and the proteolysis of muscle proteins that reduced the ability of the muscle to bind or hold water.     

Where is the Anion Extraction Going?

Reactive extraction processes represent efficient and smart technologies for separation and concentration of metal ions in solution, which are frequently used in industry. Despite the importance of anions in biology, medicine, environment and industry, practical examples of anion extraction are relatively limited compared to metal ion separation. Anion extraction processes are mainly based on the nonspecific ion pair formation with hydrophobic ammonium cations. In this case the phase transfer of anions is dominated by their lipophilicity. The reasons for this situation are closely connected with the specific features of anions in contrast to cations. Novel approaches for specific binding and selective transport of anionic components are based both on the better understanding of the biological role of anions and on the possibilities of supramolecular chemistry to create receptor architectures with complementary binding modes for anions. In the given review the authors discuss present research tendencies and application possibilities of new extractant types for separation and concentration of anionic species in solution.