“…In our case, during the precipitation at room temperature, pH oscillated in the range of 6.8–7.0 while at 50°C was around 7.5–7.8. In a similar manner, pH of the reaction media showed to have crucial effect on the mechanism of formation of the precipitates and the microstructure of the final products in the work of Hashempour et al . devoted to thermochemical co‐precipitation of W–Cu nanocomposite powders.…”
The aim of this work was to investigate the influence of precipitation parameters on the morphology of obtained thulium oxide powders. Tm2O3 precursor powders were synthesized by precipitation method using 0.1–0.25M water solutions of thulium nitrate and 1.5M ammonium hydrogen carbonate water solution as a precipitation agent. The processes were conducted at different temperatures (25–50°C). The result showed that the morphology of the obtained thulium oxide (Tm2O3) powders depends both on the molar concentration of thulium nitrate and the temperature of precipitation. Small, round, loosely agglomerated Tm2O3 nanoparticles were obtained after air calcination of precursor precipitated at room temperature with the use of 0.1M thulium nitrate solution.
“…In our case, during the precipitation at room temperature, pH oscillated in the range of 6.8–7.0 while at 50°C was around 7.5–7.8. In a similar manner, pH of the reaction media showed to have crucial effect on the mechanism of formation of the precipitates and the microstructure of the final products in the work of Hashempour et al . devoted to thermochemical co‐precipitation of W–Cu nanocomposite powders.…”
The aim of this work was to investigate the influence of precipitation parameters on the morphology of obtained thulium oxide powders. Tm2O3 precursor powders were synthesized by precipitation method using 0.1–0.25M water solutions of thulium nitrate and 1.5M ammonium hydrogen carbonate water solution as a precipitation agent. The processes were conducted at different temperatures (25–50°C). The result showed that the morphology of the obtained thulium oxide (Tm2O3) powders depends both on the molar concentration of thulium nitrate and the temperature of precipitation. Small, round, loosely agglomerated Tm2O3 nanoparticles were obtained after air calcination of precursor precipitated at room temperature with the use of 0.1M thulium nitrate solution.
“…Thus, the Cu and Cr ions could quickly form a Cu–Cr hydroxide precipitation. Meanwhile, the effective addition of the surfactant CTAC allowed the solution to reach the critical micelle concentration (CMC) and provided Cu and Cr ions with positive charges and the head of the micelle region with a negative charge, thus forming sphere-like nanoparticles in the process [39, 40]. Moreover, the addition of hydrazine is another crucial step to prevent the Ostwald ripening process by a reasonable degree [41].…”
Rechargeable lithium–oxygen batteries have been considered as a promising energy storage technology because of their ultra-high theoretical energy densities which are comparable to gasoline. In order to improve the electrochemical properties of lithium–oxygen batteries (LOBs), especially the cycling performance, a high-efficiency cathode catalyst is the most important component. Hence, we aim to demonstrate that CuCr2O4@rGO (CCO@rGO) nanocomposites, which are synthesized using a facile hydrothermal method and followed by a series of calcination processes, are an effective cathode catalyst. The obtained CCO@rGO nanocomposites which served as the cathode catalyst of the LOBs exhibited an outstanding cycling performance for over 100 cycles with a fixed capacity of 1000 mAh g−1 at a current density of 200 mA g−1. The enhanced properties were attributed to the synergistic effect between the high catalytic efficiency of the spinel-structured CCO nanoparticles, the high specific surface area, and high conductivity of the rGO.
Electronic supplementary materialThe online version of this article (10.1007/s40820-017-0175-z) contains supplementary material, which is available to authorized users.
“…Unfortunately, above pH 5 precipitation was observed in the solution and it continued to pH 7.5. Molecules have a neutral charge there and this could be the reason of the precipitation (Hashempour et al 2010). Therefore, determination of spectroscopic parameters for these two forms was not possible.Fig.…”
Two new somatostatin analogs with a characteristic part of the sequence -c(Cys-Phe-Trp-Lys-Thr-Cys)- and with two histidine and two aspartic acid moieties in their structures were synthesized and analyzed in terms of their coordination abilities with copper (II) ions. Both peptides bind Cu(II) effectively. Ligands form 4N complexes with binding mode in a basic range of pH. But in spite of very similar sequences of the two peptides a significant difference in the effectiveness of the binding of copper (II) ions was observed.
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