1318-21-4Relevant academic research and scientific papers
Facile synthesis of oxygen defective yolk-shell BiO2-:X for visible-light-driven photocatalytic inactivation of Escherichia coli
Sun, Hongli,Yip, Ho Yin,Jiang, Zhifeng,Ye, Liqun,Lo, Irene M. C.,Wong, Po Keung
, p. 4997 - 5005 (2018/03/26)
Oxygen defective yolk-shell BiO2-x spheres are successfully synthesized by a facile solvothermal method for the first time. The variations between the diffusion rate of the core and the formation rate of the shell, which are caused by the temperature gradient originating from the heating rate, result in the formation of BiO2-x spheres with different interior structures. The as-synthesized yolk-shell BiO2-x spheres possess distinctive oxygen vacancies, which are demonstrated by electron paramagnetic resonance and X-ray photoelectron spectral analyses. The oxygen vacancies with a high affinity for molecular oxygen, and the enhanced light absorption ability resulting from the multiple reflections of the incident light within the interior voids, play key roles in the photocatalytic bacterial inactivation. Scavenger studies indicate that O2- and H2O2 are the major reactive species guaranteeing the prominent oxidation ability toward the bacterial cells. This study would not only provide direct evidence for the oxygen vacancy promoted photocatalytic bacterial inactivation, but also shed light on the design of highly efficient photocatalysts with intricate yolk-shell structures.
Nonadditive linearity in the chemostimulating effect of activator oxides + dlient compositions on GaAs thermal oxidation
Penskoi,Pshestanchik,Kostryukov,Kuznetsova,Agapov,Mittova
, p. 186 - 191 (2008/10/09)
The chemostimulation efficiency of the activators Sb2O 3 and Bi2O3 in compositions with a diluent (Al2O3) is a linear function of activator percentage over a wide range of temperatures. This function is not, however, additive to the thicknesses achieved in the presence of individual components. The percentage of the activator elements in the resulting oxide layers coincides with that in the initial compositions in the linear region and differs from it in the nonadditivity region. Thermal analysis in combination with X-ray powder diffraction showed that Al2O3 alters the temperature range and character of the intrinsic transformations of activator oxides.
Low-temperature synthesis of nanosized bismuth ferrite by soft chemical route
Ghosh, Sushmita,Dasgupta, Subrata,Sen, Amarnath,Maiti, Himadri Sekhar
, p. 1349 - 1352 (2008/10/09)
The present research describes a simple low-temperature synthesis route of preparing bismuth ferrite nanopowders through soft chemical route using nitrates of Bismuth and Iron. Tartaric acid is used as a template material and nitric acid as an oxidizing agent. The synthesized powders are characterized by X-ray diffractometry, thermogravimetry and differential thermal analysis, infrared spectroscopy, and scanning electron microscopy. The particle size of the powder lies between 3 and 16 nm. In the process, phase pure bismuth ferrite can be obtained at a temperature as low as 400°C, in contrast to 550°C for coprecipitation route. On the other hand, we find that, like solid state reaction route, Pechini's autocombustion method of synthesis generates a lot of impurity phases along with bismuth ferrite.
