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Abstract: SiO2 hollow spheres with movable Fe3O4 core were obtained by exposing the pre-synthesized Fe3O4\SiO2 particles (with an adsorption interlayer of ethylene glycol) under the irradiation of electron beam inside transmission electron micrograph (TEM). In the formation process, the evaporation of adsorbed ethylene glycol and the evolution of amorphous SiO2 layer played important roles, and that should be attributed to the high temperature and trapped charges induced by the irradiation of electron beam. This work provided a new route to obtain particles with movable core structure and extended the applications of electron beam. [Copyright &y& Elsevier]

Abstract: Zirconium particles with irregular morphology and broad size distribution were uniformly coated by spherical α-Fe2O3 crystal grain via a facile route without polymer or surfactant as directing agents. The synthesized α-Fe2O3/Zr composite particles were characterized by X-ray diffraction, scanning electron microscopy, energy dispersion X-ray, UV–vis spectroscopy and Raman spectroscopy. The synthesis mechanism could be explained by cooperated heterogeneous nucleation and solid state transformation reaction. The combustion properties of α-Fe2O3/Zr composite particles were investigated. Compared with Zr particles, the combustion lasting time decreased from 16s of Zr particles to 0.13s of α-Fe2O3/Zr composite particles, and the top point of temperature reached in combustion increased from 2004°C of Zr particles to 2378°C of α-Fe2O3/Zr particles. [Copyright &y& Elsevier]

Abstract: CdS x Se1−x (0≤ x ≤1) nanorods with diameter of 10–20nm and length up to 100–150nm were successfully synthesized via a solvothermal route. It was found that the CdS x Se1−x nanorods could be obtained at a temperature as low as 120°C and the size distribution of the nanorods did not change with temperature and composition. A thin layer of CdS was detected beside the CdS x Se1−x products and proposed to act as crystal seeds in the incorporating process of CdS x Se1−x , thus decreasing the reaction temperature effectively. The exploration of ultraviolet–visible (UV–vis) absorption properties of the CdS x Se1−x samples confirmed that the band gaps of the CdS x Se1−x nanocrystals could be easily tuned via the control of composition, which may indicate its wide application in many fields. [Copyright &y& Elsevier]

Co 3 O 4 nanowires, with the length of tens of micrometers and the width of several hundred nanometers, were produced by a hydrothermal treatment and a post-anneal process. X-ray diffraction (XRD) result showed that the Co 3 O 4 nanowires belong to cubic crystal system. Scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) analysis indicated that the Co 3 O 4 nanowires, composed by single crystalline nanoparticles, were of polycrystalline nature. On the basis of time-dependent experiments, methanamide-assisted hydrolysis and subsequent dissolution–recrystallization process were used to explain the precursors' formation process of the polycrystalline Co 3 O 4 nanowires. The TGA experiments showed that the as-obtained Co 3 O 4 nanowires can catalyze the thermal decomposition of ammonium perchlorate (AP) effectively. [ABSTRACT FROM AUTHOR]