Hongbo Liu

Preparation of Hydrotalcites Derived Ni/Co/Cu/Fe Nanocomposite Oxides and their Catalytic Activities for Thermal Decomposition of Ammonium Perchlorate

Ni/Co/Cu/Fe nano-composite oxides (Ni/Co/Cu/Fe–NCOs) were prepared by calcination of Ni/Co/Cu/Fe hydrotalcites (Ni/Co/Cu/Fe–HTs) precursors. Ni/Co/Cu/Fe–NCOs were used as new catalysts on improving thermal decomposition of ammonium perchlorate (AP). Their catalytic activities were investigated using DTA and TG–MS. The results revealed that Ni/Co/Cu/Fe–NCOs exhibited NiO and spinel phase with high specific surface areas of 90–120 m2 g–1. They have homogenous particles with average crystallite size in the range of 50–60 nm. The thermal decomposition process of AP can be accelerated by the addition of Ni/Co/Cu/Fe–NCOs. Ni/Co/Cu/Fe–NCOs achieved the purpose of improving thermal decomposition of AP based on the presence of superoxide ion (O2–) on the surface of Ni/Co/Cu/Fe–NCOs.

Synthesis and Characterization of Zn/Ni/Fe Magnetic Composite Oxide Nanotubes Assembled in Porous Anodic Alumina

Zn/Ni/Fe composite oxide nanotubes were synthesized using a 1:2:1 molar precursor solution of Zn(NO3)2, Ni(NO3)2 and Fe(NO3)3 and anodic aluminum oxide as the substrate. The length of the nanotubes is about 1 to 5 μm, and the outer diameter is 200 nm. The samples were characterized using scanning electron microscope, X-ray diffraction, transmission electron microscope and vibrating sample magnetometer. Magnetization measurement showed the coercivity and largest magnetocrystalline magnetization of Zn/Ni/Fe oxide nanotubes were ∼60 Oe and 0.6 emu/g. Zn/Ni/Fe oxide nanotubes could be easily prepared using this method, and might be applied as catalysts, magnetic materials or microwave absorbers.

Preparation of UV-Curable Nanocomposite Varnish with High Wear Resistance

To enhance the interfacial interaction in silica nanoparticles filled polymer composites , nano-SiO2 gel was prepared by a sol-gel route, and then it was modified in situ through a reaction of silane coupling agent with hydroxyl on the surface of SiO2. The modified nano-SiO2 gel was added to the system of light-cured varnish to prepare UV light-cured nanocomposite varnish. The structures and properties of varnish were studied using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and film performance test. The results showed that the modified nano-SiO2 was well dispersed in the varnish. After introduction of modified nano-SiO2, the fracture morphology of varnish film showed a corrugated shape, indicating the ductile fracture. The wear resistance of the varnish film increased by 50%, the coefficient of static friction reduced about 15%, and gloss improved to some extent.