Papers by Keyword: Nanosize

Abstract: The transparent nanosized TiO₂ film was fabricated by a layer-by-layer assembly method starting from the highly dispersed anatase oppositely charged TiO₂ nanoparticles without using anypoly electrolytes. The positively charged TiO₂ nanoparticles (ca.7 nm) and negatively charged TiO₂ nanoparticles (ca.7 nm) were synthesized by a subsequently hydrothermal process. Field-emission scanning electron microscopy, UV-vis transmittance spectra and Contact angle measurement were employed to characterize TiO₂films.By the treatment of 500°C for 2hrs, the nanostructured TiO₂ film showed a water contact angle of below 10°andthe relative transmittance to quartz glass of over 90%.

Abstract: Polygonum minus or ‘kesum’ is a traditional Malaysian plant used as flavoring agent and recommended for digestive disorders as well as stomach pain. The leaves are often eaten fresh as a vegetable (salad and ulam), especially among the Malay communities for preventive health care. The physicochemical characterization of nanosize of Polygonum minus in wet mill and dry mill was influenced by ball milling process using planetary ball mill. Particle size analysis employing photon correlation spectroscopy was carried out to record the effect of milling parameters on the particle size produced. Fourier Transform Infra-Red (FTIR) spectrum was recorded for functional groups analysis. The result showed that after ball milling, the average size of particles was reduced while FTIR results showed the peak at region of 1,600-1,500 cm^-1 is due to the stretching vibration of carbonyl group and 1300-1,000 cm¹ indicate a stretching of C-H group.

Abstract: nanoZrO₂ ceramic powders have excellent properties in many field. In order to obtain nanoZrO₂ powder with excellent properties, the study of preparation methods become a hotspot. The nanoZrO₂ powders new preparation technology from cheap raw materials is target of this paper. nanoZrO₂ powers were preparated from ZrOCl₂ and NaCO₃ as raw material. The optimum technology parameters were determined as follow, namely at 40°C, C (_ZrOCl2) =0.4mol/L, C (_NaCO3) =1.0mol/L, 2% the surface activity agent. nanoZrO₂ powders preparated were characterized by XRD, TEM and Electron Diffraction . The results show that the ZrO₂ powders prepared are crystal and the sizes are nanometer. The ZrO₂ average sizes were calculated with the scherrer formula. The nanoZrO₂ sizes change with temperature was discussed. The result is ageerment with that calculated with the scherrer formula.