S ong 12 y p tan y h taufiq yap and z zainal 12 1

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Unformatted text preview: most promising high-conducting electrolyte, alternative to the commercially used yttria-stabilized zirconia. Ca-doped ceria is considered among the top variants of doped ceria systems. In this present work, crystalline fluorite -like structure of Ca-doped CeO2 compounds, denoted as Ce1-xCaxO2-δ (0.05 ≤ x ≤ 0.2), were prepared via mechanochemical synthesis route. The synthesis routed involves mechanochemical reaction of starting materials of CeO 2 as well as 2+ 4+ CaO and CaCO3 as the Ca substituting source for Ce . In mechanochemical reaction, fine-grained powders with uniform grain size distribution were obtained. CaO -substituted ceria was found to be more promising in terms of phase stability, where all solid solutions were obtained in single phase at lower sintering temperature and duration, compared to that substitut ed with CaCO3. For the purpose of comparison, calcium-doped ceria samples were also prepared by conventional solid state method. The single phase compounds were further characterized by employing d ifferential thermal analysis/thermogravimetry (DTA/TG) and X-ray diffractometry (XRD). The morphology and microstructure of sintered pellets were studied using scanning electron microscopy (SEM). The electrical conductivity of calcium doped ceria compounds were investigated in air as a function of temperature between 50 and 800 °C using AC impedance spectroscopy. 1 MAT-O10 OPTICAL PROPERTIES AND BIOLOGICAL CELLS INTERACTION OF ZINC SELENIDE NANOPARTICLES 1 See Y. Lee, Siew T. Eng, Sabar D. Hutagalung, Ishak Mat and Ahmad F. Ismail 1 1 2 2 School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia 2 Advanced Medical and Dental Institute (AMDI), Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia E-mail: [email protected] Semiconductor nanoparticles are very attractive as their electronic structure and optical properties depend sensitively on their size. These tiny particles can be specifically attached to biological materials such as cell, proteins and nucleic acids, where they show promise for labeling and imaging biological molecules in vitro and in vivo. In this paper presented a great potential of z...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.

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