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  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 45-48 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Several titanate powders (Al2TiO5, SrTiO3, etc.) were synthesized by an ethylene glycolsolution route. Titanium isopropoxide and nitrate salts were dissolved in stoichiometric proportionsin liquid-type ethylene glycol without any precipitation. The parent precursor sols were dried toporous gels, and then the gels were calcined and crystallized. All synthesized titanate powders hadstable crystallization behavior at low temperature and high specific surface area after a simpleball-milling process. A three-component PZT (Pb(Zr0.52·Ti0.48)O3) powder was also synthesizedsuccessfully by the ethylene glycol method. In this study, the characteristics of the multi-componenttitanate powders by the ethylene glycol method are examined
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of sol gel science and technology 16 (1999), S. 29-35 
    ISSN: 1573-4846
    Keywords: PLT films ; surface roughness ; ion beam ; optical band gap
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract In order to study optical and electrical properties of (Pb1-xLax)TiO3 (PLT) films with varying La concentration, the PLT films were deposited by sol-gel process. X-ray diffraction revealed that a pseudocubic phase of the PLT film became dominant with increasing La concentration due to decrease of lattice constant of c-axis. Three-dimensional atomic force microscopy images showed that the grain size and root mean square surface roughness decreased by addition of La. The optical band gap of the PLT films became wider when Pb was substituted with La. The addition of La increased the transparency of the PbTiO3 film and shifted the threshold for initiation of absorption to shorter wavelength. Hysteresis loops of the PLT films showed that remanent polarization and coercive field decreased with increasing La concentration. In addition, we modified the surface of the PLT film with La concentration of 5% using a keV oxygen ion beam at different doses. The optical band gap of the PLT film was changed by the oxygen ion beam irradiation although the XRD patterns and the transmittance values were not significantly changed. In measuring AFM images of the surface of modified PLT film, significant changes of the grain shape and size were not found. Moreover, polarization and dielectric constant were not changed after oxygen ion irradiation. These results suggested that addition of La could affect the optical and electrical properties of the PbTiO3 and PLT films and that surface modification by oxygen ion beam modification with 1 keV energy can change the surface property but not bulk property.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 1241-1244 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Amplification of the p53 gene using the polymerase chain reaction (PCR) was performed ina silicon-based micro-PCR chip. Metal deposition, photolithography, and anodic bonding were usedto fabricate micro-PCR chip and a thermal cycling system with dual peltier devices and PID controllerwas integrated for controlling the cycling temperature of the PCR mixture. We have demonstrated theamplification of exon 6(182bp) of the p53 gene with the micro-fabricated PCR chip. Temperaturecontrol accuracy was within[removed info]0.5[removed info]. The amplified p53 genes using both conventional PCR andmicro fabricated PCR were analyzed using micro-capillary electrophoresis. The PCR performancestrongly depends on the cycling temperature, and the Si surface treatment with protein. Themicro-PCR products show higher specificity than those of conventional PCR products, and this isattributed to the uniform temperature distribution of the PCR mixture in micro-chip
    Type of Medium: Electronic Resource
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