Papers by Author: Young Soo Yoon

Abstract: Several titanate powders (Al2TiO5, SrTiO3, etc.) were synthesized by an ethylene glycol solution route. Titanium isopropoxide and nitrate salts were dissolved in stoichiometric proportions in liquid-type ethylene glycol without any precipitation. The parent precursor sols were dried to porous gels, and then the gels were calcined and crystallized. All synthesized titanate powders had stable crystallization behavior at low temperature and high specific surface area after a simple ball-milling process. A three-component PZT (Pb(Zr0.52·Ti0.48)O3) powder was also synthesized successfully by the ethylene glycol method. In this study, the characteristics of the multi-component titanate powders by the ethylene glycol method are examined.

Abstract: Amplification of the p53 gene using the polymerase chain reaction (PCR) was performed in a silicon-based micro-PCR chip. Metal deposition, photolithography, and anodic bonding were used to fabricate micro-PCR chip and a thermal cycling system with dual peltier devices and PID controller was integrated for controlling the cycling temperature of the PCR mixture. We have demonstrated the amplification of exon 6(182bp) of the p53 gene with the micro-fabricated PCR chip. Temperature control accuracy was within
0.5  . The amplified p53 genes using both conventional PCR and micro fabricated PCR were analyzed using micro-capillary electrophoresis. The PCR performance strongly depends on the cycling temperature, and the Si surface treatment with protein. The micro-PCR products show higher specificity than those of conventional PCR products, and this is attributed to the uniform temperature distribution of the PCR mixture in micro-chip.