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- 저자 : Dae Wung Yoo (검색결과 2 건)
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Improvement of Mechanical Properties of Lightweight Ceramics with the Addition of Alumina Fiber
Kim, Geun Hee,Pee, Jae Hwan,Kim, Yoo Jin,Cho, Woo Seok,Kim, Dae Wung Trans Tech Publications, Ltd. 2014 Key engineering materials Vol.608 No.-
<P>Lightweight ceramics have a low density, which leads to a decrease in strength and toughness. In the development of lightweight ceramics, high-strengthening technology is necessary. Alumina fiber was mixed with raw materials for the purpose of producing high-strength lightweight ceramics. After adding alumina fiber at 1, 3, and 5wt% and sintering at 1300<SUP>°</SUP>C, we found that strength and toughness increased in proportion to the amount. Instead of the high melting temperature of alumina fiber, it is reacted with matrix and generated mullite phase. And lots of alumina fiber remains in the matrix, thereby allowing improvements in strength and toughness. When alumina fiber was not added, we found a low density of 1.35~1.80 g/m<SUP>3</SUP>, along with low values for strength and toughness at 30~60MPa and 0.7~1.2 MPa m<SUP>1/2</SUP> respectively. With 1wt% addition of alumina fiber, we obtained a higher strength of 92MPa at 1300<SUP>°</SUP>C, which is close to the strength of general white porcelains at 112MPa.</P>
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오옥두,유대웅,임상무 ( Ok Doo Awh,Dae Wung Yoo,Sang Moo Im ) 대한핵의학회 1997 핵의학 분자영상 Vol.31 No.4
This study was designed to prospect the 'In-labelled paclitaxel as tumor imaging agent. In order to provide a taxol molecule with a functional group which is able to chelate In-lll, taxol-DTPA conjugate and 2-hemisuccinyltaxol were synthesized by esterification of taxol at C-2 on C-13 carbon with DTPA anhydride and succinic anhydride, respectively. Synthesis yield of the taxol derivatives was 34% for taxol- DTPA and 80% for 2'-hemisuccinyltaxol. Cytotoxicity of the taxol derivatives were measured by MTT method toward cell lines HT29, B16, P388, and CT26. The cytotoxic activities of the taxol derivatives were maintained, although less active than taxol. Radiolabelling of the taxol derivatives were proceeded directly with InCh or indirectly with In-citrate(ligand-exchange method). The ligand-exchane methocl was not suitable because some precipitat:es appeared during the reaction. On the contrary, by direct radiolabelling methnd, we were able to obtain taxol DTPA--'In in 100% radiochemical yield. However, 2'-hemisuccinyltaxol was not labellecl by both methods. Yield and radiochemiral purity of the radiolabelled com- pound were determined by HPI.C, paper chromatography and instant thin layer chromatography. Taxol-DTPA-In was characterized to be hydrophilic by lipophi- licity test, and nearly non-adhesive to HT29, E316, P388, and CT26 by cell hinding affinity test. Binding affinity of the taxol-DTPA-'In complex to serum proteins was also examined by protein precipitation with 30% trichloroacetic acid. The results showed that 309o of the taxol-DTPA-'In complex binds with serum proteins.
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