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$MgB_2$ bulk의 미세구조와 임계전류밀도에 미치는 polyacrylic acid doping 효과
이승묵,황수민,이창민,주진호,김찬중,Lee, S.M.,Hwang, S.M.,Lee, C.M.,Joo, J.,Kim, C.J. 한국초전도학회 2010 Progress in superconductivity Vol.11 No.2
We fabricated the polyacrylic acid (PAA)-doped $MgB_2$ bulks and characterized their lattice parameters, actual C substitutions, microstructures, and critical properties. The boron (B) powder was mixed with PAA using N,N-dimethylformamide as solvent and then the solution was dried out at $200^{\circ}C$ and crushed. The C treated B powder and magnesium powder were mixed and compacted by uniaxial pressing at 500 MPa, followed by sintering at $900^{\circ}C$ for 1 h in high purity Ar atmosphere. We observed that the PAA doping increased the MgO amount but decreased the grain size, a-axis lattice constant, and critical temperature ($T_c$), which is indicative of the C substitution for B sites in $MgB_2$. In addition, the critical current density ($J_c$) at high magnetic field was significantly improved with increasing PAA addition: at 5 K and 6.6 T, the $J_c$ of 7 wt% PAA-doped sample was $6.39\;{\times}\;10^3\;A/cm^2$ which was approximately 6-fold higher than that of the pure sample ($1.04\;{\times}\;10^3\;A/cm^2$). This improvement was probably due to the C substitution and the refinement of grain size by PAA doping, suggesting that PAA is an effective dopant in improving $J_c$(B) performance of $MgB_2$.
수수 종자의 펩타이드 프로파일링을 위한 SELDI-TOF-MS의 Q10 프로테인 칩의 희석배수 최적화
박준영(Park, J.Y.),남윤정(Nam, Y.J.),유성녕(Yoo, S.Y.),김현희(Kim, H.H.),박소현(Park, S.H.),김지영(Kim, J.Y.),먁말자브 우간자야(Myagmarjav, U.),변진우(Byun, J.W.),김아람(Kim, A.R),황수민(Hwang, S.M.),이용호(Lee, Y.H.),홍선희(Hong, S.H.),Jung 한국토양비료학회 2011 한국토양비료학회 학술발표회 초록집 Vol.2011 No.10