• Journal of Electrochemical Science and Technology
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• 제9권1호
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• pp.69-77
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• 2018

Aluminum electrodeposition was carried out in dimethylsulfone ($DMSO_2$) baths containing 6.2-28.3 mol% $AlCl_3$ at 403 K. The electrochemically active species for Al electrodeposition in $DMSO_2$ baths were investigated. Electrochemical behavior of the electrolyte and the deposition mechanism were studied via cyclic voltammetry (CV). Properties of the deposits were assessed by scanning electron microscopy with energy-dispersive X-ray spectroscopy and X-ray diffraction. In addition, structures of the ionic complexes formed with aluminum in the bath were characterized by $^{27}Al$ nuclear magnetic resonance (NMR) spectroscopy. NMR spectra revealed that all baths contained two ionic species: $AlCl_4{^-}$ and $[Al(DMSO_2)_3]^{3+}$. Al electrodeposited when the $[Al(DMSO_2)_3]^{3+}$ concentration was the highest (23.3 mol% $AlCl_3$) exhibited fine grain sizes, relatively smooth surfaces, and high purities.

• Journal of Korean Society for Atmospheric Environment
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• 제18권E2호
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• pp.107-120
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• 2002

Dimethyl sulfide (DMS) is the major sulfur gas released from the ocean. The atmospheric DMS released from the ocean is oxidized mainly by hydroxyl (OH) radical during the day and nitrate (NO$_3$) radical at night to form sulfur dioxide (SO$_2$) as well as other stable products. The oxidation mechanism of DMS via OH has been known to proceed by two channels; abstraction and addition channels. The major intermediate product of the addition channel has been known to be dimethylsulfoxide (DMSO) based on laboratory chamber studies and field experiments. However, a branching ratio for DMSO formation is still uncertain. The reaction of DMSO with OH ultimately produces SO$_2$and dimethylsulfone. The major product of the abstraction channel has known to be SO$_2$from laboratory chamber studies. But overall conversion efficiency for DMS to SO$_2$from DMS oxidation is still inconsistent in the literature. Based on laboratory and field studies, the conversion efficiency from the abstraction channel is likely to be greater than 0.5, while that from the addition channel is likely to be greater than 0.6. Overall conversion efficiency from DMS to SO$_2$might be greater than 0.5 based on the above two values in the remote marine boundary layer (MBL). This high efficiency in the remote MBL is supported by strong coupling between DMS and SO$_2$measurements with high temporal resolution.

• Nuclear Engineering and Technology
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• 제9권4호
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• pp.203-210
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• 1977

디메틸썰폭사이드를 표지보조제로 사용하여 방사면역측정용 $^{125}$/I 표지인슈린을 효과적으로 만들 수 있었다. 디메틸썰폭사이드 조금을 통상의 표지반응 혼합물에 첨가하여 반응시간을 조절하여 보았더니 표지반응속도는 약간 느렸으나 이렇게 하여 얻은 표지인슈린은 항체와의 결합능이 좋았으며 표준곡선을 점시했을 때 큰 구배를 보였다. 표지반응수율도 반응시간을 1분으로 늘림에 따라 약 30%로 늘어났다. 평균 항체결합능(B/F)의 증가는 일정항체 희석비율하에서 표지보조제없이 표지한 인슈린을 쓴 때가 1.5인데 반해 표지보조제를 쓴 경우는 2.5로서 약 70%의 향상을 보였다. 핵자기공명분광법으로 표지혼합물에 첨가한 디메틸썰폭사이드는 클로라민티에 의해 디메틸썰폰으로 산화된다는 것을 확인하였다. Stagg등의 결과와 대략 같은 이 실험결과를 디메틸썰폭사이드와 인슈린분자 중의 유황결합이 클로라민티에 의해 경쟁적 산화를 받는 것으로 보고 이를 토의하였다.