Electrochemical Studies on the Methylviologen-Sodium Dodecyl Sulfate Solution in the Presence of $MgCl_2$

염화마그네슘 존재하의 메틸비올로겐-도데실황산나트륨 용액의 전기화학적 연구

  • Ko, Young Chun (School of Chemical and Energy/Environmental Engineering, Daebul University) ;
  • Chung, Keun Ho (Department of Chemistry Education, Chonnam National University)
  • 고영춘 (대불대학교 화학환경에너지공학부) ;
  • 정근호 (전남대학교 화학교육과)
  • Received : 1997.08.21
  • Published : 1998.06.01

Abstract

Electrochemical behaviours on 1.0 mM methylviologen ($MV^{2+}$) in 100 mM NaCl+27 mM $MgCl_2$ solution, without and with sodium dodecyl sulfate (SDS), were studied. The intersection of two lines on ${\Delta}E_p$ (the difference between the anodic, $E_{pa}$, and the cathodic, $E_{pc}$, peak potentials) of the first and second redox waves vs. -log[SDS] plot was determined as a critical micelle concentration (CMC). When $Mg^{2+}$ was added, the effective access of $MV{\cdot}^+$ to the glassy carbon electrode surface became possible and the formation of micelles was retarded.

100 mM NaCl+27 mM $MgCl_2$ 용액에서, 도데실황산나트륨 (SDS)의 유무에 따른 1.0 mM 메틸비올로겐 ($MV^{2+}$)의 전기화학적 거동을 연구하였다. ${\Delta}E_p$(산화와 환원 봉우리전위 값의 차이) 대 - log[SDS]로 도시한 그림에서 두 선의 교차점을 임계미셀농도 (CMC)로 결정하였다. $Mg^{2+}$가 첨가되면, 유리탄소전극에 대한 효과적인 $MV{\cdot}^+$의 접근이 가능해지고 미셀형성도 지연되었다.