Abstract
The effect of temperature on the cmc of sodium N-lauroyl-N-methyl taurate was examined. The cmc values were found to be decreased initially but increased further with the increase of temperature. From the temperature dependence of cmc, various thermodynamic properties were calculated. The effects of various electrolytes on the cmc of sodium N-lauroyl-N-methyl-taurate were also examined. The free energy of hydrophobic bond formation and the degree of dissociation of the micelles were calculated from log cmc vs. log counter ion concentration plots. The ${\Delta}H_m$ values were decreased with increasing the temperature and changed their signs from plus to minus at $40^{\circ}C{\sim}50^{\circ}C$. The ${\Delta}G_m$ values were decreased with the increase of electrolyte concentration and temperature.
Sodium N-lauroyl-N-methyl taurate의 cmc에 대한 온도효과를 검토하였다. cmc값들은 처음 $20^{\circ}C{\sim}40^{\circ}C$의 온도 범위에서는 감소하다가 더욱 온도가 증가되면 다시 증가하는 경향이었다. cmc에 대한 온도의 의존성으로부터 여러가지 열역학적 파라미터들(${\Delta}H_m$, ${\Delta}G_m$, ${\Delta}S_m$)을 산출하였다. Sodium N-lauroyl-N-methyl taurate의 cmc에 대한 여러 전해질들의 첨가효과를 또한 검토하였고, 소수성결합 형성에너지 및 미셀의 해리도를 log cmc와 log conc.의 곡선으로부터 산출하였다. ${\Delta}H_m$값들은 온도가 증가함에 따라 감소하였고, $40^{\circ}C{\sim}50^{\circ}C$의 온도범위에서 부호가 양에서 음으로 변하였다. ${\Delta}G_m$값들은 전해질 농도 및 온도가 증가할수록 감소하였다.
