Comprehensive study on critical micellar concentrations of SDS in acetonitrile–water solvents

Comprehensive study on critical micellar concentrations of SDS in acetonitrile–water solvents
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乙腈水溶剂中SDS临界胶束浓度的综合研究

DOI:
10.1002/elps.201500553
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发表时间:
2016
期刊:
影响因子:
2.9
通讯作者:
Trapp O
Trapp O
中科院分区:
生物学3区
文献类型:
--
作者:
Šteflová J;Štefl M;Walz S;Knop M;Trapp O

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CMC是表面活性剂的基本特性之一,它的测定对于详细了解胶束的形成至关重要。本研究采用毛细管电泳法和荧光相关光谱分析两种独立的实验技术测定了ACN存在下十二烷基硫酸钠的临界胶束浓度。然而,在以ACN为有机改性剂的溶液中,有关十二烷基硫酸钠胶束化的研究很少,而且文献不一致。ACN含量在0-50%v/v范围内进行了测量。在ACN含量高达10%v/v时,CMC低于水溶液,而增加ACN含量会导致CMC显著增加。在ACN浓度为35%v/v的情况下观察到了胶束的形成,这与文献中的大多数报道相反。根据FCS实验的结果,我们能够证实ACN的存在导致了胶束尺寸随着十二烷基硫酸钠浓度的增加而逐渐增大。同时,我们证明了在ACN等有机改性剂含量较高的情况下,用经典的电导法测定CMC不能得到可靠的结果。
The CMC is one of the fundamental characteristics of surfactants and its determination is crucial for detail understanding of micelles formation. In this study the CMC of SDS in presence of ACN was determined by two independent experimental techniques, capillary electrophoresis and fluorescence correlation spectroscopy (FCS). Yet, studies of SDS micellization in solutions containing ACN as organic modifier are sparse and inconsistent in literature. The measurements were performed for various ACN contents in the range of 0–50% v/v. At ACN contents of up to 10% v/v the CMC is lower when compared to the aqueous solution, while increasing ACN content causes a significant increase of the CMC. Formation of micelles was observed up to ACN concentrations of 35% v/v, which is in contrast to most of the reports in literature. Based on the results of the FCS experiments, we were able to confirm that presence of ACN causes a gradual increase of the size of the micelles with increasing concentration of SDS. Simultaneously, we proved that the classical conductivity approach for the determination of the CMC does not yield reliable results in the presence of higher content of an organic modifier such as ACN.
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