Micelle Formation of Dodecanoic Acid with Alkali Metal Counterions

被引:1
|
作者
Matsuoka, Keisuke [1 ]
Sato, Aiko [1 ]
Ogawa, Yukino [1 ]
Okazaki, Kana [1 ]
Yada, Shiho [2 ]
Yoshimura, Tomokazu [2 ]
机构
[1] Saitama Univ, Fac Educ, Lab Chem, 255 Shimo Okubo,Sakura Ku, Saitama, Saitama 3388570, Japan
[2] Nara Womens Univ, Fac Sci, Dept Chem, Kitauoyanishi, Nara 6308506, Japan
关键词
micelle; dodecanoic acid; surfactant; alkali metal; solubilization; SODIUM DODECYL-SULFATE; ANGLE SCATTERING DATA; AQUEOUS-ELECTROLYTE SOLUTIONS; SURFACE-TENSION; MICELLIZATION; SOLUBILIZATION; CARBOXYLATE; THERMODYNAMICS; ADSORPTION; INTERFACES;
D O I
10.5650/jos.ess23086
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
JAPAN Abstract: Alkali series with different atomic numbers affect the physicochemical properties of aqueous solutions. The micellar properties of aqueous solutions of dodecanoate as surfactants were measured by changing the counterions (C12-Na, C12-K, C12-Rb, and C12-Cs). A plot of Krafft temperature vs. alkali metal atomic number showed a downward convex curve, with its minimum temperature (20celcius) in the C12-K system. By contrast, a plot of the critical micelle concentration (CMC) vs. alkali metal atomic number exhibited an upward convex curve with the maximum CMC (25.6 mmol L-1) at C12-K. Furthermore, the minimum surface tension (gamma(min)) of the solution at the CMC increased with increasing atomic number (C12Na approximate to C12-K < C12-Rb < C12-Cs). The size of the dodecanoate micelles decreased with increasing atomic number. The ionization degree of the micelles also increased with increasing atomic number of the alkali metal. Small-angle X-ray scattering (SAXS) measurements revealed that alkali dodecanoate micelles formed spherical to ellipsoidal structures. In addition, micelles from the shell region showed large electrostatic repulsion, judging from the shape of the spectrum in the higher Q(-1) region. From the measurement results of the solubilization of naphthalene into the micelles, the size of the micelles corresponded to the maximum solubilization quantity of naphthalene.
引用
收藏
页码:831 / 837
页数:7
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