Pinazo A, Pérez L, Lozano M, Angelet M, Infante M R, Vinardell M P, Pons R
Institut d'Investigacions Quimiques i Ambientals de Barcelona, IIQAB, CSIC, c/ Jordi Girona 18-26, 08034 Barcelona, Spain.
J Phys Chem B. 2008 Jul 24;112(29):8578-85. doi: 10.1021/jp802193p. Epub 2008 Jun 26.
In this paper, we report on the study of aqueous solution and aggregation properties of diacyl Lysine surfactant salts with several surfactant counterions at a fixed hydrophobic chain length. They present a critical micellar concentration nearly independent of the counterion. The area per surfactant molecule is around 1.3 nm (2) also independent of the counterion. We have also studied the dry state crystallization of these surfactant salts. We show that small counterion systems tend to form bicontinuous cubic structures and that the increase in counterion size tends to form lamellar structures. We have compared this behavior with the dry state crystallization of the diacyl Lysine surfactants as a function of hydrophobic chain length. For long hydrophobic chains, the crystal structure is lamellar, while for intermediate, length is cubic. Among the structures studied, the one with the shortest chain length crystallizes in a hexagonal inverse phase.
在本文中，我们报告了在固定疏水链长度下，具有几种表面活性剂抗衡离子的二酰基赖氨酸表面活性剂盐的水溶液和聚集性质的研究。它们呈现出几乎与抗衡离子无关的临界胶束浓度。每个表面活性剂分子的面积约为1.3 nm²，同样与抗衡离子无关。我们还研究了这些表面活性剂盐的干燥态结晶。我们表明，小抗衡离子体系倾向于形成双连续立方结构，而抗衡离子尺寸的增加倾向于形成层状结构。我们将这种行为与作为疏水链长度函数的二酰基赖氨酸表面活性剂的干燥态结晶进行了比较。对于长疏水链，晶体结构是层状的，而对于中等长度，则是立方的。在所研究的结构中，链长度最短的一种以六方反相结晶。
