Key Laboratory of Colloid and Interface Chemistry and Key Laboratory of Special Aggregated Materials, Ministry of Education, Shandong University , Jinan, Shandong 250100, People's Republic of China.
Langmuir. 2016 Aug 23;32(33):8366-73. doi: 10.1021/acs.langmuir.6b01596. Epub 2016 Aug 11.
Precise control of phase structure transition for the synthesis of multi-dimensional soft materials is a fascinating target in amphiphilic molecule self-assembly. Here, we demonstrate a spontaneous formation of a closely packed lamellar phase consisting of uni- and multi-lamellar vesicles through the incorporation of a small amount of an extractant, di(2-ethylhexyl)phosphoric acid (DEHPA), into the highly swollen, planar lamellar phase of a non-ionic tetraethylene glycol monododecyl ether (C12EO4) surfactant in water. It is figured out that the introduction of negative membrane charges results in the electrostatic repulsion among the lamellae, which suppresses the Helfrich undulation and induces a phase structure transition from planar lamellae to closely packed vesicles. Our results provide important insight into amphiphilic molecule self-assembly, where additives and pH can satisfy the opportunities for the precise tuning of the lamellar structures, which makes a way for the development of lamellar soft materials.
精确控制相结构转变对于合成多维软材料是两亲分子自组装中一个引人入胜的目标。在这里，我们通过在高度溶胀的平面层状相中引入少量萃取剂二(2-乙基己基)磷酸（DEHPA），展示了一种通过自组装形成由单双层囊泡组成的紧密堆积层状相的自发过程。非离子型四乙二醇单十二醚（C12EO4）表面活性剂在水中。结果表明，引入负膜电荷会导致层之间的静电排斥，从而抑制赫夫里奇弯曲，并诱导从平面层到紧密堆积囊泡的相结构转变。我们的结果为两亲分子自组装提供了重要的见解，其中添加剂和 pH 值可以满足精确调整层状结构的机会，为层状软材料的发展开辟了道路。
