Yuan Fei, Zhang Xinjun, Yang Miao, Wang Wei, Minch Britt, Lieser Günter, Wegner Gerhard
The Key Laboratory of Functional Polymer Materials and Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China.
Max-Planck-Institute for Polymer Research, Ackermannweg 10, Postfach 3148, D-55128, Mainz, Germany.
Soft Matter. 2007 Oct 16;3(11):1372-1376. doi: 10.1039/b709705k.
Experimental evidence for a topological transformation of aggregates of an amphiphilic codendrimer from sphere to button structures a toroidal intermediate is reported. The aggregates are produced in organic solvents which consist of water droplets covered by a continuous monolayer of the codendrimer. The transformations occur at a mean curvature which is equal to the spontaneous curvature. At this point, the contribution to Helfrich's bending free energy essentially comes from the Gaussian curvature of the continuous monolayers. Therefore, an aggregate of lower genus will transform to another aggregate of higher genus to further minimize the total free energy.
报道了两亲性树枝状共聚物聚集体从球形到纽扣结构拓扑转变存在环形中间体的实验证据。聚集体在有机溶剂中形成，由被树枝状共聚物连续单层覆盖的水滴组成。转变发生在平均曲率等于自发曲率处。此时，对赫尔弗里希弯曲自由能的贡献主要来自连续单层的高斯曲率。因此，低亏格的聚集体将转变为另一个高亏格的聚集体，以进一步最小化总自由能。
