Controlled Self-Assembly of Asymmetric Dumbbell-Shaped Rod Amphiphiles: Transition from Toroids to Planar Nets
Controlled Self-Assembly of Asymmetric Dumbbell-Shaped Rod Amphiphiles: Transition from Toroids to Planar Nets
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DOI：
10.1021/ma071511
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发表时间：
2007-10
期刊：
影响因子：
5.5
通讯作者：
Eunji Lee;Y. Jeong;Jung‐Keun Kim;Myongsoo Lee
中科院分区：
文献类型：
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作者：
Eunji Lee;Y. Jeong;Jung‐Keun Kim;Myongsoo Lee
我们在这里报告了一系列不对称哑铃形杆两亲物的合成和自组装，该两亲物在刚性杆段的一端包含亲水性低聚醚树枝，在另一端包含疏水性烷基树枝，疏水性烷基链的长度范围从乙基到十四烷基有系统的变化。观察到这些棒状两亲物在水溶液中自组装成纳米级超分子聚集体，其随着疏水性烷基链长度的变化而显着变化，如低温透射电子显微镜（cryo-TEM）实验所表征的那样。基于乙基(f烷基/EO=0.45)的棒状两亲物呈现球形胶束结构，而具有己基(f烷基/EO=0.71)的两亲物呈现环形结构。进一步将烷基长度增加到癸基（f烷基/EO = 0.97）和十四烷基（f烷基/EO = 1.23）分别导致二维网络和囊泡的形成。值得注意的是，托罗伊...
We report here the synthesis and self-assembly of a series of asymmetric dumbbell-shaped rod amphiphiles containing hydrophilic oligoether dendrons at one end and hydrophobic alkyl dendrons at the other end of the stiff rod segment with systematic variation in the length of the hydrophobic alkyl chain ranging from ethyl to tetradecyl groups. These rod amphiphiles were observed to self-assemble, in aqueous solution, into nanoscopic supramolecular aggregates that change significantly on variation in the length of hydrophobic alkyl chain, as characterized by cryo-transmission electron microscopy (cryo-TEM) experiments. The rod amphiphile based on the ethyl group (falkyl/EO = 0.45) exhibits a spherical micellar structure, while the amphiphile with the hexyl group (falkyl/EO = 0.71) shows a toroidal structure. Further increasing the alkyl length to decyl (falkyl/EO = 0.97) and tetradecyl (falkyl/EO = 1.23) gives rise to the formation of two-dimensional networks and vesicles, respectively. Remarkably, the toroi...