Yin Shouchun, Wang Chao, Song Bo, Chen Senlin, Wang Zhiqiang
Key Laboratory of Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China.
Langmuir. 2009 Aug 18;25(16):8968-73. doi: 10.1021/la900628k.
We report herein the self-organization of the polymerizable bolaamphiphile (noted, L-Asp-DA) that contains a diacetylene group and two L-aspartic groups. We found that L-Asp-DA can self-organize into stable fiberlike nanostructures at the mica-water interface. The micellar nanostructures of L-Asp-DA can be polymerized both in the bulk solution and in the film on UV irradiation, and the nanostructures of the L-Asp-DA micelles at the mica-water interface can be maintained after polymerization. The polymerized L-Asp-DA nanostructures can go through blue-red transition upon pH stimuli arising from the transformation of polydiacetylene skeleton. In addition, the concentration (above cmc) of L-Asp-DA has a great effect on the nanostructures. At a concentration of 3.2x10(-4) mol/L, L-Asp-DA can self-organize into stable fiberlike nanostructure at the mica-water interface, while cylindrical nanostructures self-organize at a concentration of 6.0x10(-4) mol/L. This work may provide a new approach for designing and fabricating molecular assemblies with controlled sizes and shapes, leading to the development of novel functional polymer nanostructure materials.
我们在此报告含二乙炔基和两个L-天冬氨酸基团的可聚合双亲型分子（记为L-Asp-DA）的自组装情况。我们发现L-Asp-DA能在云母-水界面自组装成稳定的纤维状纳米结构。L-Asp-DA的胶束纳米结构在紫外线照射下，既能在本体溶液中也能在薄膜中发生聚合，且聚合后云母-水界面处L-Asp-DA胶束的纳米结构得以保持。聚合后的L-Asp-DA纳米结构会因聚二乙炔骨架的转变在pH刺激下发生蓝-红转变。此外，L-Asp-DA的浓度（高于临界胶束浓度）对纳米结构有很大影响。在浓度为3.2×10⁻⁴ mol/L时，L-Asp-DA能在云母-水界面自组装成稳定的纤维状纳米结构，而在浓度为6.0×10⁻⁴ mol/L时自组装成圆柱状纳米结构。这项工作可能为设计和制造尺寸与形状可控的分子组装体提供一种新方法，从而推动新型功能聚合物纳米结构材料的发展。
