Institut für Physikalische Chemie, Georg-August-Universität Göttingen , Tammannstraße 6, D-37077 Göttingen, Germany.
Institut für Theoretische Physik, Georg-August-Universität Göttingen , Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany.
Langmuir. 2017 Feb 28;33(8):2017-2026. doi: 10.1021/acs.langmuir.6b04473. Epub 2017 Feb 16.
Planet-satellite nanostructures from RAFT star polymers and larger (planet) as well as smaller (satellite) gold nanoparticles are analyzed in experiments and computer simulations regarding the influence of arm number of star polymers. A uniform scaling behavior of planet-satellite distances as a function of arm length was found both in the dried state (via transmission electron microscopy) after casting the nanostructures on surfaces and in the colloidally dispersed state (via simulations and small-angle X-ray scattering) when 2-, 3-, and 6-arm star polymers were employed. This indicates that the planet-satellite distances are mainly determined by the arm length of star polymers. The observed discrepancy between TEM and simulated distances can be attributed to the difference of polymer configurations in dried and dispersed state. Our results also show that these distances are controlled by the density of star polymers end groups, and the number of grabbed satellite particles is determined by the magnitude of the corresponding density. These findings demonstrate the feasibility to precisely control the planet-satellite structures at the nanoscale.
实验和计算机模拟分析了 RAFT 星型聚合物以及较大（行星）和较小（卫星）金纳米粒子形成的卫星-行星纳米结构，研究了星型聚合物支臂数目对其的影响。在干燥状态下（通过透射电子显微镜）和胶体分散状态下（通过模拟和小角 X 射线散射），当使用 2 臂、3 臂和 6 臂星型聚合物时，均发现卫星-行星距离与支臂长度的函数呈均匀缩放关系。这表明卫星-行星距离主要取决于星型聚合物的支臂长度。TEM 和模拟距离之间的观察到的差异可归因于干燥和分散状态下聚合物构型的差异。我们的结果还表明，这些距离由星型聚合物末端基团的密度控制，并且捕获的卫星颗粒的数量由相应密度的大小决定。这些发现表明，在纳米尺度上精确控制卫星-行星结构是可行的。
