Dumbbell-Shaped Polyelectrolyte Brushes Studied by Depolarized Dynamic Light Scattering

作者：Hoffmann Martin; Lu Yan; Schrinner Marc; Ballauff Matthias^*; Harnau Ludger

来源：Journal of Physical Chemistry B, 2008, 112(47): 14843-14850.

DOI：10.1021/jp806765y

We present the synthesis and comprehensive characterization of dumbbell-shaped polyelectrolyte brushes (DPB). The core of these particles consists of poly(methyl methacrylate) (PMMA) and poly(styrene) onto which a dense brush shell of poly(styrene sulfonate) is grafted. The morphology of DPB particles is studied in solution by cryogenic-transrnission electron microscopy. We demonstrate that well-defined DPB are generated that react to external stimuli such as surfactant and salt concentration. The rotational diffusion and collective relaxations of the DPB particles were monitored by depolarized dynamic light scattering (DDLS). Here we found a new relaxation mode in the DDLS-signal that can be ascribed to collective fluctuations of the polyelectrolyte layer affixed to the surface of the dumbbells.

• 出版日期2008-11-27
• 单位中国科学院金属研究所