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Form fluctuations of carbosilane dendrimers in dilute solution: a study using neutron spin echo spectroscopy |
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| Authors: | B?Stark C?Lach B?Farago H?Frey C?Schlenk |
| Institution: | (1) Institute of Macromolecular Chemistry, Albert-Ludwigs-University, Freiburg, Germany;(2) Institute Laue Langevin, Grenoble, France;(3) Institute of Physics, Albert-Ludwigs-University, Freiburg, Germany;(4) Institute of Physics, Ilmenau Technical University, Germany; |
| Abstract: | A series of carbosilane dendrimers with perfluorinated end groups has been prepared. The structure of these molecules in dilute solution is studied using small angle neutron scattering. For generations g<3 we find a non-spherical shape of the particles and a tendency for aggregation. This result is supported by the analysis of the diffusion coefficient obtained from photon correlation spectroscopy. The overall shape of the molecules is that of a core-shell particle. The generation 4 molecule is obtained as a compact sphere. Neutron spin echo spectroscopy reveals a relaxation time which is attributed to the form fluctuations of this particle. |
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