Form fluctuations of carbosilane dendrimers in dilute solution: a study using neutron spin echo spectroscopy

Starlike dendrimers in solutions: Structural properties and internal dynamics

“…However, the interpretation of their NSE data in terms of form fluctuations would imply not only a well-defined incompressible surface formed by the end groups but also a low viscosity liquidlike interior. Thus, it cannot be excluded that the extrafast relaxation process found by Stark et al 9 is due to internal density fluctuations and not to shape fluctuations.…”

“…diffusion was observed in the whole q range of the NSE experiment. Stark et al 9 attributed their findings to the fact that the end groups in their particular dendrimers are coated by the end groups due to the unfavorable interaction of the end groups with the core, thus forming FIG. 8.…”

“…Experimental studies on the internal dynamics in solutions include predominantly NMR investigations [29][30][31][32][33][34] and some experiments using neutron spin-echo ͑NSE͒ spectroscopy. 8,9 The latter are summarized in more detail below. There are also a few computer simulations 16,17,[35][36][37] and theoretical studies 24,27,[38][39][40][41] addressing this topic.…”

“…Stark et al 9 performed NSE experiments on carbosiloxane dendrimers with generations g = 1, 2, and 3 with perfluorinated end groups in perfluorohexane. Deviations from simple c.m.…”

“…These findings are a consequence of the well-defined globular shape of the starburst dendrimers exhibiting very high polymer concentrations in the interior. Stark et al 9 conducted NSE experiments on carbosilane dendrimers with perfluorinated end groups. The authors observed an extrafast relaxation process leading to deviations from translational diffusive behavior and interpreted their results in terms of shape fluctuations, i.e., relaxation of ripples on the dendrimer surface.…”