Light scattering, dendrimers

Schematic representations, like those shown in the Scheme 1, are very useful to indicate the chemical composition of the various species and to discuss the interaction between the various building blocks. Furthermore, as one can understand from the representations shown in Figures 9 and 10, the species with high nuclearity exhibit a ttu-ee-dimensional branching structure of the type of those shown by otherwise completely different dendrimers based on organic components. Therefore, endo- and exo-receptor properties can be expected, which are currently under investigation. Furthermore, aggregation of decanuclear complexes has also been demonstrated by dynamic light-scattering and conductivity experiments. Systematic studies on aggregation properties have, however, not been performed yet.

Structural verification is based on viscosity data (indicating Einstein spheroid characteristics), elemental analyses, light-scattering experiments, and direct observation of individual dendrimers by electron microscopy. The self-limiting molar-mass ranges correspond to approximately 38 branch-cell propagations (three tiers) around a germanium initiator core. Furthermore, analysis of molecular... 

The development of amphiphilic and aggregation behaviour as a fiinction of dendrimer generation of PS-t/enstudied with several diflferent techniques the amphiphilic character at a toluene-water interface was investigated with conductivity measurements, and at a water-air interface with monolayer experiments. Dynamic light scattering (DLS) and transmission electron microscopy (TEM) were used to examine the aggregates formed by the different generations in aqueous solutions, while the critical association concentrations were determined with the pyrene-probe luminescence technique. 

Static and dynamic light scattering studies by Milhem have shown that G4 PAMAM dendrimers do not exhibit intermolecular aggregation in aqueous solution at concentrations up to 7%w/w at pH 10.5, or even when fully unionized at pH 14. 

Standards commonly employed [5] to calibrate SEC columns do not have a well-defined size. Carefully characterized spherical solutes in the appropriate size range are therefore of considerable interest. The chromatographic behavior of carboxylated starburst dendrimers — characterized by quasi-elastic light scatter-... 

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