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Are polyelectrolyte dendrimers stimuli responsive?

Giupponi, Giovanni; Buzza, D. Martin A.; Adolf, Dave B.


Giovanni Giupponi

Dave B. Adolf


Using a molecular dynamics and mean field theory approach which explicitly accounts for free ions, we study the conformation of polyelectrolyte dendrimers for different generation numbers, spacer lengths, charge distributions and ionic strengths. We find that, due to local charge neutrality, electrostatic interactions are strongly screened under all the conditions studied (including salt free conditions). This leads to the cores of the dendrimers being filled and to a very weak dependence of dendrimer conformations on ionic strength. These results are contrary the predictions of Debye−Hückel theory and highlight the limitations of Debye−Hückel theory in modeling the properties of highly charged macromolecular systems. However, our simulations suggest that some responsiveness to ionic strength may be recovered for more weakly charged dendrimers.

Journal Article Type Article
Publication Date Aug 7, 2007
Journal Macromolecules
Print ISSN 0024-9297
Electronic ISSN 1520-5835
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 40
Issue 16
Pages 5959-5965
APA6 Citation Giupponi, G., Buzza, D. M. A., & Adolf, D. B. (2007). Are polyelectrolyte dendrimers stimuli responsive?. Macromolecules, 40(16), 5959-5965. doi:10.1021/ma070609l
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