The Effect of Counterion Valence on the pH Responsiveness of Polyelectrolyte Dendrimer Structure: A Small Angle Neutron Scattering Study

Butler, Paul D.; Chen, Wei-Ren; Herwig, Kenneth W.; Hong, Kunlun; Liu, Yun; Porcar, L.; Smith, Gregory Scott

doi:10.1063/1.3358349

Title: The Effect of Counterion Valence on the pH Responsiveness of Polyelectrolyte Dendrimer Structure: A Small Angle Neutron Scattering Study

Journal Article · Mon Mar 01 00:00:00 EST 2010 · The Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.3358349· OSTI ID:984767

Butler, Paul D. ^[1];

^[1];

^[1]; Liu, Yun ^[2]; Porcar, L. ^[2];

^[1]

ORNL
National Institute of Standards and Technology (NIST)

By quantitatively analyzing small angle neutron scattering (SANS) results of protonated generation 5 (G5) polyamidoamine (PAMAM) dendrimers dissolved in aqueous solution, we have accurately determined their structural characteristics. The investigation has focused on understanding the effect of counterion valency on the counterion association and its effect to the intra-molecular density profile. It is found that the association of extremely large amount of divalent counterions significantly reduces the effective charge of a dendrimer molecule. Similar to the results of G4, we found that there is still an intra-molecular structure transition in G5 when DCl is used to protonate a dendrimer. However, surprisingly, no discernible transition of the density distribution profile is observed for the G5 dendrimer charged by D2SO4. We have attributed the reason to the more effective screening effect of divalent counterions.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 984767

Journal Information:: The Journal of Chemical Physics, Vol. 132, Issue 12; ISSN 0021-9606

Country of Publication:: United States

Language:: English

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Title: The Effect of Counterion Valence on the pH Responsiveness of Polyelectrolyte Dendrimer Structure: A Small Angle Neutron Scattering Study

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