Polymers 2011, 3(2), 812-819; doi:10.3390/polym3020812

Counterion Condensation and Effective Charge of PAMAM Dendrimers

email, email, email and * email
Received: 24 March 2011; Accepted: 14 April 2011 / Published: 27 April 2011
(This article belongs to the Special Issue Polyelectrolytes)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: PAMAM dendrimers are used as a model system to investigate the effects of counterion condensation and the effective charge for spherical polyelectrolytes. Because of their amino groups, PAMAM dendrimers are weak polyelectrolytes. Lowering the pH results in an increasing protonation of the amino groups which is monitored via the proton chemical shifts of the adjacent CH2 groups. The effective charge is determined from a combination of diffusion and electrophoresis NMR. The fraction of the charges, which are effective for the interaction with an external electric field or other charges, decreases with increasing generation (size) of the dendrimers.
Keywords: effective charge; dendrimers; spherical polyelectrolytes; electrophoresis NMR
PDF Full-text Download PDF Full-Text [359 KB, uploaded 27 April 2011 12:53 CEST]

Export to BibTeX |

MDPI and ACS Style

Böhme, U.; Klenge, A.; Hänel, B.; Scheler, U. Counterion Condensation and Effective Charge of PAMAM Dendrimers. Polymers 2011, 3, 812-819.

AMA Style

Böhme U, Klenge A, Hänel B, Scheler U. Counterion Condensation and Effective Charge of PAMAM Dendrimers. Polymers. 2011; 3(2):812-819.

Chicago/Turabian Style

Böhme, Ute; Klenge, Anja; Hänel, Brigitte; Scheler, Ulrich. 2011. "Counterion Condensation and Effective Charge of PAMAM Dendrimers." Polymers 3, no. 2: 812-819.

Polymers EISSN 2073-4360 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert