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Effective Charge of Adsorbed Poly(amido amine) Dendrimers : Transition from Heterogeneous to Homogeneous Charge Distribution

Title data

Popa, Ionel ; Papastavrou, Georg ; Borkovec, Michal:
Effective Charge of Adsorbed Poly(amido amine) Dendrimers : Transition from Heterogeneous to Homogeneous Charge Distribution.
In: Macromolecules. Vol. 43 (December 2010) Issue 2 . - pp. 1129-1136.
ISSN 0024-9297
DOI: https://doi.org/10.1021/ma902325b

Official URL: Volltext

Abstract in another language

The surface charge density of sulfate latex particles with adsorbed poly(amido amine) (PAMAM) dendrimers of generation 10 was determined from direct force measurements with atomic force microscopy (AFM). The variation of the surface charge density with the adsorbed amount can be related to the effective charge of the dendrimers in the adsorbed state. Two regimes were identified. In the first regime, the adsorbed amount is low and the surface charge distribution strongly heterogeneous. This regime is characterized by an effective charge of about 45 elementary charges. The second regime corresponds to a saturated layer with higher adsorbed amount and a more homogeneous charge distribution. This regime is characterized by a higher effective charge of about 93, which is comparable to the value expected from Poisson-Boltzmann theory. The transition between these two regimes is located in a narrow region just after the charge reversal point.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Physical Chemistry II
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors > Chair Physical Chemistry II - Univ.-Prof. Dr. Andreas Fery
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Physical Chemistry II
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 12 Sep 2017 10:47
Last Modified: 12 Sep 2017 10:47
URI: https://eref.uni-bayreuth.de/id/eprint/39563