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Charge regulation effects on electrostatic patch-charge attraction induced by adsorbed dendrimers

Title data

Popa, Ionel ; Papastavrou, Georg ; Borkovec, Michal:
Charge regulation effects on electrostatic patch-charge attraction induced by adsorbed dendrimers.
In: Physical Chemistry Chemical Physics. Vol. 12 (March 2010) Issue 18 . - pp. 4863-4871.
ISSN 1463-9084
DOI: https://doi.org/10.1039/b925812d

Official URL: Volltext

Abstract in another language

A multi-particle colloidal probe technique based on the atomic force microscope (AFM) was used to measure the interaction forces between individual charged latex particles with adsorbed cationic poly(amido amine) (PAMAM) dendrimers. The forces near the isoelectric point (IEP) were found to be attractive and stronger than van der Waals interactions. These additional attractions can be rationalized semi-quantitatively with a patch-charge model, which is derived from Debye-Huckel theory. However, the model predicts a larger decay constant for the attractive interaction than observed experimentally. The deviation is probably due to the disordered liquid-like structure of the experimentally investigated system and the finite size of the interacting regions. The amplitude of the attractive interaction is estimated correctly by the patch-charge model including its dependence on the ionic strength and dendrimer generation. The experimental force curves are situated between predictions for constant charge and constant potential boundary conditions. We conclude that the observed additional attractive forces are of electrostatic origin, and that charge regulation effects may play an important role.

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 10:52
Last Modified: 12 Sep 2017 10:52
URI: https://eref.uni-bayreuth.de/id/eprint/39565