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

Titelangaben

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

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Abstract

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.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Physikalische Chemie II
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Ehemalige Professoren > Lehrstuhl Physikalische Chemie II - Univ.-Prof. Dr. Andreas Fery
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Physikalische Chemie II
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Ehemalige Professoren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 540 Chemie
Eingestellt am: 12 Sep 2017 10:52
Letzte Änderung: 12 Sep 2017 10:52
URI: https://eref.uni-bayreuth.de/id/eprint/39565