Volume 72, Number 5, December 2005
|Page(s)||844 - 850|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||03 November 2005|
Adsorption energies of single charged polymers
DEAS and Department of Physics, Harvard University Cambridge, MA 02138, USA
2 Center for Nanoscience, LMU München - Geschwister-Scholl Platz 1 80799 München, Germany
3 Physik Department, TU München - 85748 Garching, Germany
Accepted: 6 October 2005
We peel off cationic and anionic polyelectrolytes from different substrates (cationic, hydrophobic and metallic) with the atomic force microscope (AFM). By varying the salt concentration, the measured plateau forces can be separated into electrostatic and non-electrostatic contributions to the adsorption energy. Surprisingly, i) the non-electrostatic contribution dominates even for highly charged substrates, and ii) hydrophobic substrates act like negatively charged surfaces. In the theoretical modeling the surface-induced charge regulation of the polymers has to be included.
PACS: 87.16.Ac – Theory and modeling; computer simulation / 87.16.Dg – Membranes, bilayers, and vesicles / 87.68.+z – Biomaterials and biological interfaces
© EDP Sciences, 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.