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Chemical pulsed-force microscopy of single polyethyleneimine molecules in aqueous solution

Title data

Schneider, M. ; Zhu, M. ; Papastavrou, Georg ; Akari, S. ; Möhwald, Helmuth:
Chemical pulsed-force microscopy of single polyethyleneimine molecules in aqueous solution.
In: Langmuir. Vol. 18 (January 2002) Issue 3 . - pp. 602-606.
ISSN 1520-5827
DOI: https://doi.org/10.1021/la0113116

Official URL: Volltext

Abstract in another language

Using scanning probes modified with amino- and methyl-terminated groups in situ offers the possibility of scanning force microscopy (SFM) imaging with enhanced chemical sensitivity. The sample, a positively charged high molecular weight polyethyleneimine (branched), is adsorbed on the negatively charged mica surface to achieve an arrangement of single polyethyleneimine (PEI) molecules. Chemical imaging of individual PEI molecules is revealed by differences in adhesion and contact stiffness obtained from the pulsed-force mode measurements by SFM. We conclude that electrostatic and hydrophobic forces are responsible for the adhesion contrast in the system. The measurements also show a pH dependence based on the type of interaction between the modified tip and the substrate. We demonstrate that the chemical pulsed force microscopy is a suitable tool for the investigation of strongly charged polymers on an oppositely charged surface.

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: No
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 13 Sep 2017 09:19
Last Modified: 13 Apr 2018 08:48
URI: https://eref.uni-bayreuth.de/id/eprint/39593