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Synchrotron x-ray diffraction and reflection studies of a polymacromonomer monolayer at the air-water interface: Transition from aligned single molecules to homogeneous layer

Title data

Ahrens, Heiko ; Papastavrou, Georg ; Schmidt, Manfred ; Helm, Christiane A.:
Synchrotron x-ray diffraction and reflection studies of a polymacromonomer monolayer at the air-water interface: Transition from aligned single molecules to homogeneous layer.
In: The Journal of Physical Chemistry B. Vol. 108 (May 2004) Issue 22 . - pp. 7080-7091.
ISSN 1520-5207
DOI: https://doi.org/10.1021/jp037352n

Official URL: Volltext

Abstract in another language

Monolayers of polymacromonomers with poly(vinyl)pyridine side chains of different lengths, polyPVP(20.8) and polyPVP(46.7), are studied at the air/water interface. Combination of reflection data and diffraction peaks allows the establishment of a structural model. In the expanded phase at pressures below approximately 15 mN/m, the side chains are adsorbed to the air/water interface, causing polymer backbone stretching and alignment of the single molecules. The in-plane peaks are due to the lateral electron density variation above and below the adsorption layer. The diameter of the flattened cylindrical molecules corresponds to twice the contour length of the side chains (25 and 12.5 nm, respectively) and decreases on monolayer compression by approximately 20, due to side chain desorption. Additionally, side chain desorption causes monolayer thickening. Above the phase transition, the lateral order disappears. Obviously, the side chains of adjacent molecules mix and the monolayer is homogeneous.

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 08:59
Last Modified: 13 Sep 2017 08:59
URI: https://eref.uni-bayreuth.de/id/eprint/39588