Multilayers of an Fe(II)-polyelectrolyte-amphiphile complex (Fe-PAC) were investigated simultaneously by energy-dispersive X-ray reflectivity and in-plane diffraction at the bending-magnet beamline at BESSY II. By recording spectra between room temperature and about 348 K with a time resolution of about 60 s, two phase transitions were identified and the respective activation energies were determined. Owing to a fixed geometrical set-up, an energy-dispersive experiment is suitable for measuring X-ray reflectivity and in-plane X-ray diffraction of thin organic films simultaneously. Installed at a bending magnet at BESSY II and using an energy range of 4 < E < 25 keV, both reflectivity and diffraction spectra can be collected within about 60 s. The performance is demonstrated by temperature- and time-resolved measurements of the phase transition behaviour of multilayers of an Fe-PAC deposited on a silicon support by means of the Langmuir-Blodgett (LB) technique. By measuring the X-ray reflectivity while increasing the temperature, it is shown that the original LB phase is not stable and transforms irreversibly into a liquid-crystalline (LC)-like phase at about 318 K. At the same temperature the in-plane diffraction signal vanishes reversibly, reflecting rotational disorder of the hexagonal arrangement of amphiphilic chains. Its activation energy is determined to be about 1.3 eV. At about 338 K a second irreversible phase transition occurs to another LC phase with smaller vertical layer spacing. This transition is reversible between 329 K and 338 K.
%0 Journal Article
%1 Bodenthin2002
%A Bodenthin, Y
%A Grenzer, J
%A Lauter, R
%A Pietsch, U
%A Lehmann, P
%A Kurth, DG
%A Mohwald, H
%C 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK
%D 2002
%I BLACKWELL MUNKSGAARD
%J JOURNAL OF SYNCHROTRON RADIATION
%K dgkurth
%N Part 4
%P 206-209
%T Temperature- and time-resolved X-ray scattering at thin organic films
%V 9
%X Multilayers of an Fe(II)-polyelectrolyte-amphiphile complex (Fe-PAC) were investigated simultaneously by energy-dispersive X-ray reflectivity and in-plane diffraction at the bending-magnet beamline at BESSY II. By recording spectra between room temperature and about 348 K with a time resolution of about 60 s, two phase transitions were identified and the respective activation energies were determined. Owing to a fixed geometrical set-up, an energy-dispersive experiment is suitable for measuring X-ray reflectivity and in-plane X-ray diffraction of thin organic films simultaneously. Installed at a bending magnet at BESSY II and using an energy range of 4 < E < 25 keV, both reflectivity and diffraction spectra can be collected within about 60 s. The performance is demonstrated by temperature- and time-resolved measurements of the phase transition behaviour of multilayers of an Fe-PAC deposited on a silicon support by means of the Langmuir-Blodgett (LB) technique. By measuring the X-ray reflectivity while increasing the temperature, it is shown that the original LB phase is not stable and transforms irreversibly into a liquid-crystalline (LC)-like phase at about 318 K. At the same temperature the in-plane diffraction signal vanishes reversibly, reflecting rotational disorder of the hexagonal arrangement of amphiphilic chains. Its activation energy is determined to be about 1.3 eV. At about 338 K a second irreversible phase transition occurs to another LC phase with smaller vertical layer spacing. This transition is reversible between 329 K and 338 K.
@article{Bodenthin2002,
abstract = {Multilayers of an Fe(II)-polyelectrolyte-amphiphile complex (Fe-PAC) were investigated simultaneously by energy-dispersive X-ray reflectivity and in-plane diffraction at the bending-magnet beamline at BESSY II. By recording spectra between room temperature and about 348 K with a time resolution of about 60 s, two phase transitions were identified and the respective activation energies were determined. Owing to a fixed geometrical set-up, an energy-dispersive experiment is suitable for measuring X-ray reflectivity and in-plane X-ray diffraction of thin organic films simultaneously. Installed at a bending magnet at BESSY II and using an energy range of 4 < E < 25 keV, both reflectivity and diffraction spectra can be collected within about 60 s. The performance is demonstrated by temperature- and time-resolved measurements of the phase transition behaviour of multilayers of an Fe-PAC deposited on a silicon support by means of the Langmuir-Blodgett (LB) technique. By measuring the X-ray reflectivity while increasing the temperature, it is shown that the original LB phase is not stable and transforms irreversibly into a liquid-crystalline (LC)-like phase at about 318 K. At the same temperature the in-plane diffraction signal vanishes reversibly, reflecting rotational disorder of the hexagonal arrangement of amphiphilic chains. Its activation energy is determined to be about 1.3 eV. At about 338 K a second irreversible phase transition occurs to another LC phase with smaller vertical layer spacing. This transition is reversible between 329 K and 338 K.},
added-at = {2011-01-12T11:47:09.000+0100},
address = {35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK},
affiliation = {Pietsch, U (Reprint Author), Univ Potsdam, Inst Phys, D-14415 Potsdam, Germany. Univ Potsdam, Inst Phys, D-14415 Potsdam, Germany. Max Planck Inst Colloids \& Interfaces, D-14476 Golm, Germany.},
author = {Bodenthin, Y and Grenzer, J and Lauter, R and Pietsch, U and Lehmann, P and Kurth, DG and Mohwald, H},
biburl = {https://www.bibsonomy.org/bibtex/2f99b7ded959b9f5889776bbb6908abf4/lctm},
doc-delivery-number = {567DZ},
interhash = {83b757450f8a76e320b26015f4dda6d0},
intrahash = {f99b7ded959b9f5889776bbb6908abf4},
issn = {0909-0495},
journal = {JOURNAL OF SYNCHROTRON RADIATION},
journal-iso = {J. Synchrot. Radiat.},
keywords = {dgkurth},
keywords-plus = {ENERGY-DISPERSIVE REFLECTOMETER; MULTILAYERS; STEARATE; LIQUID},
language = {English},
month = JUL,
number = {Part 4},
number-of-cited-references = {21},
pages = {206-209},
publisher = {BLACKWELL MUNKSGAARD},
subject-category = {Instruments \& Instrumentation; Optics; Physics, Applied},
times-cited = {17},
timestamp = {2011-01-12T11:47:09.000+0100},
title = {Temperature- and time-resolved X-ray scattering at thin organic films},
type = {Proceedings Paper},
unique-id = {ISI:000176471300004},
volume = 9,
year = 2002
}