@article{ReichePietschFinketal.1992, author = {Reiche, J{\"u}rgen and Pietsch, Ullrich and Fink, Hans-Peter and Lemmetyinen, Helge}, title = {A comparison fo x-ray methods for structure refinement of Langmuir-Blodgett multilayers}, year = {1992}, abstract = {The possibilities and limits of structure refinement of Langmuir-Blodgett films by means of symmetrical reflection of X- rays are described using the example of a stearic acid multilayer. Three different techniques for the determiantion of the electron density profile from reflectivity data are compared; a Fourier method, a Patterson method, and model calculations. The important role of the a priori information for finding the besft structure model is outlined.}, language = {en} } @article{Reiche1996, author = {Reiche, J{\"u}rgen}, title = {Antiphase domains in Langmuir-Blodgett films}, year = {1996}, abstract = {For bilayer stacks of non-centrosymmetrical molecules, formed by the Langmuir-Blodgett (LB) technique (Y deposition), 00l peaks for the bilayer period are usually observed in the X-ray specular reflectivity curve, in this study, we show that the introduction of stacking disorder at lower transfer ratios and the subsequent partial repair of defects by a parallel shift of oppositely oriented molecules into the vacancies may result in the formation of antiphase domains and in an increase in the average monolayer symmetry followed by quenching of the bilayer peaks. The X-ray reflectivity data, obtained for multilayers of penta-alkynes, are used to demonstrate this real structural effect, which is expected to be of general importance for X-ray and neutron reflectivity data reduction and for the structural modelling of multilayers.}, language = {en} } @article{Reiche1995, author = {Reiche, J{\"u}rgen}, title = {Antiphasen : Dom{\"a}nen in Langmuir-Blodgett Schichten}, year = {1995}, language = {de} } @article{Reiche1995, author = {Reiche, J{\"u}rgen}, title = {Antiphasen domains in Langmuir-Blodgett films}, year = {1995}, language = {en} } @article{ReicheBarberkaKnochenhaueretal.1994, author = {Reiche, J{\"u}rgen and Barberka, Thomas Andreas and Knochenhauer, Gerald and Woolley, Martin and Pietsch, Ullrich}, title = {Comprehensive structure investigation and computer modelling of perfluorododecanoic acid multilayers formed by in-vacuo thermal evaporation}, year = {1994}, language = {en} } @article{ReicheJanietzBarberkaetal.1995, author = {Reiche, J{\"u}rgen and Janietz, Dietmar and Barberka, Thomas Andreas and Hofmann, Dieter and Brehmer, Ludwig}, title = {Comprehensive structure investigation of Langmuir-Blodgett films of disc-shaped molecules}, year = {1995}, abstract = {The structure of mono- and multilayers of amphiphilic disc-shaped pentaynes wa inbestigated by Brewsterangle microscopy, X-ray specular reflection and grazing incidence diffraction (GID). X-ray specular reflection experiments confirm the "edge on" arrangement of the molecular discs. The molecular modelling of the Langmuir-Blodgett (LB)- multilayers predicts a columnar in-plane packing of the molecules. A GID experiment with monochromatic synchrotron radiation was used to verify the predicted multilayer structure on molecular level, while the Brewsterangle microscopy gave a deeper insight in the monolayer in-plane structure on micron scale.}, language = {en} } @article{AngelovaReicheIonovetal.1994, author = {Angelova, Angelina and Reiche, J{\"u}rgen and Ionov, Radoslav and Janietz, Dietmar and Lemmetyinen, Helge and Brehmer, Ludwig}, title = {Control of the structure of Langmuir-Blodgett films of a discotic liquid crystalline compound via the subphase composition and the adjacent molecular environment}, year = {1994}, abstract = {Changes of the molecular arrangenemt that can be induced by means of the LB technique in the multilayers of a disc-shaped multialkynyl amphiphile are monitored by means of small angle X-ray diffraction. Studies of the monolayers at the air-water interface reveal "edge-on" orientation of the discs. Specific effects of the counter- ions (Na+, Cd²+, Pb²+, and Ba²+) and sub-solution pH on the monolayer collapse pressure, transfer efficiency and molecular order in the multilayers are found. A correlation between the monolayer properties and the ability for formation of periodic discotic structures in the presence of divalent counterions is established. The discotic molecules retain their "edge-on" arrangement in the highly compressed transferred films with slight irregular interdigtation of the flexible wings and inclination to the substrate normal. The tilt and the inter- digitation are reduced when the discotic monolayers are deposited in alternating LB films with barium arachidate spacer layers.}, language = {en} } @article{KatholyReicheDietzeletal.1995, author = {Katholy, Stefan and Reiche, J{\"u}rgen and Dietzel, Birgit and Ruhmann, Ralf and Prescher, Dietrich}, title = {Copolymerer funktionalisierte Methacrylate}, year = {1995}, language = {de} } @article{KnochenhauerReicheBarberkaetal.1995, author = {Knochenhauer, Gerald and Reiche, J{\"u}rgen and Barberka, Thomas Andreas and Woolley, Martin and Tredgold, Richard H. and Hodge, P. and Brehmer, Ludwig}, title = {Do perfluorianted chains always have to be twisted?}, year = {1995}, abstract = {Short perfluorinated cabon chains do not take on helical structure when they are closely packed}, language = {en} } @article{ReicheDietelLemmetyinenetal.1992, author = {Reiche, J{\"u}rgen and Dietel, Reinhard and Lemmetyinen, Helge and Janietz, Dietmar and Lemmetyinen, Helge and Brehmer, Ludwig}, title = {Edge-on Langmuir-Blodgett multilayers derived from disc-shaped multiyne mesogens}, year = {1992}, abstract = {Langmuir-Blodgett(LB) multilayers were prepared from disc-shaped multiyne mesogens based on amphiphilic alkyl pentakis(aryl-ethynyl)benzene ethers. The two compounds used are characterized by five hydrophobic flexible chains and one hydrophilic substituent at the terminal position of the alkoxy chain. The LB films were analysed by X-ray scattering and spectroscopic measurements. An edge-on arrangement of the two discotic pentaalkynes within Y-type bilayers with a different packing density proved to be possible for the LB films of both compounds.}, language = {en} }