TY  - JOUR
A1  - Mukherjee, M.
A1  - Bhattacharya, M. K.
A1  - Sanyal, M. K.
A1  - Geue, Thomas
A1  - Grenzer, Jörg
A1  - Pietsch, Ullrich
T1  - Temperature dependent thickness and surface tension of polymer films
Y1  - 2000
SN  - 81-7371295-6
ER  - 
TY  - JOUR
A1  - Geue, Thomas
A1  - Schultz, Michael
A1  - Grenzer, Jörg
A1  - Natansohn, Almeria
A1  - Rochon, Paul
T1  - X-ray investigations of the molecular mobility with polymer surface gratings
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Geue, Thomas
A1  - Pietsch, Ullrich
A1  - Haferkorn, J.
A1  - Stumpe, Joachim
A1  - Date, R. W.
A1  - Fawcett, A. H.
T1  - Competition of alignment and aggregation? : Phenomena in constrained films of LC poly(olefin ulfone)s and maleic anhydride co- and terpolymers
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Reiche, Jürgen
A1  - Freydank, Anke-Christine
A1  - Helms, Andreas
A1  - Geue, Thomas
A1  - Schulz, Burkhard
A1  - Brehmer, Ludwig
A1  - Stiller, Burkhard
A1  - Knochenhauer, Gerald
T1  - Vacuum deposition films of oxadiazole compounds : formation and structure investigation
N2  - The search for alternative routes of organic thin film formation is stimulated by the outstanding properties of these films in such fields as nonlinear optics, photonic data processing and molecular electronics. The formation of highly ordered multilayer structures by thermal vacuum deposition (VD) of organic compounds is an essential step toward the application of supramolecular organic architectures in technical systems. The VD of an amphiphilic substituted 2,5- diphenylene-1,3,4-oxadiazole 1 onto silicon substrates at defined temperature was used for the formation of ultrathin films. The structural data obtained for the VD-films of oxadiazole 1 by means of X-ray reflectivity, X-ray grazing incidence diffraction and atomic force microscopy (AFM) investigations indicate the formation of well ordered oxadiazole multilayers. The structure of the VD-multilayers is compared with that of Langmuir-Blodgett (LB) films and thermally treated LB-multilayers prepared from the same compound.
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Geue, Thomas
A1  - Schultz, M.
A1  - Englisch, Uwe
A1  - Stömmer, Ralph
A1  - Pietsch, Ullrich
A1  - Meine, Kerstin
A1  - Vollhard, D.
T1  - Investigation of pH-dependent domain structure of fatty acid salt Langmuir-Blodgett films by means of X-ray diffuse scattering and Atomic Force Microscopy
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Henneberg, Oliver
A1  - Geue, Thomas
A1  - Saphiannikova, Marina
A1  - Pietsch, Ullrich
A1  - Rochon, Paul
A1  - Natansohn, Almeria
T1  - Formation and dynamics of polymer surface relief gratings
Y1  - 2001
SN  - 0378-5963
ER  - 
TY  - JOUR
A1  - Henneberg, Oliver
A1  - Chi, Li Feng
A1  - Geue, Thomas
A1  - Saphiannikova, Marina
A1  - Pietsch, Ullrich
A1  - Rochon, Paul
A1  - Natansohn, Almeria
T1  - Atomic force microscopy inspection of the early state of formation of polymer surface relief grating
Y1  - 2001
ER  - 
TY  - JOUR
A1  - Geue, Thomas
A1  - Saphiannikova, Marina
A1  - Henneberg, Oliver
A1  - Pietsch, Ullrich
A1  - Rochon, Paul
A1  - Natansohn, Almeria
T1  - Formation mechanism and dynamics in polymer surface gratings
Y1  - 2002
ER  - 
TY  - JOUR
A1  - Stiller, Burkhard
A1  - Geue, Thomas
A1  - Morawetz, Knut
A1  - Saphiannikova, Marina
T1  - Optical patterning in azobenzene polymer films
N2  - Thin azobenzene polymer films show a very unusual property, namely optically induced material transport. The underlying physics for this phenomenon has not yet been thoroughly explained. Nevertheless, this effect enables one to inscribe different patterns onto film surfaces, including one- and two-dimensional periodic structures. Typical sizes of such structures are of the order of micrometers, i.e. related to the interference pattern made by the laser used for optical excitation. In this study we have measured the mechanical properties of one- and two-dimensional gratings, with a high lateral resolution, using force-distance curves and pulse force mode of the atomic force microscope. We also report on the generation of considerably finer structures, with a typical size of 100 nm, which were inscribed onto the polymer surface by the tip of a scanning near-field optical microscope used as an optical pen. Such inscription not only opens new application possibilities but also gives deeper insight into the fundamentals physics underlying optically induced material transport
Y1  - 2005
SN  - 0022-2720
ER  - 
TY  - JOUR
A1  - Saphiannikova, Marina
A1  - Geue, Thomas
A1  - Henneberg, Oliver
A1  - Morawetz, Knut
A1  - Pietsch, Ullrich
T1  - Linear viscoelastic analysis of formation and relaxation of azobenzene polymer gratings
N2  - Surface relief gratings on azobenzene containing polymer films were prepared under irradiation by actinic light. Finite element modeling of the inscription process was carried out using linear viscoelastic analysis. It was assumed that under illumination the polymer film undergoes considerable plastification, which reduces its original Young's modulus by at least three orders of magnitude. Force densities of about 10(11) N/m(3) were necessary to reproduce the growth of the surface relief grating. It was shown that at large deformations the force of surface tension becomes comparable to the inscription force and therefore plays an essential role in the retardation of the inscription process. In addition to surface profiling the gradual development of an accompanying density grating was predicted for the regime of continuous exposure. Surface grating development under pulselike exposure cannot be explained in the frame of an incompressible fluid model. However, it was easily reproduced using the viscoelastic model with finite compressibility. (C) 2004 American Institute of Physics
Y1  - 2004
U6  - https://doi.org/10.1063/1.1642606
ER  -