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Recent Publications

Mechanism for the Formation of Millimeter-Long Solid Filaments by Spin Coating Dilute Solutions of a Crystallizable Polymer

Da Huang, Thorsten Hugel, and Günter Reiter. Macromolecules, published online

huang.jpgWe have investigated the formation of millimeter-long filaments induced by spin-coating ca. 130 °C dilute para-xylene solutions of rapidly crystallizable polyethylene chains with a contour length in the micrometer range onto ca. 80 °C mica substrates. These filaments were radially oriented and accumulated on the periphery of the substrate. Our observations can be explained by the stretching of polymers through the flow field induced by spinning the solution on a solid substrate. The corresponding loss in conformational entropy emphasized attractive interactions between polymers, which resulted in the formation of bundles and their assembly into long filaments. Caused by a Plateau–Rayleigh-type instability of a liquid coating on a solid filament and due to crystallization, these filaments were decorated with various small-scale structures. (more...)

Competing influences of cooling rate and diluent concentration on crystallization of poly(3-hexylthiophene)

Mina Alizadehaghdam, Farhang Abbasi, Günter Reiter. J. Phys. Chem. C 128 (2024) 4757–4765

mina.jpgCrystallization of poly(3-hexylthiophene) (P3HT) was studied in mixtures of different concentrations of 3-hexylthiophene (3HT) as a diluent. Two coexisting crystal populations, socalled “thin” and “thick” crystals, with melting temperatures differing by more than 10 °C were observed in these mixtures. Intriguingly, the “thick” crystals represented transient unstable structures, with a mass fraction that was the highest ФH for rapidly crystallized P3HT in presence of significant amount of diluent. Reflecting its dependence on growth kinetics, ФH decreased with increasing crystallization temperature, extended crystallization time or lower cooling rate. The presence of a diluent led to a “depression” of the melting temperature, described by Raoult’s law and the Flory equation, which was similar for P3HT samples crystallized in various ways. (more...)

Tuning the hydraulic resistance by swelling-induced buckling of membranes in high-aspect-ratio microfluidic devices

Claas-Hendrik Stamp, Binyam Solomon, Friederike Lang, Efstathios Mitropoulos and Thomas Pfohl.
Lab Chip 23 (2023) 3662-3670

stamp.jpgControlling fluid flow in microfluidic devices and adapting it to varying conditions by selectively regulating hydrodynamic properties is of critical importance, as the field of microfluidics faces increasingly complex challenges in its wide range of applications. One way to manipulate flows in microfluidic devices is to introduce elastic elements that can be actively or passively deformed. In this work, we developed a membrane-based microfluidic device that allows us to study the deformation of swollen thin membranes as a function of the volume fractions in binary mixtures – here isopropanol and water. (more...)



List of Publications

Structure of Thin Block-Copolymers Films Studied by X-Ray Reflectivity
R. Mutter, G. Strobl, B. Stühn. Fresenius Journal of Analytical Chemistry 346, 297-299 (1993)
Dependence of the rotational viscosity of nematic mixtures on the rotational diffusion constants of their components
G. Christoph, W. Stille and G. Strobl. J. Chem. Phys. 99, 3075 (1993)
Molecular-Dynamics in Perfluoro-n-Eicosane. 4. Oscillatory and Diffusive Rotational Motion
M. Kimmg, R. Steiner, G. Strobl, B. Stühn. Journal of Chemical Physics 99, 8105-8114 (1993)
Ellipsometric characterisation of streptavidin binding to biotin-functionalized monolayers at the air-water interface
R. Reiter, H. Motschmann, W. Knoll. Langmuir 9, 2430-2435 (1993)
Pretransitional nematic surface order in the isotropic phase of phenylcyclohexanes
S. Immerschitt, T. Koch, W. Stille and G. Strobl. J. Chem. Phys. 96, 6249 (1992)
Formation of Silver Islands on Langmuir-Blodgett Films as Investigated by X-ray Reflectometry
G. Reiter, C.Bubeck, M. Stamm. Langmuir 8, 1881 (1992)
Dewetting of Thin Polymer Films
G. Reiter. Physical Review Letters 68, 75 (1992)
Application of 15N Nuclear Reaction Technique for Hydrogen Analysis in Polymer Thin Films
D. Endisch, F. Rauch, A. Götzelmann, G. Reiter, M. Stamm. Nuclear Instruments and Methods in Physics Research B62, 513 (1992)
Use of Ellipsometry in a Study of the Surface Order in the Isotropic Phase of a Liquid Crystalline Polyacrylate
S. Immerschitt, W. Stille, and G. Strobl. Macromolecules 25, 3227 (1992)
Light-Scattering Study of Fluctuations oin Concentration, Density, and Local Anisotropy in Polystyrene Dioxane Mixtures
T. Koch, G. Strobl, B. Stühn. Macromulecules 25, 6255-6261 (1992)
Neutron-Scattering Study of Segmental Dynamics in the Disordered Regions of Partially Crystalline Polyethylene
G. Hohlweg, B. Holzer, W. Petry, G. Strobl, B. Stühn. Macromolecules 25, 6248-6254 (1992)
Ellipsometric microscopy: Imaging monomolecular surfactant layers at the air-water interface
R. Reiter, H. Motschmann, H. Orendi, A. Nemetz, W. Knoll. Langmuir 8, 1784-1788 (1992)
The Effect of Short and Long Range Interactions on the Break up and Dewetting of Thin Polymer Films
G. Reiter. Proceedings of the MRS Fall meeting 1991, Boston, USA
TOREMA - A Neutron Reflectometer at Jülich
M. Stamm, S. Hüttenbach, G. Reiter. Physica B 173, 11 (1991)
The Use of X-ray and Neutron Reflectometry for the Investigation of Polymeric Thin Films
M. Stamm, G. Reiter, K. Kunz. Physica B 173, 35 (1991)
The Interface between 2 Strongly Incompatible Polymers
S. Hüttenbach, M. Stamm, G. Reiter, M. Foster. Langmuir 7, 2438 (1991)
Initial Stages of Polymer Interdiffusion Studied by Neutron Reflectometry
M. Stamm, S. Hüttenbach, G. Reiter, T. Springer. Europhys. Lett. 14, 451 (1991)
Measurements of Polymer Diffusion Over Small Distances: A Check of Reptation Arguments
G. Reiter, U. Steiner. J. Phys. (France) II 1, 659-671 (1991)
Time Regimes in Polymer Interdiffusion Determined by Marker Movement
G. Reiter, S. Hüttenbach, M. Foster, M. Stamm. Macromolecules 24, 1179 (1991)
X-ray and Neutron Reflectometry for the Investigation of Polymer Diffusion
G. Reiter, S. Hüttenbach, M. Foster, M. Stamm. Fresenius J. Anal. Chem. 341, 284-288 (1991)
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