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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

A Generic Model for Growth and Morphogenesis of Polymer Crystals in Two Dimensions
Jens-Uwe Sommer and Günter Reiter. In Lecture Notes in Physics: "Polymer Crystallization: Observations, Concepts and Interpretations". Eds. Jens-Uwe Sommer and Günter Reiter, p.153-176, 2003
Crystallization of Polymers in Thin Films: Model experiments
Günter Reiter, Gilles Castelein and Jens-Uwe Sommer. In Lecture Notes in Physics: "Polymer Crystallization: Observations, Concepts and Interpretations". Eds. Jens-Uwe Sommer and Günter Reiter, p.131-152, 2003
Polymer Crystallization: Obervations, Concepts and Interpretations
Editors: Jens-Uwe Sommer and Günter Reiter. Lecture Notes in Physics 606 (2003), Springer Berlin/Heidelberg, ISSN 1616-6361
Dewetting of thin polymer films at temperatures close to the glass transition
G. Reiter, M. Sferrazza, P. Damman. Eur. Phys. J. E 12, 133–138 (2003)
Editorial on "Focus point": Unstable thin films
A.M. Donald, J.F. Joanny,M. Moller,G. Reiter. Eur. Phys. J. E 12, 359-360 (2003)
Crystal growth rates of diblock copolymers in thin films: Influence of film thickness
G.Reiter, L.Vidal. Eur. Phys. J. E 12, 497-505 (2003)
Self-destruction and dewetting of thin polymer films: the role of interfacial tensions
G. Reiter, R. Khanna, A. Sharma. J. Phys. Condensed Matter 15 (2003) S331-S336
Crystallization of s-polypropylene from the glassy state: Indications for a multistage process
M. Grasruck, G. Strobl. Macromolecules 36, 86-91 (2003)
A molar mass induced transition in the yielding properties of linear polyethylene
Qiang Fu, Yongfeng Men, Gert Strobl. Polymer 44, 1941-1947 (2003)
Understanding of the tensile deformation in HDPE/LDPE blends based on their crystal structure and phase morphology
Qiang Fu, Yongfeng Men, Gert Strobl. Polymer 44, 1927-1933 (2003)
Critical strains in poly(epsilon-caprolactone) and blends with poly(vinyl methyl ether) and poly(styrene-co-acrylonitrile)
Yongfeng Men, Gert Strobl. Macromolcules 36, 1889-1898 (2003)
On the mechanisms of recrystallization after melting in semicrystalline polymers: The effect of the initial melt state
M. Al-Hussein, G. Strobl. Journal of Macromolecular Science - Physics B42, 677-685 (2003)
Fluorescence of a dye-doped cholesteric liquid crystal film in the region of the stop band: theory and experiment
J. Schmidtke and W. Stille. Eur. Phys. J. B 31, 179 (2003)
Investigating polymer crystallization by time-dependent light scattering: a direct approach in the data analysis applied for s-polypropylene
Anke Hoffmann, Gert Strobl. Polymer 44, 5803-5809 (2003)
Defect Mode Emission of a Dye Doped Cholesteric Polymer Network
J. Schmidtke, W. Stille, H. Finkelmann. Phys. Rev. Lett. 90, 083902 (2003)
Condensed Matter Physics: Crystals, Liquids, Liquid Crystals, and Polymers
Gert Strobl. Springer 2003, ISBN 978-3540003533
Role of the entangled amorphous network in tensile deformation of semicrystalline polymers
Y. F. Men, J. Rieger, G. Strobl. Physical Review Letters 91, 095502 (2003)
Photonic defect modes in cholesteric liquid crystal films
J. Schmidtke and W. Stille. Eur. Phys. J. E 12, 553 (2003)
Characteristic variations in the effect of diluents on polymer crystallization and melting observed for a sample of poly (ethylene-co-octene)
Barbara Heck, Gert Strobl, Michael Grasruck. Eur. Phys. J. E 11, 117-130 (2003)
Editorial: Special issue on Properties of Thin Polymer Films
Günter Reiter (Editor) and James Forrest (Guest Editor). Eur. Phys. J. E 8, 101 (2002)
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