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Da Huang, Thorsten Hugel, and Günter Reiter. Macromolecules, published online
We 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...)
Mina Alizadehaghdam, Farhang Abbasi, Günter Reiter. J. Phys. Chem. C 128 (2024) 4757–4765
Crystallization 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...)
Claas-Hendrik Stamp, Binyam Solomon, Friederike Lang, Efstathios Mitropoulos and Thomas Pfohl.
Lab Chip 23 (2023) 3662-3670
Controlling 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...)
Liste der Veröffentlichungen
- Molecular Orientational Correlations and Local Order in n-Alkane Liquids
- E.W. Fischer, G.R. Strobl, M. Dettenmaier, M. Stamm, N. Steidle. Faraday Discussions 68, 26-45 (1979)
- Einige polymerspezifische Anwendungen der Schwingungsspektroskopie
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- Circular Fluorescence Polarization of Achiral Molecules in Cholesteric Liquid Crystals
- H. Stegemeyer, W. Stille and P. Pollmann. Israel J. Chem. 18, 312 (1979)
- Molekulare Deutung der Umwandlungswärmen bei den Modifikationsübergängen des n-Tritriacontans
- G.R. Strobl. Coll. Polym. Sci. 256, 427-445 (1978)
- Raman Spectroscopic Method for Determining Crystallinity of Polyethylene
- G.R. Strobl, W. Hagedorn. J. Polym. Sci. Part B - Polymer Physics 16, 1181-1193 (1978)
- Molecular-Motion, Thermal-Expansion, and the Phase-Transitions in Paraffins: A Model for Polymers
- G.R. Strobl. J. Polym. Sci. Part C - Polymer Symposium 59, 121-142 (1977)
- Die molekularen Grundlagen der anisotropen thermischen Ausdehnung von Paraffinen und Polyäthylen. Eine ramanspektroskopische Untersuchung am Beispiel des N-Tritriacontans
- G.R. Strobl. Coll. Polym. Sci. 254, 170-189 (1976)
- Packing of Paraffin Chains in 4 Stable Modifications of n-Tritriacontane
- W. Piesczek, G.R. Strobl, K. Malzahn. Acta Cryst. B 30, 1278 (1974)
- Defect Structure and Molecular-Motion in 4 Modifications of Normal-Tritriacontane. 2. Study of Molecular-Motion Using Infrared Spectroscopy and Wide-Line Nuclear Magnetic-Resonance Measurements
- B. Ewen, E.W. Fischer, W. Pieszek, G. Strobl. J. Chem. Phys. 61, 5265-5272 (1974)
- Defect Structure and Molecular-Motion in 4 Modifications of Normal-Tritriacontane. 1. Study of Defect Structure in Lamellar Interfaces Using Small-Angle X-Ray-Scattering
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- An exactly solvable model for coherent and incoherent exciton motion
- H. Haken and G. Strobl. Zeitschrift für Physik 262, 135-148 (1973)
- Small-angle x-ray scattering experiments for investigating the validity of the two-phase model
- G.R. Strobl, N. Müller. Journal of Polymer Science B - Polymer Physics 11, 1219-1233 (1973)
- Determination of Lamellar Structure of Partially Crystalline Polymers by Direct Analysis of their Small-Angle X-Ray-Scattering Curves
- G.R. Strobl. Journal of Applied Crystallography 6, 365-370 (1973)
- Synthese und Eigenschaften molekulareinheitlicher n-Paraffine bis zum C140H282
- W. Heitz, E.W. Fischer, R. Peters, T. Wirth, G. Strobl. Makromolekulare Chemie 162, 63 (1972)
- Analyse von spaltverschmierten Kleinwinkelstreukurven lamellarer Strukturen
- G.R. Strobl. Kolloid-Zeitschrift and Zeitschrift für Polymere 250, 1039-1046 (1972)
- A New Method for Evaluating Slit-Smeared Small Angle X-Ray Scattering Data
- G.R. Strobl. Acta Crystallographica A 26, 367-375 (1970)