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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

Structural transition in a nematic LC block copolymer induced by the transition to the LC phase
J. Sänger, W. Gronski, S. Maas, B. Stühn, B. Heck. Macromolecules 30, 6783-6787 (1997)
A new approach to polymer crystallization used in an analysis of data of syndiotactic polypropylene
Gert Strobl. Acta Polymerica 48, 562-570 (1997)
Director field patterns of nematic polymer solutions at asynchronous rotation in a magnetic field
E. Pashkovsky, W. Stille, G. Strobl and D. Talebi. Mol. Cryst. Liq. Cryst. 302, 403 (1997)
SAXS and TEM studies on poly(styrene)-block-poly(ethene-co-but-1-ene)-block-poly(styrene) in bulk and at various interfaces
B. Heck, P. Arends, M. Ganter, J. Kressler, B. Stühn. Macromolecules 30, 4559-4566 (1997)
Improving Adhesion via Connector Polymers to Stabilize Non-wetting Liquid Films
G. Reiter, J. Schultz, P. Auroy, L. Auvray. Europhys. Lett. 33, 29 (1996)
Instabilities of Thin Polymer Films on Layers of Chemically Identical Grafted Molecules
G. Reiter, P. Auroy, L. Auvray. Macromolecules 29, 2150 (1996)
The Effect of Adhesion on the Rheological and Frictional Behavior of a Confined Lubricant Film
G. Reiter. J. Adhesion 57, 55 (1996)
Instability of Thin Polymer Films on Coated Substrates: Rupture, Dewetting and Drop Formation
A. Sharma, G. Reiter. J. Coll. Interf. Sci. 178, 383 (1996)
Glass transition in ethylene-vinylacetate copolymers analyzed by combined dielectric and X-ray scattering experiments
Bernd Holzer, Gert Strobl. Acta Polymerica 47, 40-47 (1996)
Observation of the early stages of crystallization in polyethylene by time-dependent SAXS: Transition from individual crystals to stacks of lamellae
T. Albrecht, G. Strobl. Macromolecules 29, 783-785 (1996)
Autophobic Behavior of Polymers at Interfaces
G. Reiter, P. Auroy, L. Auvray. Proceedings of the Moriond 95 Workshop, in: Moriond Condensed Matter Physics: “Short and Long Chains at Interfaces”, eds. J. Daillant, P. Guenoun, C. Marques, P. Muller, J. Trân Thanh Vân, p. 57-66
The Solid-like State of a Confined Liquid Lubricant: Deformation and Time Effects
G. Reiter, A. L. Demirel, J. Peanasky, L. Cai, S. Granick. Proceedings of the NATO Workshop on “The Physics of Sliding Friction” at Trieste/Italy, 1995,. Eds. B.N.J. Persson, E. Tosatti, NATO ASI Serie E, 311, 119-128 (1996)
What Determines Static Friction and Controls the Transition to Sliding
G. Reiter, A. L. Demirel, J. Peanasky, L. Cai, S. Granick. Tribology Lett. 1, 1 (1995)
Temperature-Dependent Crystalline-Amorphous Structures in Isotactic Polypropylene - Small-Angle X-Ray-Scattering Analysis of Edge-Bounded 2-Phase Systems
T. Albrecht, G. Strobl. Macromolecules 28, 5267-5273 (1995)
Periodic Pattern Formation in Side-Group Polymer Nematic Solutions at the Twist Frederiks Transition
E. E. Pashkovsky, W. Stille and G. Strobl. J. Phys. II France 5, 397 (1995)
Temperature-Dependent Crystalline-Amorphous Structures in Linear Polyethylene - Surface Melting and the Thickness of the Amorphous Layers
T. Albrecht, G. Strobl. Macromolecules 28, 5827-5833 (1995)
The effect of molecular association and tube dilation on the rotational viscosity and rotational diffusion in nematic liquid crystals
A. Raviol, W. Stille, and G. Strobl. J. Chem. Phys. 103, 3788 (1995)
Nematic Wetting at the Free-Surface of 4-Cyano-4'-N-Alkyl-Biphenyls
H. Kasten, G. Strobl. Journal of Chemical Physics 103, 6768-6774 (1995)
The Dynamics of Freedericksz Transitions in Nematic Solutions of Mesogenic Polymers
E. E. Pashkovsky, T. G. Litvina, W. Stille, and G. Strobl. Vysokomolekulyarnye Soedineniya Seriya A 37, 1272 (1995)
Self Diffusion of “Hairy Rod” Molecules in Langmuir-Blodgett-Kuhn Multilayers Probed with Neutron and X-ray Reflectometry
A. Schmidt, K. Mathauer, G. Reiter, M.D. Foster, M. Stamm, G. Wegner, W. Knoll. Langmuir 10, 3820 (1994)
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