Publications
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Recent Publications
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...)
List of Publications
- Stick to Slip Transition and Adhesion of Lubricated Surfaces in Moving Contact
- G. Reiter, A.L. Demirel, J. Peanasky, L. Cai, S. Granick. J. Chem. Phys. 101, 2606 (1994)
- From Static to Kinetic Friction in Confined Liquid Films
- G. Reiter, A.L. Demirel, S. Granick. Science 263, 1741 (1994)
- Dewetting as a Probe of Polymer Mobility in Thin Films
- G. Reiter. Macromolecules 27, 3046 (1994)
- Chain Reorientation in Poly(tetrafluoroethylene) by Mobile Twin-Helix Reversal Defects
- M. Kimmig, G. Strobl, B. Stühn. Macromolecules 27, 2481-2495 (1994)
- Local Motion in the beta-Transition Range of Partially Crystalline Polyethylene Studied by Neutron-Scattering
- B. Holzer, G. Strobl, B. Stühn, N.H. Andersen. Colloid and Polymer Science 272, 1396-1402 (1994)
- Dynamics of Rotational Motion in Liquid Crystalline Systems
- W. Stille, G. Strobl. in: R. Richert, A. Blumen (Eds.), Disorder Effects on Relaxational Processes, p. 725, Springer, Berlin (1994).
- Molecular Weight Dependence of the Rotational Diffusion Constant and the Rotational Viscosity of Liquid Crystalline Side Group Polymers
- S. Götz, W. Stille, G. Strobl, H. Scheuermann. Macromolecules 26, 1520 (1993)
- Near-Critical Behavior of the Dynamic Stress-Optical Coefficient in Liquid Crystalline Elastomers
- R. Sigel, W. Stille, G. Strobl and R. Lehnert. Macromolecules 26, 4226 (1993)
- Adhesion Instabilities of Surfaces Undergoing Shear
- G. Reiter, J.S. Peanasky, L. Cai, A.L. Demirel, S. Granick. ACS Polymer Preprint Fall 1993
- Dynamics of Polymer Interdiffusion at Short Times
- U. Steiner, G. Reiter. Proceedings of the Les Houches Conference 1991: Dynamical Phenomena at Interfaces, Surfaces and Membranes, D. Beysens, N. Boccara, G. Forgacs, eds., Nova Science Publishers, New York, p. 511-512 (1993)
- Unstable Thin Polymer Films: Rupture and Dewetting Processes
- G. Reiter. Langmuir 9, 1344 (1993)
- Mobility of Polymers in Films Thinner Than Their Unperturbed Size
- G. Reiter. Europhysics Letters 23, 579 (1993)
- Investigation of the Interdiffusion between Poly(methylmethacrylate) Films by Marker Movement
- Y. Liu, G. Reiter, K. Kunz, M. Stamm. Macromolecules 26, 2134 (1993)
- Short Time Dynamics of Polymer Diffusion
- G. Reiter, U. Steiner. Progr. Colloid and Polymer Science 91, 93 (1993)
- Transition Regions and Surface Melting in Partially Crystalline Polyethylene: A Raman Spectroscopic Study
- R. Mutter, W. Stille, and G. Strobl. J. Polym. Sci. Part B: Polym. Phys. 31, 99 (1993)
- Smectic Surface-Structures in the Isotropic-Phase of Liquid-Crystalline Polymers Studied by X-Ray Reflectivity
- H. Elben, G. Strobl. Macromolecules 26, 1013-1018 (1993)
- Transient Inhomogenities in Polymeric Liquids and Solutions - Characterization by Static and Dynamic Light-Scattering
- T. Koch, G.R. Strobl, B. Stühn. Polymer 34, 1988-1990 (1993)
- Kinetics of Rotational Motion in Liquid-Crystalline Polymers
- W. Stille, G. R. Strobl. Polym. Sci. (Russia) 35, 1484 (1993)
- Investigation of Optical Anisotropy at Polymer Surfaces and in Thin Polymer-Films by Variable-Angle Ellipsometry
- H. Kasten, G. Strobl. Fresenius Journal of Analytical Chemistry 346, 300-302 (1993)
- Molecular Weight Dependence of the Rotational Diffusion Constant and the Rotational Viscosity of Nematic Side-Group Polymers
- S. Götz, W. Stille, G. Strobl. Ber. Bunsenges. Phys. Chem. 97, 1315 (1993)