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Neueste Veröffentlichungen
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
- Capillary rise in glass fabrics.
- J.M. Senecot, M. Nardin, G. Reiter, J. Schultz, P. Christou, P. Henrat. Le Vide: Science, Technique et Applications 296, 440-445 (2000)
- Etude par microscopie à force atomique de la cristallisation de polymères
- G. Reiter, G. Castelein, J.U. Sommer, L. Vidal. Actes du Forum des Microscopies à Sonde Locale, Marly le Roi, 7-9 mars 2000, p. 68-69
- Block crystallization in model triarm star block copolymers with two crystallizable blocks. A time-resolved SAXS-WAXS study
- G. Floudas, G. Reiter, O. Lambert, P. Dumas, F.J. Yeh, B. Chu. In: Scattering from Polymers: Characterization by X-rays, Neutrons, and Light. ACS Symposium Series 739 (2000) 448-455
- Light scattering by fluctuations within a nematic wetting layer in a isotropic phase of a liquid crystal
- R. Sigel, G. Strobl. Journal of Chemical Physics 112, 1029-1039 (2000)
- Temperature and strain rate independence of critical strains in polyethylene and poly(ethylene-co-vinyl acetate)
- S. Hobeika, Y. Men, G. Strobl. Macromolecules 33, 1827-1833 (2000)
- Investigating the mechanisms of polymer crystallization by SAXS experiments
- G. Hauser, J. Schmidtke, G. Strobl, T. Thurn-Albrecht. ACS Symposium Series 739, 140-151 (2000)
- Static and Dynamic Light Scattering of a Nematic Side-Group Polysiloxane
- Jürgen Schmidtke, Werner Stille, and Gert Strobl. Macromolecules 33, 2922 (2000)
- Isothermal crystallization and melting of isotactic polypropylene analyzed by time- and temperature-dependent small-angle X-ray scattering experiments
- M. Iijima, G. Strobl. Macromolecules 33, 5204-5214 (2000)
- From the melt via mesomorphic and granular crystalline layers to lamellar crystallites: A major route followed in polymer crystallization?
- G. Strobl. Eur. Phys. J. E 3, 165 (2000)
- Steps in the formation of the partially crystalline state
- Barbara Heck, Thosten Hugel, Masanori Iijima, Gert Strobl. Polymer 41, 8839-8848 (2000)
- Polymer Studies
- G. Reiter. Chapter 10 in Lecture Notes in Physics No. 58, X-Ray and Neutron Reflectivity: Principles and Applications, Eds. J. Daillant, A. Gibaud , 1999
- Morphological Pathways of Pattern Evolution and Dewetting in Thin Liquid Films
- A. Sharma, R. Khanna, R. Konnur, G. Reiter. K.L. Mittal, ed., VSP Publishers, Utrecht (1999)
- Nanometer-scale Surface Patterns with Long Range Order Created by Crystallisation of Diblock Copolymers
- G. Reiter, G. Castelein, P. Hoerner, G. Riess, A. Blumen, J.-U. Sommer. Phys. Rev. Lett. 83, 3844-3847 (1999)
- A Thin Film Analog of the Corneal Mucus Layer of the Tear Film: An Enigmatic Long Range Non-Classical DLVO Interaction in the Breakup of Thin Polymer Films
- A. Sharma, R. Khanna, G. Reiter. Colloids & Surfaces B 14, 223-235 (1999)
- The Strength of Long-Range Forces Across Thin Liquid Films
- G. Reiter, A. Sharma, R. Khanna, A. Casoli, M.O. David. J. Coll. Interf. Sci. 214, 126 (1999)
- Destabilising Effect of Long Range Forces in Thin Liquid Films on Wettable Substrates
- G. Reiter, A. Sharma, A. Casoli, M.-O. David, R. Khanna, P. Auroy. Europhys. Lett. 46, 512 (1999)
- Thin Film Instability Induced by Long Range Forces
- G. Reiter, A. Sharma, A. Casoli, M.O. David, R. Khanna, P. Auroy. Langmuir 15, 2551-2558 (1999)
- Network stretching, slip processes, and fragmentation of crystallites during uniaxial drawing of polyethylene and related copolymers. A comparative study
- R. Hiss, S. Hobeika, C. Lynn, G. Strobl. Macromolecules 32, 4390-4403 (1999)
- Reversible surface melting of PE and PEO crystallites indicated by TMDSC
- W.B. Hu, T. Albrecht, G. Strobl. Macromolecules 32, 7548-7554 (1999)
- A general scheme derived from video-controlled stretching tests and WAXS for describing tensile deformations of polyethylenes
- R. Hiss, S. Hobeika, C. Lynn, G. Strobl. Journal of Macromolecular Science - Physics B38, 847-858 (1999)