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Neueste Veröffentlichungen

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...)


Liste der Veröffentlichungen

Visualizing properties of polymers at interfaces: Relations between molecular features and macroscopic behaviour
Günter Reiter. In “Soft Matter: Scattering, Imaging and Manipulation”, Volume IV: Imaging and Manipulation Techniques Eds.: R. Pecora, R. Borsali, Springer 2008, ISBN 978-1402044649
Some general remarks on crystallization in the presence of additives
Günter Reiter and Jean-Georges Barth. Elemente der Naturwissenschaft 92, 39-61 (2010)
Network swelling competing with translational entropy in autophobic polymer dewetting
W. Beziel, G. Reiter, E. Drockenmuller, R.-V. Ostaci, S. Al Akhrass, F. Cousin, M. Sferrazza. Europhysics Letters 90, 26008 (2010)
Processes of Ordered Structure Formation in Polypeptide Thin Film Solutions
Ioan Botiz, Helmut Schlaad, Günter Reiter. Adv. in Polymer Science, 242 (2011) 117-149
Multi-curvature liquid meniscus in a nanochannel: Evidence of interplay between intermolecular and surface forces
Pilnam Kim, Ho-Young Kim, Jae Kwan Kim, Günter Reiter, Kahp Y. Suh. Lab Chip 9, 3255-3260 (2009)
Self-assembled patterns from evaporating layered fluids
L. V. Govor, J. Parisi, G. H. Bauer, G. Reiter. Journal of Physics - Condensed Matter 21, 264015 (2009)
Dewetting as an investigative tool for studying properties of thin polymer films
Günter Reiter, Samer Al Akhrass, Moustafa Hamieh, Pascal Damman, Sylvain Gabriele, Thomas Vilmin, Elie Raphaël. Eur. Phys. J. - Special Topics 166, 165-172 (2009)
Characterizing and modeling the non-linear viscoelastic tensile deformation of a glass fiber reinforced polypropylene
J. Fritsch, S. Hiermaier, G. Strobl. Composites Science and Technology 69, 2460-2466 (2009)
Colloqium: Laws controlling crystallization and melting in bulk polymers
G. Strobl. Rev. Mod. Phys. 81, 1287-1300 (2009)
Deformation of cholesteric elastomers by uniaxial stress along the helix axis
Werner Stille. Eur. Phys. J. E 28, 57-71 (2009)
高分子物理学: 理解其结构和性质的基本概念
作者:(德国)G.斯特罗伯 译者:胡文兵 蒋世春 门永峰 北京:科学出版社 2009, ISBN 978-7-03-022441-5
Metastable Untwisted States in Cholesteric Elastomers
Werner Stille. Macromolecules 42, 7979-7981 (2009)
Gradient Interfaces in SBS and SBS/PS Blends and Their Influence on Morphology Development and Material Properties
Yi Thomann, Ralf Thomann, Alfred Hasenhindl, Rolf Mülhaupt, Barbara Heck, Konrad Knoll, Helmut Steininger, Kay Saalwächter. Macromolecules 42, 5684-5699 (2009)
Understanding crystal orientation in quasi-one-dimensional polymer systems
Yu Ma, Wenbing Hu, Jamie Hobbs, Guenter Reiter. Soft Matter 4, 540-543 (2008)
Oligonucleotide nanostructured surfaces: effect on Escherichia coli curli expression
Nicolas Cottenye, Francisco Teixeira Jr., Arnaud Ponche, Günter Reiter, Karine Anselme, Wolfgang Meier, Lydie Ploux, Corinne Vebert-Nardin. Macromolecular Bioscience 8, 1161-1172 (2008)
Morphological Instabilities of Polymer Crystals
Nikolay Grozev, Ioan Botiz, Günter Reiter. Eur. Phys. J. E 27, 63-71 (2008)
Crystal nucleation enhanced at the diffusive interface of immiscible polymer blends
Yu Ma, Liyun Zha, Wenbing Hu, Günter Reiter, Charles C. Han. Phys. Rev. E 77, 061801 (2008)
Semicrystalline Macromolecular Design by Nitroxide-Mediated Polymerization
Khaled Karaky, Gérald Clisson, Günter Reiter, Laurent Billon. Macromol. Chem. Phys. 209, 715–722 (2008)
Viscoelastic Thin Polymer Films under Transient Residual Stresses: Two-Stage Dewetting on Soft Substrates
S. Al Akhrass, G. Reiter, S.Y. Hou, M. H. Yang, Y. L. Chang, F. C. Chang, C. F. Wang, A. C.-M. Yang. Phys. Rev. Lett. 100, 178301 (2008)
The Influence of Protic Non-Solvents Present in the Environment on Structure Formation of Poly(γ-benzyl-L-glutamate) in Organic Solvents
Ioan Botiz, Nikolay Grozev, Helmut Schlaad, Günter Reiter. Soft Matter, 4, 993-1002 (2008)
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