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Neueste Veröffentlichungen
Raphael Hertel, Maximilian Raisch, Michael Walter, Günter Reiter, Michael Sommer. Angew. Chem. Int. Ed. 2024, e202409369
Sterically distorted donor-acceptor p‑systems, termed DA springs, can be progressively planarized under mechanical load causing a bathochromic shift of the photoluminescence (PL) spectrum. By combining theory and experiment, we here use a simple linear force calibration for two different conformational mechanochromophores to determine molecular forces in polymers from the mechanochromic shift in PL wavelength during multiple uniaxial tensile tests. Two systems are used, i) a highly entangled linear glassy polyphenylene and ii) a covalent elastomeric polydimethylsiloxane network. The mean forces estimated by this method are validated using known threshold forces for the mechanochemical ring-opening reactions of two different spiropyran force probes. The agreement between both approaches underlines that these DA springs provide the unique opportunity for the online monitoring of local molecular forces present in diverse polymer matrices.(more...)
"Printing" on Polymer Single Crystals through Microregional Heating
Tianyu Wu, Haimu Ye, Xinyi Pan, Yaning He, Jun Xu, Günter Reiter. ACS Appl. Polym. Mater. 2024, 6, 14, 7969–7977
Polymer single crystals are composed of well-ordered polymer chains and possess a characteristic symmetric shape. If one can precisely control the microregional morphology, polymer single crystals have the potential to be used as functional templates for applications like information storage or cell culture. However, with current experimental approaches, it is rather difficult to generate predictable structures of defined size within polymer single crystals. Here, we propose a research strategy based on a combination of fluorescence labeling and microregional heating by irradiation with focused red light. This approach enabled us to locally heat single crystals while simultaneously following the thereby induced changes via fluorescence imaging with a micrometer lateral resolution. We found that polymers diffused out of the heated region within a stacked single crystal and thereby produced a hole at the irradiated location. (more...)
Da Huang, Thorsten Hugel, and Günter Reiter. Macromolecules 2024, 57, 3696–3705
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...)
Liste der Veröffentlichungen
- Self-Assembly of Supra-Molecular Systems on Graphene or Graphite
- Roozbeh Shokri. Inaugural-Dissertation zur Erlangung des Doktorgrades der Fakultät für Mathematik und Physik der Albert-Ludwigs-Universität Freiburg, 2013
- Competition of crystal nucleation to fabricate the oriented semi-crystalline polymers
- Yijing Nie, Huanhuan Gao, Muhuo Yu, Zuming Hu, Günter Reiter, Wenbing Hu. Polymer 54, 3402-3407 (2013)
- Controlling the Crystal Growth and Morphology of Conjugated Polymers
- Khosrow Rahimi. Inaugural-Dissertation zur Erlangung des Doktorgrades der Fakultät für Mathematik und Physik der Albert-Ludwigs-Universität Freiburg, 2013
- Charge transport in nanoparticle chains influenced by stabilizer molecules
- Leonid V. Govor, Gottfried H. Bauer, Günter Reiter, and Jürgen Parisi. Phys. Status Solidi A, 210, No. 6, 1107–1114 (2013)
- Reversibly slowing dewetting of conjugated polymers by light
- Ioan Botiz, Paul Freyberg, Natalie Stingelin, Arnold Chang-Mou Yang, Günter Reiter. Macromolecules 46, 2352–2356 (2013)
- Directing nuclear deformation on micropillared surfaces by substrate geometry and cytoskeleton organization
- F. Badique, D. R. Stamov, P. Davidson, M. Veuillet, G. Reiter, J.N. Freund, C. M. Franz, K. Anselme. Biomaterials 34, 2991-3001 (2013)
- Linear and Star-Shaped POSS Hybrid Materials Containing Crystalline Isotactic Polystyrene Chains
- Maximilian Vielhauer, Pierre J. Lutz, Günter Reiter und Rolf Mülhaupt. Journal of Polymer Science, Polymer Chemistry 51, 947–953 (2013)
- Generating long supramolecular pathways with a continuous density of states by physically linking conjugated molecules via their end groups
- R. Shokri, M. A. Lacour, J.-P. Lere-Porte, F. Serein-Spirau, K. Miqueu, J.-M. Sotiropoulos, F. Vonau, D. Aubel, M. Cranney, G. Reiter, and L. Simon, J. Am. Chem. Soc. 135, 5693–5698 (2013)
- Toughening Plastics by Crack Growth Inhibition Through Unidirectionally Deformed Soft Inclusions
- Sen Zhang, Shu Zhu, Keqing Han, Xiaoling Feng, Yu Ma, Muhuo Yu, Günter Reiter. Polymer 54, 6019–6025 (2013)
- Swelling with a Near-Theta Solvent as a Means to Modify the Properties of Polymer Thin Films
- Andrew Clough, Mithun Chowdhury, Kaiwan Jahanshahi, Günter Reiter, Ophelia K.C. Tsui. Macromolecules 45, 6196−6200 (2012)
- Controllable processes for generating large single crystals of poly(3-hexylthiophene)
- Khosrow Rahimi, Ioan Botiz, Natalie Stingelin, Navaphun Kayunkid, Michael Sommer, Felix Peter, Vinzenz Koch, Ha Nguyen, Olivier Coulembier, Philippe Dubois, Martin Brinkmann and Günter Reiter. Angew. Chem. 124, 11293 –11297 (2012)
- Effect of Shear Stress on Crystallization of Isotactic Polypropylene from a Structured Melt
- Bin Zhang, Jingbo Chen, Jing Cui, Fangfang Ji, Guoqiang Zhen, Hui Zhang, Barbara Heck, Günter Reiter, Changyu Shen. Macromolecules 45, 8933–8937 (2012)
- Consequences of varying adsorption strength and adding steric hindrance on self-assembly of supra-molecular polymers on carbon substrates
- Roozbeh Shokri, Francois Vonau, Marion Cranney, Dominique Aubel, Ashok Narladkar, Benjamin Isare, Laurent Bouteiller, Laurent Simon, Günter Reiter. J. Phys. Chem. C 116 (40), 21594–21600 (2012)
- Segmental Relaxations Have Macroscopic Consequences in Glassy Polymer Films
- Mithun Chowdhury, Paul Freyberg, Falko Ziebert, Arnold C.-M. Yang, Ullrich Steiner and Günter Reiter. Phys. Rev. Lett. 109, 136102 (2012)
- Shear-stress sensitive lenticular vesicles for targeted drug delivery
- Margaret N. Holme, Illya A. Fedotenko, Daniel Abegg, Jasmin Althaus, Lucille Babel, France Favarger, Renate Reiter, Radu Tanasescu, Pierre-Léonard Zaffalon, André Ziegler, Bert Müller, Till Saxer, Andreas Zumbuehl. Nature Nanotechnology 7, 536–543 (2012)
- Probing Properties of Polymers in Thin Films via Dewetting.
- Günter Reiter. In: "Glass Transition, Dynamics and Heterogeneity of Polymer Thin Films", Ed. Toshiji Kanaya. Springer, ISBN 978-3-642-34338-4, Adv. Polym. Sci. 252, 29 (2013)
- Thin Polymer Films Out of Thermodynamic Equilibrium
- Mithun Chowdhury. Inaugural-Dissertation zur Erlangung des Doktorgrades der Fakultät für Mathematik und Physik der Albert-Ludwigs-Universität Freiburg, 2012
- Investigation of Melting and Re-Crystallisation Behavior of Polyethylene Nanocrystals
- Nandita Basu. Inaugural-Dissertation zur Erlangung des Doktorgrades der Fakultät für Mathematik und Physik der Albert-Ludwigs-Universität Freiburg, 2012
- Severe deformations of malignant bone and skin cells, as well as aged cells, on micropatterned surfaces
- Patricia M. Davidson, Tokuko Haraguchi, Takako Koujin, Thorsten Steinberg, Pascal Tomakidi, Yasushi Hiraoka, Karine Anselme, Günter Reiter. In "Biomaterials Surface Science" Eds. Andreas Taubert, Joao F. Mano, Jose Carlos Rodriguez-Cabello. Wiley-VCH Germany, ISBN 978-3527330317 (2013)
- Morphological changes during annealing of polyethylene nanocrystals
- Nandita Basu, Anna Osichow, Stefan Mecking, Günter Reiter. EPJE 35,18 (2012)