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Neueste Veröffentlichungen
Gabriele Greco, Benjamin Schmuck, Fredrik G. Bäcklund, Günter Reiter and Anna Rising. ACS Applied Polymer Materials, published online
Recent biotechnological advancements in protein production and development of biomimetic spinning procedures make artificial spider silk a promising alternative to petroleum-based fibers. To enhance the competitiveness of artificial silk in terms of mechanical properties, refining the spinning techniques is imperative. One potential strategy involves the integration of post-spin stretching, known to improve fiber strength and stiffness while potentially offering additional advantages. Here, we demonstrate that post-spin stretching not only enhances the mechanical properties of artificial silk fibers but also restores a higher and more uniform alignment of the protein chains, leading to a higher fiber toughness. (more...)
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
- Systematic Control of Self-Seeding Crystallization Patterns of Poly(ethylene oxide) in Thin Films
- Binghua Wang, Shaohua Tang, Yan Wang, Changyu Shen, Renate Reiter, Günter Reiter, Jingbo Chen, Bin Zhang. Macromolecules 51, 1626–1635 (2018)
- Tuning relaxation dynamics and mechanical properties of polymer films of identical thickness
- Marwa Kchaou, Pierre Alcouffe, Sivasurender Chandran, Philippe Cassagnau, Günter Reiter, and Samer Al Akhrass. Phys. Rev. E 97, 032507 (2018)
- Highly n-doped graphene generated through intercalated terbium atoms
- L. Daukiya, M. N. Nair, S. Hajjar-Garreau, F. Vonau, D. Aubel, J. L. Bubendorff, M. Cranney, E. Denys, A. Florentin, G. Reiter, and L. Simon. Phys. Rev. B 97, 035309 (2018)
- Formation of Periodically Modulated Polymer Crystals
- Purushottam Poudel. Inauguraldissertation 2018
- Pneumatically Controlled Nanofluidic Devices for Contact-Free Trapping and Manipulation of Nanoparticles
- Michael Adrian Gerspach, Nassir Mojarad, Deepika Sharma, Yasin Ekinci,and Thomas Pfohl. Part. Part. Syst. Charact. 2018, 1800161
- Monitoring single-cell gene regulation under dynamically controllable conditions with integrated microfluidics and software
- M. Kaiser, F. Jug, T. Julou, S. Deshpande, T. Pfohl, O. K. Silander, G. Myers, E. van Nimwegen, Nature Communications 9, 212 (2018)
- Growth Kinetics of Stacks of Lamellar Crystals in Polymer Thin Films
- Sumit Majumder. Inauguraldissertation 2018
- Optical studies on indicators of order and disorder in films and crytals of a bulky substituted polythiophene
- Fanuel Mugwanga Keheze. Inauguraldissertation 2018
- Multiple structural transitions in Langmuir monolayers of charged soft-shell nanoparticles
- Ahmed El-Tawargy, David Stock, Markus Gallei, Wael Ramadan, Mamdoh Shams El-Din, Günter Reiter, Renate Reiter. Langmuir 34, 3909−3917 (2018)
- Thermodynamic origin of multi-layer structures in Langmuir polymer films
- Volker Knecht, Günter Reiter, Renate Reiter. Langmuir 33 (2017) 11399–11405
- Structure Formation in Langmuir Peptide Films As Revealed from Coarse-Grained Molecular Dynamics Simulations
- Volker Knecht, Günter Reiter, Helmut Schlaad, and Renate Reiter. Langmuir 33 (2017) 6492-6502
- Schnecken als lebende 3D-Drucker: freie Formen für die Architektur von morgen
- Christoph Allgaier, Benjamin Felbrich, Frederik Wulle, Emna Khechine, James H. Nebelsick, Achim Menges, Günter Reiter, Renate Reiter, Armin Lechler, Alexander Verl, Karl-Heinz Wurst. Baubionik – Biologie beflügelt Architektur, Publisher: Naturkundemuseum Stuttgart 2017
- Signatures of Melting and Recrystallization of a Bulky Substituted Poly(thiophene) Identified by Optical Spectroscopy
- Fanuel Keheze, Dominic Raithel, Tianyu Wu, Daniel Schiefer, Michael Sommer, Richard Hildner, Günter Reiter. Macromolecules 50 (2017) 6829–6839
- Triple-Shape Memory Materials via Thermoresponsive Behavior of Nanocrystalline Non-Isocyanate Polyhydroxyurethanes
- Vitalij Schimpf, Barbara Heck, Günter Reiter, Rolf Mülhaupt. Macromolecules 50 (2017) 3598–3606
- Semicrystalline long-chain polyphosphoesters from polyesterification
- Hanna Busch, Sumit Majumder, Guenter Reiter, Stefan Mecking. Macromolecules 50 (2017) 2706–2713
- Blocking of injected holes at the charge extracting interface
- L. Govor, G. Reiter, J. Parisi. Journal of Physics, Condensed Matter 29 (2017) 025001
- Relaxing Non-equilibrated Polymers in Thin Films at Temperatures Slightly Above the Glass Transition
- Mithun Chowdhury, Samer Al Akhrass, Falko Ziebert, Günter Reiter. Journal of Polymer Science Part B: Polymer Physics 55 (2017) 515–523
- Solvent-controlled reversible switching between adsorbed self-assembled nanoribbons and nanotubes
- Asad Jamal, Irina Nyrkova, Philippe Mesini, Swann Militzer and Günter Reiter. Nanoscale 9 (2017) 3293-3303
- Low Loss Optical Waveguiding in Large Single Crystals of Thiophene-Based Oligomers
- Sajedeh Motamen, Christian Schörner, Dominic Raithel, Jean-Pierre Malval, Thibaut Jarrosson, Françoise Serein-Spirau, Laurent Simon, Richard Hildner, Günter Reiter. Physical Chemistry Chemical Physics 19 (2017) 15980 - 15987
- Time Allowed for Equilibration Quantifies the Preparation Induced Non-equilibrium Behavior of Polymer Films
- Sivasurender Chandran, Rishab Handa, Marwa Kchaou, Samer Al Akhrass, Alexander Semenov, Günter Reiter. ACS Macro Lett. 6 (2017) 1296-1300