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Recent Publications

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...)


Unraveling the complex polymorphic crystallization behavior of the alternating copolymer DMDS-alt-DVE

Valentina Pirela, Justine Elgoyhen, Radmila Tomovska, Jaime Martin Perez, Cuong Minh Quoc Le, Abraham Chemtob, Brahim Bessif, Barbara Heck, Günter Reiter, and Alejandro Müller. ACS Appl. Polym. Mater.  5 (2023) 5260–5269

valent.jpgA complex crystallization behavior was observed for the alternating copolymer DMDS-alt-DVE synthesized via thiol–ene step-growth polymerization. Understanding the underlying complex crystallization processes of such innovative polythioethers is critical for their application, for example, in polymer coating technologies. These alternating copolymers have polymorphic traits, resulting in different phases that may display distinct crystalline structures. The copolymer DMDS-alt-DVE was studied in an earlier work, where only two crystalline phases were reported: a low melting, L – Tm, and high melting, H – Tm phase. Remarkably, the H – Tm form was only achieved by the previous formation and melting of the L – Tm form. We applied calorimetric techniques encompassing seven orders of magnitude in scanning rates to further explore this complex polymorphic behavior. (more...)

Transparent, thermoplastic, aliphatic polyesters through crystallization under molecular confinement

Maziar Matloubi, Melika Sarem, Barbara Heck, Günter Reiter, and V. Prasad Shastri.  Matter 6 (2023) 3057-3074

shastri-matter.jpgIn semi-crystalline biodegradable polymers, uncontrolled evolution of crystallinity impacts processing and bulk properties, limiting their application. Through molecular confinement of low-molecular-weight poly(L-lactic acid) (PLLA) segments by polysiloxane blocks and processing at far-from-equilibrium conditions, PLLA crystallization into lamellae of a few nm in thickness with coherence lengths below 100 nm was achieved, thus giving access to films that are optically transparent for over 5 years, possess high Young’s modulus and elongation at break, undergo controlled degradation, and support functional endothelialization. The films possess a nanophase segregated bulk morphology with a hydrophobic siloxane-dominated surface that can be pressure bonded following cold oxygen plasma activation and low-temperature glassy PLLA domains interspersed by nanoscale crystalline physical crosslinks that enable glass transition temperature-triggered shape change. The segmented thermoplastic polyesters (STEPs) can additionally be processed using melt-extrusion printing into 3D objects, thus opening potential application opportunities in the fabrication of implantable/degradable electronics, smart textiles, and packaging. (more...)


List of Publications

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)
Anisotropic Charge Transport in Spherulitic Poly(3-hexylthiophene) Films
Edward J. W. Crossland, Kim Tremel, Florian Fischer, Khosrow Rahimi, Günter Reiter, Ullrich Steiner, and Sabine Ludwigs. Adv. Mater. 24, 839–844 (2012)
Molecular dynamics and biaxiality of nematic polymers and elastomers
Felicitas Brömmel, Werner Stille, Heino Finkelmann, Anke Hoffmann. Soft Matter 7, 2387-2401 (2011)
Non-equilibrium behavior of thin polymer films
Katherine R. Thomas, Alexis Chenneviere, Günter Reiter and Ullrich Steiner. Phys. Rev. E 83, 021804 (2011)
Depression of the Zero Growth Temperature by Counits Observed for s-Polypropylene in Light Attenuation Experiments
Ralf Delto, Werner Stille, Gert Strobl. Macromolecules 43, 1035-1040 (2010)
Conductance fluctuations in metal-nanoparticle-metal junctions
L. V. Govor, G. H. Bauer, G. Reiter, and J. Parisi. Phys. Rev. B 82, 155437 (2010)
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