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Neueste Veröffentlichungen
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...)
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
A 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
In 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...)
Liste der Veröffentlichungen
- Heat dissipation in Sm3+ and Zn2+ co-substituted magnetite (Zn0.1SmxFe2.9-xO4) nanoparticles coated with citric acid and pluronic F127 for hyperthermia application
- S. Shatooti, M. Mozaffari, G. Reiter, D. Zahn, S. Dutz. Scientific Reports 11 (2021) 16795
- Controlled Switching from the Growth of Mono-Lamellar Polymer Crystals to the Formation of Stacks of Uniquely Oriented Lamellae
- Weixiang Chen, Brahim Bessif, Renate Reiter, Jun Xu, Günter Reiter. Macromolecules 54 (2021) 8135–8142
- Self-Seeding Procedure for Obtaining Stacked Block Copolymer Lamellar Crystals in Solution
- Brahim Bessif, Thomas Pfohl and Günter Reiter. Polymers 13 (2021) 1676
- Non-equilibrium Properties of Thin Polymer Films
- Sivasurender Chandran, Günter Reiter. In Matyjaszewski et al. (Eds.): Macromolecular Engineering: From Precise Synthesis to Macroscopic Materials and Applications, 4 Volumes, 2nd ed. Edition, Wiley-VCH Verlag GmbH, 2022. ISBN 9783527344550
- Concepts of nucleation in polymer crystallization
- Jun Xu, Günter Reiter, Rufina G. Alamo. Crystals 11 (2021) 304
- Continuous illumination of a conjugated polymer causes strong enhancement of photoluminescence
- Yaser AlShetwi, Daniel Schiefer, Michael Sommer. Günter Reiter. J. Phys. Chem. B 125 (2021) 5636–5644
- Formation of Stacked Three-Dimensional Polymer “Single Crystals”
- Zhixin Guo, Shouke Yan, Günter Reiter. Macromolecules 54 (2021) 4918–4925
- Measurements of periodically perturbed dewetting force fields and their consequences on the symmetry of the resulting patterns
- Konstantinos Roumpos, Sarah Fontaine, Thomas Pfohl, Oswald Prucker, Jürgen Rühe, and Günter Reiter. Scientific Reports 11 (2021) 13149
- Changes in surface free energy and surface conductivity of carbon nanotubes/polyimide nanocomposite films induced by UV irradiation
- Baode Zhang, Marialaura Clausi, Barbara Heck, Susanna Laurenzi, Gabriella Santonicola, Janis Kleperis, Andris Antuzevičs, Guenter Reiter, Andrey Aleshin, Anatoly Lobach. ACS Appl. Mater. Interfaces 13 (2021) 24218–24227
- Surface-modified elastomeric nanofluidic devices for single nanoparticle trapping
- Deepika Sharma, Roderick Y. H. Lim, Thomas Pfohl and Yasin Ekinci. Microsystems & Nanoengineering 7 (2021) 46
- Optimization of Nanofluidic Devices for Geometry-Induced Electrostatic Trapping
- Deepika Sharma, Roderick Y. H. Lim, Thomas Pfohl, and Yasin Ekinci. Part. Part. Syst. Charact. 2021, 38, 2000275
- Tuning topography and patterns of thin polymer films on structured substrates
- Konstantinos Roumpos. Inauguraldissertation der Fakultät für Mathematik und Physik 2021. DOI: 10.6094/UNIFR/194127
- Morphological transitions in langmuir films of a diblock copolymer from polyethylene glycol and poly-L-lactide
- Emna Khechine. Inaugural-Dissertation zur Erlangung des Doktorgrades der Fakultät für Chemie und Pharmazie, 2021
- High-throughput injection molding of transparent fused silica glass
- Markus Mader, Oliver Schlatter, Barbara Heck, Andreas Warmbold, Alex Dorn, Hans Zappe, Patrick Risch, Dorothea Helmer, Frederik Kotz, Bastian E. Rapp. Science 372 (2021) 182-186
- Formation of large polymer crystals from metastable solutions
- Tianyu Wu. Inauguraldissertation der Fakultät für Chemie und Pharmazie 2020, DOI: 10.6094/UNIFR/167415
- Exploring pathways to equilibrate Langmuir polymer films
- Abhijna Das, Sebastian Noack, Helmut Schlaad, Günter Reiter, Renate Reiter. Langmuir 36 (2020) 8184–8192
- Energy transport and light propagation mechanisms in organic single crystals
- Bernd Wittmann, Stephan Wiesneth, Sajedeh Motamen, Laurent Simon, Françoise Serein-Spirau, Günter Reiter, and Richard Hildner. Journal of Chemical Physics 153 (2020) 144202
- Large quantum efficiency enhancements of pristine conjugated polymer MEH-PPV by interlayer polymer diffusion
- Po-Tsun Chen, Ya-Wei Yang, Günter Reiter, Arnold C.-M. Yang. Polymer 204 (2020) 122753
- Formation of Needle-like Poly(3-hexylthiophene) Crystals from Metastable Solutions
- Tianyu Wu, Thomas Pfohl, Sivasurender Chandran, Michael Sommer and Günter Reiter. Macromolecules 53 (2020) 8303–8312
- Rheological Properties of Blends of Isotactic Polystyrene–Isotactic Poly(para-methylstyrene) Films Derived from a Comparative Dewetting Study
- Austine Amukayia Mulama, Konstantinos Roumpos, Pradipkanti Lairenjam, Andrew Oduor, Günter Reiter. Macromolecules 53 (2020) 9122–9130