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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...)


Liste der Veröffentlichungen

Self-assembled nanotubes and nanoribbons of aromatic diamide-esters
Asad Jamal. Inaugural-Dissertation zur Erlangung des Doktorgrads der Fakultät für Mathematik und Physik der Universität Freiburg, 2016
Formation and Optical Characterization of Single Crystals of Poly(3-Hexylthiophene) (P3HT), a Model Conjugated Polymer
John O. Agumba. Inaugural-Dissertation zur Erlangung des Doktorgrads der Fakultät für Mathematik und Physik der Universität Freiburg, 2016
History Dependent Temporal Changes of Properties of Thin Polymer Films
Günter Reiter. In: Non-equilibrium Phenomena in Confined Soft Matter. Ed. Simone Napolitano. Springer 2015
Consequences of a Single Double Bond within a Side-Group on the Ordering of Supra-Molecular Polymers
Roozbeh Shokri, Olga Guskova, Asad Jamal, Kaiwan Jahanshahi, Benjamin Isare, Laurent Bouteiller, Laurent Simon, Jens-Uwe Sommer, Günter Reiter. The Journal of Physical Chemistry, Part C 119 (2015) 22596–22603
Different surface sensing of the cell body and nucleus in healthy primary cells and in a cancerous cell line on nanogrooves
Patricia Davidson, Maxence Bigerelle, Günter Reiter and Karine Anselm. Biointerphases 10, 031004 (2015) / DOI: 10.1116/1.4927556
How Chain-Folding Crystal Growth Determines Thermodynamic Stability of Polymer Crystals
Xiaoming Jiang, Günter Reiter, Wenbing Hu. J. Phys. Chem. B, 120 (2016) 566–571
Stabilization of nuclei of lamellar polymer crystals: Insights from a comparison of the Hoffman-Weeks line with the crystallization line
Jun Xu, Barbara Heck, Hai-Mu Ye, Jing Jiang, Yi-Ren Tang, Jin Liu, Bao-Hua Guo, Renate Reiter, Dongshan Zhou, Günter Reiter. Macromolecules 49 (2016) 2206–2215
Role of Preparation Pathways and Tacticity on the Non-Equilibrium Dynamcis of Polystyrene Films
Rishab Handa. Master Thesis im Studiengang M.Sc. Sustainable Materials, 2016
Variation of the contact resistance with electric current for gold electrodes on a squaraine single crystal
Leonid Govor, Guenter Reiter, and Jurgen Parisi. Phys. Status Solidi A 212 (2015) 2738–2746, DOI 10.1002/pssa.201532241
Simulation of secondary nucleation of polymer crystallization via a model of microscopic kinetics
Kun-Lun Xu, Bao-Hua Guo, Renate Reiter, Günter Reiter, Jun Xu. Chinese Chemical Letters 26, 1105–1108 (2015) / DOI: 10.1016/j.cclet.2015.06.002
From holes to drops to toroids: Conditions for the transcription of surface patterns into three-dimensional morphologies via rim instabilities in the course of dewetting
Samer Al Akhrass, Laurent Vonna and Günter Reiter. In: Polymer Surfaces in Motion: Unconventional Patterning Methods, Eds. Juan Rodriguez-Hernandez and Carlos Drummond. Springer 2015
Tuning Morphologies of Langmuir Polymer Films Through Controlled Relaxations of Non-Equilibrium States
Sivasurender Chandran, Stefanie Dold, Amaury Buvignier, Kai-Steffen Krannig, Helmut Schlaad, Günter Reiter, and Renate Reiter. Langmuir 2015, 31, 6426−6435. DOI: 10.1021/acs.langmuir.5b01212
High Temperature Stability of Dewetting-Induced Thin Polyethylene Filaments
Bin Zhang, Jingbo Chen, Paul Freyberg, Renate Reiter, Rolf Mülhaupt, Jun Xu, Günter Reiter. Macromolecules 48, 1518–1523 (2015)
Triangular dewetting by symmetry breaking in blends of stiff and flexible polymers
Paul Freyberg. Inaugural-Dissertation zur Erlangung des Doktorgrades der Fakultät für Mathematik und Physik der Albert-Ludwigs-Universität Freiburg, 2015
Conductive atomic force microscopy measurements on organic nanocrystals
Sven Renkert. Master Thesis, Fakultät für Mathematik und Physik der Albert-Ludwigs-Universität Freiburg, 2014
The influence of the additive composition on degradation induced changes in poly(ethylene-co-vinyl acetate) during photochemical aging
Angelika Beinert, Cornelia Peike, Ines Dürr, Michael D. Kempe, Günter Reiter, Karl-Anders Weiß. 29th European PV Solar Energy Conference and Exhibition, 22-26 Sept. 2014, Amsterdam, The Netherlands
Wie kristallisieren Polymere?
Gert Strobl. Physik Journal 13, 47-50 (2014)
The Crucial Role of Cadmium Acetate-Induced Conformational Restriction in Microscopic Structure and Stability of Polystyrene-block-Polyvinyl pyridine Thin Films
Feifei Xue, Hongfei Li, Jichun You, Conghua Lu, Günter Reiter, Shichun Jiang. Polymer 55, 5801-5810 (2014)
Molecular Weight Dependent Changes in Morphology of Solution Grown Polyethylene Single Crystals
Bin Zhang, Jingbo Chen, Moritz C. Baier, Stefan Mecking, Renate Reiter, Rolf Mülhaupt, Günter Reiter. Macrom. Rapid Comm. 36, 181-189 (2015)
Annealing-Induced Periodic Patterns in Solution Grown Polymer Single Crystals
Bin Zhang, Jingbo Chen, Hui Zhang, Moritz C. Baier, Stefan Mecking, Renate Reiter, Rolf Mülhaupt, Günter Reiter, RSC Advances 5, 12974 (2015)
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