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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

Manipulating the dewetting dynamics of polymer films by creating non-equilibrium conformational states at the interface
Adrian Linn, Master Thesis 2017
Induziertes gerichtetes Kristallwachstum einer kristallisierbaren Polymerkomponente innerhalb eines nicht-kristallisierbaren Polymernetzwerks und Untersuchung der resultierenden mechanischen Energie
Stephan Laule. Inauguraldissertation 2017
Self-Assembly and Polymerization of Diacetylene Molecules on Epitaxial Graphene
Fallou Fall, Inaugural-Dissertation zur Erlangung des Doktorgrads der Fakultät für Mathematik und Physik der Universität Freiburg, 2017
Vesicle Origami and the Influence of Cholesterol on Lipid Packing
Radu Tanasescu, Martin A. Lanz, Dennis Mueller, Stephanie Tassler, Takashi Ishikawa, Renate Reiter, Gerald Brezesinski, and Andreas Zumbuehl. Langmuir 32 (2016) 4896−4903
Self-assembly behavior of a rod-like polypeptide at the air-water interface
Renate Reiter, Frédéric Wintzenrieth, Günter Reiter. Polymer 107 (2016) 379–386
Covalent Functionalization by Cycloaddition Reactions of Pristine Defect-Free Graphene
L. Daukiya, C. Mattioli, D. Aubel, S. Hajjar-Garreau, F. Vonau, E.Denys, G. Reiter, J. Fransson, E. Perrin, M-L. Bocquet, C. Bena, A. Gourdon, and L. Simon. ACS Nano 11 (2017) 627–634
How Molecules with Dipole Moments Enhance the Selectivity of Electrodes in Organic Solar Cells – A Combined Experimental and Theoretical Approach
Uli Würfel, Martin Seßler, Moritz Unmüssig, Nils Hofmann, Mathias List, Eric Mankel, Thomas Mayer, Günter Reiter, Jean-Luc Bubendorff, Laurent Simon, and Markus Kohlstädt. Adv. Energy Mat. 1600594 (2016)
Flow-Induced Dendritic β-Form Isotactic Polypropylene Crystals in Thin Films
Bin Zhang, Binghua Wang, JiaJia Chen, Changyu Shen, Renate Reiter, Jingbo Chen, and Günter Reiter. Macromolecules 49 (2016) 5145−5151
Assembling semiconducting molecules by covalent attachment to a lamellar crystalline polymer substrate
Rainhard Machatschek, Patrick Ortmann, Renate Reiter, Stefan Mecking and Günter Reiter. Beilstein J. Nanotechnol. 7 (2016) 784–798
When hole extraction determines charge transfer across metal-organic-metal structure
L. V. Govor, G. Reiter and J. Parisi, EPL, 113 (2016) 57002
Influence of interfacial trap states on injecting and extracting of charges across a metal-organic interface
L.V. Govor, G. Reiter and J. Parisi. J. Phys. D: Appl. Phys. 49 (2016) 135306
Continuous Fused Deposition Modelling of Architectural Envelopes Based on the Shell Formation of Molluscs: A Research Review
James H. Nebelsick, Christoph Allgaier, Benjamin Felbrich, Daniel Coupek, Renate Reiter, Günter Reiter, Achim Menges, Armin Lechler, Karl-Heinz Wurst. In book: Biomimetic Research for Architecture and Building Construction. Eds. Jan Knippers, Klaus Nickel, Thomas Speck. Springer 2016
Tunneling of charge carriers across a gold–squaraine interface
L.V. Govor, G. Reiter and J. Parisi, Physics Letters A 380 (2016) 1493–1498
Intrinsic Stresses in Thin Glassy Polymer Films Revealed by Crack Formation
Mithun Chowdhury, Xiaoyuan Sheng, Falko Ziebert, Arnold C.-M. Yang, Alessandro Sepe, Ullrich Steiner, and Günter Reiter. Macromolecules 49 (2016) 9060−9067
Revealing Order and Disorder in Films and Single Crystals of a Thiophene-Based Oligomer by Optical Spectroscopy
Sajedeh Motamen, Dominic Raithel, Richard Hildner, Khosrow Rahimi, Thibaut Jarrosson, Françoise Serein-Spirau, Laurent Simon, and Günter Reiter. ACS Photonics 3 (2016) 2315–2323
Poly(2,5-dioctylphenyl-3-thiophene) synthesized by direct arylation polycondensation: End groups, defects and crystallinity
Daniel Schiefer, Hartmut Komber, Fanuel Mugwanga Keheze, Susanna Kunz, Ralf Hanselmann, Guenter Reiter, Michael Sommer. Macromolecules 49 (2016) 7230-7237
Transient cooperative processes in dewetting polymer melts
Sivasurender Chandran, Günter Reiter, PRL 116 (2016) 088301
Crystallization and Resulting Optical Properties of Thiophene-Based Oligomers
Sajedeh Motamen. Inaugural-Dissertation zur Erlangung des Doktorgrads der Fakultät für Mathematik und Physik der Universität Freiburg, 2016
Large area crystal surfaces of precisely sidebranched polyethylenes: Preparation, surface order and functionalization
Rainhard Machatschek. Inaugural-Dissertation zur Erlangung des Doktorgrades der Fakultät für Chemie und Pharmazie der Albert-Ludwigs-Universität Freiburg im Breisgau, 2016
Probing the Elasticity of Langmuir Polymer Films of High Molecular Weight Poly (γ-benzyl-L-glutamate)
Emna Khechine. Master Thesis im Studiengang M.Sc. Sustainable Materials, 2016
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