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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

Aging of thin polymer films cast from a near-theta solvent
Adam Raegen, Mithun Chowdhury, Christophe Calers, Alexander Schmatulla, Ullrich Steiner, and Günter Reiter. Phys. Rev. Letters 105, 227801 (2010)
Spreading of Liquids on Substrates
Günter Reiter. In Handbook of Adhesion Technology. Eds. Lucas Filipe Martins da Silva, Andreas Öchsner, Robert Adams. Springer 2011
Systematic Control of Nucleation Density in Poly(3-hexylthiophene) Thin Films
Edward J. W. Crossland, Khosrow Rahimi, Günter Reiter, Ullrich Steiner, and Sabine Ludwigs. Advanced Functional Materials 21, 518–524 (2011)
Possible origin of thickness-dependent deviations from bulk properties of thin polymer films
Günter Reiter, Simone Napolitano. Journal of Polymer Science Part B: Polymer Physics 48, 2544-2547 (2010)
Surface-induced breakout crystallization in cylinderforming P(I-b-EO) diblock copolymer thin films
C.M. Papadakis, C. Darko, Z. Di, K. Troll, E. Metwalli, A. Timmann, G. Reiter, and S. Förster. European Physical Journal E 34, 7 (2011)
Topographically induced self-deformation of the nuclei of cells: dependence on cell type and proposed mechanisms
Patricia M. Davidson, Olivia Fromigue, Pierre J. Marie, Vasif Hasirci, Günter Reiter, Karine Anselme. J. Mater. Sci.: Mater. Med. 21, 939-946 (2010)
Accelerating Dewetting on Deformable Substrates by Adding a Liquid Underlayer
Lin Xu, Günter Reiter, Tongfei Shi and Lijia An. Langmuir 26, 7270–7276 (2010)
高分子の物理―構造と物性を理解するために (単行本)
G.R. ストローブル (著), Gert R. Strobl (原著), 深尾 浩次 (翻訳), 宮地 英紀 (翻訳), 宮本 嘉久 (翻訳), 林 久夫 (翻訳). 出版社: シュプリンガー・フェアラーク東京 (1998/2010) ISBN 978-4431707950
Two Competing Crystallization Modes in a Smectogenic Polyester
Barbara Heck, Ernesto Perez and Gert Strobl. Macromolecules 43, 4172-4183 (2010)
Oriented crystallization of isotactic polystyrene in films prepared by friction transfer
K. Jradi, S. Bistac, M. Schmitt, G. Reiter. Polymer 50, 3724-3729 (2009)
Enhancing nucleation and controlling crystal orientation by rubbing/scratching the surface of a thin polymer film
K. Jradi, S. Bistac, M. Schmitt, A. Schmatulla, G. Reiter. Eur. Phys. J. E 29, 383-389 (2009)
Microstructured Surfaces Cause Severe but Non-Detrimental Deformation of the Cell Nucleus
Patricia M. Davidson, Hayriye Ozcelik, Vasif Hasirci, Guenter Reiter, Karine Anselme. Advanced Materials 21, 3586 (2009)
On the mechanics of rim instabilities in viscoelastic polymer thin films
S. Gabriele, S. Coppee, G. Reiter, P. Damman. Eur. Phys. J.-Special Topics 166, 55-61 (2009)
Crystallization in diblock copolymer thin films at different degrees of supercooling
C. Darko, I. Botiz, G. Reiter, D.W. Breiby, J.W. Andreasen, S. V. Roth, D.-M. Smilgies, E. Metwalli, C.M. Papadakis. Phys. Rev. E 79, 041802 (2009)
Branched substituents generate improved supramolecular ordering in physisorbed molecular assemblies
F. Vonau, M. Linares, B. Isare, D. Aubel, M. Habar, L. Bouteiller, G. Reiter, V. Geskin, F. Zerbetto, R. Lazzaroni, L. Simon. J. Phys. Chem. C 113, 4955-4959 (2009)
Polymer crystallization under nano-confinement of droplets studied by molecular simulations
Wenbing Hu, Tao Cai, Yu Ma, Jamie K. Hobbs, O. Farrance, Günter Reiter. Faraday Discussions 143, 129-141 (2009)
Cloning Polymer Single Crystals through Self-seeding
Jianjun Xu, Yu Ma, Wenbing Hu, Matthias Rehahn, and Günter Reiter. Nature Materials 8, 348-353 (2009)
Structuring the Surface of Crystallizable Polymers with an AFM Tip
Cvetlin Vasilev, Günter Reiter, Khalil Jradi, Sophie Bistac, Marjorie Schmitt. In: "Scanning Probe Microscopy in Nanoscience and Nanotechnology" Part 3, Ed. Bharat Bhushan, "NanoScience and Technology" Series, Springer 2010, ISBN 978-3-642-03534-0
Visualizing properties of polymers at interfaces: Relations between molecular features and macroscopic behaviour
Günter Reiter. In “Soft Matter: Scattering, Imaging and Manipulation”, Volume IV: Imaging and Manipulation Techniques Eds.: R. Pecora, R. Borsali, Springer 2008, ISBN 978-1402044649
Some general remarks on crystallization in the presence of additives
Günter Reiter and Jean-Georges Barth. Elemente der Naturwissenschaft 92, 39-61 (2010)
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