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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

Lamellar Crystal Orientations Biased by Crystallization Kinetics in Polymer Thin Films
Yu Ma, Wenbing Hu, Günter Reiter. Macromolecules 39, 5159-5164 (2006)
Disentanglement Time of Polymers Determines the Onset of Rim Instabilities in Dewetting
Sylvain Gabriele, Séverine Sclavons, Günter Reiter, Pascal Damman. Phys. Rev. Lett. 96, 156105 (2006)
The Formation of Ordered Polymer Structures at Interfaces
J.-U. Sommer and G. Reiter Advances in Polymer Science, 200, 1-36 (2006)
Elastomer polymer brushes on flat surface by bimolecular surface-initiated nitroxide mediated polymerization
Julien Parvole, Jean-Pierre Montfort, Günter Reiter, Oleg Borisov, Laurent Billon. Polymer, 47, 972-981 (2006)
The role of nonlinear friction in the dewetting of thin polymer films
T. Vilmin, E. Raphaël, P. Damman, S. Sclavons, S. Gabriele, M. Hamieh, G. Reiter. Europhys. Lett. 73, 906 - 912 (2006)
Self-Assembly of Nanoparticle Ring Patterns
Jürgen Parisi, Leonid V. Govor, Gottfried H. Bauer, Günter Reiter. Zeitschrift für Naturforschung Section A, A journal of physical sciences 61, 99-102 (2006)
Bilayer formation in thin film of a binary solution
Leonid V. Govor, Günter Reiter, Gottfried H. Bauer, Jürgen Parisi. Physics Letters A 353, 198–204 (2006)
Ordered Polymeric Nanostructures at Surfaces
Editors: G. Julius Vancso and Günter Reiter. Advances in Polymer Science 200 (2006), Springer Berlin/Heidelberg, ISBN: 3-540-31921-2, DOI: 10.1007/11605294, ISSN: 0065-3195 (Paper) 1436-5030 (Online)
Amorphous Thin Polymers Films: Consequences of Residual Stresses
G. Reiter, M. Hamieh, S. Al Akhrass, S. Sclavons, S. Gabriele, P. Damman, T. Vilmin, E. Raphaël. Makromolekulares Kolloquium Freiburg, “Macromolecular Bioscience”. 6 (2), F95 (2006)
Treelike branched structures formed in dewetting thin films of a binary solution
Leonid V. Govor, Günter Reiter, Gottfried H. Bauer, Jürgen Parisi. Appl. Phys. Lett. 89, 133126 (2006)
Self-assembled tree-like patterns from an evaporating binary solution
Leonid V. Govor, Günter Reiter, Gottfried H. Bauer, Jürgen Parisi. Phys. Rev. E 74, 061603 (2006)
Crystallization of block copolymers in restricted cylindrical geometries
Cvetelin Vasilev, Günter Reiter, Stergios Pispas, Nikos Hadjichristidis Polymer, 47, 330-340 (2006)
Network stretching during tensile drawing of polyethylene: A study using X-ray scattering and microscopy
Ke Hong, Gert Strobl. Macromulecules 39, 268-273 (2006)
Temperature dependent variations in the lamellar structure of poly(L-lactide)
Tai-Yon Cho, Gert Strobl. Polymer 47, 1036-1043 (2006)
Viscous-force-dominated tensile deformation behavior of oriented polyethylene
B. Na, Q. Zhang, Q. Fu, Y.F. Men, K. Hong, G. Strobl. Macromolecules 39, 2584-2591 (2006)
Low-field NMR studies of polymer crystallization kinetics: changes in the melt dynamics
C. Hertlein, K.Saalwächter, G. Strobl. Polymer 47, 7216 (2006)
Crystallization and Melting of Bulk Polymers: New Observations, Conclusions and a Thermodynamic Scheme
Gert Strobl. Prog. Polym. Sci. 31, 398 (2006)
Time dependent light attenuation measurements used in studies of the kinetics of polymer crystallization
Barbara Heck, Takahiko Kawai, Gert Strobl. Polymer 47, 5538-5543 (2006)
凝縮系物理学: 結晶からソフトマターへ
G. ストローブル (著), 田口 健 (翻訳), 深尾 浩次 (翻訳). 出版社: シュプリンガー・ジャパン(株) 2006, ISBN 978-4431712206
Variation of the Network Anisotropy of Cholesteric Side Chain Elastomers
Christian Bourgerette, Bin Chen, Heino Finkelmann, Michel Mitov, Jürgen Schmidtke, Werner Stille. Macromolecules 39, 8163 (2006)
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