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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

Molecular-Dynamics in Perfluoro-n-Eicosane. 4. Oscillatory and Diffusive Rotational Motion
M. Kimmg, R. Steiner, G. Strobl, B. Stühn. Journal of Chemical Physics 99, 8105-8114 (1993)
Ellipsometric characterisation of streptavidin binding to biotin-functionalized monolayers at the air-water interface
R. Reiter, H. Motschmann, W. Knoll. Langmuir 9, 2430-2435 (1993)
Pretransitional nematic surface order in the isotropic phase of phenylcyclohexanes
S. Immerschitt, T. Koch, W. Stille and G. Strobl. J. Chem. Phys. 96, 6249 (1992)
Formation of Silver Islands on Langmuir-Blodgett Films as Investigated by X-ray Reflectometry
G. Reiter, C.Bubeck, M. Stamm. Langmuir 8, 1881 (1992)
Dewetting of Thin Polymer Films
G. Reiter. Physical Review Letters 68, 75 (1992)
Application of 15N Nuclear Reaction Technique for Hydrogen Analysis in Polymer Thin Films
D. Endisch, F. Rauch, A. Götzelmann, G. Reiter, M. Stamm. Nuclear Instruments and Methods in Physics Research B62, 513 (1992)
Use of Ellipsometry in a Study of the Surface Order in the Isotropic Phase of a Liquid Crystalline Polyacrylate
S. Immerschitt, W. Stille, and G. Strobl. Macromolecules 25, 3227 (1992)
Light-Scattering Study of Fluctuations oin Concentration, Density, and Local Anisotropy in Polystyrene Dioxane Mixtures
T. Koch, G. Strobl, B. Stühn. Macromulecules 25, 6255-6261 (1992)
Neutron-Scattering Study of Segmental Dynamics in the Disordered Regions of Partially Crystalline Polyethylene
G. Hohlweg, B. Holzer, W. Petry, G. Strobl, B. Stühn. Macromolecules 25, 6248-6254 (1992)
Ellipsometric microscopy: Imaging monomolecular surfactant layers at the air-water interface
R. Reiter, H. Motschmann, H. Orendi, A. Nemetz, W. Knoll. Langmuir 8, 1784-1788 (1992)
The Effect of Short and Long Range Interactions on the Break up and Dewetting of Thin Polymer Films
G. Reiter. Proceedings of the MRS Fall meeting 1991, Boston, USA
TOREMA - A Neutron Reflectometer at Jülich
M. Stamm, S. Hüttenbach, G. Reiter. Physica B 173, 11 (1991)
The Use of X-ray and Neutron Reflectometry for the Investigation of Polymeric Thin Films
M. Stamm, G. Reiter, K. Kunz. Physica B 173, 35 (1991)
The Interface between 2 Strongly Incompatible Polymers
S. Hüttenbach, M. Stamm, G. Reiter, M. Foster. Langmuir 7, 2438 (1991)
Initial Stages of Polymer Interdiffusion Studied by Neutron Reflectometry
M. Stamm, S. Hüttenbach, G. Reiter, T. Springer. Europhys. Lett. 14, 451 (1991)
Measurements of Polymer Diffusion Over Small Distances: A Check of Reptation Arguments
G. Reiter, U. Steiner. J. Phys. (France) II 1, 659-671 (1991)
Time Regimes in Polymer Interdiffusion Determined by Marker Movement
G. Reiter, S. Hüttenbach, M. Foster, M. Stamm. Macromolecules 24, 1179 (1991)
X-ray and Neutron Reflectometry for the Investigation of Polymer Diffusion
G. Reiter, S. Hüttenbach, M. Foster, M. Stamm. Fresenius J. Anal. Chem. 341, 284-288 (1991)
Molecular-Dynamics in Perfluoro-n-Eicosane. 3. Oscillatory and Diffusive Translational Motion
T. Albrecht, R. Jäger, W. Petry, R. Steiner, G. Strobl, B. Stühn. Journal of Chemical Physics 95, 2817-2822 (1991)
Molecular-Dynamics in Perfluoro-n-Eicosane. 2. Components of Disorder
T. Albrecht, H. Elben, R. Jäger, M. Kimmig, R. Steiner, G. Strobl, B. Stühn, H. Schwickert, C. Ritter. Journal of Chemical Physics 95, 2807-2816 (1991)
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