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Mechanism for the Formation of Millimeter-Long Solid Filaments by Spin Coating Dilute Solutions of a Crystallizable Polymer

Da Huang, Thorsten Hugel, and Günter Reiter. Macromolecules, published online

huang.jpgWe have investigated the formation of millimeter-long filaments induced by spin-coating ca. 130 °C dilute para-xylene solutions of rapidly crystallizable polyethylene chains with a contour length in the micrometer range onto ca. 80 °C mica substrates. These filaments were radially oriented and accumulated on the periphery of the substrate. Our observations can be explained by the stretching of polymers through the flow field induced by spinning the solution on a solid substrate. The corresponding loss in conformational entropy emphasized attractive interactions between polymers, which resulted in the formation of bundles and their assembly into long filaments. Caused by a Plateau–Rayleigh-type instability of a liquid coating on a solid filament and due to crystallization, these filaments were decorated with various small-scale structures. (more...)


Competing influences of cooling rate and diluent concentration on crystallization of poly(3-hexylthiophene)

Mina Alizadehaghdam, Farhang Abbasi, Günter Reiter. J. Phys. Chem. C 128 (2024) 4757–4765

mina.jpgCrystallization of poly(3-hexylthiophene) (P3HT) was studied in mixtures of different concentrations of 3-hexylthiophene (3HT) as a diluent. Two coexisting crystal populations, socalled “thin” and “thick” crystals, with melting temperatures differing by more than 10 °C were observed in these mixtures. Intriguingly, the “thick” crystals represented transient unstable structures, with a mass fraction that was the highest ФH for rapidly crystallized P3HT in presence of significant amount of diluent. Reflecting its dependence on growth kinetics, ФH decreased with increasing crystallization temperature, extended crystallization time or lower cooling rate. The presence of a diluent led to a “depression” of the melting temperature, described by Raoult’s law and the Flory equation, which was similar for P3HT samples crystallized in various ways. (more...)


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...)

 

Liste der Veröffentlichungen

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)
Anisotropic Photophysical Properties of Highly Aligned Crystalline Structures of a Bulky Substituted Poly(thiophene)
Yingying Wang, Barbara Heck, Daniel Schiefer, John O. Agumba, Michael Sommer, Tao Wen, and Günter Reiter. ACSMacroLett. 3, 881-885 (2014)
Cellulose nanocrystals’ production in near theoretical yields by 1-butyl-3-methylimidazolium hydrogen sulfate ([Bmim]HSO4) – mediated hydrolysis
Jia Mao, Barbara Heck, Günter Reiter, Marie-Pierre Laborie. Carbohydrate Polymers 117, 443–451 (2015)
Correlating polymer crystals via self-induced nucleation
Hui Zhang, Muhuo Yu, Bin Zhang, Renate Reiter, Maximilian Vielhauer, Rolf Mülhaupt, Jun Xu, Günter Reiter. PhysRevLett 112, 237801 (2014)
Nickel Catalyst with a Hybrid P, N Ligand for Kumada Catalyst Transfer Polycondensation of Sterically Hindered Thiophenes
Daniel Schiefer, Tao Wen, Yingying Wang, Pierre Goursot, Hartmut Komber, Ralf Hanselmann, Pierre Braunstein, Günter Reiter, Michael Sommer. ACSMacroLett. 3, 617-621 (2014)
Tunneling Spectroscopy Measurements on Hydrogen-Bonded Supramolecular Polymers
François Vonau, Dominique Aubel, Laurent Bouteiller, Roozbeh Shokri, Günter Reiter, Olga Guskova, Laurent Simon. Nanoscale 6, 8250 (2014)
Pattern Formation on Single Crystals of Isotatic Polystyrene in Thin Films
Hui Zhang. Inaugural-Dissertation zur Erlangung des Doktorgrades der Fakultät für Mathematik und Physik der Albert-Ludwigs-Universität Freiburg, 2014
Investigation of Structure Formation and Reorganization of Polymer Crystals
Bin Zhang. Inaugural-Dissertation zur Erlangung des Doktorgrads der Fakultät für Chemie und Pharmazie, 2014
Anisotropic charge transport in large single crystals of π-conjugated organic molecules
Wael Hourani, Khosrow Rahimi, Ioan Botiz, Felix Peter Vinzenz Koch, Günter Reiter, Peter Lienerth, Thomas Heiser, Jean-Luc Bubendorff, and Laurent Simon. Nanoscale 6, 4774 (2014)
Crystallization of Poly(γ-benzyl L-glutamate) in Thin Film Solutions: Structure and Pattern Formation
Kaiwan Jahanshahi, Ioan Botiz, Renate Reiter, Ralf Thomann, Barbara Heck, Roozbeh Shokri, Werner Stille and Günter Reiter. Macromolecules 46, 1470-1476 (2013)
Light absorption of poly(3-hexylthiophene) single crystals
Khosrow Rahimi, Ioan Botiz, John O. Agumba, Sajedeh Motamen, Natalie Stingelin, Günter Reiter. RSC Adv. 4, 11121 (2014)
Some unique features of polymer crystallisation
Günter Reiter. Chem. Soc. Rev., 43, 2055-65 (2014), DOI: 10.1039/C3CS60306G
Reversible Crystallization and Dissolution of Poly(γ-benzyl L-glutamate) in Thin Film Solutions via Addition and Removal of a Nonsolvent
Kaiwan Jahanshahi. Inaugural-Dissertation zur Erlangung des Doktorgrades der Fakultät für Mathematik und Physik der Albert-Ludwigs-Universität Freiburg, 2013
Massive Enhancement of Photoluminescence through Nanofilm Dewetting
Peiwei Lee, Wei-Cheng Li, Bin-Jih Chen, Chih-Wei Yang, Chun-Chih Chang, Ioan Botiz, Günter Reiter, Tsang-Lang Lin, Jau Tang, and Arnold Chang-Mou Yang. ACS Nano 7, 6658–6666 (2013)
Reversible Nucleation, Growth and Dissolution of Poly(γ-benzyl L-glutamate) Hexagonal Columnar Liquid Crystals by Addition and Removal of a Nonsolvent
Kaiwan Jahanshahi, Ioan Botiz, Renate Reiter, Harald Scherer, Günter Reiter. Cryst. Growth Des. 13, 4490−4494 (2013)
高分子物理——“结构与性能”背后的概念
作者:(德)斯特罗伯 (Strobl, Gert R), ISBN(书号) 978-7-111-37670-5, 丛书名:时代教育·国外高校优秀教材精选, 北京:机械工亚出版社(2012)
Self-Assembly of Supra-Molecular Systems on Graphene or Graphite
Roozbeh Shokri. Inaugural-Dissertation zur Erlangung des Doktorgrades der Fakultät für Mathematik und Physik der Albert-Ludwigs-Universität Freiburg, 2013
Competition of crystal nucleation to fabricate the oriented semi-crystalline polymers
Yijing Nie, Huanhuan Gao, Muhuo Yu, Zuming Hu, Günter Reiter, Wenbing Hu. Polymer 54, 3402-3407 (2013)
Controlling the Crystal Growth and Morphology of Conjugated Polymers
Khosrow Rahimi. Inaugural-Dissertation zur Erlangung des Doktorgrades der Fakultät für Mathematik und Physik der Albert-Ludwigs-Universität Freiburg, 2013
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