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Neueste Veröffentlichungen
Spatiotemporal Sequence of Interdependent Nucleation Mechanisms in Ultrathin Polymer Films
Da Huang, Rana Bakhshi, Raoul M. D'Anselme, Günter Reiter. Macromolecules, published online
Employing defined starting conditions of ultrathin molten poly(ethylene oxide) films on model solid substrates, we investigated the spatiotemporal sequence of interdependent mechanisms of crystal nucleation. Due to the limited number and the preferred conformation of polymer chains parallel to the substrate, primary nucleation favored edge-on lamellar crystals, which indirectly induced other subsequent nucleation pathways, enabled through the molten polymer chains accumulated at their peripheral fold surfaces. Both additional edge-on lamellar crystals and branched flat-on lamellar crystals were initiated. For long-chain polymers, spatial correlations between lamellar crystals across intervening noncrystalline regions were established through polymer chains incorporated within neighboring lamellae. (more...)
Decai Lin, Zebin Su, Yuxiang Chen, Jianquan Xu, Günter Reiter, Cuiyun Zhang, Xinping Wang. Macromolecules 59 (2026) 4970–4981
Using infrared reflection–absorption spectroscopy and atomic force microscopy, we revealed that polymer–substrate interactions, chain length, and film thickness critically influenced the morphology and orientation of lamellar crystals of poly(l-lactide) (PLLA) grown at a constant temperature. In contrast to the often-observed monotonic change from preferentially flat-on to edge-on crystals upon increasing film thickness, an unprecedented nonmonotonic change in the dominating orientation of lamellar crystals from edge-on to flat-on and back to edge-on was observed. In the thinnest films, size confinement and adsorption-induced alignment of the chains favored the nucleation and growth of edge-on lamellar crystals. Enhanced polymer–substrate interactions promoted the formation of edge-on lamellar crystals in the thinnest films with a higher molecular weight. (more..)
Anmol Arya, Solomon L. Joseph, Francois Vonau, Jean-Luc Bubendorff, Silvia Siegenführ, Laurent Simon, Günter Reiter. J. Phys. Chem. C 2026, 130, 5536–5546
In the course of electrospraying in a vacuum, polymers acquire electric charges, which are distributed along their backbone. Here, we demonstrate that these charges have a strong impact on the molecular ordering and spectroscopic properties of conjugated polymers when deposited on substrates with an insulating oxide layer. To this end, we electrosprayed varying amounts of poly(3-hexylthiophene) (P3HT) onto silicon substrates with oxide layers of different thickness. The resulting morphologies were explored by atomic force microscopy. The corresponding spectroscopic properties, including their changes in time upon illumination, were derived from photoluminescence (PL) measurements. On insulating substrates, charges were retained on the polymer chains, causing long-range electrostatic repulsion and the formation of largely separated droplet-like objects containing multiple chains. These objects exhibited significant PL intensities for photons with a wavelength (λ) less than ca. 600 nm, suggesting the lack of π–π stacking interactions between P3HT chains. (more...)
Reversible Metamorphosis of a Conjugated Polymer Induced by Photoexcitation
Solomon Joseph, Anmol Arya, Günter Reiter. Advanced Photonics Research 7 (2026) e202500311
Optoelectronic properties of materials are frequently examined through spectroscopic tools based on the absorption and emission of (visible) photons. Typically, one assumes that these transient characterization processes do not cause observable change of these properties because of the low power of the employed light sources. However, for flexible conjugated polymers in a medium of low viscosity, it is decidedly unclear whether photoexcitation of electrons on the backbone of a long polymer chain has an influence on macromolecular conformations and the corresponding intermolecular interactions. Here, we provide clear experimental evidence that continuous absorption of photons progressively causes persistent changes in the spectroscopic properties of conjugated polymers, accompanied by microscopically observable changes in their spatial distribution within a low-viscosity matrix. By contrast, all these changes were completely absent in nonilluminated parts of the same sample.(more...)
Temperature dependence of crystal – melt coexistence for supported polyethylene filaments
Da Huang, Thorsten Hugel, Bizan N. Balzer, Günter Reiter. Nature Communications 16 (2025) 11127
The broken symmetry of molecular interactions at interfaces is causing that crystals are often covered by a thin liquid layer of their own melt. Such crystal–melt coexistence can be related to phenomena of surface premelting, secondary nucleation and melting point depression, particularly important for small systems. Here, we employed intermittent-contact mode atomic force microscopy imaging on nanoscopic semi-cylindrical filaments of polyethylene on a substrate to observe that these filaments contained a crystalline core bounded by molten regions of rather uniform width, W_soft= (9 ± 2) nm at room temperature, which increased reversibly with temperature T. Filaments smaller than ca. 2∙W_soft (T) were completely molten. The values of W_soft (T) compared favorably with theoretically predicted characteristic length scales in the context of nucleation, surface premelting and the melting point depression of finite size crystals. Altogether, we show that these three phenomena are related and dominated by the intermolecular forces acting at crystal surfaces. (more...)
Liste der Veröffentlichungen
- 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
- Charge transport in nanoparticle chains influenced by stabilizer molecules
- Leonid V. Govor, Gottfried H. Bauer, Günter Reiter, and Jürgen Parisi. Phys. Status Solidi A, 210, No. 6, 1107–1114 (2013)
- Reversibly slowing dewetting of conjugated polymers by light
- Ioan Botiz, Paul Freyberg, Natalie Stingelin, Arnold Chang-Mou Yang, Günter Reiter. Macromolecules 46, 2352–2356 (2013)
- Directing nuclear deformation on micropillared surfaces by substrate geometry and cytoskeleton organization
- F. Badique, D. R. Stamov, P. Davidson, M. Veuillet, G. Reiter, J.N. Freund, C. M. Franz, K. Anselme. Biomaterials 34, 2991-3001 (2013)
- Linear and Star-Shaped POSS Hybrid Materials Containing Crystalline Isotactic Polystyrene Chains
- Maximilian Vielhauer, Pierre J. Lutz, Günter Reiter und Rolf Mülhaupt. Journal of Polymer Science, Polymer Chemistry 51, 947–953 (2013)
- Generating long supramolecular pathways with a continuous density of states by physically linking conjugated molecules via their end groups
- R. Shokri, M. A. Lacour, J.-P. Lere-Porte, F. Serein-Spirau, K. Miqueu, J.-M. Sotiropoulos, F. Vonau, D. Aubel, M. Cranney, G. Reiter, and L. Simon, J. Am. Chem. Soc. 135, 5693–5698 (2013)