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Neueste Veröffentlichungen
The size of critical secondary nuclei of polymer crystals does not depend on supersaturation
Yang Liu, Zhiqi Wang, Yao Zhang, Tianyu Wu, Tianze Zheng, Bao Hua Guo, Günter Reiter, Jun Xu. Nature Communications 16 (2025) 3773
It is still a great challenge to determine the size of critical nuclei, which is crucial for a comprehensive understanding of crystallization and for testing the controversial crystallization theories. Here, we propose a method to determine the size of critical secondary nuclei on growth faces of poly(butylene succinate) single crystals in solution, basing on the probability of statistically selecting crystallizable units in random copolymers. In a dilute solution and for a given crystallization temperature, we reveal that the size of critical secondary nuclei was independent of supersaturation, contrary to the well-accepted prediction of existing theories which expect that the size of the critical nucleus increases with decreasing supersaturation. Accounting correctly for the dilution-caused change in the steady-state concentration of clusters of various sizes, we remedy inconsistencies of existing theoretical approaches in deriving the correct size of critical secondary nuclei in solution being independent of supersaturation. (more...)
Binghua Wang, Hailong Zou, Xuchen Wang, Changyu Shen, Jingbo Chen, Günter Reiter, Bin Zhang. Nature Communications 16 (2025) 3275
The dissolution of polymer crystals often proceeds at rates varying in time and space. Here, using low molecular weight poly(ethylene oxide) as a model polymer, we exploit step-wise selective dissolution for unveiling how spatial variations in metastability are generated during the growth of lamellar polymer single crystals. The dissolution velocity along defined crystal faces is constant, but ca. 5 times faster for rough than for smooth faces. From the temperature dependence of dissolution, we derive detachment energies of 420 ± 40 kJ/mol and 650 ± 50 kJ/mol for rough and smooth faces, respectively, suggesting that on a rough face polymer chains have ca. 1/3 less neighboring molecules to interact with. The observed high values of the activation energy indicate that, for dissolving a polymer crystal, the progressive detachment of whole chains is indispensable. Our study reveals a strong relation between growth kinetics and the resulting metastability of polymer crystals. (more...)
Baode Zhang, Snežana D. Zarić, Sonja S. Zrilić, Iosif Gofman, Barbara Heck, Günter Reiter. Communications Chemistry 8 (2025) 21
The interplay between attractive London dispersion forces and steric effects due to repulsive forces resulting from the Pauli principle often determines the geometry and stability of nanostructures. Aromatic polyimides (PI) and carbon nanotubes (CNT) were chosen as building blocks as two components in the hetero delocalized electron nanostructures. Two PIs, having the same diamine part and different linkage substituents between two phenyl rings of dianhydride part, one linked with ether bond (C-O-C) (OPI), the other with C-(CF3)2 (FPI), were investigated. Surprisingly, two CNT/PI nanocomposites show distinct failure mode from CNT yielding to CNT pull-out failure. Calculation of the interaction energy and chain conformations of each PI upon CNT was performed by accurate density functional theory (DFT) calculations and molecular dynamic simulation (MDS). (more...)
Valentina Pirela, Leire Unanue, Justine Elgoyhen, Javier Ramos, Juan Francisco Vega, Agurtzane Mugica, Manuela Zubitur, Cuong Minh Quoc Le, Abraham Chemtob, Radmila Tomovska, Günter Reiter, Jaime Martín, Alejandro J. Müller. European Polymer Journal (2025) 113721
This work studies how the chemical structure of relatively similar high-sulfur alternating polythioether homopolymers (DMDS-alt-DVE, DMDS-alt-TEGDVE, and DMDS-alt-BDDVE) affects their structural properties, morphology, polymorphism, and crystallization kinetics. Differential scanning calorimetry (DSC) and polarized light optical microscopy (PLOM) experiments revealed a complex crystallization for the samples in which up to three different polymorphic phases were identified: a very low melting crystal form (VL-Tm form), a low melting crystal form (L-Tm form) and a high melting crystal form (H-Tm form), characterized by their corresponding melting temperature ranges and confirmed via Wide-Angle X-ray Scattering (WAXS). A coexistence of negative and positive spherulites was found, and their origin was revealed by atomic force microscopy (AFM), which showed how the lamellar arrangement varied in the samples from predominantly radial to a cross-hatched morphology. (more...)
Liste der Veröffentlichungen
- Growth Kinetics of Stacks of Lamellar Polymer Crystals
- Sumit Majumder, Hanna Busch, Purushottam Poudel, Stefan Mecking, and Günter Reiter. Macromolecules 51 (2018) 8738–8745
- Self-Interference of Exciton Emission in Organic Single Crystals Visualized by Energy-Momentum Spectroscopy
- Christian Schörner, Sajedeh Motamen, Laurent Simon, Günter Reiter, Richard Hildner. ACS Omega 3 (2018) 6728–6736
- Formation of Periodically Modulated Polymer Crystals
- Purushottam Poudel, Sumit Majumder, Sivasurender Chandran, Hui Zhang, Günter Reiter. Macromolecules 51 (2018) 6119–6126
- Generating Nanoscopic Patterns in Conductivity Within a Poly(3-hexylthiophene) Crystal Via Bias-controlled Scanning Probe Nanolithography
- Binghua Wang, Bin Zhang, Changyu Shen, Jingbo Chen, Günter Reiter. Macromolecules 51 (2018) 7692-7698
- Systematic Control of Self-Seeding Crystallization Patterns of Poly(ethylene oxide) in Thin Films
- Binghua Wang, Shaohua Tang, Yan Wang, Changyu Shen, Renate Reiter, Günter Reiter, Jingbo Chen, Bin Zhang. Macromolecules 51, 1626–1635 (2018)
- Tuning relaxation dynamics and mechanical properties of polymer films of identical thickness
- Marwa Kchaou, Pierre Alcouffe, Sivasurender Chandran, Philippe Cassagnau, Günter Reiter, and Samer Al Akhrass. Phys. Rev. E 97, 032507 (2018)
- Highly n-doped graphene generated through intercalated terbium atoms
- L. Daukiya, M. N. Nair, S. Hajjar-Garreau, F. Vonau, D. Aubel, J. L. Bubendorff, M. Cranney, E. Denys, A. Florentin, G. Reiter, and L. Simon. Phys. Rev. B 97, 035309 (2018)
- Formation of Periodically Modulated Polymer Crystals
- Purushottam Poudel. Inauguraldissertation 2018
- Pneumatically Controlled Nanofluidic Devices for Contact-Free Trapping and Manipulation of Nanoparticles
- Michael Adrian Gerspach, Nassir Mojarad, Deepika Sharma, Yasin Ekinci,and Thomas Pfohl. Part. Part. Syst. Charact. 2018, 1800161
- Monitoring single-cell gene regulation under dynamically controllable conditions with integrated microfluidics and software
- M. Kaiser, F. Jug, T. Julou, S. Deshpande, T. Pfohl, O. K. Silander, G. Myers, E. van Nimwegen, Nature Communications 9, 212 (2018)
- Growth Kinetics of Stacks of Lamellar Crystals in Polymer Thin Films
- Sumit Majumder. Inauguraldissertation 2018
- Optical studies on indicators of order and disorder in films and crytals of a bulky substituted polythiophene
- Fanuel Mugwanga Keheze. Inauguraldissertation 2018
- Multiple structural transitions in Langmuir monolayers of charged soft-shell nanoparticles
- Ahmed El-Tawargy, David Stock, Markus Gallei, Wael Ramadan, Mamdoh Shams El-Din, Günter Reiter, Renate Reiter. Langmuir 34, 3909−3917 (2018)
- Thermodynamic origin of multi-layer structures in Langmuir polymer films
- Volker Knecht, Günter Reiter, Renate Reiter. Langmuir 33 (2017) 11399–11405
- Structure Formation in Langmuir Peptide Films As Revealed from Coarse-Grained Molecular Dynamics Simulations
- Volker Knecht, Günter Reiter, Helmut Schlaad, and Renate Reiter. Langmuir 33 (2017) 6492-6502
- Schnecken als lebende 3D-Drucker: freie Formen für die Architektur von morgen
- Christoph Allgaier, Benjamin Felbrich, Frederik Wulle, Emna Khechine, James H. Nebelsick, Achim Menges, Günter Reiter, Renate Reiter, Armin Lechler, Alexander Verl, Karl-Heinz Wurst. Baubionik – Biologie beflügelt Architektur, Publisher: Naturkundemuseum Stuttgart 2017
- Signatures of Melting and Recrystallization of a Bulky Substituted Poly(thiophene) Identified by Optical Spectroscopy
- Fanuel Keheze, Dominic Raithel, Tianyu Wu, Daniel Schiefer, Michael Sommer, Richard Hildner, Günter Reiter. Macromolecules 50 (2017) 6829–6839
- Triple-Shape Memory Materials via Thermoresponsive Behavior of Nanocrystalline Non-Isocyanate Polyhydroxyurethanes
- Vitalij Schimpf, Barbara Heck, Günter Reiter, Rolf Mülhaupt. Macromolecules 50 (2017) 3598–3606
- Semicrystalline long-chain polyphosphoesters from polyesterification
- Hanna Busch, Sumit Majumder, Guenter Reiter, Stefan Mecking. Macromolecules 50 (2017) 2706–2713
- Blocking of injected holes at the charge extracting interface
- L. Govor, G. Reiter, J. Parisi. Journal of Physics, Condensed Matter 29 (2017) 025001