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Recent Publications

 

Heat dissipation in Sm3+ and Zn2+co‑substituted magnetite (Zn0.1SmxFe2.9‑xO4) nanoparticles coated with citric acid and pluronic F127 for hyperthermia application

S. Shatooti,  M. Mozaffari, G. Reiter, D. Zahn and S. Dutz. Scientific Reports 11 (2021) 16795

2021-rei-09.jpgIn this work, Sm3+ and Zn2+ co‑substituted magnetite Zn0.1SmxFe2.9‑xO4 (x = 0.0, 0.01, 0.02, 0.03, 0.04 and 0.05) nanoparticles, have been prepared via co‑precipitation method and were electrostatically and sterically stabilized by citric acid and pluronic F127 coatings. The coated nanoparticles were well dispersed in an aqueous solution (pH 5.5). Magnetic and structural properties of the nanoparticles and their ferrofluids were studied by different methods. XRD studies illustrated that all as‑prepared nanoparticles have a single phase spinel structure, with lattice constants affected by samarium cations substitution. [more...]


 

Controlled Switching from the Growth of Monolamellar Polymer Crystals to the Formation of Stacks of Uniquely Oriented Lamellae

Weixiang Chen, Brahim Bessif, Renate Reiter, Jun Xu, and Günter Reiter. Macromolecules 54 (2021) 8135–8142

2021-rei-08.jpgWe have used a rationally designed two-step crystallization approach to induce the formation of stacks of superposed and uniquely oriented flat-on polymer lamellae exclusively and controllably at the periphery of monolamellar polymer crystals. The probability of initiating such stacks of lamellar crystals via self-induced nucleation was controlled by the crystallization temperature, which in turn, determined the width of crystalline branches through the Mullins-Sekerka instability. [more...]


 

Measurements of periodically perturbed dewetting force fields and their consequences on the symmetry of the resulting patterns

Konstantinos Roumpos, Sarah Fontaine, Thomas Pfohl, Oswald Prucker, Jürgen Rühe, and Günter Reiter. Scientific Reports 11 (2021) 13149

2021-rei-02.jpgWe studied the origin of breaking the symmetry for moving circular contact lines of dewetting polymer films suspended on a periodic array of pillars. There, dewetting force fields driving polymer flow were perturbed by elastic micro-pillars arranged in a regular square pattern. Elastic restoring forces of deformed pillars locally balance driving capillary forces and broke the circular symmetry of expanding dewetting holes. The observed envelope of the dewetting holes reflected the symmetry of the underlying pattern, even at sizes much larger than the characteristic period of the pillar array, demonstrating that periodic perturbations in a driving force field can establish a well-defined pattern of lower symmetry. For the presented system, we succeeded in squaring the circle. [more...]



Surface-modified elastomeric nanofluidic devices for single nanoparticle trapping

Deepika Sharma, Roderick Y. H. Lim, Thomas Pfohl and Yasin Ekinci. Microsystems & Nanoengineering 7 (2021) 46

pfohl-02.jpgOur work focuses on the development of simpler and effective production of nanofluidic devices for high-throughput charged single nanoparticle trapping in an aqueous environment. Single nanoparticle confinement using electrostatic trapping has been an effective approach to study the fundamental properties of charged molecules under a controlled aqueous environment. Conventionally, geometry-induced electrostatic trapping devices are fabricated using SiOx-based substrates and comprise nanochannels imbedded with nanoindentations such as nanopockets, nanoslits and nanogrids. These geometry-induced electrostatic trapping devices can only trap negatively charged particles, and therefore, to trap positively charged particles, modification of the device surface is required. [more...]



Continuous Illumination of a Conjugated Polymer Causes Strong Enhancement of Photoluminescence

jp1c01837_0009.jpgYaser AlShetwi, Daniel Schiefer, Michael Sommer. Günter Reiter. J. Phys. Chem. B 125 (2021) 5636–5644

We present measurements of absorbance and photoluminescence (PL) for films of poly(3-(2,5-dioctylphenyl)thiophene) (PDOPT) as a function of temperature (T) and time (t) of illumination. While having no detectable influence on absorbance of this conjugated polymer, our experiments clearly revealed that illumination of PDOPT caused a significant increase in the PL intensity (IPL(T,t)), that is, the emission probability of PDOPT. Without illumination, we always observed a decrease in IPL with time. An increase in IPL was only detectable when the sample was illuminated. [more...]



Self-Seeding Procedure for Obtaining Stacked Block Copolymer Lamellar Crystals in Solution

brahim-polymers.jpgBrahim Bessif, Thomas Pfohl and Günter Reiter. Polymers 13 (2021) 1676

We examined the formation of self-seeded platelet-like crystals from polystyrene-block-polyethylene oxide (PS-b-PEO) diblock copolymers in toluene as a function of polymer concentration (c), crystallization temperature (TC), and self-seeding temperature (TSS). We showed that the number (N) of platelet-like crystals and their mean lateral size (L) can be controlled through a self-seeding procedure.  [more...]

 

List of Publications

Circular Fluorescence Polarization of Achiral Molecules in Cholesteric Liquid Crystals
H. Stegemeyer, W. Stille and P. Pollmann. Israel J. Chem. 18, 312 (1979)
Molekulare Deutung der Umwandlungswärmen bei den Modifikationsübergängen des n-Tritriacontans
G.R. Strobl. Coll. Polym. Sci. 256, 427-445 (1978)
Raman Spectroscopic Method for Determining Crystallinity of Polyethylene
G.R. Strobl, W. Hagedorn. J. Polym. Sci. Part B - Polymer Physics 16, 1181-1193 (1978)
Molecular-Motion, Thermal-Expansion, and the Phase-Transitions in Paraffins: A Model for Polymers
G.R. Strobl. J. Polym. Sci. Part C - Polymer Symposium 59, 121-142 (1977)
Die molekularen Grundlagen der anisotropen thermischen Ausdehnung von Paraffinen und Polyäthylen. Eine ramanspektroskopische Untersuchung am Beispiel des N-Tritriacontans
G.R. Strobl. Coll. Polym. Sci. 254, 170-189 (1976)
Packing of Paraffin Chains in 4 Stable Modifications of n-Tritriacontane
W. Piesczek, G.R. Strobl, K. Malzahn. Acta Cryst. B 30, 1278 (1974)
Defect Structure and Molecular-Motion in 4 Modifications of Normal-Tritriacontane. 2. Study of Molecular-Motion Using Infrared Spectroscopy and Wide-Line Nuclear Magnetic-Resonance Measurements
B. Ewen, E.W. Fischer, W. Pieszek, G. Strobl. J. Chem. Phys. 61, 5265-5272 (1974)
Defect Structure and Molecular-Motion in 4 Modifications of Normal-Tritriacontane. 1. Study of Defect Structure in Lamellar Interfaces Using Small-Angle X-Ray-Scattering
G. Strobl, B. Ewen, E.W. Fischer, W. Piesczek. J. Chem. Phys. 61, 5257-5264 (1974)
An exactly solvable model for coherent and incoherent exciton motion
H. Haken and G. Strobl. Zeitschrift für Physik 262, 135-148 (1973)
Small-angle x-ray scattering experiments for investigating the validity of the two-phase model
G.R. Strobl, N. Müller. Journal of Polymer Science B - Polymer Physics 11, 1219-1233 (1973)
Determination of Lamellar Structure of Partially Crystalline Polymers by Direct Analysis of their Small-Angle X-Ray-Scattering Curves
G.R. Strobl. Journal of Applied Crystallography 6, 365-370 (1973)
Synthese und Eigenschaften molekulareinheitlicher n-Paraffine bis zum C140H282
W. Heitz, E.W. Fischer, R. Peters, T. Wirth, G. Strobl. Makromolekulare Chemie 162, 63 (1972)
Analyse von spaltverschmierten Kleinwinkelstreukurven lamellarer Strukturen
G.R. Strobl. Kolloid-Zeitschrift and Zeitschrift für Polymere 250, 1039-1046 (1972)
A New Method for Evaluating Slit-Smeared Small Angle X-Ray Scattering Data
G.R. Strobl. Acta Crystallographica A 26, 367-375 (1970)
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