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Fakultätsübergreifendes Institut für Werkstofftechnik


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Publikationen

im Institut für Werkstofftechnik

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Schneidmadel, Stefan; Koch, Michael; Qin, Xiang
Molecular orientation and residual stresses impact on optical properties of plastic lenses. - In: 32nd Polymer Processing Society Annual Meeting 2016 (PPS-32) / Polymer Processing Society Annual Meeting ; 32 (Lyon) : 2016.07.25-29. - Red Hook, NY : Curran Associates, Inc., (2017), S. 983-987

The substitution of conventional materials such as glass for optical plastics offers a high potential for the realization of complex optical systems. Large-scale production processes in combination with high-grade optical parts can be realized by using an injection molding process. The processing of these plastics parts influences the optical properties due to the fact that physical effects occur during filling and cooling of the melt. In general, the optical properties can be differentiated in inner properties (refractive index, transmittance) and outer properties (surface, dimensional accuracy). Both influence and change the light path through the optical material. This work aims to analyze the processing of plastic lenses by tracing back the processing parameters to the occurring physical effects. In comparison to experiments and simulations, the difference between calculated and analyzed optical properties is presented in detail. For this purpose, lens-shaped test specimen were processed on an injection molding machine with different processing parameters. In the simulation program MOLDEX 3D, birefringence patterns, warpage and shrinkage were analyzed and compared to the experimental data applying polariscope for residual stresses and an integrating sphere for transmittance grade. Transmittance values of the lenses between 88 and 89, 1% were accomplished for a polycarbonate lense. By taking into account the correlation between processing parameters and optical properties, a forecast of birefringence and transmittance of plastic parts is possible.


Rudloff, Johannes; Lang, Marieluise; Kretschmer, Karsten; Heidemeyer, Peter; Bastian, Martin; Koch, Michael
Analysis of pellet diameter and inorganic filler influences on the polymer melting behavior in planetary roller extruders. - In: 32nd Polymer Processing Society Annual Meeting 2016 (PPS-32) / Polymer Processing Society Annual Meeting ; 32 (Lyon) : 2016.07.25-29. - Red Hook, NY : Curran Associates, Inc., (2017), S. 666-670
Düngen, Matthias; Keller, S.; Koch, Michael
Modeling approach for the degradat ion mechanisms of PLA resulting from processing. - In: 32nd Polymer Processing Society Annual Meeting 2016 (PPS-32) / Polymer Processing Society Annual Meeting ; 32 (Lyon) : 2016.07.25-29. - Red Hook, NY : Curran Associates, Inc., (2017), S. 471-475
Düngen, Matthias; Müller, M.; Koch, Michael
Groove geometry and bulk material properties impacting on pressure build-up in single screw extruders. - In: 32nd Polymer Processing Society Annual Meeting 2016 (PPS-32) / Polymer Processing Society Annual Meeting ; 32 (Lyon) : 2016.07.25-29. - Red Hook, NY : Curran Associates, Inc., (2017), S. 265-269
Große-Knetter, Jörn; Schaaf, Peter
Das physikalische Praktikum : Handbuch 2017/2018 für Studentinnen und Studenten der Physik. - (Universitätsdrucke)
Schötz, Theresa; Ueda, Mikito; Bund, Andreas; Ponce de Leon, Carlos
Preparation and characterization of a rechargeable battery based on poly-(3,4-ethylenedioxythiophene) and aluminum in ionic liquids. - In: Journal of solid state electrochemistry : current research and development in science and technology. - Berlin : Springer, ISSN 14330768, Bd. 21 (2017), 11, S. 3237-3246
https://doi.org/10.1007/s10008-017-3658-4
Schell, Juliana; Schaaf, Peter; Lupascu, Doru C.
Perturbed angular correlations at ISOLDE: a 40 years young technique. - In: AIP Advances. - New York, NY : American Inst. of Physics, ISSN 21583226, Bd. 7 (2017), 10, S. 105017, insges. 8 S.
https://doi.org/10.1063/1.4994249
Steinhauer, Miriam; Stich, Michael; Kurniawan, Mario; Seidlhofer, Beatrix-Kamelia; Trapp, Marcus; Bund, Andreas; Wagner, Norbert; Friedrich, K. Andreas
In situ studies of solid electrolyte interphase (SEI) formation on crystalline carbon surfaces by neutron reflectometry and atomic force microscopy. - In: ACS applied materials & interfaces. - Washington, DC : Soc, ISSN 19448252, Bd. 9 (2017), 41, S. 35794-35801
https://doi.org/10.1021/acsami.7b09181
Hergert, Germann; Vogelsang, Jan; Schwarz, Felix; Wang, Dong; Kollmann, Heiko; Groß, Petra; Lienau, Christoph; Runge, Erich; Schaaf, Peter
Long-lived electron emission reveals localized plasmon modes in disordered nanosponge antennas. - In: Light : Science & Applications. - London : Nature Publishing Group, ISSN 20477538, Bd. 6Bd. 6 (2017), (20. Okt.), e17075, insges. 8 S.

We report long-lived, highly spatially localized plasmon states on the surface of nanoporous gold nanoparticles-nanosponges-with high excitation efficiency. It is well known that disorder on the nanometer scale, particularly in two-dimensional systems, can lead to plasmon localization and large field enhancements, which can, in turn, be used to enhance nonlinear optical effects and to study and exploit quantum optical processes. Here, we introduce promising, three-dimensional model systems for light capture and plasmon localization as gold nanosponges that are formed by the dewetting of gold/ silver bilayers and dealloying. We study light-induced electron emission from single nanosponges, a nonlinear process with exponents of n approximate to 5...7, using ultrashort laser pulse excitation to achieve femtosecond time resolution. The long-lived electron emission process proves, in combination with optical extinction measurements and finite-difference time-domain calculations, the existence of localized modes with lifetimes of more than 20 fs. These electrons couple efficiently to the dipole antenna mode of each individual nanosponge, which in turn couples to the far-field. Thus, individual gold nanosponges are cheap and robust disordered nanoantennas with strong local resonances, and an ensemble of nanosponges constitutes a meta material with a strong polarization independent, nonlinear response over a wide frequency range.


https://doi.org/10.1038/lsa.2017.75
Wojciechowski, Jarosław; Kolanowski, Łukasz; Bund, Andreas; Lota, Grzegorz
The influence of current collector corrosion on the performance of electrochemical capacitors. - In: Journal of power sources : the international journal on the science and technology of electrochemical energy systems. - New York, NY [u.a.] : Elsevier, ISSN 18732755, Bd. 368 (2017), S. 18-29
https://doi.org/10.1016/j.jpowsour.2017.09.069