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Univ.-Prof. Dr. Edda Rädlein


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im Institut für Werkstofftechnik

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Halbedel, Bernd ; Kazan, Oleg
Development of an electromechanical principle for wet and dry milling. - In: IOP conference series / Materials science and engineering. - London [u.a.] : Institute of Physics, ISSN 1757899X, Bd. 355 (2018), S. 012021, insges. 7 S.

The paper presents a novel electromechanical principle for wet and dry milling of different materials, in which the milling beads are moved under a time- and local-variable magnetic field. A possibility to optimize the milling process in such a milling machine by simulation of the vector gradient distribution of the electromagnetic field in the process room is presented. The mathematical model and simulation methods based on standard software packages are worked out. The results of numerical simulations and experimental measurements of the electromagnetic field in the working chamber of a developed and manufactured laboratory plant correlate well with each other. Using the obtained operating parameters, dry milling experiments with crushed cement clinker and wet milling experiments of organic agents in the laboratory plant are performed and the results are discussed here.
Leimbach, Martin ; Tschaar, Christoph; Schmidt, Udo; Bund, Andreas
Electrochemical characterization of chromium deposition from trivalent solutions for decorative applications by EQCM and near-surface pH measurements. - In: Electrochimica acta : the journal of the International Society of Electrochemistry (ISE). - New York, NY [u.a.] : Elsevier, Bd. 270 (2018), S. 104-109
Gerullis, Sven ; Pohle, Lisa; Pfuch, Andreas; Beier, Oliver; Kretzschmar, Björn S. M.; Raugust, Marc; Rädlein, Edda; Grünler, Bernd; Schimanski, Arnd
Structural, electrical and optical properties of SnOx films deposited by use of atmospheric pressure plasma jet. - In: Thin solid films : international journal on the science and technology of condensed matter films. - Amsterdam [u.a.] : Elsevier, Bd. 649 (2018), S. 97-105
Im Titel ist "x" tiefgestellt
El Shabrawy, Samha ; Miglierini, Marcel; Schaaf, Peter; Tzankov, Dimitar; Georgieva, Milena; Harizanova, Ruzha; Rüssel, Christian
Mössbauer spectroscopy of ZnxMg1-x Fe2O4 (0 ≤ x ≤ 0.74) nanostructures crystallized from borate glasses. - In: Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology. - Dordrecht [u.a.] : Springer Science + Business Media B.V, ISSN 1572896X, Bd. 20 (2018), 3, Article 81, insges. 12 S.
Im Titel sind "x", "1-x", "2" und "4" tiefgestellt
Wang, Ming ; Wang, Dong; Schaaf, Peter
Layer thickness effect on fracture behavior of Al/Si3N4 multilayer on Si substrate under three-point bending. - In: Applied surface science : a journal devoted to applied physics and chemistry of surfaces and interfaces. - Amsterdam : Elsevier, Bd. 445 (2018), S. 563-567
Im Titel sind "2" und "3" tiefgestellt

The fracture behavior of multilayers in the nanometer thickness range has attracted an increased attention due to microelectronics and high-speed technologies. In this work, Al/Si3N4 multilayers fabricated by magnetron sputtering on the silicon substrate were subjected to three-point bend testing. It was investigated that the fracture behavior of Al/Si3N4 multilayers with different individual layer thickness (50, 100, 250 nm) but with the same total thickness (1.0 [my]m). There is a significant layer thickness effect on the fracture behavior of the whole multilayer-substrate system: when the individual layer thickness is large (250 nm), the failure of the whole system was dominated by the fracture of the substrate, while the failure of the whole system was dominated by the fracture of the multilayer with smaller individual layer thickness (50 nm). This effect is clearly obvious, although the total thickness of the multilayer is very small compared with that of the substrate. As the individual layer thickness decreased from 250 nm to 50 nm, the fracture strain on the Al/Si3N4 multilayer decreased from 0.073% to 0.026%.
Halm, Cynthia ; Otto, Andreas; Stark, Tilman; Schaaf, Peter
Enhancing the retention force of press-fit connections by ultrasonic excitation. - In: Physica status solidi / A. - Weinheim : Wiley-VCH, ISSN 1521396X, Bd. 215 (2018), 6, S. 1700598, insges. 8 S.
Schoetz, Theresa ; Ponce de Leon, Carlos; Bund, Andreas; Ueda, Mikito
Electro-polymerisation of 3,4-ethylenedioxythiophene on reticulated vitreous carbon in imidazolium-based chloroaluminate ionic liquid as energy storage material. - In: Electrochemistry communications. - Amsterdam [u.a.] : Elsevier Science, ISSN 13882481
Herz, Andreas ; Theska, Felix; Roßberg, Diana; Kups, Thomas; Wang, Dong; Schaaf, Peter
Solid-state dewetting of Au-Ni bi-layer films mediated through individual layer thickness and stacking sequence. - In: Applied surface science : a journal devoted to applied physics and chemistry of surfaces and interfaces. - Amsterdam : Elsevier, Bd. 444 (2018), S. 505-510

In the present work, the solid-state dewetting of Au-Ni bi-layer thin films deposited on SiO2/Si is systematically studied with respect to individual layer thickness and stacking sequence. For this purpose, a rapid heat treatment at medium temperatures is applied in order to examine void formation at the early stages of the dewetting. Compositional variations are realized by changing the thickness ratio of the bi-layer films, while the total thickness is maintained at 20 nm throughout the study. In the event of Au/Ni films annealed at 500 ˚C, crystal voids exposing the substrate are missing regardless of chemical composition. In reverse order, the number of voids per unit area in two-phase Au-Ni thin films is found to be governed by the amount of Au-rich material. At higher temperatures up to 650 ˚C, a decreased probability of nucleation comes at the expense of a major portion of cavities, resulting in the formation of bubbles in 15 nm Ni/5 nm Au bi-layers. Film buckling predominantly occurred at phase boundaries crossing the bubbles.
Zheng, Si-Xue ; Luo, Xue-Mei; Wang, Dong; Zhang, Guang-Ping
A novel evaluation strategy for fatigue reliability of flexible nanoscale films. - In: Materials Research Express : MRX. - Bristol : IOP Publ, ISSN 20531591, Bd. 5 (2018), 3, S. 035012, insges. 8 S.
Wang, Dong ; Schaaf, Peter
Plasmonic nanosponges. - In: Advances in Physics: X : APX. - Abingdon : Taylor & Francis Group, ISSN 23746149, Bd. 3 (2018), 1, Article: 1456361, insges. 19 S.

Gold nanosponges, or nanoporous gold nanoparticles, possess a percolated nanoporous structure over the entire nanoparticles. The optical and plasmonic properties of gold nanosponges and its related hybrid nanosponges are very fascinating due to the unique structural feature, and are controllable and tuneable in a large scope by changing the structural parameters like pore/ligament size, porosity, particle size, particles form, and hybrid structure. The nanosponges show the strong polarization dependence and multiple resonances behavior. Besides, the nanosponges exhibit a significantly higher local field enhancement than the solid nanoparticles. Strong nonlinear optical properties are confirmed by their high-order photoemission behavior, whereby long-lived plasmon modes are also clearly observed. All this is very important and relevant for the applications in enhanced Raman scattering, fluorescence manipulation, sensing, and nonlinear photonics.