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Fakultätsübergreifendes Institut für Werkstofftechnik

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Univ.-Prof. Dr. Edda Rädlein


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Herz, Andreas; Friák, Martin; Roßberg, Diana; Hentschel, Martin; Theska, Felix; Wang, Dong; Holec, David; Šob, Mojmir; Schneeweiss, Oldřich; Schaaf, Peter
Facet-controlled phase separation in supersaturated Au-Ni nanoparticles upon shape equilibration. - In: Applied physics letters. - Melville, NY : American Inst. of Physics, ISSN 10773118, Bd. 107 (2015), 7, S. 073109, insges. 5 S.

Solid-state dewetting is used to fabricate supersaturated, submicron-sized Au-Ni solid solution particles out of thin Au/Ni bilayers by means of a rapid thermal annealing technique. Phase separation in such particles is studied with respect to their equilibrium crystal (or Wulff) shape by subsequent annealing at elevated temperature. It is found that {100} faceting planes of the equilibrated particles are enriched with Ni and {111} faces with Au. Both phases are considered by quantum-mechanical calculations in combination with an error-reduction scheme that was developed to compensate for a missing exchange-correlation potential that would reliably describe both Au and Ni. The observed phase configuration is then related to the minimization of strongly anisotropic elastic energies of Au- and Ni-rich phases and results in a rather unique nanoparticle composite state that is characterized by nearly uniform value of elastic response to epitaxial strains all over the faceted surface. The same conclusion is yielded also by evaluating bi-axial elastic moduli when employing interpolated experimental elastic constants. This work demonstrates a useful route for studying features of physical metallurgy at the mesoscale.
Caba, Stefan; Koch, Michael
Porenfreie Bauteile : Verringerung des Fehlstellengehalts und Prozessbeschleunigung im RTM-Prozess. - In: Lightweight design : die Fachzeitschrift für den Leichtbau bewegter Massen. - Wiesbaden : Vieweg und Teubner/Springer Fachmedien, ISSN 21928738, Bd. 8 (2015), 4, S. 56-61

Das Resin Transfer Molding Verfahren (RTM) zur Herstellung von Leichtbauteilen aus faserverstärktem Kunststoff wird vermehrt in Serienprozessen eingesetzt. Dabei ist stets ein Kompromiss zwischen kurzer Zykluszeit und hoher Bauteilqualität zu suchen. An der TU Ilmenau wurde die Fehlstellenentstehung während des Injektionsvorgangs genauer analysiert und eine veränderte Injektionsstrategie entwickelt. Die Analyse zeigt, dass bei geeigneten Prozessparametern die Herstellung fehlstellenfreier Bauteile möglich ist. Erzielbare Zykluszeiten erleichtern die Produktion in Großserienprozessen.
Bruchmüller, Matthias; Koch, Michael
Simulierend modifizieren : geometrische Gestaltung von Reibflächen auf Sand. - In: PlastverarbeiterPlastverarbeiter : neue Technologien, Kosteneffizienz, erhöhte Marktchancen. - Heidelberg : Hüthig - Heidelberg : Hüthig, ISSN 00321338, Bd. 66 (2015), 7, S. 54-55
Wang, Ming; Wang, Dong; Kups, Thomas; Schaaf, Peter
Size effect on mechanical behavior of Al/Si3N4 multilayers by nanoindentation. - In: Materials science and engineering / A. - Amsterdam : Elsevier, ISSN 18734936, Bd. 644 (2015), S. 275-283
Ren, Wenzhi; Van, Yong; Zeng, Leyong; Shi, Zhenzhi; Gong, An; Schaaf, Peter; Wang, Dong; Zhao, Jinshun; Zou, Baobo; Yu, Hongsheng
A near infrared light triggered hydrogenated black TiO 2 for cancer photothermal therapy. - In: Advanced healthcare materials. - Weinheim : Wiley-VCH, ISSN 21922659, Bd. 4 (2015), 10, S. 1526-1536

White TiO2 nanoparticles (NPs) have been widely used for cancer photodynamic therapy based on their ultraviolet light-triggered properties. To date, biomedical applications using white TiO2 NPs have been limited, since ultraviolet light is a well-known mutagen and shallow penetration. This work is the first report about hydrogenated black TiO2 (H-TiO2) NPs with near infrared absorption explored as photothermal agent for cancer photothermal therapy to circumvent the obstacle of ultraviolet light excitation. Here, it is shown that photothermal effect of H-TiO2 NPs can be attributed to their dramatically enhanced nonradiative recombination. After polyethylene glycol (PEG) coating, H-TiO2-PEG NPs exhibit high photothermal conversion efficiency of 40.8%, and stable size distribution in serum solution. The toxicity and cancer therapy effect of H-TiO2-PEG NPs are relative systemically evaluated in vitro and in vivo. The findings herein demonstrate that infrared-irradiated H-TiO2-PEG NPs exhibit low toxicity, high efficiency as a photothermal agent for cancer therapy, and are promising for further biomedical applications.
Soulière, Veronique; Alassaad, Kassem; Cauwet, Fran¸cois; Peyre, Herve; Kups, Thomas; Pezoldt, Jörg; Kwasnicki, Pawel; Ferro, Gabriel
Ge addition during 4H-SiC epitaxial growth by CVD: mechanism of incorporation. - In: Materials science forum : MSF. - Uetikon : Trans Tech Publ, ISSN 16629752, Bd. 821/823 (2015), S. 115-120
Szabó, Ondrej; Kováčová, S.; Tvarožek, Vladimir; Novotný, Ivan; Šutta, Pavol; Netrvalová, Marie; Roßberg, Diana; Schaaf, Peter
Nanocolumnar growth of sputtered ZnO thin films. - In: Thin solid films : international journal on the science and technology of condensed matter films. - Amsterdam [u.a.] : Elsevier, Bd. 591Bd. 591.2015, Part B, S. 230-236
Wulfmeier, Hendrik; Albrecht, Daniel; Fischer, Julian; Ivanov, Svetlozar; Bund, Andreas; Ulrich, Sven; Fritze, Holger
Thin-film calorimetry: analytical tool for in-situ characterization of lithium ion batteries. - In: Journal of the Electrochemical Society : JES. - Pennington, NJ : Electrochemical Soc, ISSN 19457111, Bd. 162Bd. 162 (2015), 4, Seite A727-A736
Lalau, Cornel-Constantin; Bund, Andreas; Ispas, Adriana; Weier, Tom
Sodium-bismuth-lead low temperature liquid metal battery. - In: Journal for electrochemistry and plating technology : J.E.P.T. - Bad Saulgau : Leuze, ISSN 21960267, (2015), insges. 6 S.
Aristizabal, Ekine; Günter, Friedhelm; Hopfeld, Marcus; Schaaf, Peter
Improved description of the flow characteristics of copper for the finite element simulation of the cold joining process for high current electrical contacts. - In: Advanced engineering materials. - Weinheim : Wiley-VCH Verl, ISSN 15272648, Bd. 17 (2015), 4, S. 467-473