TY - JOUR A1 - Hartelt, Manfred A1 - Wäsche, Rolf A1 - Djahanbakhsh, Mohammad A1 - Österle, Werner T1 - Vergleich von Standard-Modell- und HIP-Simulator-Untersuchungen an Verschleißschutzschichten für Metall-Keramik-Paarungen bei Endoprothesen JF - Tribologie und Schmierungstechnik KW - Beschichtung KW - Reversierender Gleitverschleiß KW - HIP-Simulation KW - Coating KW - Reciprocating sliding KW - HIP-Simulation PY - 2008 SN - 0724-3472 VL - 55 IS - 1 SP - 21 EP - 25 PB - Expert Verlag CY - Renningen AN - OPUS4-17133 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Österle, Werner A1 - Bettge, Dirk T1 - Vergleich von Methoden zur Charakterisierung von Bremsbelag-Oberflächen / A Comparison of Methods for Characterizing Brake Lining Surfaces JF - Praktische Metallographie = Practical metallography PY - 2004 SN - 0032-678X N1 - Sprachen: Deutsch/Englisch - Languages: German/English VL - 41 IS - 10 SP - 494 EP - 505 PB - Hanser CY - München AN - OPUS4-7644 LA - mul AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Österle, Werner T1 - Untersuchungen zum Fließverhalten eines durch Versetzungen und Ausscheidungsteilchen verfestigten Stahls JF - Material und Technik PY - 1984 SN - 0376-6845 VL - 12 IS - 3 SP - 91 EP - 97 PB - Schweizerischer Verband für die Materialprüfungen der Technik CY - Dübendorf AN - OPUS4-2394 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Kharrazi, Y.H.K. A1 - Österle, Werner T1 - Untersuchung der Mikrostruktur asbesthaltiger Bremsbeläge und Möglichkeiten der Asbestsubstitution JF - Praktische Metallographie = Practical metallography PY - 2002 SN - 0032-678X N1 - Sprachen: Deutsch/Englisch - Languages: German/English VL - 39 IS - 10 SP - 542 EP - 556 PB - Hanser CY - München AN - OPUS4-2372 LA - mul AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Natte, Kishore A1 - Österle, Werner A1 - Friedrich, Jörg Florian A1 - von Klitzing, R. A1 - Orts-Gil, Guillermo T1 - Tuning interfacial properties and colloidal behavior of hybrid nanoparticles by controlling the polymer precursor JF - Macromolecular Chemistry and Physics N2 - A facile and versatile synthetic route for controlling the size and surface potential of organic–inorganic hybrid silica nanoparticles (NPs) is introduced in this paper. For polymer-grafted NPs, the density of polymer chains on the surface is strongly affected by the concentration of precursor. Nevertheless, for condensed NPs, the precursor concentration determines the particle size but not the density of polymer chains on the surface or the adsorption of bovine serum albumin (BSA). Results presented here may have Major implications in biomedical and colloidal chemistry since interfacial and colloidal properties are known to drive several processes associated with nanoparticles in biological media. KW - BSA KW - Bio-interface KW - Nanosilica hybrids KW - PEG KW - Protein corona PY - 2012 DO - https://doi.org/10.1002/macp.201200148 SN - 0025-116X SN - 1022-1352 SN - 1521-3935 VL - 213 IS - 22 SP - 2412 EP - 2419 PB - Whiley-VCH CY - Weinheim AN - OPUS4-38549 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Österle, Werner A1 - Deutsch, Cornelius A1 - Gradt, Thomas A1 - Orts Gil, Guillermo A1 - Schneider, Thomas A1 - Dmitriev, A.I. T1 - Tribological screening tests for the selection of raw materials for automotive brake pad formulations JF - Tribology International N2 - A modified pin-on-disc test was applied to determine tribological properties of typical brake pad constituents. Ball-milling of these ingredients together with iron oxide and graphite provided model materials displaying the main features of real third bodies. Solid lubricants like graphite affected the friction and wear behaviour of Fe3O4 powders considerably whereas further addition of hard nanoparticles induced only minor effects. This was corroborated by comparison with modelling results. MoS2 played a dual role. Depending on special conditions, this ingredient either reduced or increased friction. The latter could be explained, after nanoscopic characterization, by oxidation and destruction of the wear-protecting tribofilm. KW - Brake pad formulation KW - Raw materials KW - Third body KW - Pin-on-disc test PY - 2014 DO - https://doi.org/10.1016/j.triboint.2014.01.017 SN - 0301-679X VL - 73 SP - 148 EP - 155 PB - Butterworth-Heinemann CY - Oxford AN - OPUS4-30221 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Zhao, F. A1 - Li, G. A1 - Österle, Werner A1 - Häusler, Ines A1 - Zhang, G. A1 - Wang, T. A1 - Wang, Q. T1 - Tribological investigations of glass fiber reinforced epoxy composites under oil lubrication conditions JF - Tribology International N2 - The tribological performance of short glass fibers (SGF),solid lubricants and silica nanoparticles filled epoxy (EP) composites was investigated under oil lubrication conditions. It is demonstrated that the addition of SGF greatly reduces the friction and wear of EP. However, further addition of solid lubricants and silica nanoparticles does not change obviously the friction and wear. It is identified that the high tribological performance of SGF reinforced EP is related to the high load carrying capacity and abrasion resistance of SGF. The nanostructure of the tribofilm was comprehensively characterized. It is deemed that the tribofilm plays an important role in the tribological performance by avoiding the direct rubbing of the sliding pairs exposed to boundary and mixed lubrication conditions. KW - Reinforced epoxy composites KW - Short glass fiber KW - Oil lubrication KW - Tribofilm PY - 2016 DO - https://doi.org/10.1016/j.triboint.2016.07.002 SN - 0301-679X VL - 103 SP - 208 EP - 217 PB - Elsevier Ltd. AN - OPUS4-38145 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Ressel, P. A1 - Österle, Werner A1 - Urban, Ingrid A1 - Dörfel, Ilona A1 - Klein, A. A1 - Vogel, K. A1 - Kräutle, H. T1 - Transmission electron microscopy study of rapid thermally annealed Pd/Ge contacts on IN0.53Ga0.47As JF - Journal of applied physics PY - 1996 SN - 0021-8979 SN - 1089-7550 VL - 88 SP - 3910 EP - 3914 PB - American Institute of Physics CY - Melville, NY AN - OPUS4-2514 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Ressel, P. A1 - Österle, Werner A1 - Urban, Ingrid A1 - Klein, A. A1 - Vogel, K. A1 - Kräutle, H. T1 - Transmission electron microscopy study of rapid thermally annealed Pd/Ge contacts on In0.53Ga0.47As JF - Journal of Applied Physics N2 - Phase formation in rapid thermally annealed Pd/Ge contacts on In0.53Ga0.47As has been investigated by means of cross-sectional transmission electron microscopy, convergent-beam electron diffraction, and energy-dispersive x-ray analysis. Solid-phase regrowth is observed to occur similarly as in Pd/Ge contacts on GaAs or InP. The reaction starts at low temperatures with the formation of an amorphous Pd–In–Ga–As layer, which crystallizes at elevated temperatures yielding hexagonal Pd4In0.53Ga0.47As being first described in this work. At temperatures .250 °C, this phase decomposes due to epitaxial solid-phase regrowth of In0.53Ga0.47As and formation of Pd–Ge phases. The stable composition is reached at temperatures .350 °C with excess Ge diffused through top Pd–Ge to the contact interface and growing epitaxially on the semiconductor. KW - Semiconductor KW - Thin film contact layer KW - Electron microscopy KW - Intermetallic phases PY - 1996 DO - https://doi.org/10.1063/1.363348 SN - 0021-8979 VL - 80 IS - 7 SP - 3910 EP - 3914 AN - OPUS4-38537 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Drescher, Daniela A1 - Orts Gil, Guillermo A1 - Laube, G. A1 - Natte, Kishore A1 - Veh, R.W. A1 - Österle, Werner A1 - Kneipp, Janina T1 - Toxicity of amorphous silica nanoparticles on eukaryotic cell model is determined by particle agglomeration and serum protein adsorption effects JF - Analytical and bioanalytical chemistry N2 - Cell cultures form the basis of most biological assays conducted to assess the cytotoxicity of nanomaterials. Since the molecular environment of nanoparticles exerts influence on their physicochemical properties, it can have an impact on nanotoxicity. Here, toxicity of silica nanoparticles upon delivery by fluid-phase uptake is studied in a 3T3 fibroblast cell line. Based on XTT viability assay, cytotoxicity is shown to be a function of (1) particle concentration and (2) of fetal calf serum (FCS) content in the cell culture medium. Application of dynamic light scattering shows that both parameters affect particle agglomeration. The DLS Experiments verify the stability of the nanoparticles in culture medium without FCS over a wide range of particle concentrations. The related toxicity can be mainly accounted for by single silica nanoparticles and small agglomerates. In contrast, agglomeration of silica nanoparticles in all FCS-containing media is observed, resulting in a decrease of the associated toxicity. This result has implications for the evaluation of the cytotoxic potential of silica nanoparticles and possibly also other nanomaterials in standard cell culture. KW - Agglomeration KW - Cytotoxicity KW - Fibroblast cells KW - Serum proteins KW - Silica nanoparticles PY - 2011 DO - https://doi.org/10.1007/s00216-011-4893-7 SN - 1618-2642 SN - 1618-2650 VL - 400 IS - 5 SP - 1367 EP - 1373 PB - Springer CY - Berlin AN - OPUS4-23678 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -