TY - CHAP A1 - Arlt, C. A1 - Exner, W. A1 - Riedel, U. A1 - Sturm, Heinz A1 - Sinapius, M. ED - Wiedemann, M. ED - Sinapius, M. T1 - Nanoscaled boehmites' modes of action in a polymer and its carbon fiber reinforced plastic N2 - Laminates of carbon fiber reinforced plastic (CFRP), which are manufactured by injection technology, are reinforced with boehmite particles. This doping strengthens the laminates, whose original properties are weaker than those of prepregs. Besides the shear strength, compression strength and the damage tolerance, the mode of action of the nanoparticles in resin and in CFRP is also analyzed. It thereby reveals that the hydroxyl groups and even more a taurine modification of the boehmites' surface alter the elementary polymer morphology. Consequently a new flow and reaction comportment, lower glass transition temperatures and shrinkage, as well as a changed mechanical behavior occur. Due to a structural upgrading of the matrix (higher shear stiffness, reduced residual stress), a better fiber-matrix adhesion, and differing crack paths, the boehmite nanoparticles move the degradation barrier of the material to higher loadings, thus resulting in considerably upgraded new CFRP. KW - Nano particles KW - Epoxy KW - Aerospace PY - 2012 SN - 978-3-642-29189-0 IS - Chapter 4 SP - 49 EP - 58 PB - Springer CY - Berlin, Heidelberg AN - OPUS4-26496 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Brezina, U. A1 - Kersten, S. A1 - Valenta, H. A1 - Sperfeld, P. A1 - Riedel, Juliane A1 - Dänicke, S. T1 - UV-induced cis-trans isomerization of zearalenone in contaminated maize N2 - In the literature, it has been shown that the naturally occurring trans-zearalenone (ZEN) is transformed by ultraviolet irradiation to cis-ZEN. However, the practical relevance of this transformation in animal feeding remains unclear. The aim of the present preliminary investigation was to examine the effect of UV-irradiation on the concentration of trans-ZEN in a natural feed matrix at different dry matter contents to simulate the dry and wet feeding techniques usually applied in pig feeding. Four variants, air dry or wet ZEN-contaminated ground maize either irradiated or not were tested and analysed with conventional HPLC-FLD for trans-ZEN changes, which were further examined for cis-ZEN formation by HPLC-MS/MS. In conclusion, it could be shown that, under the investigated wet feed conditions, naturally occurring trans-ZEN was partially converted by ultraviolet irradiation to its cis counterpart. In contrast, the cis/trans isomerization seemed not to be relevant in dry maize. The consequence of this finding for practical liquid feeding systems for pigs requires further investigation. Additionally, an improvement of the analytical method for cis-ZEN determination is needed. KW - Cis-/trans-zearalenone KW - Ultraviolet irradiation KW - Maize KW - HPLC PY - 2013 U6 - https://doi.org/10.1007/s12550-013-0178-7 SN - 0178-7888 VL - 29 IS - 4 SP - 221 EP - 227 PB - Springer CY - Berlin; Heidelberg AN - OPUS4-29443 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Hodoroaba, Vasile-Dan A1 - Riedel, J.-U. A1 - Paatsch, Wolfgang T1 - GD-OES as an analytical tool for electroplated components susceptible to hydrogen embrittlement KW - GD-OES KW - GDS KW - Hydrogen KW - Embrittlement PY - 2006 SN - 0161-6951 VL - 31 SP - 354 EP - 356 PB - ICP Information Newsletter, Inc. CY - Amherst, Mass. AN - OPUS4-11935 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -