TY - JOUR A1 - Kulla, Hannes A1 - Fischer, Franziska A1 - Benemann, Sigrid A1 - Rademann, K. A1 - Emmerling, Franziska T1 - The effect of the ball to reactant ratio on mechanochemical reaction times studied by in situ PXRD N2 - The effect of the reactant powder mass on reaction times for the mechanochemical formation of a soft matter model system was studied by in situ PXRD. The syntheses were performed at a constant ball mass in a shaker mill with and without glassy SiO2 as an inert additive. Reaction times decreased with the increase of the ball to reactant ratio (BRR). The kinetic influence of the SiO2 powder was excluded. The decrease in the reaction time with decreasing mass of reactants was related to the rise in the stress energy transferred to the powder by a higher ball impact. The BRR had no effect on the induction time. But the product conversion was accelerated by raising the BRR. While a certain temperature is needed for the activation of reactants in the induction phase, the conversion of soft matter reactants is rather controlled by impact than temperature. KW - XRD KW - Mechanochemistry PY - 2017 UR - http://pubs.rsc.org/en/content/articlehtml/2017/ce/c7ce00502d DO - https://doi.org/10.1039/c7ce00502d VL - 19 IS - 28 SP - 3902 EP - 3907 AN - OPUS4-41197 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Müeller, W.-D. A1 - Gross, U. A1 - Fritz, Th. A1 - Voigt, Ch. A1 - Fischer, P. A1 - Berger, Georg A1 - Rogaschewski, S. A1 - Lange, K.-P. T1 - Evaluation of the interface between bone and titanium surfaces being blasted by aluminium oxide or bioceramic particles N2 - The surface structure, in particular the surface roughness, and the surface chemistry of titanium implants influence their anchoring in bone. The aim of this study was to analyse metal-bone contact (MBC) after modification of the implant surface, using different materials for blasting. The surface modification of titanium was produced by blasting it with particles made of Al2O3 or bioceramics. The biological effects were then investigated experimentally using 27 rabbits, analysed after 7, 28 and 84 days after the implantation of titanium cylinders treated accordingly. The MBC showed a tendency for more bone after bioceramics were used as a blasting material, compared to Al2O3. KW - Dental implants KW - Surface modification KW - Animal experiment KW - Bioceramics PY - 2003 DO - https://doi.org/10.1034/j.1600-0501.2003.00791.x SN - 0905-7161 SN - 1600-0501 VL - 14 IS - 3 SP - 349 EP - 356 PB - Blackwell Munksgaard CY - Oxford AN - OPUS4-3506 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -