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您的检索式：作者名="Sebastian Riedel"
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| 1 | Hard and tough novel high-pressure γ-Si_(3)N_(4)/Hf_(3)N_(4) ceramic nanocomposites显示文摘Cubic silicon nitride(-Si_(3)N_(4))is superhard and one of the hardest materials after diamond and cubic boron nitride(cBN),but has higher thermal stability in an oxidizing environment than diamond,making it a competitive candidate for technological applications in harsh conditions(e.g.,drill head and abrasives).Here,we report the high-pressure synthesis and characterization of the structural and mechanical properties of a γ-Si_(3)N_(4)/Hf_(3)N_(4) ceramic nanocomposite derived from single-phase amorphous silicon(Si)-hafnium(Hf)-nitrogen(N)precursor.The synthesis of the-Si_(3)N_(4)/Hf_(3)N_(4) nanocomposite is performed at~20 GPa and ca.1500 ℃ in a large volume multi anvil press.The structural evolution of the amorphous precursor and its crystallization to-Si_(3)N_(4)/Hf_(3)N_(4) nanocomposites under high pressures is assessed by the in situ synchrotron energy-dispersive X-ray diffraction(ED-XRD)measurements at~19.5 GPa in the temperature range of ca.1000-1900℃.The fracture toughness(K_(IC))of the two-phase nanocomposite amounts~6/6.9 MPa·m^(1/2) and is about 2 times that of single-phaseγ-Si_(3)N_(4),while its hardness of ca.30 GPa remains high.This work provides a reliable and feasible route for the synthesis of advanced hard and tough-Si_(3)N_(4)-based nanocomposites with excellent thermal stabililty. | Wei Li Zhaoju Yu Leonore Wiehl Tianshu Jiang Ying Zhan Emmanuel III Ricohermoso Martin Etter Emanuel Ionescu Qingbo Wen Christian Lathe Robert Farla Dharma Teppala Teja Sebastian Bruns Marc Widenmeyer Anke Weidenkaff Leopoldo Molina-Luna Ralf Riedel Shrikant Bhat | 2023 | Journal of Advanced Ceramics2023，12，7： | 0 |
| 2 | Effects of perfluoroalkyl and polyfluoroalkyl substances(PFAS)on soil structure and function显示文摘Soils are impacted globally by several anthropogenic factors,including chemical pollutants.Among those,perfluoroalkyl and polyfluoroalkyl substances(PFAS)are of concern due to their high environmental persistence,and as they might affect soil structure and function.However,data on impacts of PFAS on soil structure and microbially-driven processes are currently lacking.This study explored the effects of perfluorooctanesulfonic acid(PFOS),perfluorooctanoic acid(PFOA)and perfluorobutanesulfonic acid(PFBS)at environmental-relevant concentrations on soil health,using a 6-week microcosm experiment.PFAS(even at 0.5 ng g-1 for PFBS)significantly increased litter decomposition,associated with positive effects on-glucosidase activities.This effect increased with PFAS concentrations.Soil pH was significantly increased,likely as a direct consequence of increased litter decomposition affected by PFAS.Soil respiration was significantly inhibited by PFAS in week 3,while this effect was more variable in week 6.Water-stable aggregates were negatively affected by PFOS,possibly related to microbial shifts.PFAS affected soil bacterial and fungal abundance,but not microbial and certain enzyme activities.Our work highlights the potential effects of PFAS on soil health,and we argue that this substance class could be a factor of environmental change of potentially broad relevance in terrestrial ecosystem functioning. | Baile Xu Gaowen Yang Anika Lehmann Sebastian Riedel Matthias C.Rillig | 2023 | Soil Ecology Letters2023，5，1： | 0 |
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