TY - JOUR A1 - Hendriks, L. A1 - Brunjes, R. A1 - Taskula, S. A1 - Kocic, J. A1 - Hattendorf, B. A1 - Bland, G. A1 - Lowry, G. A1 - Bolea-Fernandez, E. A1 - Vanhaecke, F. A1 - Wang, J. A1 - Baalousha, M. A1 - von der Au, Marcus A1 - Meermann, Björn A1 - Holbrook, T. A1 - Wagner, S. A1 - Harycki, S. A1 - Gundlach-Graham, A. A1 - von der Kammer, F. T1 - Results of an interlaboratory comparison for characterization of Pt nanoparticles using single-particle ICP-TOFMS N2 - This study describes an interlaboratory comparison (ILC) among nine (9) laboratories to evaluate and validate the standard operation procedure (SOP) for single-particle (sp) ICP-TOFMS developed within the context of the Horizon 2020 project ACEnano. The ILC was based on the characterization of two different Pt nanoparticle (NP) suspensions in terms of particle mass, particle number concentration, and isotopic composition. The two Pt NP suspensions were measured using icpTOF instruments (TOFWERK AG, Switzerland). Two Pt NP samples were characterized and mass equivalent spherical sizes (MESSs) of 40.4 ± 7 nm and 58.8 ± 8 nm were obtained, respectively. MESSs showed <16% relative standard deviation (RSD) among all participating labs and <4% RSD after exclusion of the two outliers. A good agreement was achieved between the different participating laboratories regarding particle mass, but the particle number concentration results were more scattered, with <53% RSD among all laboratories, which is consistent with results from previous ILC studies conducted using ICP-MS instrumentation equipped with a sequential mass spectrometer. Additionally, the capabilities of sp-ICP-TOFMS to determine masses on a particle basis are discussed with respect to the potential for particle density determination. Finally, because quasi-simultaneous multi-isotope and multielement determinations are a strength of ICP-TOFMS instrumentation, the precision and trueness of isotope ratio determinations were assessed. The average of 1000 measured particles yielded a precision of below ±1% for intensity ratios of the most abundant Pt isotopes, i.e. 194Pt and 195Pt, while the accuracy of isotope ratios with the lower abundant isotopes was limited by counting statistics. KW - ILC KW - spICP-MS KW - PtNP KW - Nanopartikel PY - 2023 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-580353 DO - https://doi.org/10.1039/d3nr00435j SN - 2040-3364 VL - 15 IS - 26 SP - 11268 EP - 11279 PB - Royal Society of Chemistry (RSC) AN - OPUS4-58035 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Nickel, C. A1 - Angelstorf, J. A1 - Bienert, Ralf A1 - Burkart, C. A1 - Gabsch, S. A1 - Giebner, S. A1 - Haase, A. A1 - Hellack, B. A1 - Hollert, H. A1 - Hund-Rinke, K. A1 - Jungmann, D. A1 - Kaminski, H. A1 - Luch, A. A1 - Maes, H.M. A1 - Nogowski, A. A1 - Oetken, M. A1 - Schaeffer, A. A1 - Schiwy, A. A1 - Schlich, K. A1 - Stintz, M. A1 - von der Kammer, F. A1 - Kuhlbusch, T.A.J. T1 - Dynamic light-scattering measurement comparability of nanomaterial suspensions N2 - Increased use of nanomaterials in everyday products leads to their environmental release and therefore, the information need on their fate and behaviour. Nanomaterials have to be suspended with high repeatability and comparability for studies on environmental effects. They also have to be well characterised with a focus on the state of agglomeration and particle size distribution. Dynamic light-scattering (DLS) is a common technique used for these measurements. If suspensions are prepared in different laboratories, then concern has risen about the comparability of the measured results, especially when different DLS instruments are used. Therefore, for quality assurance, a round-robin test was conducted to assess the comparability of different DLS instruments and a dispersion protocol in ten independent laboratories. Polystyrene and TiO2 were chosen as test (nano)materials. For the comparability of the DLS instruments, the average sizes of the PSL and a stabilised TiO2 suspension were measured. The measured average hydrodynamic diameter shows an overall good inter-laboratory comparability. For the PSL suspension, an average hydrodynamic diameter of 201 ± 13 nm and for the TiO2 suspension an average diameter of 224 ± 24 nm were detected. For the TiO2 suspension that was prepared at each laboratory following an established suspension preparation protocol, an average hydrodynamic diameter of 211 ± 11 nm was detected. The measured average particle size (mode) increased up to 284 nm with a high standard deviation of 119 nm if the preparation protocol could not established and different procedures or different equipment were employed. This study shows that no significant differences between the employed DLS instrument types were determined. It was also shown that comparable measurements and suspension preparation could be achieved if well-defined suspension preparation protocols and comparable equipment can be used. KW - Comparison measurement KW - Dynamic light scattering KW - Nanomaterial suspension KW - Standard operation procedure KW - Instrumentation PY - 2014 DO - https://doi.org/10.1007/s11051-014-2260-2 SN - 1388-0764 SN - 1572-896X VL - 16 SP - 2260-1 EP - 2260-12 PB - Kluwer CY - Dordrecht AN - OPUS4-30193 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Kammer, S. A1 - Kelling, A. A1 - Baier, H. A1 - Mickler, W. A1 - Dosche, C. A1 - Rurack, Knut A1 - Kapp, A. A1 - Lisdat, F. A1 - Holdt, H.-J. T1 - 2,11-dialkylated 1,12-diazaperylene copper(I) complexes: First supramolecular column assemblies by Pi-Pi stacking between homoleptic tetrahedral metal complexes, exhibiting low-energy MLCT transitions KW - Copper KW - N ligands KW - Pi interactions KW - Self-assembly KW - Immobilization PY - 2009 DO - https://doi.org/10.1002/ejic.200900695 SN - 1434-1948 SN - 1099-0682 VL - 2009 IS - 31 SP - 4648 EP - 4659 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-20286 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -