Dear all, I would like to measure manganese oxide nanoparticles at the Mn K edge. The nanoparticles are affixed to polystyrene latex carrier particles (PS) and the whole composite material (MnO2@PS with ca. 5 m-% MnO2 in the composite) is dispersed in water. Therefore we consider measuring the composite material in the dried state as a powder as well as in the dispersed state in water. The sample preparation for powders to me is quite straight forward, but I would really appreciate if somebody could share his experience with sample preparation and measurements of liquid samples. I think that aqueous samples are best measured in the fluorescence mode. That's why I am concerned of problems like self-absorption and so on. Can anybody tell my what is a good concentration range to overcome effects like self-absorption and how to get good fluorescence data in general? And what kind of sampler holder or materials (cuvettes, etc.) are best suited for aqueous samples? I am looking forward to receiving some helpful replies! Cheers, Frank Dipl. Chem. Frank Polzer F-I2 - Soft Matter and Functional Materials Helmholtzzentrum Berlin für Materialien und Energie Lise-Meitner-Campus Hahn-Meitner-Platz 1 14109 - Berlin Tel.: +49 30 8062-43830 Fax: +49 30 8062-42308 frank.polzer@helmholtz-berlin.demailto:frank.polzer@helmholtz-berlin.de Mitglied der Hermann von Helmholtz-Gemeinschaft Deutscher Forschungszentren e.V Vorsitzender des Aufsichtsrates: Prof. Dr. Dr. h.c. mult. Joachim Treusch, Stellvertretende Vorsitzende: Dr. Beatrix Vierkorn-Rudolph Geschäftsführer: Prof. Dr. Anke Kaysser-Pyzalla, Prof. Dr. Dr. h.c. Wolfgang Eberhardt, Dr. Ulrich Breuer Sitz Berlin, AG Charlottenburg, 89 HRB 5583 ________________________________ Helmholtz-Zentrum Berlin für Materialien und Energie GmbH Mitglied der Hermann von Helmholtz-Gemeinschaft Deutscher Forschungszentren e.V Aufsichtsrat: Vorsitzender Prof. Dr. Dr. h.c. mult. Joachim Treusch, stv. Vorsitzende Dr. Beatrix Vierkorn- Rudolph Geschäftsführer: Prof. Dr. Anke Rita Kaysser-Pyzalla, Prof. Dr. Dr. h.c. Wolfgang Eberhardt, Dr. Ulrich Breuer Sitz Berlin, AG Charlottenburg, 89 HRB 5583 Postadresse: Hahn-Meitner-Platz 1 D-14109 Berlin http://www.helmholtz-berlin.de