6 Materialchemie
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- 2020 (284) (entfernen)
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- X-ray spectroscopy (1)
- X-rays (1)
- XAS (1)
- Xrays (1)
- Yttrium silicates (1)
- ZIF-8 (1)
- Zentrifugentechnologie (1)
- Zinc oxide (1)
- Zinc phosphate (1)
- Zwitterion (1)
- electrocatalysis (1)
- nPSize (1)
- nanostructured (1)
- µ-CT (1)
Organisationseinheit der BAM
- 6 Materialchemie (284)
- 6.3 Strukturanalytik (84)
- 6.1 Oberflächen- und Dünnschichtanalyse (81)
- 6.6 Physik und chemische Analytik der Polymere (50)
- 6.2 Material- und Oberflächentechnologien (39)
- 6.5 Synthese und Streuverfahren nanostrukturierter Materialien (30)
- 1 Analytische Chemie; Referenzmaterialien (15)
- 6.7 Materialsynthese und Design (14)
- 5 Werkstofftechnik (12)
- 4 Material und Umwelt (9)
Paper des Monats
- ja (3)
Eingeladener Vortrag
- nein (73)
Ultrashort pulse laser processing of materials allows for precise machining with high accuracy. By increasing the repetition rate to several 100 kHz, laser machining becomes quick and cost-effective. Ultrafast laser processing at high repetition rates and peak intensities above 10^13 W/cm^2 can cause a potential hazard by generation of unwanted x-ray radiation. Therefore, radiation protection must be considered. For 925 fs pulse duration at a center wavelength of 1030 nm, the x-ray emission in air at a repetition rate of 400 kHz was investigated up to a
peak intensity of 2.6 × 10^14 W/cm^2. Based on the presented measurements, the properties of potential shielding materials will be discussed. By extending our previous works, a scaling of the x-ray radiation emission to higher peak intensities up to 10^15 W/cm^2 is described, and emitted x-ray doses are predicted.
You Ask – ACEnano Replies
(2020)
The workshop starts with introductory information about the workshop and the H2020 project ACEnano, followed by two expert round tables, focussing on how the project could address regulator and industry needs, respectively. This is be followed by parallel sessions on tools (based on preferences expressed by those registered to attend, see “Questions”) and finally a question-and-answer session with the attendees.
The experts invited in Round Table 1 have been prepared to answer to questions related to obstacles and advantages for stakeholders such as SMEs to use the ACEnano approaches/tools. Standardisation needs are discussed.
Der Vortrag widmet sich der „Zentrifugentechnologie zur statistischen Untersuchung von Stumpfklebungen“ und beschreibt drei wesentlich verschiedene Realsysteme (Fügefläche 1/Klebstoff/ Fügefläche 2), um die Statistik ZPM (wiederholte Ein-Proben-Prüfung) vs. CAT (Mehr-Proben-Prüfung) zu vergleichen. Dazu wurden drei unterschiedliche Klebstoff-klassen mit typischen Fügeteilmaterialkombinationen ausgewählt und in einem Vorversuch mit jeweils 3 unterschiedlichen Prüfgeschwindigkeiten sowohl im Weg-geregelten als auch Kraft-geregelten Mode beansprucht. Die Ergebnisse ZPM vs. CAT und Kraft- vs. Weg-Regelung des Vorversuches zeigten keinerlei Unterschiede auf. Im Ergebnis wurde ein Ringversuch im Kraft-geregelten Mode (6xZPM vs. 8xCAT) für ein Referenzsystem durchgeführt, der nachwies, dass die CAT-Technologie statistisch relevante Prüfergebnisse zur Klebfestigkeit bereitstellt. Es zeigte sich, dass für zwei ZPM-Teilnehmer im Vertrauensbereich 99% statistisch signifikant etwas kleinere Werte der Klebfestigkeit bestimmt wurden, was auf geringfügige Abweichungen von der axialen Ausrichtung des eingespannten Prüflings bei der Ein-Proben-ZPM-Zugprüfung zurückgeführt wird.
This paper reports the formation of zinc phosphate nanoparticles from the artificial digestion of zinc chloride. Initially, the formation of amorphous primary particles with a mean radius of 1.1 nm is observed, alongside the formation of larger, protein stabilized aggregates. These aggregates, with a radius of gyration of 37 nm, are observed after 5 minutes of exposure to artificial saliva and are shown to be colloidally stable for a minimum time of two weeks. The initially formed primary particles are thought to consist of amorphous zinc phosphate, which is then transformed into crystalline Zn3(PO4)2·4H2O over the course of two weeks. Our results demonstrate that the interaction of inorganic salts with bodily fluids can induce the formation of de novo nanoparticles, which in turn, provides insights into how zinc‐enriched foods may also facilitate the formation of nanoparticles upon contact with saliva. As such, this may be considered as an undesirable (bio)mineralization.