Hohlzylinder: Gallium‐ und Gallium‐Zink‐Pyrogallol[4]aren‐Nanoaggregate wurden mit verschiedenen Methoden in Lösung untersucht. Die Ergebnisse zeigen, dass die Aggregate von der sphärischen Form im Festkörper in eine toroidale Form in Lösung umlagern (siehe PgC4GaZn als Beispiel), was die strukturelle Flexibilität von Gallium in den Metall‐umrandeten Gerüsten illustriert.
Thermodynamische oder kinetische Kontrolle: Kleinwinkel‐Neutronenstreuung und Einkristall‐Röntgenbeugung wurden genutzt, um den Einfluss von Temperatur, Lösungsmittel und Metallsorte auf die Bildung von dimeren oder hexameren metallumsäumten Pyrogallol[4]aren‐Kapseln zu untersuchen. Höhere Temperaturen, Methanol als Lösungsmittel und Nickel als Metall begünstigen die Bildung der Dimere (siehe Schema).
A description and the performance of the very small angle neutron scattering diffractometer at the National Institute of Standards and Technology are presented. The measurement range of the instrument extends over three decades of momentum transfer q from 2 × 10−4 to 0.7 Å−1. The entire scattering angle range from 8 × 10−5 to π/6 rad (30°) can be measured simultaneously using three separate detector carriages on rails holding nine 2D detector arrays. Versatile choices of collimation options and neutron wavelength selection allow the q resolution and beam intensity to be optimized for the needs of the experiment. High q resolution is achieved using multiple converging-beam collimation with circular pinholes combined with refractive lenses and prisms. Relaxed vertical resolution with much higher beam intensity can be achieved with narrow slit collimation and a broad wavelength range chosen by truncating the moderator source distribution below 4 Å with a Be crystalline filter and above 8 Å with a supermirror deflector. Polarized beam measurements with full polarization analysis are also provided by a high-performance supermirror polarizer and spin flipper, capable of producing flipping ratios of over 100, along with a high-efficiency 3He polarization analyzer.
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