Improved small-angle x-ray scattering of nanoparticle self-assembly using a cell with a flat liquid surface
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One important way of forming nanostructures entails the assembly of nanoparticle (NP) monolayers at a liquid surface. Probing this assembly of 11.8-nm-diameter iron oxide NPs by small-angle x-ray scattering (SAXS) is studied using cells with walls at angles designed to significantly reduce the size of the meniscus. This enables the collection of much larger signals in the SAXS images of ordered arrays of NPs at liquid/gas interfaces, as is needed for kinetics studies and x-ray exposure minimization, along with the observation of extremely high degrees of order. Meniscus flattening and improved signal collection are demonstrated for the assembly of ordered arrays of iron oxide NP monolayers at a diethylene glycol surface.
KeywordsNanoparticle self-assembly SAXS GISAXS Liquid surface Meniscus Nanoparticle monolayers
This research used the CMS 11-BM beamline and other resources of the National Synchrotron Light Source II (NSLS-II) and resources of the Center for Functional Nanomaterials, which are U.S. Department of Energy (DOE) Office of Science user facilities operated for the DOE Office of Science by Brookhaven National Laboratory (BNL) under Contract No. DE-SC0012704. We thank Drs. Masafumi Fukuto, Ruipeng Li, and Kevin Yager at the BNL NSLS-II CMS 11-BM beamline for their assistance, and Dr. Oleg Gang, Jason Cardarelli (IGERT program of the National Science Foundation (DGE-1069240)) and Roy Garcia.
Support was provided by the National Science Foundation (CBET-1603043).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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