Publication Date

12-14-2017

Department

Ames Laboratory; Physics and Astronomy; Chemical and Biological Engineering

Campus Units

Chemical and Biological Engineering, Physics and Astronomy, Ames Laboratory

OSTI ID+

1413364

Report Number

IS-J 9553

DOI

10.1103/PhysRevMaterials.1.076002

Journal Title

Physical Review Materials

Volume Number

1

Issue Number

7

First Page

076002

Abstract

In situ surface-sensitive x-ray diffraction and grazing incidence x-ray fluorescence spectroscopy (GIXFS) methods are combined to determine the ionic distributions across the liquid/vapor interfaces of thiolated-polyethylene-glycol–capped gold nanoparticle (PEG-AuNP) solutions. Induced by the addition of salts (i.e., Cs2SO4) to PEG-AuNPs solutions, two-dimensional hexagonal lattices of PEG-AuNPs form spontaneously at the aqueous surfaces, as is demonstrated by x-ray reflectivity and grazing incidence small-angle x-ray scattering. By taking advantage of element specificity with the GIXFS method, we find that the cation Cs+ concentration at the crystalline film is significantly reduced in parts of the PEG-AuNP film compared with that in the bulk.

Language

en

Department of Energy Subject Categories

36 MATERIALS SCIENCE

Publisher

Iowa State University Digital Repository, Ames IA (United States)

Share

COinS