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Ionic depletion at the crystalline Gibbs layer of PEG-capped gold nanoparticle brushes at aqueous surfaces

TitleIonic depletion at the crystalline Gibbs layer of PEG-capped gold nanoparticle brushes at aqueous surfaces
Publication TypeJournal Article
Year of Publication2017
AuthorsWang, WJ, Zhang, HH, Mallapragada, S, Travesset, A, Vaknin, D
JournalPhysical Review Materials
Volume1
Pagination10
Date Published12
Type of ArticleArticle
ISBN Number2475-9953
Accession NumberWOS:000418772900002
Keywordsbiphasic systems, dimensions, dna, interfaces, Materials Science, salt, Spectroscopy
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.

DOI10.1103/PhysRevMaterials.1.076002
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