Forced desorption of nanoparticles from an oil-water interface.
File(s)
Accepted version
Supporting information
Author(s)
Garbin, V
Crocker, JC
Stebe, KJ
Type
Journal Article
Abstract
While nanoparticle adsorption to fluid interfaces has been studied from a fundamental standpoint and exploited in application, the reverse process, that is, desorption and disassembly, remains relatively unexplored. Here we demonstrate the forced desorption of gold nanoparticles capped with amphiphilic ligands from an oil-water interface. A monolayer of nanoparticles is allowed to spontaneously form by adsorption from an aqueous suspension onto a drop of oil and is subsequently compressed by decreasing the drop volume. The surface pressure is monitored by pendant drop tensiometry throughout the process. Upon compression, the nanoparticles are mechanically forced out of the interface into the aqueous phase. An optical method is developed to measure the nanoparticle area density in situ. We show that desorption occurs at a coverage that corresponds to close packing of the ligand-capped particles, suggesting that ligand-induced repulsion plays a crucial role in this process. © 2011 American Chemical Society.
Date Issued
2012-01-24
Start Page
1663
End Page
1667
Journal / Book Title
Langmuir
Volume
28
Issue
3
Copyright Statement
Copyright © 2011 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Langmuir, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/la202954c
Identifier
http://www.ncbi.nlm.nih.gov/pubmed/21932845
Coverage Spatial
United States