The pH-dependent adhesion of nanoparticles to self-assembled monolayers on gold

The effect of pH on the adhesion of silica and polystyrene latex nanoparticles, presenting hydroxyl and carboxylic acid surface chemistries respectively, to self-assembled monolayers (SAMs) has been investigated. The SAMs studied were 1-dodecanethiol, 11-mercaptoundecanoic acid and an original pyrid...

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Bibliographic Details
Published in:Thin solid films 2008-03, Vol.516 (10), p.2987-2999
Main Authors: Bowen, James, Manickam, Mayandithevar, Evans, Stephen D., Critchley, Kevin, Kendall, Kevin, Preece, Jon A.
Format: Article
Language:English
Subjects:
Adhesion
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Nanocrystalline materials
Nanoparticle
Nanoscale materials and structures: fabrication and characterization
p Ka
Physics
Self-assembled monolayer
Solid surfaces and solid-solid interfaces
Surface chemistry
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
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Summary:The effect of pH on the adhesion of silica and polystyrene latex nanoparticles, presenting hydroxyl and carboxylic acid surface chemistries respectively, to self-assembled monolayers (SAMs) has been investigated. The SAMs studied were 1-dodecanethiol, 11-mercaptoundecanoic acid and an original pyridine-terminated SAM. Adhesion of nanoparticles to the SAMs was found to decrease with increasing pH due to increased repulsive forces between surfaces, as a result of the deprotonation of surface moieties on the nanoparticles. A range of surface morphologies for the adsorbed nanoparticles was observed for the systems studied.
ISSN:0040-6090
1879-2731
DOI:10.1016/j.tsf.2007.11.002