Forces between surfactant-coated ZnS nanoparticles in dodecane: Effect of water

Anna R. Godfrey Alig, Mustafa Akbulut, Yuval Golan, Jacob Israelachvili

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

The forces between mica surfaces confining solutions of spherical and rod-shaped ZnS nanoparticles (diameter ca. 5 nm) coated with hexadecylamine or octadecylamine surfactant in dodecane have been measured in the absence and after the introduction of trace amounts of water. Initially, or at very low water content, the water molecules cause the nanoparticles to aggregate and adsorb on the hydrophilic mica surfaces, resulting in a long-range exponentially decaying repulsive force between the surfaces. After longer times (> 20 h), water bridges nucleate and grow between the nanoparticles and mica surfaces, and attractive capillary forces then cause a long-range attraction and a strong (short-range) adhesion. It is found, as has previously been observed in nonaqueous bulk colloidal systems, that even trace amounts of water have a profound effect on the interactions and structure of nanoparticle assemblies in thin films, which in turn affect their physical properties. These effects should be considered in the design of thin-film processing methodologies.

Original languageEnglish
Pages (from-to)2127-2134
Number of pages8
JournalAdvanced Functional Materials
Volume16
Issue number16
DOIs
StatePublished - 20 Oct 2006

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