Silica nanoparticle crystals and ordered coatings using lys-sil and a novel coating device

Mark A. Snyder, J. Alex Lee, Tracy M. Davis, L. E. Scriven, Michael Tsapatsis

Research output: Contribution to journalArticlepeer-review

72 Scopus citations

Abstract

Silica nanoparticles with a narrow particle size distribution and controlled diameters of 10-20 nm are synthesized via hydrolysis and hydrothermal aging of tetraethylorthosilicate in an aqueous L-lysine solution. Cryo-transmission electron microscopy (cryo-TEM) reveals that the silica nanoparticles assemble to form close-packed nanoparticle crystals over short length scales on carbon-coated grids. Evaporative drying of the same sols results in nanoparticle stability and remarkable long-range facile ordering of the silica nanoparticles over scales greater than 10 μm. Whereas small-angle X-ray scattering (SAXS) and small-angle neutron scattering (SANS) discount the possibility of a core (silica)-shell (lysine) structure, the possibility remains for lysine occlusion within the silica nanoparticles and concomitant hydrogen bonding effects driving self-assembly. Facile ordering of the silica nanoparticles into multilayer and monolayer coatings over square-centimeter areas by evaporation-induced self-assembly is demonstrated using a novel dip-coating device.

Original languageEnglish (US)
Pages (from-to)9924-9928
Number of pages5
JournalLangmuir
Volume23
Issue number20
DOIs
StatePublished - Sep 25 2007

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