Effect of anionic surfactants on synthesis and self-assembly of silica colloidal nanoparticles

Effects of the anionic surfactants, sodium dodecyl sulfate and sodium oleate, on the formation and properties of silica colloidal nanoparticles were investigated. At a concentration of ∼ 1 × 10 −3  M , adsorption of anionic surfactants increased particle size, monodispersity, and negative surface ch...

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Bibliographic Details
Published in:Journal of colloid and interface science 2007-09, Vol.313 (1), p.169-173
Main Authors: Wang, Wei, Gu, Baohua, Liang, Liyuan
Format: Article
Language:English
Subjects:
ADSORPTION
CATALYTIC EFFECTS
CHARGE DENSITY
Chemistry
Colloidal state and disperse state
COLLOIDS
Exact sciences and technology
FCC LATTICES
General and physical chemistry
MATERIALS SCIENCE
Nanoparticles
NANOSTRUCTURES
PARTICLE SIZE
Photonic crystals
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Self-assembly
SILICA
Surface physical chemistry
Surfactant
SURFACTANTS
SYNTHESIS
Thin film
THIN FILMS
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Summary:Effects of the anionic surfactants, sodium dodecyl sulfate and sodium oleate, on the formation and properties of silica colloidal nanoparticles were investigated. At a concentration of ∼ 1 × 10 −3  M , adsorption of anionic surfactants increased particle size, monodispersity, and negative surface charge density of synthesized silica particles. As uniformity of particle size and particle–particle interactions increase, colloidal photonic crystals readily self-assemble without extensive washing of the synthesized silica nanoparticles. The photonic crystals diffract light in the visible region according to Bragg's law. The assembled colloidal particle arrays exhibit a face-centered cubic structure in dried thin films. This study offers a new approach for producing ordered colloidal silica thin films.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2007.04.042