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Effect of Anionic Surfactants on Synthesis and Self-Assembly of Silica Colloidal Nanoparticles...

by Wei Wang, Baohua Gu, Liyuan Liang
Publication Type
Journal
Journal Name
Journal of Colloid and Interface Science
Publication Date
Page Numbers
169 to 173
Volume
313
Issue
1

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�e10-3 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.