Advanced Materials: TechConnect Briefs 2015Advanced Materials TechConnect Briefs 2015

Nanoparticle Synthesis & Applications Chapter 5

Morphology and Size Control of Mesoporous ORMOSIL Particles

G.I. Jung, J.S. Kim, S.M. Koo
Hanyang University, Korea

pp. 227 - 230

Keywords: morphology, size, mesoporous, ORMOSIL particles

Mesoporous ORMOSIL particles with tailored morphology and/or controlled size were prepared by a simple two-step process. The first step, synthesis of monodisperse ORMOSIL particles with multi-layered structure, involved a one-pot process in an aqueous solution using organosilane monomers or the mixture of organosilane monomers. In the second step, the ORMOSIL particles were treated with a mixture of water and alcohol to produce raspberry shaped, hollow, and rattle type structures. This mild etching process was efficient to dissolve selectively some of organosilane functional groups within the ORMOSIL particles but not their main silica frameworks, leading to formation of mesoporous particles. Surface roughness, shell thickness, and size of the resultant particles were controlled by manipulating synthetic parameters such as the concentration of the silane monomers as well as the dissolution parameters such as temperature and type of solvent. Compared to the previously developed synthetic methods, our strategy offers a simple, economical way to produce complicated nanostructured particles that can provide several novel properties favorable for practical applications. It is also more environmentally friendly by avoiding the use of corrosive etching chemicals and external templates.