Preparation of Highly Monodispersed Hybrid Silica Spheres Using a One-Step Sol−Gel Reaction in Aqueous Solution

Abstract

The successful one-step preparation method of monodisperse hybrid silica particles was studied using organosilane chemicals in aqueous solution. In general, almost all of the hybrid silica materials were made by a complex method where organic materials were coated on the surface of silica substrate via chemical reaction. However, our novel method can be applied to prepare colloidal hybrid particles without using substrate material. This method has three advantages: (i) this simple method gives the opportunity to prepare hybrid particles with high monodispersity through the self-hydrolysis of various organosilane monomers in aqueous solution, (ii) this efficient method can be applied to load lots of organic functional groups on the surface of silica particles through a one-step preparation method using only organosilane, and (iii) this effective method can be used to control the particle size of the product by changing the experimental conditions such as the concentration of the precursor or the reaction temperature. Detailed characterization of the hybrid particles by scanning electron microscopy, transmission electron microscopy, and thermogravimetric analysis (TGA) was performed to elucidate the morphologies and properties of the hybrid silica particles.

Flame retardant and hydrophobic cotton fabrics from intumescent coatings

“…On the other hand, as a blowing agent, ADP releases inert gases to dilute the oxygen concentration in the air. Moreover, ADP is able to catalyze the hydrolysiscondensation of MTMS to form a Si-O-Si network structure with a low surface energy [29,[34][35][36][37][38][39], as shown in Scheme 1. According to the previous research [40], amine salts can interact with clays, causing clay nanoplatelets to deposit in stacks rather than as individual sheets.…”

Silica Nanoparticles with Proton Donor and Proton Acceptor Groups: Synthesis and Aggregation

“…1, method C) we have chosen the Stöber method as a starting point [20]. A modified Stöber method in which silica particles are formed from functional trialkoxyorganosilanes was developed relatively recently [20][21][22][23][24][25]. Initially, we attempted the polycondensation with low concentrations of 1-phenyl-3-(3-(trimethoxysilyl)-propyl)urea 2, using the experimental conditions similar to those reported for (2-(3,4-epoxycyclohexyl)-ethyltrimethoxysilane) [24].…”

One-Step Microemulsion Method Synthesis for Monodisperse organic Functionalized silica micro/nano spheres

“…Compared with the post-grafting method, co-condensation synthesis involves the simultaneous condensation of corresponding silica and organosilica precursors. This case may result in decrease of order degree with increasing concentration of (R'O) 3 SiR in the reaction mixture [14][15].…”