Synthesis of colloidal Janus nanoparticles by asymmetric capping of mesoporous silica with phenylsilsesquioxane

Abstract

Colloidal mesoporous silica nanoparticles asymmetrically capped with non-porous phenylsilsesquioxane have been prepared by adding phenyltriethoxysilane to an aqueous dispersion of mesostructured silica-surfactant composite nanoparticles. The integration of colloidal stability, mesoporosity and the Janus structure is quite promising for materials design applicable in various fields, including catalysis, biomedicine and coatings.

Two‐Photon‐Excited Silica and Organosilica Nanoparticles for Spatiotemporal Cancer Treatment

“…Such systems include disulfide‐ and tetrasulfide‐doped PMO NPs (for glutathione‐mediated biodegradation in cells), and degradable oxamide‐ or lysine‐doped PMO NPs. Fourth, solid nonporous BS NPs can also be constructed from bridged multi‐organoalkoxysilanes (Figure D) . The absence of specific interactions between micelles and bridged organoalkoxysilanes produces dense NPs with high organic content in the composite matrix …”

Surfactant-free synthesis of hollow mesoporous organosilica nanoparticles with controllable particle sizes and diversified organic moieties

“…In the shell, mesopores exist as voids between tiny organosilica nanoparticles. Because the stability against hydrolysis at elevated pH of pure silica is much lower than that of organosilica, 42,43 the SN cores can be removed easily by relatively moderate base treatments, while keeping the high dispersibility of the resulting hollow nanoparticles. Recently, by employing similar silica etching strategies, other groups have also reported the syntheses of hollow and yolk/shell mesoporous organosilica nanoparticles but their procedures require surfactants to generate mesoporous within the organosilica shells.…”

Dumbbell‐Shaped Bi‐component Mesoporous Janus Solid Nanoparticles for Biphasic Interface Catalysis

“…It is well‐recognized that the emulsifying abilities of Janus particles strongly depend on their morphology and chemical composition . To date, sphere,– rod, film, snowman, mushroom, and dumbbell Janus particles have been successfully synthesized. Among these morphologies, dumbbell‐shaped Janus particles are an ideal candidate for designing interface‐active solid catalysts because they are inclined to be in a single orientation perpendicular to the oil–water interface, thus allowing for exquisite controls over chemical reactions in biphasic mixtures reported by Resasco and co‐workers .…”