Fabrication of hollow silica spheres using droplet templates derived from a miniemulsion technique

Sustainable and Very-Low-Temperature Wet-Chemistry Routes for the Synthesis of Crystalline Inorganic Nanostructures

“…Whereas for silica several examples are reported [ 291 ], for metal compounds such as metal oxides and chalcogenides, reports on the formation of hollow particles by soft-template methods are much more limited. Recently, Muñoz-Espí et al successfully addressed the synthesis of transition metal oxides and hydroxides of group 4 (i.e., TiO 2 , ZrO 2 , and HfO 2 ) by exploiting the sol-gel precipitation of zirconium and hafnium hydroxides (ZrO(OH) 2 · H 2 O and HfO(OH) 2 · H 2 O) at the droplet interface by creating interfacial species through the addition of triethylamine to water in-oil miniemulsions containing the inorganic precursor (zirconium or hafnium oxychloride).…”

Effect of textural properties of alumina support on the catalytic performance of Ni/Al 2 O 3 catalysts for hydrogen production via methane decomposition

“…The alumina hollow sphere support was synthesized by modifying the method reported by Peng et al (Peng et al, 2008). Briefly, 2 g twin 60 surfactant was dissolved in 98 g kerosene petroleum fraction as an oil phase and magnetically stirred for 5 min.…”

A microemulsion-template-interfacial-reaction route to copper sulfide hollow spheres

“…Various inorganic and polymer hollow spheres have been synthesized by using different templates including inorganic core [6], surfactant micelles [7], polymer [8,9], bubbles [10] and microemulsion droplets [11,12]. Microemulsions are transparent, isotropic and thermodynamically stable liquid media with nanosized water (or oil) droplets that are dispersed in a continuous oil (or water) phase and stabilized by surfactant molecules at the water/oil interface.…”

“…The oil/water interface of the oil droplets can be used as a template for preparation of hollow spheres [11,12,17,18]. However these routes must use the oil droplets as reactive precursors [12,18] or need the interactions between the oil droplets interface and a reactant [11,17]. The application of these routes will be limited by the difficulty in preparing different hollow spheres.…”