Porous silica-coated hollow gold-silver nanoshells were successfully synthesized utilizing a procedure where the porous silica shell was produced prior to the transformation of the metallic core, providing enhanced control over the structure/composition of the bimetallic hollow core. By varying the reaction time and the precise amount of gold salt solution added to a porous silica-coated silver...

Abstract Uniform colloidal monodispersed silica nanoparticles were synthesized via stöber method using ammonia as a basic catalyst. Field Emission Scanning Electron Microscope (FESEM) was confirmed the homogeneous nanospheres. The decrease of TEOS concentration (0.067 to 0.012 mol L-1) and an increase of H2O concentration (3 to 14 mol L-1) at 14 mol L-1 NH3 fixed accelerated the rate of h...

in order to understand the importance of particle size and agglomeration for nano-eco-toxicological studies in aquatic environments, the acute toxicity of two different types (suspended powder and colloidal) of silver nanoparticles (agnps) were studied in alevin and juvenilerainbow trout. fish were exposed to each type of agnps at nominal concentrations of 0.032, 0.1, 0.32, 1, 3.2, 10, 32, and ...

Porous silica particles have shown applications in various technological fields including their use as catalyst supports heterogeneous catalysis. The mesoporous ordered porosity, high surface area, and good chemical stability. These interesting structural or textural properties make porous an attractive material for catalysis reactions. colloidal nature of the is highly useful catalytic it guar...

The properties of particles formed during spray drying are largely determined by the properties of the precursors and the drying conditions. The thermal and mass transfer histories significantly affect the structure formation (and subsequent functionality) and the processes are indeed very complex, particularly when dealing with polydisperse droplets as in conventional spray driers. Here a more...

metal nanoshells consists of a dielectric core surrounded by a thin noble metal shell, possess unique optical properties that render nanoshells attractive for use in different technologies. this paper reports a facile method for growth of small gold nanoparticles on the functionalized surface of larger silica nanoparticles. mono-dispersed silica particles and gold nanoparticles were prepared by...

Hierarchical microstructures of colloidal crystals have attracted enormous research efforts due to their potential uses in display devices, optical communications, catalytic supports, biosensors, and acoustic materials. Recent progress in selfassembly approaches for such microstructures has shown that regular arrays of microspheres can be easily grown by several clever ways based on well-establ...

We present a microfluidic platform that allows undergoing different chemical operations in a nanoliter droplet starting from the colloidal suspension of magnetic iron oxide (γ-Fe2O3) nanoparticles "NPs" (ferrofluid). These operations include: mixing, flocculation, magnetic decantation, colloidal redispersion, washing, surface functionalization, heating and colloidal assembly. To prove the platf...