SILICA - Dissertations.se

Stockholms universitet - CERN Indico

Mesostructured silica particles have been widely applied in the areas of catalysis, adsorption and separation processes[23].Inpar- 2019-11-13 Nanosized particles with narrow particle size distribution, 1.03 ± 0.27 nm, were obtained when the reduction step was carried out at 1600 rpm.Based on these results, the key synthesis parameters to obtain small nanoparticles with a narrow particle size distribution are the concentration of the capping agent and the stirring rate used during the reduction of the Pd precursor in toluene. Pitchumani, R, Schmidt-Ott, A & Coppens, MO 2006, ' Aerosol synthesis of mesostructured silica particles ', Inside Pores Workshop, 19/03/06 - 23/03/06. Aerosol synthesis of mesostructured silica particles. Large pore mesoporous silica nanoparticles (LP-MSNs) functionalized with poly-L-lysine (PLL) were designed as a new carrier material for gene delivery applications. The synthesized LP-MSNs are 100-200 nm in diameter and are composed of cage-like pores organized in a cubic mesostructure. The size of … Strongly fluorescent micrometer-sized mesostructured polythiophene–silica composite particles were synthesized, and their absorption and fluorescence properties were found to be dependent on their mesostructures.

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In this respect, synchrotron SAXS is a very versatile technique Several groups reported on the production of mesoscopically for tracking the structural changes during mesophase formation structured particles using the aerosol-assisted EISA process,6,9,14 by time-resolved measurements.7,11,12 In particular, in situ in- resulting in 10 20-μm-diameter hollow particles with thin vestigations of mesostructures in the gas phase using SAXS help ordered silica walls and also compact nanostructured Large pore mesoporous silica nanoparticles (LP-MSNs) functionalized with poly-L-lysine (PLL) were designed as a new carrier material for gene delivery applications. The synthesized LP-MSNs are 100-200 nm in diameter and are composed of cage-like pores organized in a cubic mesostructure. The size of … A family of mesoporous molecular sieves (denoted MSU-G) with vesiclelike hierarchical structures and unprecedented thermal (1000°C) and hydrothermal stabilities (more than 150 hours at 100°C) The particle size of the MCMS spheres and pore diameter are tunable in a certain range with 100% yield. A synthesis mechanism of the mesoporous silica shell was proposed that proceeds via three main stages. The silica shell proved to be effective on protecting the cores from leaching out in acidic conditions.

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Mesostructured materials: Synthesis towards applications  and 3D hexagonal) mesostructure andparticle morphology of spherical mesoporous silica particlesusing the emulsion and solvent evaporation (ESE) method  Controlled deposition of lipid liquid crystalline nanoparticles to obtain role of the co-structure directing agent in the formation of mesostructured silica Finding a protocol for adsorbing disc-like mesoporous silica particles  monolayers of alkoxylated silica particles on air-liquid interface", Langmuir, mesostructured silica pigment dispersed in latex films”, J. Mater. Decoupling particle formation from intraparticle ordering in mesostructured silica colloids. Andreas Sundblom, C. L. P. Oliveira, J. S. Pedersen et al.

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Mesostructured silica thin films and particles prepared by surfactant‐templated sol–gel techniques are highly versatile substrates for the formation of functional materials. The ability to deliberately place molecules possessing desired activities in specific spatially separated regions of the nanostructure is an important feature of these materials.

A series of hierarchically mesostructured silica particles with a morphology similar to that of pomegranate can be obtained by simply adjusting the mass ratio of C12-SH to CTAB. Mesostructured silica particles have been widely applied in the areas of catalysis, adsorption and separation processes .
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such as the particle diameter (less than 200 nm), shell thickness, porestructures, and morphologies. The formationmechanism of the hierarchically mesostructured silica particles is proposed and discussed. This technique can be readily extended to synthesize other mesostructures with specific morphologies and architec- silica particles at concentration values higher than 0.75 wt.%. Conversely, the addition of mesostructured functionalized silica particles at lower concentration into the PES matrix is proposed in this work to explore two effects: porous ordering and silica functionalization.

In particular, SBA-15 has been one of the most extensively studied materials due to its chemical, thermal and mechanical stability, large pore size with narrow pore size distribution, high surface area and easy surface functionalization. In particular, mesoporous silica particles, with pore size ranging between 2 and 50 nm in diameter appear to be a valid substitute for traditional drug carriers, thanks to their versatility . Indeed, mesoporous silica carriers can be loaded with curcumin, which can afterwards be released in a sustained way, so enhancing its pharmacological effects [ 10 ]. Magnetically separable mesostructured silica with an unobstructed pore system was fabricated through the deposition of cobalt nanoparticles on the outer surface of the submicron-sized silica particles.
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Azobenzene‐derivatized mesostructured silica particles loaded with guest molecules and release of the molecules from the pores by the back‐and‐forth wagging motion of light‐activated azobenzenes. Inthispaper,wereportasimpleandeasysynthetictechniqueto produce monodisperse and hierarchical mesostructured silica particles with a uniform size by using C12-SH and CTAB as cosurfactants.Thedual-surfactant-templatetechniqueconducted underoptimalconditionsandselectingtheproperratioofthetwo surfactants enable independent control of structural parameters such as the particle diameter (less than 200 nm), shell thickness, porestructures, and morphologies. Silica nanoparticles exhibiting hexagonal, cubic, and vesicular mesostructures have been prepared using aerosol assisted, self-assembled process. This process begins with homogennous aerosol droplets containing silica source, water, ethanol, and surfactant, in which surfactant concentration is far below the critical micelle concentration (cmc). mesostructured silica particles, moreover in the reduction of the particle size keeping a proper good mesoorder, for further applications.

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Iron Oxide Nanoparticles in Ordered Large Mesoporous Silicas: Influence of the Pore Amino-functionalization of large-pore mesoscopically ordered silica by a A., 2003, Nanotechnology in Mesostructured Materials, Proceedings of the 3  Airborne Wear Particles from Disc Brakes Interlaced Particles in Tilings and Random Matrices Mesostructured Particulate Silica Materials with Tunable. Mesostructured particulate silica materials with tunable pore size. : synthesis On the forward filtering backward smoothing particle approximations of the  190d Multi-Scale Assembly of Silica Sphere Particles through Aerosol 120a Diffusion of C7 Hydrocarbons in Mesostructured Zeolitic Ul-Zsm-5 Materials. Mikael, Photochromic mesostructured silica pigments dispersed in latex films, incorporated in hybrid organic/inorganic silica particles, Proceedings of SPIE,  A technology assessment of carbon nanoparticles : production energy requirements and Colloidal suspensions of mesostructured silica / Andreas.

The synthesized LP-MSNs are 100-200 nm in diameter and are composed of cage-like pores organized in a cubic mesostructure. The size of … Strongly fluorescent micrometer-sized mesostructured polythiophene–silica composite particles were synthesized, and their absorption and fluorescence properties were found to be dependent on their mesostructures. Two cationic trimethylammonium bromide surfactants carrying a thiophene group at the end of their hydrophobic tail were prepared to serve as both structure-directing agents and Stable colloidal suspensions of ordered mesostructured silica have been prepared in a concentrated reaction solution under mild acidic conditions using an inorganic silica source and Pluronic P123. This synthesis method results in a high yield, and it is also suitable for studies of formation and growth mechanisms of colloidal mesostructured silica particles.