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Microemulsion synthesis of fluorinated latex spheres …

T1 - Synthesis of Ni@SiO 2 nanotube particles in a water-in-oil microemulsion template

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In this study, a strategy was developed for the synthesis of nano-sized, silica-ceria, core-shell composites in a water-oil (W/O) microemulsion consisting of water, heptane and the binary surfactants AOT (sulfosuccinic acid bis (2-ethylhexyl) ester sodium salt) and NP-5 (polyoxyethylene (5) nonylphenyl ether). The core-shell, silica-ceria particles were prepared in a stepwise procedure: (1) the precipitation of the core-silica particles in a W/O microemulsion and (2) the surface precipitation of ceria on the core silica dispersed over the microemulsion. The composition of the binary surfactant greatly influenced the growth rate of the core-silica particles. The virial coefficient of diffusion was utilized to estimate the effect of the surfactant composition on the degree of intermicellar interaction that is important for the growth rate of the silica along with the flexibility of the micellar interface and the structure of the water domain. The deposition of the ceria on the core silica was not straightforward because the bulk and surface precipitation competed with each other. The promotion of surface precipitation was attempted by: (1) chemically modifying the silica surface with an organoamine group and (2) slowing down the precipitation rate of the ceria in a semi-batch operation. These attempts successfully produced the nano-sized silica-ceria, core-shell particles, which were evidenced through the TEM, XPS and zeta potential analysis.

T1 - Synthesis of yttrium iron garnet nanoparticles via coprecipitation in microemulsion

AB - We demonstrate a sol-gel approach, using a water-in-oil microemulsion as the template, for the synthesis of hollow and yolk/shell silica nanospheres, which can encapsulate pre-formed hydrophobic nanoparticles, and we then explore these multifunctional hollow nanospheres in cell-labeling applications.

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T1 - Synthesis of WO3 in nanoscale with the usage of sucrose ester microemulsion and CTAB micelle solution

T1 - The synthesis of silica and silica-ceria, core-shell nanoparticles in a water-in-oil (W/O) microemulsion composed of heptane and water with the binary surfactants AOT and NP-5

AB - The aim of the study was to synthesis the CdS nanoparticles via AOT-water-n-heptane microemulsion technique. Ternary phase diagram was constructed to obtain the concentration range of oil, surfactant and water. Three main phases form on the ternary phase diagram of AOT-water-n-heptane, which were gel, cloudy and clear phases. The clear phase was heptane rich region. Meanwhile, cloudy phase have consisted two phases and the gel phase was due to high concentration of AOT. The result showed that clear phase region shrink when the Cd2+ and S2-solvent was added or replaced the water component of the tertiary system. The existence of CdS nanoparticles with average size of 14.0 nm has been calculated by using UV-Vis Spectrometry meanwhile the TEM image showed that the size of CdS nanoparticles was about 49-89 nm. It also have concluded that the same concentration at solvents Cd2+ and S2- does not effected the size of nanoparticles.

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Synthesis and Characterization of Polyaniline Nanoparticle by Inverse Micelle Microemulsion Method

AB - In this study, a strategy was developed for the synthesis of nano-sized, silica-ceria, core-shell composites in a water-oil (W/O) microemulsion consisting of water, heptane and the binary surfactants AOT (sulfosuccinic acid bis (2-ethylhexyl) ester sodium salt) and NP-5 (polyoxyethylene (5) nonylphenyl ether). The core-shell, silica-ceria particles were prepared in a stepwise procedure: (1) the precipitation of the core-silica particles in a W/O microemulsion and (2) the surface precipitation of ceria on the core silica dispersed over the microemulsion. The composition of the binary surfactant greatly influenced the growth rate of the core-silica particles. The virial coefficient of diffusion was utilized to estimate the effect of the surfactant composition on the degree of intermicellar interaction that is important for the growth rate of the silica along with the flexibility of the micellar interface and the structure of the water domain. The deposition of the ceria on the core silica was not straightforward because the bulk and surface precipitation competed with each other. The promotion of surface precipitation was attempted by: (1) chemically modifying the silica surface with an organoamine group and (2) slowing down the precipitation rate of the ceria in a semi-batch operation. These attempts successfully produced the nano-sized silica-ceria, core-shell particles, which were evidenced through the TEM, XPS and zeta potential analysis.

N2 - In this study, a strategy was developed for the synthesis of nano-sized, silica-ceria, core-shell composites in a water-oil (W/O) microemulsion consisting of water, heptane and the binary surfactants AOT (sulfosuccinic acid bis (2-ethylhexyl) ester sodium salt) and NP-5 (polyoxyethylene (5) nonylphenyl ether). The core-shell, silica-ceria particles were prepared in a stepwise procedure: (1) the precipitation of the core-silica particles in a W/O microemulsion and (2) the surface precipitation of ceria on the core silica dispersed over the microemulsion. The composition of the binary surfactant greatly influenced the growth rate of the core-silica particles. The virial coefficient of diffusion was utilized to estimate the effect of the surfactant composition on the degree of intermicellar interaction that is important for the growth rate of the silica along with the flexibility of the micellar interface and the structure of the water domain. The deposition of the ceria on the core silica was not straightforward because the bulk and surface precipitation competed with each other. The promotion of surface precipitation was attempted by: (1) chemically modifying the silica surface with an organoamine group and (2) slowing down the precipitation rate of the ceria in a semi-batch operation. These attempts successfully produced the nano-sized silica-ceria, core-shell particles, which were evidenced through the TEM, XPS and zeta potential analysis.

Dissertation l'argumentation indirecte James essay microemulsion Reverse synthesis
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  • Zinc Oxide—From Synthesis to Application: A Review - MDPI

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    Nanocrystalline lead zirconate titanate (PZT) powders have been synthesized using microemulsion processing route

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Guerbet Compounds - AOCS Lipid Library

AB - SiO 2 nanotubes containing Ni nanoparticles were synthesized in a template nonionic surfactant water-in-oil (w/o) microemulsion, and were characterized by bright-field TEM. The highly defined cylindrical nanotube cavities had a uniform diameter of 12-13 nm; however cavity lengths were shown to be strongly dependent on aging time before silica precursor addition, hydrazine concentration, and synthesis temperature. Depending on synthesis conditions, Ni@SiO 2 (i.e., core@shell) nanotubes attained lengths up to 2 μm. A hypothesis is advanced that gas phases form and remain entrained in reverse-micelles, effecting both their elongation and also the exclusion of agglomerating silica species to outer micellar regions, thereby causing cavity formation. SiO 2 shell thicknesses could be controlled in the range of 5.1 to 12.4 nm by simple variation of the amount of silica precursor used. Furthermore, H 2 chemisorption measurements demonstrated 14-15% Ni dispersions, and N 2 physisorption analyses showed intraparticle pores on the order of 1 nm. These results confirm the accessibility of active metal sites via diffusion through the porous silica shells. Therefore the reported Ni@SiO 2 materials make an interesting addition to the developing class of M 1@M 2O x yolk-shell catalytic materials.

The Guerbet reaction is named after Marcel Guerbet (1861-1938) [1]

N2 - SiO 2 nanotubes containing Ni nanoparticles were synthesized in a template nonionic surfactant water-in-oil (w/o) microemulsion, and were characterized by bright-field TEM. The highly defined cylindrical nanotube cavities had a uniform diameter of 12-13 nm; however cavity lengths were shown to be strongly dependent on aging time before silica precursor addition, hydrazine concentration, and synthesis temperature. Depending on synthesis conditions, Ni@SiO 2 (i.e., core@shell) nanotubes attained lengths up to 2 μm. A hypothesis is advanced that gas phases form and remain entrained in reverse-micelles, effecting both their elongation and also the exclusion of agglomerating silica species to outer micellar regions, thereby causing cavity formation. SiO 2 shell thicknesses could be controlled in the range of 5.1 to 12.4 nm by simple variation of the amount of silica precursor used. Furthermore, H 2 chemisorption measurements demonstrated 14-15% Ni dispersions, and N 2 physisorption analyses showed intraparticle pores on the order of 1 nm. These results confirm the accessibility of active metal sites via diffusion through the porous silica shells. Therefore the reported Ni@SiO 2 materials make an interesting addition to the developing class of M 1@M 2O x yolk-shell catalytic materials.

Jim Yang Lee Group - National University of Singapore

Our group has been actively involved in the synthesis of QDs and magnetic QDs (MQDs) [-]. We have successfully demonstrated the magnetic and fluorescent properties of Fe2O3-CdSe MQDs, silica -coated QDs or MQDs and their application in cell labeling (Figure ) []. The silanization using aminopropyl triethoxysilane (APS) in a reverse microemulsion produced thin silica coating on bare CdSe QDs or Fe2O3-CdSe MQD with surface NH2 groups. The methoxy groups of APS were hydrolyzed and condensed with another APS, exposing surface amine groups on the silanized QDs (SiO2/QDs) for conjugation with oleyl-O-poly(ethyleneglycol)-succinyl-N-hydroxysuccinimidyl ester, denoted as bio-anchored membrane (BAM). The reaction between the amine group and NHS ester resulted in a covalent amide bond formation, leaving the exposed oleyl group for the effective targeting of cell membrane. The labeling of live cell membranes (HepG2 human liver cancer cells and NIH-3T3 mouse fibroblast cells) using confocal laser scanning microscopy (CLSM) indicated the successful conjugation of silica-coated QDs or MQDs with BAM.

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