Silicon Dioxide SiO2 Nanoparticles (SiO2, 99%, 8nm, …

The products were characterized by FTIR, TEM and photoluminescence spectroscopy. Transmission Electron Microscopy (Phillips CM-120, operating at 80 kV) was used to analyze the size distribution of the prepared product. TEM samples were prepared by dipping holey-carbon-coated, 400-mesh electron microscope grids into the hexane colloid solution and drying them at 120 °C overnight. Energy dispersive X-ray spectroscopy (EDS) was performed on JOEL 2500SE with an accelerating voltage of 200 kV. The corresponding histogram of silicon nanoparticles size based on a survey of 870 particles from different regions of the grid. UV-vis and PL spectra of silicon colloid solution were obtained on a Cary 100 Bio spectrometer (Varian) and FluoroMax-3P fluorometer, respectively. 1H NMR (300 MHz) spectra were recorded on a Varian Mercury 300 instrument on the dispersions of the octyl capped Si particles, polymer, and polymer-coated octyl capped Si nanoparticles in deuterated chloroform (see ). The FT-IR spectra were collected on a Shimadzu IR Prestige 21 spectrophotometer by dropping the hexane colloid on a KBr plate and allowing the solvent to evaporate. Photoluminescence quantum yield was obtained by comparison of the PL intensity of a nanoparticle sample with that of the solution of quinine sulfate (laser grade) in 0.1M H2SO4 solution. Literature value of 0.54 was taken for the room-temperature PL efficiency of quinine sulfate in 0.1M H2SO4 solution []. Isolated samples were dissolved in chloroform or water and measured in a standard 1-cm quartz cell with controlled optical densities below 0.10 at the excitation wavelength.

Binary compound nanoparticles - Silicon oxide nanoparticles

Silicon Oxide Nanoparticles / Nanopowder SiO2 bulk & research qty manufacturer

Binary compound nanoparticles - Silicon oxide ..

130. Wang YXJ, Quercy-Jouvet T, Wang HH, Li AW, Chak CP, Xuan S, Shi L, Wang DF, Lee SF, Leung PC, Lau CBS, Fung KP, Leung KCF. Efficacy and durability in direct labeling of mesenchymal stem cells using ultrasmall superparamagnetic iron oxide nanoparticles with organosilica, dextran, and PEG coatings. 2011;4:703-15

Functionalised silicon oxide nanoparticles for …

115. Ge S, Shi X, Sun K, Li C, Baker JR, Banaszak Holl MM andOrr BG. A facile hydrothermal synthesis of iron oxide nanoparticles with tunable magnetic properties. 2009;13:13593-9

Silicon Oxide Nanopowder / SiO2 Nanoparticles (SiOx, …

Silicon dioxide porous nanoparticles - YouTube

In conclusion, we have reported the synthesis of water-soluble, luminescent silicon nanoparticles with high quantum yield. The surface of the silicon nanoparticles was modified by octane and capped with hydrophilic polymers. Such water-soluble silicon nanoparticles displayed strong photoluminescence in the blue region of the visible spectrum with an 18% quantum yield. The attached organic molecules allow not only water solubility but also high stability, and coating has little adverse effect on the optical properties of nanoparticles. This synthesis route is simple and thus offers great opportunity for scaled-up preparation of semiconductor materials. The highly PL stable and non-aggregated Si-particles may provide a good alternative to Cd based quantum dots for biomedical applications. Current efforts focus on producing nanoparticles with stable green and red emission with high quantum yields by this method.

Synthesis of Zinc Oxide Nanoparticles - Duration: ..

This paper describes a sol−gel approach for the coating of superparamagnetic iron oxide nanoparticles with uniform shells of amorphous silica. The coating process has been successfully applied to particles contained in a commercial ferrofluid (e.g., the EMG 304 of Ferrofluidics) and those synthesized through a wet chemical process. The thickness of silica coating could be conveniently controlled in the range of 2−100 nm by changing the concentration of the sol−gel solution. Fluorescent dyes, for example, 7-(dimethylamino)-4-methylcoumarin-3-isothiocyanate (DACITC) and tetramethylrhodamine-5-isothiocyanate (5-TRITC), have also been incorporated into the silica shells by covalently coupling these organic compounds with the sol−gel precursor. These multifunctional nanoparticles are potentially useful in a number of areas because they can be simultaneously manipulated with an externally applied magnetic field and characterized in situ using conventional fluorescence microscopy.

Green Synthesis of Zinc Oxide Nanoparticles - …

BLI, bioluminescence imaging; CH, chitosan; CLIO, cross-linked iron oxide; CT, computed tomography; Gd-DTPA, gadolinium diethylene-trianmine pentaacetic acid; FITC, fluoresceine isothiocyanate; FLI, fluorescence imaging; HA, hyaluronic acid; LMWP, low molecular weight protamine; Micron-sized particles, MPs; MR, magnetic resonance; MRI, magnetic resonance imaging; MSC, mesenchymal stem cells; MSNs, mesoporous silica nanoparticles; Nanoparticles, NPs, NSC, neural stem cell; PAA, poly(acrylic acid); PDMAAm, poly(N,N-dimethylacrylamide); PEG, poly(ethylene glycol); PEG-PLA, poly(ethylene glycol)-poly(L-glutamic acid); PEI, poly(ethyleneimine); PEI-SA, stearic acid-grafted polyethyleneimine copolymers; PET, positron emission tomography; PLGA, poly(lactide-co-glycolide); PLL, poly-L-lysine); PLMA: poly(DL-lactic acid-co-α,β-malic acid) copolymer; PMMA, poly(methylmethacrylate); , longitudinal relaxivity; , transverse relaxivity; RES, reticuloendothelial system; RITC: rhodamine B isothiocyanate; SPECT, single photon emission computed tomography; SPIONs, superparamagnetic iron oxide nanoparticles;, longitudinal relaxation time; , transverse relaxation time; TAs, transfection agents.