The experimental conditions were optimized for the synthesis of amorphous SiO2 particles by the reaction of neutralization of sodium silicate solution with H2SO4 solution Amorphous SiO2 particles were characterized by XRD, FT-IR, FE-SEM, EDS and microelectrophoresis The amorphous peak was located at 2θ = 218o in the XRD pattern Primary SiO2 particles were ~ 15 to ~ 30 nm in size and they aggregated into bigger particles Amorphous SiO2 particles showed a specific surface area up to 130 m2g-1, dependent on the parameters of the precipitation process The EDS spectrum of amorphous SiO2 particles did not show contamination with sulfate or other ions, which cannot be excluded in traces pHzpc =17 was obtained by microelectrophoresis

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Precipitation of amorphous SiO2 particles and their properties

Review on the physicochemical treatments of rice husk for production of advanced materials

Magnetic iron oxide (IO) nanoparticles with a long blood retention time, biodegradability and low toxicity have emerged as one of the primary nanomaterials for biomedical applications in vitro and in vivo. IO nanoparticles have a large surface area and can be engineered to provide a large number of functional groups for cross-linking to tumor-targeting ligands such as monoclonal antibodies, peptides, or small molecules for diagnostic imaging or delivery of therapeutic agents. IO nanoparticles possess unique paramagnetic properties, which generate significant susceptibility effects resulting in strong T2 and T*2 contrast, as well as T1 effects at very low concentrations for magnetic resonance imaging (MRI), which is widely used for clinical oncology imaging. We review recent advances in the development of targeted IO nanoparticles for tumor imaging and therapy.

/pdf/targeted-magnetic-iron-oxide-nanoparticles-for-tumor-imaging-4swzt0k5w0.pdf

Targeted magnetic iron oxide nanoparticles for tumor imaging and therapy

Rapid magnetic solid-phase extraction based on magnetite/silica/poly(methacrylic acid―co―ethylene glycol dimethacrylate) composite microspheres for the determination of sulfonamide in milk samples

A green route to preparation of silica powders with rice husk ash and waste gas

Synthesis of silica powders by pressured carbonation

Magnetic poly(methyl methacrylate) (PMMA) microspheres were prepared by double-miniemulsion polymerization. First, oleic acid coated magnetite particles synthesized by means of coprecipitation were dispersed into octane to obtain a ferrofluid. The ferrofluid and MMA were emulsified to form O/W emulsion, respectively. Subsequently two miniemulsions were mixed together for polymerization. The obtained magnetic polymer particles were characterized by, Fourier transform infrared spectroscopy, transmission electron microscopy, scanning electron microscopy, X-ray powder diffraction, and thermogravimetry. The results showed that oleic acid coated magnetite particles were well encapsulated in PMMA. The effects of initiator dosage and monomer concentration on the conversion of MMA were also investigated. (C) 2008 Wiley Periodicals, Inc. J Appl Polym Sci 112:89-98, 2009

Double-Miniemulsion Preparation of Fe3O4/Poly(methyl methacrylate) Magnetic Latex

Preparation of silica nanoparticles using silicon tetrachloride for reinforcement of PU

To increase the applicability of multiwalled carbon nanotubes (MWCNTs), functional groups were generated on the generally inert surface of MWCNTs using gliding arc (GA) plasma. MWCNTs were modified using plasma polymerization with styrene (St) as monomer. The surface compositional and structural changes that occur on MWCNTs were investigated using FT-IR, Raman spectroscopy, BET surface area, and elemental analysis. Dispersion of the treated MWCNTs in different solvents was evaluated. Transmission electron microscopy images showed that the plasma-treated MWCNTs had a better dispersion than the untreated ones in nonpolar solvents. Subsequently, MWCNTs-reinforced polypropylene (PP) composites were prepared by internal batch mixing with the addition of 1.0 wt % MWCNTs. The morphology of MWCNTs/PP nanocomposites was studied through scanning electron microscopy. Observations of SEM images showed that the plasma-treated MWCNTs had a better dispersion than the untreated MWCNTs either on the composite fracture surfaces or inside the PP matrix. Moreover, the mechanical tests showed that the tensile strength and elongation at break were improved with the addition of polystyrene-grafted MWCNTs. (c) 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

X. Cai

Papers

Synthesis of silica powders by pressured carbonation

Double-Miniemulsion Preparation of Fe3O4/Poly(methyl methacrylate) Magnetic Latex

Preparation of silica nanoparticles using silicon tetrachloride for reinforcement of PU

Surface modification of multiwalled carbon nanotubes via gliding arc plasma for the reinforcement of polypropylene