Showing papers on "Nanoparticle published in 1990"
TL;DR: These 30–50 nm nanoparticles were found to adsorb efficiently both hydrophilic (ampicillin) and hydrophobic (dexamethasone) drugs, and could open interesting perspectives for the delivery of drugs to sites other than the reticuloendothelial system.
146 citations
TL;DR: The degradation rate was found to decrease with increasing alkyl chain length from methyl-, ethyl-, isobutyl- to isohexylcyanoacrylate particles, and polymer coating and fluorescent labelling had little effect on the rate of degradation.
135 citations
Patent•
18 Oct 1990
TL;DR: In this article, a dielectric nano-core, a metal shell over that core and a silver halide (14c) coating over the metal shell is described. But the method of forming metal (14b) coated dielectrics is not discussed.
Abstract: Methods of coating nanoparticles (30) with one or more layers of various types of materials such as metals (30b), polymers (30c) and halides (30d), and nanoparticles formed by those methods. A first embodiment of the invention is a method of forming silver halide (12b) coated dielectric nanoparticles (12a), and a second embodiment is a method of forming metal (14b) coated dielectric nanoparticles (14a). A first nanoparticle according to this invention comprises a dielectric nano-core and a silver halide coating; and a second nanoparticle comprises a dielectric nano-core, a metal shell over that core and a silver halide (14c) coating over the metal shell. A further nanoparticle of this invention comprises a dielectric nano-core (16a), a silver halide shell (16b) over the core and a metal shell (16c) over the silver halide; and a still further nanoparticle comprises a dielectric core (20a), a first shell of a first metal (20b) and a second shell (20c) of a second metal.
25 citations
TL;DR: In this article, a new technique has been developed to condense nanoparticles (clusters) of SiC and other nonoxide materials in a nonthermal microwave plasma, using silane and acetylene precursors in an Ar diluent.
Abstract: A new technique has been developed to condense nanoparticles (clusters) of SiC and other nonoxide materials in a nonthermal microwave plasma. The experimental rationale and approach is described. It utilises silane and acetylene precursors in an Ar diluent, with the synthesis carried out in a microwave plasma at a pressure of ~1 torr. The plasma conditions have been characterised, as have the effect of important parameters (gas ratios, flow rates and pressure) on the product nanoparticles. The resultant nanoparticles have been characterised ex-situ by TEM, Auger, and XPS spectroscopy. SiC particles collected are ~5nm in size, with cubic, hexagonal and rhombohedral polytypes observed. Silicon nitride has been synthesised similarly by using silane and nitrogen as the precursor gases. Implications of the new technique are discussed.
1 citations