Surface modified ormosil nanoparticles.

Rakesh Kumar Sharma; Shraboni Das; Amarnath Maitra

doi:10.1016/j.jcis.2004.04.019

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PubMed · 15341845

Surface modified ormosil nanoparticles.

Rakesh Kumar Sharma·Shraboni Das·Amarnath Maitra

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Abstract

Organically modified silanes (ORMOSIL) such as vinyl triethoxysilane readily aggregate in the aqueous cores of reverse micelles where the triethoxysilane moieties are hydrolyzed to form a hydrated silica network and the vinyl groups protruded out from the surface of the nanoparticles toward the hydrophobic side of the micellar interface. These particles are spherical and the size distribution of the particles is relatively narrow, with an average diameter of 87 nm. Surface vinyl silica nanoparticles so formed have been oxidized to surface carboxylic silica nanoparticles, followed by chemical conjugation with polyethyleneglycol amine (PEG amine) through the ethyl-3-(3-dimethylaminopropyl) (EDCI) carbodiimide reaction. The characteristic surface groups have been identified by Fourier transform infrared spectroscopy, while the size and the morphology of the particles have been studied by dynamic light scattering and transmission electron microscopy. It has been found that about 80-85% of the carboxylic groups are PEGylated during the EDCI reaction.

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Micelles Microscopy, Electron, Transmission Molecular Structure Nanostructures Particle Size Scattering, Radiation Silicon Dioxide Spectroscopy, Fourier Transform Infrared Surface Properties Journal Article Research Support, Non-U.S. Gov't

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Rakesh Kumar Sharma, Shraboni Das, Amarnath Maitra. 2004-09-15. Surface modified ormosil nanoparticles.. https://doi.org/10.1016/j.jcis.2004.04.019

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