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Publication

Nanoparticules à noyau métallique recouvert de silice

Heinrich Hofmann, Alke Fink
2006
Patents

Abstract

The invention relates to nanoparticles based on a metal, on a metal alloy or on a metal derivative coated with a silica layer, in which the silica is crystalline silica, in particular crystalline silica in the cristobalite form. They may be prepared from nanoparticles based on amorphous silica by making the latter crystallize by a heat treatment in air or in an inert atmosphere at a temperature between 900 and 1400°C and they may be used as pigments for ceramics or in the biological field.

Official source

https://infoscience.epfl.ch/entities/publication/7a73da2c-2e4e-4e8f-933c-a05aaa622beb

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Heinrich Hofmann, Alke Fink
2006
Patents

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/7a73da2c-2e4e-4e8f-933c-a05aaa622beb

About this result

Related concepts (19)

Silica gel

Silica gel is an amorphous and porous form of silicon dioxide (silica), consisting of an irregular tridimensional framework of alternating silicon and oxygen atoms with nanometer-scale voids and pores. The voids may contain water or some other liquids, or may be filled by gas or vacuum. In the last case, the material is properly called silica xerogel. Silica xerogel with an average pore size of 2.4 nanometers has a strong affinity for water molecules and is widely used as a desiccant.

Silicon dioxide

Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula , most commonly found in nature as quartz. In many parts of the world, silica is the major constituent of sand. Silica is one of the most complex and most abundant families of materials, existing as a compound of several minerals and as a synthetic product. Notable examples include fused quartz, fumed silica, silica gel, opal and aerogels. It is used in structural materials, microelectronics (as an electrical insulator), and as components in the food and pharmaceutical industries.

Biogenic silica

Biogenic silica (bSi), also referred to as opal, biogenic opal, or amorphous opaline silica, forms one of the most widespread biogenic minerals. For example, microscopic particles of silica called phytoliths can be found in grasses and other plants. Silica is an amorphous metal oxide formed by complex inorganic polymerization processes. This is opposed to the other major biogenic minerals, comprising carbonate and phosphate, which occur in nature as crystalline iono-covalent solids (e.g.

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Nanoparticules à noyau métallique recouvert de silice

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