Unagglomerated core/shell nanocomposite particles

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 9/02 (2006.01)

Patent

CA 2569067

The present invention provides a method for the synthesis of unagglomerated, highly dispersed, stable core/shell nanocomposite particles comprised of preparing a reverse micelle microemulsion that contains nanocomposite particles, treating the microemulsion with a silane coupling agent, breaking the microemulsion to form a suspension of the nanocomposite particles by adding an acid/alcohol solution to the microemulsion that maintains the suspension of nanocomposite particles at a pH of between about 6 and 7, and simultaneously washing and dispersing the suspension of nanocomposite particles, preferably with a size exclusion HPLC system modified to ensure unagglomeration of the nanocomposite particles. The primary particle size of the nanocomposite particles can range in diameter from between about 1 to 100 nm, preferably from between about 10 to 50 nm, more preferably about 10 to 20 nm, and most preferably about 20 nm.

La présente invention concerne un procédé permettant de synthétiser des particules nanocomposites de type coeur/coquille stables hautement dispersées non agglomérées. Le procédé décrit dans cette invention consiste à préparer une microémulsion de micelles inverses contenant des particules nanocomposites; à traiter la microémulsion avec un agent de couplage au silane; à rompre la microémulsion afin de former une suspension de particules nanocomposites par ajout d'une solution acide/alcool à la microémulsion qui maintient la suspension des particules nanocomposites à un pH compris entre environ 6 et environ 7; puis à laver et à disperser simultanément la suspension de particules nanocomposites, de préférence au moyen d'un système HPLC par perméation de gel modifié de manière garantir la non agglomération des particules nanocomposites. La taille particulaire primaire des particules nanocomposites peut être comprise entre environ 1 et 100 nm de diamètre, de préférence, entre environ 10 et 50 nm de diamétre, mieux encore, entre environ 10 et 20 nm et, dans un mode de réalisation optimal, environ 20 nm.

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