Process for production of surface-coated inorganic particles

C - Chemistry – Metallurgy – 01 – G

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C01G 49/00 (2006.01) A61K 49/00 (2006.01) B22F 1/02 (2006.01) H01F 1/20 (2006.01) H01F 1/34 (2006.01) H01F 1/36 (2006.01)

Patent

CA 2694536

Nano-sized inorganic particles having uniform particle sizes and precisely controlled particle diameters have already been produced by synthesis in an organic solvent, but these nano-sized inorganic particles are hindered from dispersing in a polar solvent because of the adsorption of a long-chain fatty acid on the surfaces of the particles. Further, it was difficult to form nano-sized inorganic particles dispersible in a polar solvent by replacing the long-chain fatty acid coats. According to the invention, various surface-coated inorganic particles dispersible in polar solvents can be produced from fatty acid-coated inorganic particles by adding a temporary coating substance such as thiomalic acid to a nonpolar solvent containing fatty acid-coated inorganic particles dispersed therein to replace the fatty acid coats by the temporary coating substance, dispersing the inorganic particles coated with the temporary coating substance in a polar solvent, and then adding a coating substance dispersible in a polar solvent, e.g., citric acid to the obtained dispersion to replace the temporary coating substance coats covering the inorganic particles by the coating substance dispersible in a polar solvent.

Des particules inorganiques de taille nanométrique ayant une taille uniforme et un diamètre précisément contrôlé ont déjà été produites par synthèse dans un solvant organique, mais ces particules inorganiques de taille nanométrique ne peuvent pas se disperser dans un solvant polaire à cause de l'adsorption d'un acide gras à longue chaîne sur les surfaces des particules. En outre, il était difficile de former des particules inorganiques de taille nanométrique dispersibles dans un solvant polaire en remplaçant les enrobages d'acide gras à longue chaîne. Selon l'invention, on peut produire différentes particules inorganiques ayant un revêtement de surface dispersibles dans des solvants polaires à partir de particules inorganiques enrobées d'acide gras en ajoutant une substance d'enrobage provisoire telle que de l'acide thiomalique à un solvant non polaire contenant des particules inorganiques enrobées d'acide gras dispersées dans celui-ci pour remplacer les enrobages d'acide gras par la substance d'enrobage provisoire, en dispersant dans un solvant polaire les particules inorganiques enrobées de la substance d'enrobage provisoire et en ajoutant ensuite une substance d'enrobage dispersible dans un solvant polaire, par exemple de l'acide citrique, à la dispersion obtenue pour remplacer les enrobages de substance d'enrobage provisoire recouvrant les particules inorganiques par la substance d'enrobage dispersible dans un solvant polaire.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Process for production of surface-coated inorganic particles does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for production of surface-coated inorganic particles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for production of surface-coated inorganic particles will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1570906

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.