Metal nanoshells

B - Operations – Transporting – 01 – J

Patent

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31/121, 345/43,

B01J 13/02 (2006.01) C04B 35/626 (2006.01) C09C 1/30 (2006.01) C23C 22/00 (2006.01) G01J 1/00 (2006.01) G01J 5/20 (2006.01) G01N 21/65 (2006.01) G02F 1/35 (2006.01) G02F 1/355 (2006.01) G21K 1/10 (2006.01)

Patent

CA 2329436

The present invention is for particulate compositions and methods for producing them that can absorb or scatter electromagnetic radiation. The particles are homogeneous in size and are comprised of a nonconducting inner layer that is surrounded by an electrically conducting material. The ratio of the thickness of the nonconducting layer to the thickness of the outer conducting shell is determinative of the wavelength of maximum absorbance or scattering of the particle. Unique solution phase methods for synthesizing the particles involve linking clusters of the conducting atoms, ions, or molecules to the nonconducting inner layer by linear molecules. This step can be followed by growth of the metal onto the clusters to form a coherent conducting shell that encapsulates the core.

La présente invention concerne des compositions particulaires et leurs procédés de production, ces compositions particulaires pouvant absorber ou diffuser un rayonnement électromagnétique. Les particules sont de taille homogène et sont formées d'une couche intérieure non conductrice entourée d'une matière conductrice. Le rapport entre l'épaisseur de la couche non conductrice et l'épaisseur de la coque extérieure conductrice détermine la longueur d'onde d'absorbance maximale ou de diffusion de la particule. Des procédés uniques en phase de solution de synthèse des particules consistent à lier des grappes d'atomes, ions ou molécules conducteurs à la couche intérieure non conductrice par des molécules linéaires. Cette étape peut être suivie d'une croissance du métal sur les grappes pour former une coque conductrice cohérente enfermant le noyau.

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