Method for producing metal oxide nanocrystals, method for producing multi-element oxide nanocrystals, and metal oxide nanocrystals

Patent metadata

Field	Value
Publication number	US-10745822-B2
Application number	US-201615747095-A
Country	US
Kind code	B2
Filing date	Jul 22, 2016
Priority date	Jul 23, 2015
Publication date	Aug 18, 2020
Grant date	Aug 18, 2020

Abstract

A method for producing metal oxide nanocrystals, according to the embodiment of the present invention, includes: continuously flowing, into a continuous flow path, one or a plurality of nanocrystal precursor solutions each comprising one or more nanocrystal precursors dissolved in a non-polar solvent; directing a segmenting gas into the continuous flow path to create a segmented reaction flow; flowing the segmented reaction flow into a thermal processor; heating the segmented reaction flow in the thermal processor to create a product flow; and collecting metal oxide nanocrystals from the product flow.

First claim

The invention claimed is:

1. A method for producing metal oxide nanocrystals, comprising:
continuously flowing, into a continuous flow path, one or a plurality of nanocrystal precursor solutions each comprising one or more nanocrystal precursors dissolved in a non-polar solvent;
directing a segmenting gas into the continuous flow path to create a segmented reaction flow;
flowing the segmented reaction flow into a thermal processor;
heating the segmented reaction flow in the thermal processor to create a product flow; and
collecting metal oxide nanocrystals from the product flow,
wherein the collecting of the metal oxide nanocrystals comprises:
flowing the product flow to a ligand exchange reactor coupled within the continuous flow path;
exchanging a first coordinating ligand for a second coordinating ligand in the ligand exchange reactor; and
collecting metal oxide nanocrystals chemically bound to the second coordinating ligand.

2. A method for producing metal oxide nanocrystals, comprising:
continuously flowing, into a continuous flow path, one or a plurality of nanocrystal precursor solutions each comprising one or more nanocrystal precursors dissolved in a non-polar solvent; wherein the nanocrystal precursor solutions are prepared by mixing one or more metal salts comprising a polyatomic anion that includes one or more oxygen atoms with the non-polar solvent and a first coordinating ligand that is soluble in the non-polar solvent;
directing a segmenting gas into the continuous flow path to create a segmented reaction flow;
flowing the segmented reaction flow into a thermal processor;
heating the segmented reaction flow in the thermal processor to create a product flow; and
collecting metal oxide nanocrystals from the product flow,
wherein the collecting of the metal oxide nanocrystals comprises:
flowing the product flow to a ligand exchange reactor coupled within the continuous flow path;
exchanging the first coordinating ligand for a second coordinating ligand in the ligand exchange reactor; and
collecting metal oxide nanocrystals chemically bound to the second coordinating ligand.

Assignees

• Shoei Chemical Ind Co

Inventors

• Novet Thomas E
• Okawa Yukihisa
• Igari Masahito
• Schut David M

Classifications

• B01F33/30

  Micromixers · CPC title

• C01P2004/52

  highly monodisperse size distribution · CPC title

• C01G19/00 Primary

  Compounds of tin · CPC title

• C01B13/14

  Methods for preparing oxides or hydroxides in general (particular individual oxides or hydroxides, see the relevant groups of subclasses C01B - C01G or C25B, according to the element combined with the oxygen or hydroxy group) · CPC title

• B01J2219/00761

  Details of the reactor · CPC title