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Title: Method for producing size selected particles

Abstract

The invention provides a system for preparing specific sized particles, the system comprising a continuous stir tank reactor adapted to receive reactants; a centrifugal dispenser positioned downstream from the reactor and in fluid communication with the reactor; a particle separator positioned downstream of the dispenser; and a solution stream return conduit positioned between the separator and the reactor. Also provided is a method for preparing specific sized particles, the method comprising introducing reagent into a continuous stir reaction tank and allowing the reagents to react to produce product liquor containing particles; contacting the liquor particles with a centrifugal force for a time sufficient to generate particles of a predetermined size and morphology; and returning unused reagents and particles of a non-predetermined size to the tank.

Inventors:
; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1325824
Patent Number(s):
9,446,967
Application Number:
14/265,638
Assignee:
UCHICAGO ARGONNE, LLC (Chicago, IL) ANL
DOE Contract Number:
AC02-06CH11357
Resource Type:
Patent
Resource Relation:
Patent File Date: 2014 Apr 30
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE

Citation Formats

Krumdick, Gregory K., Shin, Young Ho, and Takeya, Kaname. Method for producing size selected particles. United States: N. p., 2016. Web.
Krumdick, Gregory K., Shin, Young Ho, & Takeya, Kaname. Method for producing size selected particles. United States.
Krumdick, Gregory K., Shin, Young Ho, and Takeya, Kaname. 2016. "Method for producing size selected particles". United States. doi:. https://www.osti.gov/servlets/purl/1325824.
@article{osti_1325824,
title = {Method for producing size selected particles},
author = {Krumdick, Gregory K. and Shin, Young Ho and Takeya, Kaname},
abstractNote = {The invention provides a system for preparing specific sized particles, the system comprising a continuous stir tank reactor adapted to receive reactants; a centrifugal dispenser positioned downstream from the reactor and in fluid communication with the reactor; a particle separator positioned downstream of the dispenser; and a solution stream return conduit positioned between the separator and the reactor. Also provided is a method for preparing specific sized particles, the method comprising introducing reagent into a continuous stir reaction tank and allowing the reagents to react to produce product liquor containing particles; contacting the liquor particles with a centrifugal force for a time sufficient to generate particles of a predetermined size and morphology; and returning unused reagents and particles of a non-predetermined size to the tank.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 9
}

Patent:

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  • A method for producing hollow spherical particles is described consisting of a material, from a hollow rod that also consists of the material. The method includes the steps of: internally pressurizing the rod; introducing an end of the pressurized rod into a focused beam of laser light having sufficient power to melt the material at the end of the pressurized rod; and vibrating the end of the pressurized rod to produce hollow spherical particles from the melted material.
  • A vibrating nozzle produces a stream of drops of a nitrate solution that attain spherical drop shape before entering an ammonia gas phase where gas supply nozzles direct streams of ammonia gas obliquely against the drop stream with a component of motion in the direction of movement of the droplet stream, the incidence of the gas streams on the droplet stream being offset a few millimeters from each other along the path of the droplet stream. The flow of gas is at a speed 10 to 20 times that of the velocity of the drops of solution that are uniformlymore » hardened on the surface in their spherical shape so that there is no deformation upon entering the aqueous solution of ammonia in the lower part of the container that confines the ammonia gas phase. The ammonia solution completes the conversion of the nitrate to the corresponding oxide, producing highly uniform spheres such as are required for subsequent sintering in the production of nuclear fuel or breeder elements.« less
  • A method is provided for producing commercially large quantities of high melting temperature solid or hollow spherical particles of a predetermined chemical composition and having a uniform and controlled size distribution. An end (18, 50, 90) of a solid or hollow rod (20, 48, 88) of the material is rendered molten by a laser beam (14, 44, 82). Because of this, there is no possibility of the molten rod material becoming contaminated with extraneous material. In various aspects of the invention, an electric field is applied to the molten rod end (18, 90), and/or the molten rod end (50, 90)more » is vibrated. In a further aspect of the invention, a high-frequency component is added to the electric field applied to the molten end of the rod (90). By controlling the internal pressure of the rod, the rate at which the rod is introduced into the laser beam, the environment of the process, the vibration amplitude and frequency of the molten rod end, the electric field intensity applied to the molten rod end, and the frequency and intensity of the component added to the electric field, the uniformity and size distribution of the solid or hollow spherical particles (122) produced by the inventive method is controlled. The polarity of the electric field applied to the molten rod end can be chosen to eliminate backstreaming electrons, which tend to produce run-away heating in the rod, from the process.« less
  • Submicron size particles are produced by using a sputtering process to deposit particles into a liquid. The liquid is processed to recover the particles therefrom, and the particles have sizes in the range of twenty to two hundred Angstroms. Either metallic or non-metallic particles can be produced, and the metallic particles can be used in "metallic inks".
  • Submicron size particles are produced by using a sputtering process to deposit particles into a liquid. The liquid is processed to recover the particles therefrom, and the particles have sizes in the range of twenty to two hundred Angstroms. Either metallic or non-metallic particles can be produced, and the metallic particles can be used in ''metallic inks.'' 4 figs.