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1. WO2006001018 - A METHOD FOR PRODUCING IRON OXIDE NANO PARTICLES

Publication Number WO/2006/001018
Publication Date 05.01.2006
International Application No. PCT/IL2005/000683
International Filing Date 27.06.2005
IPC
C01G 49/08 2006.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
GCOMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F94
49Compounds of iron
02Oxides; Hydroxides
08Ferroso-ferric oxide
C09C 1/24 2006.01
CCHEMISTRY; METALLURGY
09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
CTREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES; PREPARATION OF CARBON BLACK
1Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
22Compounds of iron
24Oxides of iron
C01G 49/06 2006.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
GCOMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F94
49Compounds of iron
02Oxides; Hydroxides
06Ferric oxide
C01G 49/02 2006.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
GCOMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F94
49Compounds of iron
02Oxides; Hydroxides
CPC
B82Y 30/00
BPERFORMING OPERATIONS; TRANSPORTING
82NANOTECHNOLOGY
YSPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
30Nanotechnology for materials or surface science, e.g. nanocomposites
C01G 49/02
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
GCOMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
49Compounds of iron
02Oxides; Hydroxides
C01G 49/06
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
GCOMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
49Compounds of iron
02Oxides; Hydroxides
06Ferric oxide (Fe2O3)
C01P 2002/04
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
2002Crystal-structural characteristics
04Compounds with a limited amount of crystallinty, e.g. as indicated by a crystallinity index
C01P 2004/12
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
2004Particle morphology
10extending in one dimension, e.g. needle-like
12with a cylindrical shape
C01P 2004/32
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
2004Particle morphology
30extending in three dimensions
32Spheres
Applicants
  • JOMA CHEMICAL AS [NO]/[NO] (AllExceptUS)
  • EYAL, Aharon [IL]/[IL] (UsOnly)
  • VITNER, Asher [IL]/[IL] (UsOnly)
Inventors
  • EYAL, Aharon
  • VITNER, Asher
Agents
  • WOLFF, BREGMAN AND GOLLER
Priority Data
16274227.06.2004IL
16722503.03.2005IL
16938423.06.2005IL
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) A METHOD FOR PRODUCING IRON OXIDE NANO PARTICLES
(FR) PROCEDE DESTINE A PRODUIRE DES NANOPARTICULES D'OXYDE DE FER
Abstract
(EN)
The invention provides a method for the formation of small-size iron oxide particles comprising the steps of preparing a starting aqueous solution comprising at least one of ferric ions and complexes thereof, at a concentration of at least 0.1% w/w iron and a pH greater than about 1.5; maintaining said solution at a temperature lower than 55°C for a retention time in which hydrolysis takes place, the extent of said hydrolysis being sufficient to decrease the pH by at least 0.2 units, wherein said time does not exceed 14 days, to form a system containing a modified solution; and adjusting the conditions in said system by at least one of the steps of heating the modified solution to elevate the temperature thereof by at least 10°C; elevating the pH of the modified solution by at least 0.3 units; and diluting the modified solution by at least 20%; whereby there are formed particles, wherein the majority of the particles formed are between about 2nm and about 500nm in size.
(FR)
L'invention concerne un procédé destiné à former des particules d'oxyde de fer de petite taille et consistant à préparer une solution de départ aqueuse renfermant des ions ferriques et/ou des complexes correspondants avec une concentration supérieure ou égale à 0,1% poids/poids de fer et un pH supérieur à environ 1,5, à maintenir cette solution à une température inférieure à 55°C pendant un temps de séjour dans lequel se produit une hydrolyse, l'effet de cette hydrolyse étant suffisant pour réduire le pH d'au moins 0,2 unités, cette période ne dépassant pas 14 jours, en vue de la formation d'un système contenant une solution modifiée, et à ajuster les conditions dans ce système au moyen d'au moins une opération choisie parmi le chauffage de la solution modifiée en vue d'en élever la température d'au moins 10°C, l'élévation du pH de la solution modifiée d'au moins 0,3 unités, et la dilution de la solution modifiée d'au moins 20%. On forme ainsi des particules dont la majorité présente une taille comprise entre environ 2 nm et environ 500 nm.
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