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Contribution to the study of the production and properties of finely divided solids, prepared in a flame reactor (1960); Contribution a l'etude de procedes d'obtention et des proprietes des solides finement divises elabores dans un reacteur a flamme (1960)

Abstract

Sufficiently fine particles cannot be obtained by the grinding of crystals. It is therefore logical to adopt a method whereby the solid is formed from a compound in the vapour phase notable amongst such compounds, volatile at moderate temperatures, are certain organic derivatives of metals and the metallic halides. Formation of the solid from its gaseous derivative should be possible by hydrolysis or oxidation without the dispersion of the reaction medium being modified. The simplest method seems to be to obtain the reaction in an oxy-hydrogen blow-pipe. When the gases in the blow-pipe contain a volatile metallic compound, precipitation of finely divided solid in the form of oxide is produced in the flame at high temperature. Aluminium, titanium, iron and zirconium oxides and silica, the particles of which are spherical and very homogeneous in diameter, have been prepared in this way. The specific surfaces calculated from the diameters on electron microscope photographs are in agreement with those measured by adsorption of nitrogen at 195 deg. C. The oxides thus prepared are therefore not intensely porous. The properties and size of the oxide particles are studied as a function of various operational parameters, such as flame temperature and concentration of volatile  More>>
Authors:
Cuer, J P [1] 
  1. Commissariat a l'Energie Atomique, Saclay (France). Centre d'Etudes Nucleaires
Publication Date:
Apr 15, 1960
Product Type:
Thesis/Dissertation
Report Number:
CEA-R-1669
Resource Relation:
Other Information: TH: These ES sciences; 77 refs
Subject:
36 MATERIALS SCIENCE; AEROSOLS; ALUMINIUM CHLORIDES; ALUMINIUM OXIDES; CHEMICAL PREPARATION; COMBUSTION PROPERTIES; CRYSTAL STRUCTURE; FLAMES; FUEL-AIR RATIO; IRON OXIDES; PARTIAL PRESSURE; PARTICLE SIZE; POWDERS; PYROLYSIS; REACTION HEAT; SILICA; SPECIFIC SURFACE AREA; SPHERICAL CONFIGURATION; TEMPERATURE RANGE 1000-4000 K; TEXTURE; TITANIUM OXIDES; VAPOR PRESSURE; X-RAY DIFFRACTION; ZIRCONIUM OXIDES
OSTI ID:
20953759
Research Organizations:
CEA Saclay, 91 - Gif-sur-Yvette (France); Faculte des Sciences de l'Universite de Lyon, 69 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR07R1669105040
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
86 pages
Announcement Date:
Dec 21, 2007

Citation Formats

Cuer, J P. Contribution to the study of the production and properties of finely divided solids, prepared in a flame reactor (1960); Contribution a l'etude de procedes d'obtention et des proprietes des solides finement divises elabores dans un reacteur a flamme (1960). France: N. p., 1960. Web.
Cuer, J P. Contribution to the study of the production and properties of finely divided solids, prepared in a flame reactor (1960); Contribution a l'etude de procedes d'obtention et des proprietes des solides finement divises elabores dans un reacteur a flamme (1960). France.
Cuer, J P. 1960. "Contribution to the study of the production and properties of finely divided solids, prepared in a flame reactor (1960); Contribution a l'etude de procedes d'obtention et des proprietes des solides finement divises elabores dans un reacteur a flamme (1960)." France.
@misc{etde_20953759,
title = {Contribution to the study of the production and properties of finely divided solids, prepared in a flame reactor (1960); Contribution a l'etude de procedes d'obtention et des proprietes des solides finement divises elabores dans un reacteur a flamme (1960)}
author = {Cuer, J P}
abstractNote = {Sufficiently fine particles cannot be obtained by the grinding of crystals. It is therefore logical to adopt a method whereby the solid is formed from a compound in the vapour phase notable amongst such compounds, volatile at moderate temperatures, are certain organic derivatives of metals and the metallic halides. Formation of the solid from its gaseous derivative should be possible by hydrolysis or oxidation without the dispersion of the reaction medium being modified. The simplest method seems to be to obtain the reaction in an oxy-hydrogen blow-pipe. When the gases in the blow-pipe contain a volatile metallic compound, precipitation of finely divided solid in the form of oxide is produced in the flame at high temperature. Aluminium, titanium, iron and zirconium oxides and silica, the particles of which are spherical and very homogeneous in diameter, have been prepared in this way. The specific surfaces calculated from the diameters on electron microscope photographs are in agreement with those measured by adsorption of nitrogen at 195 deg. C. The oxides thus prepared are therefore not intensely porous. The properties and size of the oxide particles are studied as a function of various operational parameters, such as flame temperature and concentration of volatile metal derivative in the reactive gases. When the blow-pipe is supplied with oxide particles of small diameter, a very marked increase in size is observed. The properties of these preparations are also examined. (author) [French] Les procedes de broyage des cristaux ne conduisent pas a des particules suffisamment fines. Aussi, il est logique de s'adresser a un procede de formation du solide a partir d'un compose se trouvant en phase vapeur. De tels composes, volatils a des temperatures moderees, sont notamment certains derives organiques des metaux et les halogenures metalliques. La formation du solide a partir de son derive gazeux doit pouvoir etre effectuee par l'hydrolyse ou l'oxydation, sans que la dispersion du milieu reactionnel soit modifiee. Le procede le plus aise a realiser semble etre la reaction dans un chalumeau oxhydrique. Lorsque les gaz du chalumeau contiennent un compose metallique volatil, il se produit dans la flamme a haute temperature une precipitation du solide finement divise sous forme d'oxyde. Des oxydes d'aluminium, de titane, de fer, de zirconium et de la silice dont les particules, de diametre tres homogene, ont la forme spherique, ont ete ainsi prepares. Les surfaces specifiques calculees a partir des diametres sur les photographies au microscope electronique sont en accord avec celles mesurees par l'adsorption d'azote a 195 deg. C. Les oxydes ainsi prepares ne possedent donc pas de porosite intense. Les proprietes et la taille des particules d'oxydes sont etudiees en fonction de differents parametres de fonctionnement du chalumeau, tels que temperature de la flamme et concentration en derive metallique volatil dans les gaz reactifs. Lorsque le chalumeau est alimente en particules d'oxydes de faible diametre, un tres net grossissement de celles-ci est observe. Les proprietes de ces preparations sont egalement examinees. (auteur)}
place = {France}
year = {1960}
month = {Apr}
}