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Papers by Bruno Bernard-Michel

Research paper thumbnail of The study of calcium oxalate precipitation using image analysis

Chemical Engineering Journal, 1999

Image analysis is applied to study the precipitation of calcium oxalate in a semi-batch single- a... more Image analysis is applied to study the precipitation of calcium oxalate in a semi-batch single- and double-feed reactor. The feed consists in un-premixed potassium oxalate and calcium chloride solutions. The effect of various operating conditions and feeding strategies on the yield of calcium oxalate mono-, di-, and tri-hydrates, the degree of agglomeration, and the crystal size is studied by image

Research paper thumbnail of Quantification, by image analysis, of effect of operational conditions on size and shape of precipitated barium sulphate

The size and morphology of precipitated barium sulphate crystals have been quantified by semi-aut... more The size and morphology of precipitated barium sulphate crystals have been quantified by semi-automated image analysis. Using a set of six bi-dimensional shape descriptors and a pseudo-3D parameter and with the help of statistical tools such as principal component analysis and factorial discriminant analysis, it is possible to discriminate the various habits of barite, found in literature or obtained in our experiments under various operational conditions (single or double feed, feed injection position, feed rates) related to macro and micromixing. By examination of sets of at least 80 crystals per sample, the effect of these conditions on the shape and size of barite have been evaluated.

Research paper thumbnail of Particle morphology: from visualisation to measurement

Powder Technology, 1999

The main steps of characterisation of particle morphology by image analysis, i.e., visualisation,... more The main steps of characterisation of particle morphology by image analysis, i.e., visualisation, image treatment, shape quantification, for routine use in powder technology are reviewed and illustrated by examples. Macroscale and mesoscale bidimensional descriptors are presented, depending upon the desired level of detail. Elements for a quantification of the 3D shape are given, stressing out the special case of faceted

Research paper thumbnail of Caractérisation granulométrique et morphologique de particules cristallines : applications en cristallisation et en précipitation

Les proprietes d'usage des poudres, qui constituent un enjeu industriel particulierement impo... more Les proprietes d'usage des poudres, qui constituent un enjeu industriel particulierement important, dependent directement des caracteristiques (composition chimique, taille, morphologie,. . . ) de ces poudres; ces caracteristiques dependent elles meme du procede de fabrication mis en jeu qui implique le plus souvent une etape de cristallisation ou de precipitation. Un outil de quantification morphologique, base sur un jeu de six parametres morphologiques 2D et d'un parametre pseudo-3D, ainsi qu'un outil de classification automatique en groupes morphologiques base sur l'Analyse en Composantes Principales et l'Analyse Factorielle Discriminante, ont ete developpes et valides. Ils permettent de differencier la plupart des formes cristallines rencontrees et de quantifier certains phenomenes de cristallisation/precipitation (degre d'agglomeration, croissance directionnelle ou stratifiee, pourcentage d'agglomerats,. . . ). L'objectif ultime d'une quantif...

Research paper thumbnail of Classification of Crystal Shape Using Fourier Descriptors and Mathematical Morphology

Particle & Particle Systems Characterization

Research paper thumbnail of Imaging in powder technology from visualization to measurement: Application to shape quantification

The Canadian Journal of Chemical Engineering, 2000

ABSTRACT Image analysis tools and statistical procedures have been developed to quantify particle... more ABSTRACT Image analysis tools and statistical procedures have been developed to quantify particle shape. Three copper sulfate crystallization processes have been carried out and the effects of process operating parameters upon crystal morphology have been studied as well as the relationships between morphology and powder end use properties. Both aspects give the capability to master end-use properties by the process parameters. It is also shown that size distribution without morphology is deficient to globally characterize a powder and to describe its behaviour.Des outils d'analyse d'images et des procédures statistiques ont été développées pour quantifier la forme de particules. Trois precédés de cristallisation de sulfate de cuivre ont été mis en oeuvre et les effets des paramètres opératoires sur la morphologie de poudres ont été étudié ainsi que les liens entre la morphologie et quelques propriétés d'usage. Ces deux aspects donnent la possibilité de maîtriser les proprietes d'usage par les paramètres du precédé. On a aussi montré que la granulomére sans la morphologie ne suffit pas à caractériser complètement une poudre ni à décrire son comportement.

Research paper thumbnail of Quantification of Particle Morphology in Powder Process Technology

Microscopy Microanalysis Microstructures, 1996

Research paper thumbnail of The study of calcium oxalate precipitation using image analysis

Chemical Engineering Journal, 1999

Image analysis is applied to study the precipitation of calcium oxalate in a semi-batch single- a... more Image analysis is applied to study the precipitation of calcium oxalate in a semi-batch single- and double-feed reactor. The feed consists in un-premixed potassium oxalate and calcium chloride solutions. The effect of various operating conditions and feeding strategies on the yield of calcium oxalate mono-, di-, and tri-hydrates, the degree of agglomeration, and the crystal size is studied by image

Research paper thumbnail of Quantification, by image analysis, of effect of operational conditions on size and shape of precipitated barium sulphate

The size and morphology of precipitated barium sulphate crystals have been quantified by semi-aut... more The size and morphology of precipitated barium sulphate crystals have been quantified by semi-automated image analysis. Using a set of six bi-dimensional shape descriptors and a pseudo-3D parameter and with the help of statistical tools such as principal component analysis and factorial discriminant analysis, it is possible to discriminate the various habits of barite, found in literature or obtained in our experiments under various operational conditions (single or double feed, feed injection position, feed rates) related to macro and micromixing. By examination of sets of at least 80 crystals per sample, the effect of these conditions on the shape and size of barite have been evaluated.

Research paper thumbnail of Particle morphology: from visualisation to measurement

Powder Technology, 1999

The main steps of characterisation of particle morphology by image analysis, i.e., visualisation,... more The main steps of characterisation of particle morphology by image analysis, i.e., visualisation, image treatment, shape quantification, for routine use in powder technology are reviewed and illustrated by examples. Macroscale and mesoscale bidimensional descriptors are presented, depending upon the desired level of detail. Elements for a quantification of the 3D shape are given, stressing out the special case of faceted

Research paper thumbnail of Caractérisation granulométrique et morphologique de particules cristallines : applications en cristallisation et en précipitation

Les proprietes d'usage des poudres, qui constituent un enjeu industriel particulierement impo... more Les proprietes d'usage des poudres, qui constituent un enjeu industriel particulierement important, dependent directement des caracteristiques (composition chimique, taille, morphologie,. . . ) de ces poudres; ces caracteristiques dependent elles meme du procede de fabrication mis en jeu qui implique le plus souvent une etape de cristallisation ou de precipitation. Un outil de quantification morphologique, base sur un jeu de six parametres morphologiques 2D et d'un parametre pseudo-3D, ainsi qu'un outil de classification automatique en groupes morphologiques base sur l'Analyse en Composantes Principales et l'Analyse Factorielle Discriminante, ont ete developpes et valides. Ils permettent de differencier la plupart des formes cristallines rencontrees et de quantifier certains phenomenes de cristallisation/precipitation (degre d'agglomeration, croissance directionnelle ou stratifiee, pourcentage d'agglomerats,. . . ). L'objectif ultime d'une quantif...

Research paper thumbnail of Classification of Crystal Shape Using Fourier Descriptors and Mathematical Morphology

Particle & Particle Systems Characterization

Research paper thumbnail of Imaging in powder technology from visualization to measurement: Application to shape quantification

The Canadian Journal of Chemical Engineering, 2000

ABSTRACT Image analysis tools and statistical procedures have been developed to quantify particle... more ABSTRACT Image analysis tools and statistical procedures have been developed to quantify particle shape. Three copper sulfate crystallization processes have been carried out and the effects of process operating parameters upon crystal morphology have been studied as well as the relationships between morphology and powder end use properties. Both aspects give the capability to master end-use properties by the process parameters. It is also shown that size distribution without morphology is deficient to globally characterize a powder and to describe its behaviour.Des outils d'analyse d'images et des procédures statistiques ont été développées pour quantifier la forme de particules. Trois precédés de cristallisation de sulfate de cuivre ont été mis en oeuvre et les effets des paramètres opératoires sur la morphologie de poudres ont été étudié ainsi que les liens entre la morphologie et quelques propriétés d'usage. Ces deux aspects donnent la possibilité de maîtriser les proprietes d'usage par les paramètres du precédé. On a aussi montré que la granulomére sans la morphologie ne suffit pas à caractériser complètement une poudre ni à décrire son comportement.

Research paper thumbnail of Quantification of Particle Morphology in Powder Process Technology

Microscopy Microanalysis Microstructures, 1996