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CONCENTRATION POLARIZATION [3 records]
Record 1 - internal organization data 2010-12-23
Record 1, English
Record 1, Subject field(s)
- Biological Sciences
Record 1, Main entry term, English
- concentration polarization
1, record 1, English, concentration%20polarization
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
- concentration polarisation 2, record 1, English, concentration%20polarisation
correct
- membrane polarization 2, record 1, English, membrane%20polarization
correct
- polarization 3, record 1, English, polarization
Record 1, Textual support, English
Record number: 1, Textual support number: 1 DEF
Phenomenon which arises as a result of the build-up of a layer of rejected solute at the membrane surface which impedes solvent flow. The resistance to flow due to this layer thus increases until a point is reached where the rate of diffusion of solute away from the polarization layer equals the rate of deposition. This phenomenon also explains why the solvent flux often becomes invariant with an increasing transmembrane pressure drop. Although solvent flux through a membrane is a hydraulic pressure-activated process and should increase with increasing pressure, a point is reached where the rate of build-up of the solute polarization layer is such that flow is impeded and further increases in pressure have no effect. 2, record 1, English, - concentration%20polarization
Record number: 1, Textual support number: 1 CONT
Concentration is the only important application with regard to initial enzyme recovery. Coarse fractionation is rarely attempted on a large scale, mainly because concentration polarisation ... occurs during ultra-filtration, effectively preventing an adequate separation. Equally, removal of salts and low molecular weight species alone is not the prime consideration, although ultrafiltration is commonly used to this end later in enzyme purification processes. 4, record 1, English, - concentration%20polarization
Record 1, French
Record 1, Domaine(s)
- Sciences biologiques
Record 1, Main entry term, French
- polarisation
1, record 1, French, polarisation
correct, feminine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
Record 1, Textual support, French
Record number: 1, Textual support number: 1 CONT
Grâce à leurs propriétés plastiques, les supports membranaires peuvent équiper des réacteurs de conceptions technologiques très diverses. Dans certains cas, la membrane constitue une simple barrière physique retenant les macromolécules dans le compartiment réactionnel : c'est le principe des membranes d'ultrafiltration utilisées pour récupérer le biocatalyseur dans les réacteurs agités. [...] Le principal inconvénient de cette technique est le phénomène de "polarisation" qui se traduit par une accumulation des composés de haut poids moléculaire sur la face amont de la membrane et un colmatage des pores. 2, record 1, French, - polarisation
Record 1, Spanish
Record 1, Campo(s) temático(s)
- Ciencias biológicas
Record 1, Main entry term, Spanish
- polarización
1, record 1, Spanish, polarizaci%C3%B3n
feminine noun
Record 1, Abbreviations, Spanish
Record 1, Synonyms, Spanish
Record 1, Textual support, Spanish
Record 2 - internal organization data 2005-05-25
Record 2, English
Record 2, Subject field(s)
- Industrial Techniques and Processes
- Food Industries
Record 2, Main entry term, English
- concentration polarisation 1, record 2, English, concentration%20polarisation
Record 2, Abbreviations, English
Record 2, Synonyms, English
Record 2, Textual support, English
Record number: 2, Textual support number: 1 CONT
Concentration polarization is the development of a concentration gradient across the boundary layer near the membrane surface. 1, record 2, English, - concentration%20polarisation
Record 2, Key term(s)
- concentration polarization
Record 2, French
Record 2, Domaine(s)
- Techniques industrielles
- Industrie de l'alimentation
Record 2, Main entry term, French
- polarisation de concentration
1, record 2, French, polarisation%20de%20concentration
correct, feminine noun
Record 2, Abbreviations, French
Record 2, Synonyms, French
- concentration par polarisation 1, record 2, French, concentration%20par%20polarisation
correct, feminine noun
- concentration de polarisation 1, record 2, French, concentration%20de%20polarisation
avoid, feminine noun
Record 2, Textual support, French
Record number: 2, Textual support number: 1 DEF
Phénomène qui se produit toujours quand on effectue une séparation de substances macromoléculaires, moléculaires ou ioniques par une membrane et qui conduit à la formation, au voisinage de la face amont de la membrane, d'une couche dans laquelle se crée un gradient de concentration (Norme AFNOR). 1, record 2, French, - polarisation%20de%20concentration
Record number: 2, Textual support number: 1 OBS
Dans certains cas, ce phénomène conduit à la formation d'un gel. 1, record 2, French, - polarisation%20de%20concentration
Record number: 2, Textual support number: 2 OBS
La polarisation de concentration crée une résistance supplémentaire au transfert de matière. Pour réduire ce phénomène, on peut modifier les caractéristiques hydrodynamiques de l'écoulement. 1, record 2, French, - polarisation%20de%20concentration
Record number: 2, Textual support number: 3 OBS
La polarisation de concentration représente aujourd'hui le frein principal en séparation membranaire. Elle peut conduire à une diminution considérable des performances des appareils (osmose inverse, ultrafiltration et microfiltration tangentielle) en diminuant le flux de perméat. 1, record 2, French, - polarisation%20de%20concentration
Record number: 2, Textual support number: 4 OBS
concentration de polarisation : Le terme «concentration de polarisation» est déconseillé. C'est une mauvaise traduction de l'anglais «concentration polarisation». 1, record 2, French, - polarisation%20de%20concentration
Record 2, Spanish
Record 2, Textual support, Spanish
Record 3 - internal organization data 2000-08-28
Record 3, English
Record 3, Subject field(s)
- Industrial Techniques and Processes
- Printed Circuits and Microelectronics
Record 3, Main entry term, English
- concentration polarization
1, record 3, English, concentration%20polarization
correct
Record 3, Abbreviations, English
Record 3, Synonyms, English
Record 3, Textual support, English
Record number: 3, Textual support number: 1 CONT
The phenomenon which causes solutes to concentrate at the filter's membrane surface forming a gel layer. The thickness of this gel layer will increase until its hydraulic resistance to solvent transport reduces the flux to an equilibrium value such that the convective transport of solutes on the surface equals the back diffusion from the surface. In single-pass operation the concentration of sulutes is low, so concentration polarization does not limit flux. 1, record 3, English, - concentration%20polarization
Record 3, Key term(s)
- concentration polarisation
Record 3, French
Record 3, Domaine(s)
- Techniques industrielles
- Circuits imprimés et micro-électronique
Record 3, Main entry term, French
- polarisation de concentration
1, record 3, French, polarisation%20de%20concentration
correct, feminine noun
Record 3, Abbreviations, French
Record 3, Synonyms, French
Record 3, Textual support, French
Record 3, Spanish
Record 3, Textual support, Spanish
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