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AbstractAbstract
[en] In this article we shall briefly describe how results obtained from the experimental analysis of the structure of membranes can be used on the one hand for determining this structure and on the other hand as a result for example of the detection of too many large pores or micro fissures and the existence of leaks at the joints, for eliminating membranes which can not be used industrially. Here we shall only consider the utilisation of information given by measurement of the specific permeability G0, the pore radius for the molecular (diffusion) regime rmol., the pore radius for the viscous diffusion regime the pore radius for the intermediate stage of diffusion, rwicke, the pore radius rsep. which is used for determining the actual separation, the distribution of the pore radius defined by mercury symmetry, the B.E.T. and central X ray diffusion. First of all we shall give the definition which is adopted in practice for these empirical values, which can be adapted for a rapid analysis of the quality of membranes by comparing them with the same measurements carried out on standard porous samples. In a second section we show in a few cases which have occurred in routine measurement how by comparison it is possible to eliminate membranes which do not have a suitable structure. (author)
[fr]
Dans cet expose, nous allons montrer sommairement comment les resultats donnes par les methodes experimentales de controle de la structure des barrieres peuvent, d'une part, conduire a une certaine representation de cette structure et, d'autre part, permettre d'eliminer les barrieres non utilisables industriellement en detectant par exemple les trop nombreux gros pores ou microfissures et l'existence de fuites aux joints. Nous nous limiterons ici a l'exploitation des renseignements donnes par la permeabilite specifique G0, le rayon de pore rmol. effectif en regime moleculaire, le rayon de pore rvisq. effectif en regime visqueux, le rayon de pore rwicke effectif en regime intermediaire, le rayon de pore rsep. effectif en separation et les repartitions de rayons de pore definies par la porosimetrie au mercure, le B.E.T. et la diffusion centrale des rayons X. Nous donnerons d'abord la definition adoptee en pratique pour ces grandeurs empiriques, adaptees a un controle rapide des qualites des barrieres, en les reliant aux proprietes caracteristiques de quelques modeles de structure poreuse. Dans une seconde partie, nous montrerons sur quelques exemples empruntes aux mesures de routine, comment elles permettent, par recoupement, d'ecarter les barrieres a structure defavorable. (auteur)Original Title
Caracteristiques des barrieres utilisables pour la separation isotopique par diffusion gazeuse
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Secondary Subject
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1958; 21 p; 17 refs.
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Report
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ALUMINIUM OXIDES, COMPARATIVE EVALUATIONS, DIFFUSION BARRIERS, EFFICIENCY, GASEOUS DIFFUSION PROCESS, KNUDSEN FLOW, LAMINAR FLOW, PERMEABILITY, PORE STRUCTURE, POROSIMETERS, POROSITY, POROUS MATERIALS, SINTERED MATERIALS, SPATIAL DISTRIBUTION, SPECIFIC SURFACE AREA, STRUCTURAL CHEMICAL ANALYSIS, TEFLON
ALUMINIUM COMPOUNDS, CHALCOGENIDES, DISTRIBUTION, EVALUATION, FLUID FLOW, FLUORINATED ALIPHATIC HYDROCARBONS, GAS FLOW, HALOGENATED ALIPHATIC HYDROCARBONS, ISOTOPE SEPARATION, MATERIALS, MEASURING INSTRUMENTS, MICROSTRUCTURE, ORGANIC COMPOUNDS, ORGANIC FLUORINE COMPOUNDS, ORGANIC HALOGEN COMPOUNDS, ORGANIC POLYMERS, OXIDES, OXYGEN COMPOUNDS, PETROCHEMICALS, PETROLEUM PRODUCTS, PHYSICAL PROPERTIES, PLASTICS, POLYETHYLENES, POLYMERS, POLYOLEFINS, POLYTETRAFLUOROETHYLENE, SEPARATION PROCESSES, SYNTHETIC MATERIALS
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