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Author: Amane Jada
Publisher:
ISBN:
Category :
Languages : fr
Pages : 157
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Book Description
ETUDE DES MICROEMULSIONS QUI SONT DES SOLUTIONS TRANSPARENTES CONSTITUEES DE FINES GOUTTELETTES D'EAU DISPERSEES DANS UNE PHASE CONTINUE RICHE EN HUILE. DETERMINATION PAR DECLIN DE FLUORESCENCE, DIFFUSION DE LUMIERE ET CONDUCTIVITE ELECTRIQUE DE L'INFLUENCE DE LA NATURE DE L'HUILE, DE LA TEMPERATURE ET DE LA STRUCTURE DU TENSIOACTIF SUR LA TAILLE DES GOUTTELETTES ET LES PROCESSUS D'ECHANGE DE MATIERE ENTRE GOUTTELETTES
Author: Amane Jada
Publisher:
ISBN:
Category :
Languages : fr
Pages : 157
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Book Description
ETUDE DES MICROEMULSIONS QUI SONT DES SOLUTIONS TRANSPARENTES CONSTITUEES DE FINES GOUTTELETTES D'EAU DISPERSEES DANS UNE PHASE CONTINUE RICHE EN HUILE. DETERMINATION PAR DECLIN DE FLUORESCENCE, DIFFUSION DE LUMIERE ET CONDUCTIVITE ELECTRIQUE DE L'INFLUENCE DE LA NATURE DE L'HUILE, DE LA TEMPERATURE ET DE LA STRUCTURE DU TENSIOACTIF SUR LA TAILLE DES GOUTTELETTES ET LES PROCESSUS D'ECHANGE DE MATIERE ENTRE GOUTTELETTES
Author: NOUREDDINE.. LALEM
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Book Description
NOUS AVONS ETUDIE L'EFFET DU COTENSIOACTIF, DU TENSIOACTIF ET DE LA CONCENTRATION EN GLYCEROL DANS LE CUR AQUEUX DE MICELLES INVERSES SUR LA STRUCTURE ET LA DYNAMIQUE DE MICROEMULSIONS EAU DANS HUILE EN UTILISANT LES METHODES DE CONDUCTIVITE ELECTRIQUE ET DE DECLIN DE FLUORESCENCE RESOLUE DANS LE TEMPS. LA TAILLE DES MICELLES INVERSES ET LES INTERACTIONS ATTRACTIVES ENTRE MICELLES AUGMENTENT LORSQUE LA LONGUEUR DE LA MOLECULE DU COTENSIOACTIF OU DU TENSIOACTIF DIMINUE. AVEC UN COTENSIOACTIF COURT, LA SOLUBILITE DE L'EAU EST LIMITEE PAR LES INTERACTIONS ATTRACTIVES ENTRE MICELLES, LE PHENOMENE DE PERCOLATION ELECTRIQUE APPARAIT ET LA VALEUR DE LA CONSTANTE DE VITESSE D'ECHANGE DE MATIERE ENTRE MICELLES K#E EST EGALE A (1-2)10#9 M##1S##1 AU SEUIL DE PERCOLATION ELECTRIQUE. AVEC UN CONTENSIOACTIF LONG; LA SOLUBILITE DE L'EAU EST LIMITEE PAR LE RAYON DE COURBURE SPONTANE DU FILM INTERFACIAL A LA SURFACE DES MICELLES, LE PHENOMENE DE PERCOLATION ELECTRIQUE N'APPARAIT PAS ET LA VALEUR DE K#E EST INFERIEURE A 10#9 M##1S##1. DES CORRELATIONS ONT ETE ETABLIES QUI PERMETTENT DE FAIRE DES PREVISIONS SUR L'EVOLUTION ET LA TAILLE DES MICELLES ET LES INTERACTIONS ATTRACTIVES ENTRE MICELLES LORSQUE LA LONGUEUR DE LA CHAINE ALKYLE DU CONTENSIOACTIF OU DU TENSIOACTIF VARIE. LA TAILLE DES MICELLES EST INDEPENDANTE DE LA CONCENTRATION EN GLYCEROL ET LES INTERACTIONS ATTRACTIVES ENTRE MICELLES AUGMENTENT AVEC LE CONTENU EN GLYCEROL DANS LE CUR DES MICELLES
Author: Ulrike Peter
Publisher:
ISBN:
Category :
Languages : en
Pages : 171
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Book Description
@Les microémulsions sont des phases de films flexibles de tensioactifs à l'interface entre l'eau et l'huile. Leur stabilité est déterminée par une compétition entre l'entropie du système et l'énergie élastique du film interfacial. Dans les systèmes de microémulsions classiquement étudiés, la constante élastique K de courbure du film est de l'ordre de kBT. Nous nous intéressons à un système contenant des interfaces plus rigides. Toutefois, l'interface est choisie telle que K reste suffisamment faible (de l'ordre de 2-4 kBT) pour que les fluctuations thermiques du système jouent encore un rôle important. Dans le présent travail, nous étudions le diagramme de phases du système eau/NaCL/décane/SDS/octanol. Dans ce diagramme particulièrement riche on trouve, outre des phases microémulsion extrêmement diluées, des phases présentant un ordre à longue distance (hexagonal, tétragonal, cubique ou mésophases intermédiaires) dont la taille caractéristique atteint 2000-3000 Å. Nos études, essentiellement menées par diffusion de rayonnement (rayons X et lumière), nous apportent des informations sur la symétrie de ces phases, la nature des transitions et le rôle du cosurfactant et de la température. Par ailleurs, l'étude par diffusion dynamique de la lumière des phases microémulsion met en évidence un nouveau mode de relaxation diffusif, que nous interprétons comme un mode de relaxation topologique lié à des processus de fusion du film. Nous soulignons le rôle de la courbure spontanée dans (interprétation de nos résultats.
Author: Maurice Bourrel
Publisher: Editions TECHNIP
ISBN: 9782710809562
Category : Emulsions
Languages : en
Pages : 416
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Book Description
Beginning with P.A. Winsor's fundamental hypothesis on a natural interfacial curvature depending on the values of the formulation variables, this unique book shows scientists how to understand the intrinsic structure of these complex systems and their corresponding physical properties... predict how a change in one formulation variable (surfactant structure, oil structure, aqueous phase composition, temperature, etc.) will modify the microemulsion... and systematically formulate microemulsions for individual applications.This book provides a thermodynamic analysis supporting the existence of natural interfacial curvature... compares the behavior of commercial surfactant mixtures and pure isomeric surfactant molecules in order to point out differences and similarities highly significant for various uses... explains how micelles can evolve smoothly and continuously toward solutions containing large quantities of oil and water... gives procedures for fixing quantitative relationships among formulation variables... plus much more.Illustrated with more than 200 diagrams, tables, and photographs, and completely referenced, this superb volume is essential reading for surfactant, colloid, and physical chemists in both academe and industry, as well as chemical engineers, biotechnologists, and petroleum engineers.Contents: 1. The R-Ratio. 2. Aqueous solutions containing amphiphiles. 3. Nonpolar solutions containing amphiphiles. 4. The phase behavior and properties of solutions containing amphiphiles, organic liquids, and water: micellar solutions. 5. Methods for promoting phase changes. 6. Compensating changes between formulation variables. 7. Solubilization. 8. Thermodynamics of solubilized systems.
Author: PAUL-HENRI.. GUERING
Publisher:
ISBN:
Category :
Languages : fr
Pages : 171
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Book Description
SUIVANT LES TENEURS EN PHASE DISPERSEE, LES SYSTEMES SONT ETUDIES SOIT PAR DIFFUSION DE LUMIERE, SOIT PAR DES MESURES DE CONDUCTIVITE ELECTRIQUE. LES MESURES D'EFFET KERR (STATIQUE ET DYNAMIQUE) PERMETTENT D'ANALYSER LE PROCESSUS D'AGREGATION TRANSITOIRE DES GOUTTELETTES, A UNE ECHELLE MICROSCOPIQUE. ET ENFIN, A UNE ECHELLE MOLECULAIRE EN R.M.N., LES MESURES DES COEFFICIENTS D'AUTODIFFUSION, TESTENT LES ECHANGES DE CONSTITUANTS LORS DE CHOCS ENTRE GOUTTELETTES. D'AUTRE PART, L'ETUDE D'UN SYSTEME OU L'ON PASSE D'UNE MICROEMULSION EAU DANS L'HUILE A HUILE DANS EAU, MONTRE QUE DANS LA SITUATION INTERMEDIAIRE LA STRUCTURE EST BICONTINUE
Author: Friberg
Publisher: CRC Press
ISBN: 1351091492
Category : Science
Languages : en
Pages : 387
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Book Description
This book describes the microemulsion phenomenon in a systematic manner and not only provides an up-to-date introduction to this topic but aslo serves as the basis for further development in the area.The progress of microemulsion research has taken place in well-defined stages. The introduction period was founded on Schulman‘s original discovery and was, as expected, focused on the interfacial free energy. Because Schulman obtained his microemulsions from a macroemulsion by the addition of a cosurfactant.The present stage is characterized by an extensively enhanced knowledge about structure and dynamics in these systems. This has led to the realization that the structure of the microemulsions is related both to solutions with critical behaviour and long range order structures, the lyotropic liquid crystals. These two aspects have been elucidated independently by the French groups and by the Lund Spectroscopy group.
Author: Friberg
Publisher: CRC Press
ISBN: 135108304X
Category : Science
Languages : en
Pages : 225
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Book Description
This book describes the microemulsion phenomenon in a systematic manner and not only provides an up-to-date introduction to this topic but aslo serves as the basis for further development in the area.The progress of microemulsion research has taken place in well-defined stages. The introduction period was founded on Schulman‘s original discovery and was, as expected, focused on the interfacial free energy. Because Schulman obtained his microemulsions from a macroemulsion by the addition of a cosurfactant.The present stage is characterized by an extensively enhanced knowledge about structure and dynamics in these systems. This has led to the realization that the structure of the microemulsions is related both to solutions with critical behaviour and long range order structures, the lyotropic liquid crystals. These two aspects have been elucidated independently by the French groups and by the Lund Spectroscopy group.
Author: Dominique Langevin
Publisher: Springer Nature
ISBN: 3030556816
Category : Science
Languages : en
Pages : 354
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Book Description
This book takes an interface science approach to describe and understand the behavior of the dispersions we call emulsions, microemulsions and foams. The one thing all these dispersions have in common is the presence of surface-active species (surfactants) adsorbed at the interfaces between the two fluid phases that make up the emulsions, microemulsions or foams. The interfacial layers formed by the surfactants control most of the properties of the dispersions. The book describes the properties of interfacial layers, thin films and bulk fluids used in the elaboration of the various dispersions and it explains how such properties relate to the dispersion properties of these soft matter systems: structure, rheology and stability. These dispersion properties are far from being fully understood, in particular foam and emulsion stability. In discussing the state of the art of the current knowledge, the author draws interesting parallels between emulsions, microemulsions and foams that enlighten the interpretation of previous observations and point to a deeper understanding of the behavior of these materials in the future.
Author: S. Martellucci
Publisher: Springer Science & Business Media
ISBN: 1489908099
Category : Science
Languages : en
Pages : 283
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Book Description
The current state of the art of various aspects of micro emulsion systems is reflected in this volume. Major topics discussed include: general background on solubilized systems, phase diagrams and phase equi libria, bicontinuous microemulsions, Winsor's phases, theories and models of complex self association structures, cry tical behaviour, phase tran sitions in lyotropic liquid crystals. I hope that this book will serve its intended objective of reflecting our current understanding of microemulsions both in theory and practice, and that it will be useful to researchers, both novices as well as experts, as a valuable reference source. I feel indebted to the people of the Ettore Majorana Centre: the friendly atmosphere of the Erice centre provided a very effective environ ment to enjoy the company of colleagues and friends during breaks and after sessions, and to discuss problems of mutual interest. The courtesy, efficiency and devotion of the secretarial and technical staff was also appreciated, and greatly contributed to make the Workshop a smoothly run ning one. The Scientific Secretary Donatella Senatra Department of Physics University of Florence (Italy) v INTRODUCTION The decision to publish. in a more permanent form than heretofore. the Proceedings of the Workshop on "Progress in Microemulsion" of the Inter national School of Quantum Electronics. which was held in Erice (Italy) from October 26 to November 1st. 1985. under the auspices of the "Ettore Majorana" Centre for Scientific Culture. will prove to be a sound one.
Author: SYLVIE.. MICHON BRUNETTI
Publisher:
ISBN:
Category :
Languages : fr
Pages : 107
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Book Description
