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Book Description
DANS UN PREMIER TEMPS, ON ETUDIE L'ADSORPTION DU TENSIOACTIF NON IONIQUE SEUL (UN OCTYLPHENOL POLYOXYETHYLENIQUE) SUR DES SILICES POREUSES OU COLLOIDALES. A PARTIR DE LA DETERMINATION DES ISOTHERMES D'ADSORPTION ET DES ENTHALPIES DE DEPLACEMENT, NOUS EN DEDUISONS LA FORMATION, SUR LA SURFACE, D'AGREGATS DONT LA STRUCTURE EST PROCHE DE CELLE DES MICELLES. ENSUITE, L'ETUDE DES MELANGES (CONSTITUES DU TENSIOACTIF NON IONIQUE PRECEDENT AVEC SOIT UN ALKYL SULFONATE SOIT UN ALKYLPYRIDINIUM) EST REALISEE EN DEUX ETAPES. D'UNE PART UNE ETUDE DES PROPRIETES DES SOLUTIONS AVEC NOTAMMENT LA DETERMINATION DES ENTHALPIES DE MICELLISATION EN FONCTION DE LA COMPOSITION NOUS PERMET DE CALCULER UN PARAMETRE D'INTERACTION ENTRE TENSIOACTIFS QUE L'ON PEUT COMPARER AUX MODELES COURANTS. LES RESULTATS OBTENUS MONTRENT UNE PART ENTHALPIQUE IMPORTANTE DANS LA STABILISATION DES MICELLES MIXTES QUE NOUS INTERPRETONS PAR LA REHYDRATATION DES MAILLONS OXYETHYLENIQUES. D'AUTRE PART, UNE ETUDE DE L'ADSORPTION MONTRE QUE, GRACE A LA FORMATION D'AGREGATS SUPERFICIELS MIXTES, L'ADSORPTION DU TENSIOACTIF ANIONIQUE SUR LA SILICE (IL NE S'ADSORBE PAS LORSQU'IL EST SEUL) EST RENDUE POSSIBLE MAIS AU DETRIMENT DE LA QUANTITE TOTALE ADSORBEE. PAR CONTRE, DANS LE CAS DU CATIONIQUE, ON OBSERVE UN NET ACCROISSEMENT DE LA QUANTITE TOTALE ADSORBEE PAR RAPPORT AUX COMPOSES SEULS. LA COMPARAISON DES AGREGATS SUPERFICIELS ET DES MICELLES, TANT AU NIVEAU DE LEUR COMPOSITION QU'A CELUI DES ENTHALPIES D'EXCES DE FORMATION DE CES DIFFERENTS AGREGATS, MONTRE QUE LES INTERACTIONS LATERALES PREDOMINENT DANS LE PROCESSUS D'ADSORPTION ET SONT SIMILAIRES A CELLES CONDUISANT A LA FORMATION DES MICELLES
Book Description
DANS UN PREMIER TEMPS, ON ETUDIE L'ADSORPTION DU TENSIOACTIF NON IONIQUE SEUL (UN OCTYLPHENOL POLYOXYETHYLENIQUE) SUR DES SILICES POREUSES OU COLLOIDALES. A PARTIR DE LA DETERMINATION DES ISOTHERMES D'ADSORPTION ET DES ENTHALPIES DE DEPLACEMENT, NOUS EN DEDUISONS LA FORMATION, SUR LA SURFACE, D'AGREGATS DONT LA STRUCTURE EST PROCHE DE CELLE DES MICELLES. ENSUITE, L'ETUDE DES MELANGES (CONSTITUES DU TENSIOACTIF NON IONIQUE PRECEDENT AVEC SOIT UN ALKYL SULFONATE SOIT UN ALKYLPYRIDINIUM) EST REALISEE EN DEUX ETAPES. D'UNE PART UNE ETUDE DES PROPRIETES DES SOLUTIONS AVEC NOTAMMENT LA DETERMINATION DES ENTHALPIES DE MICELLISATION EN FONCTION DE LA COMPOSITION NOUS PERMET DE CALCULER UN PARAMETRE D'INTERACTION ENTRE TENSIOACTIFS QUE L'ON PEUT COMPARER AUX MODELES COURANTS. LES RESULTATS OBTENUS MONTRENT UNE PART ENTHALPIQUE IMPORTANTE DANS LA STABILISATION DES MICELLES MIXTES QUE NOUS INTERPRETONS PAR LA REHYDRATATION DES MAILLONS OXYETHYLENIQUES. D'AUTRE PART, UNE ETUDE DE L'ADSORPTION MONTRE QUE, GRACE A LA FORMATION D'AGREGATS SUPERFICIELS MIXTES, L'ADSORPTION DU TENSIOACTIF ANIONIQUE SUR LA SILICE (IL NE S'ADSORBE PAS LORSQU'IL EST SEUL) EST RENDUE POSSIBLE MAIS AU DETRIMENT DE LA QUANTITE TOTALE ADSORBEE. PAR CONTRE, DANS LE CAS DU CATIONIQUE, ON OBSERVE UN NET ACCROISSEMENT DE LA QUANTITE TOTALE ADSORBEE PAR RAPPORT AUX COMPOSES SEULS. LA COMPARAISON DES AGREGATS SUPERFICIELS ET DES MICELLES, TANT AU NIVEAU DE LEUR COMPOSITION QU'A CELUI DES ENTHALPIES D'EXCES DE FORMATION DE CES DIFFERENTS AGREGATS, MONTRE QUE LES INTERACTIONS LATERALES PREDOMINENT DANS LE PROCESSUS D'ADSORPTION ET SONT SIMILAIRES A CELLES CONDUISANT A LA FORMATION DES MICELLES
Book Description
ETUDE DE L'ADSORPTION D'AGENTS DE SURFACE NON IONIQUES SUR LA SILICE (AMORPHE OU CRISTALLISEE) ET SUR LE KAOLIN AINSI QUE L'ADSORPTION D'AGENTS DE SURFACE IONIQUES SUR L'ALUMINE. ETUDE DE L'INFLUENCE DU PH ET DE LA TEMPERATURE SUR CE PHENOMENE
Book Description
CETTE ETUDE CONCERNE L'ADSORPTION DE MOLECULES TENSIOACTIVES A L'INTERFACE OXYDE MINERAL/SOLUTION AQUEUSE. LES SYSTEMES ETUDIES INCLUENT DIVERS TYPES DE SOLIDES TELS QUE QUARTZ, KAOLIN, ALUMINE, DIOXIDE DE TITANE EN PRESENCE DE TENSIOACTIFS CLASSIQUES (SDS, C#1#4TABR, TRITONS) ET AVEC DES TENSIOACTIFS MOINS ETUDIES DU TYPE ALKYLPOLYETHOXY SULFATE DE SODIUM. L'ADSORPTION A L'INTERFACE SOLIDE DIVISE/SOLUTION EST CARACTERISEE PAR LES METHODES SUIVANTES: DETERMINATIONS DES ISOTHERMES D'ADSORPTION (METHODE DES RESTES), MICROCALORIMETRIE DE DEPLACEMENT, ELECTROPHORESE DES PARTICULES. D'AUTRE PART, L'APPLICATION DE L'ELLIPSOMETRIE A L'ETUDE DE L'INTERFACE SURFACE PLANE SOLUTION A PERMIS DE: DETERMINER DE MANIERE DIRECTE LES ISOTHERMES D'ADSORPTION, AVOIR UNE INDICATION SUR L'EPAISSEUR DE LA PHASE ADSORBEE, EXAMINER IN SITU L'INFLUENCE DU PH. L'APPORT DE CE TRAVAIL SE SITUE A DEUX NIVEAUX. D'UNE PART, SUR LE PLAN EXPERIMENTAL NOUS METTONS EN EVIDENCE L'INTERET DE L'ELLIPSOMETRIE POUR L'ETUDE CINETIQUE, THERMODYNAMIQUE ET CONFORMATIONNELLE DE L'ADSORPTION A L'INTERFACE SOLIDE/LIQUIDE DE MOLECULES TENSIOACTIVES. D'AUTRE PART, EN CE QUI CONCERNE LES RESULTATS OBTENUS AVEC LES ALKYLPOLYETHOXY SULFATES DE SODIUM, NOUS MONTRONS LE ROLE PREDOMINANT DE LA FONCTION ANIONIQUE POUR RENDRE LA MOLECULE ADSORBABLE OU NON, ALORS QUE C'EST LA LONGUEUR DE LA CHAINE OXYETHYLENIQUE QUI SEMBLE CONTROLER LA STRUCTURE DES AGREGATS SUPERFICIELS
Author: P. Mavros Publisher: Springer Science & Business Media ISBN: 9401126585 Category : Science Languages : en Pages : 534
Book Description
The present book is the outcome of an Advanced Study Institute meeting, which was held in Kallithea, Chalkidiki, in Northern Greece, from 12-25 May 1991 and attended by 69 delegates from 18 countries. The Institute brought together scientists, engineers and technologists currently involved in basic and applied research on the different aspects of flotation. The Institute covered subjects in four major areas of flotation: a) fundamentals; b) chemical technology aspects; c) mineral processing; and d) water and wastewater treatment. Apart from the papers reproduced in this volume, several short oral communications were also presented. Participants also had the opportunity to visit the Hellenic Chemical Products & Fertilizers Co. Ltd. mixed sulphides plant, in Chalkidiki. Conference participants, whose interest and research projects are in this broad field of science and engineering, provided a well-informed discussion of the problems encountered, as well as possible directions of future technological developments. It is hoped that this book is not only a good record of the presentations made (formal and informal), analyzing the state-of-the-art in flotation, but will also be helpful for students, scientists and technologists working in the fields of separation processes and in particular mineral processing and wastewater engineering. All the invited speakers and the participants made this summer school possible, worthwhile and enjoyable. The sponsorship by the NATO Scientific Affairs Division is gratefully ack nowledged. The Editors would like to thank the members of the Organizing Committee, Dr. B.A.
Author: Wim Kok Publisher: Springer Science & Business Media ISBN: 3322831337 Category : Technology & Engineering Languages : en Pages : 89
Book Description
In this volume the general principles of capillary (zone) electrophoresis, the performance of this separation method to be expected, the instrumentation and techniques available and practical guidelines for the operaton of CE instruments will be discussed. The emphasis will be on the routine application of CE with commercially available instruments, but attention will also be paid to devolpments still in a research stage and their possible implications for the future.
Author: David J. Wronkiewicz Publisher: ISBN: Category : Technology & Engineering Languages : en Pages : 1370
Book Description
Safe and effective management of nuclear waste provides a broad range of challenges for materials science. Waste processing, waste form and engineered barrier properties, interactions between engineered and geological systems, radiation effects, chemistry and transport of waste species, and long-term predictions of repository performance are just some of the scientific problems facing modern society. This book, the 22nd in a very successful series from MRS, offers an international and inter-disciplinary perspective on the issues, and features developments in both fundamental and applied areas. Topics include: development and characterization of ceramic waste forms; ceramic waste form corrosion; glass waste form processing; glass formulation, properties and structure; glass waste form corrosion; spent nuclear fuel; performance assessment; repository backfill; flow and transport; natural analogues; container corrosion; metal waste form corrosion; radionuclide speciation and solubility; radionuclide sorption; microbial effects; radiation effects; cement waste forms and waste treatment.
Author: Gérard Liger-Belair Publisher: Princeton University Press ISBN: 140084780X Category : Cooking Languages : en Pages : 213
Book Description
The spectacular science behind champagne's effervescence Uncorked quenches our curiosity about the inner workings of one of the world's most prized beverages. Esteemed for its freshness, vitality, and sensuality, champagne is a wine of great complexity. Mysteries aplenty gush forth with the popping of that cork. Just what is that fizz? Can you judge champagne quality by how big the bubbles are, how long they last, or how they behave before they fade? And why does serving champagne in a long-stemmed flute prolong its chill and effervescence? Through lively prose and a wealth of state-of-the-art photos, this revised edition of Uncorked unlocks the door to what champagne is all about. Providing an unprecedented close-up view of the beauty in the bubbles, Gérard Liger-Belair presents images that look surprisingly like lovely flowers, geometric patterns, even galaxies as the bubbles rise through the glass and burst forth on the surface. He illustrates how bubbles form not on the glass itself but are "born" out of debris stuck on the glass wall, how they rise, and how they pop. Offering a colorful history of champagne, Liger-Belair tells us how it is made and he asks if global warming could spell champagne's demise. In a brand-new afterword, he updates the reader on new developments in the world of bubble science and delves even more deeply into the processes that give champagne its unique and beautiful character. Bubbly may tickle the nose, but Uncorked tackles what the nose and the naked eye cannot—the spectacular science that gives champagne its charm and champagne drinkers immeasurable pleasure.
Author: W. Petruk Publisher: Elsevier ISBN: 0080527337 Category : Technology & Engineering Languages : en Pages : 287
Book Description
Techniques of performing applied mineralogy investigations, and applications and capabilities of recently developed instruments for measuring mineral properties are explored in this book intended for practicing applied mineralogists, students in mineralogy and metallurgy, and mineral processing engineers. The benefits of applied mineralogy are presented by using in-depth applied mineralogy studies on base metal ores, gold ores, porphyry copper ores, iron ores and industrial minerals as examples. The chapter on base metal ores includes a discussion on the effects of liberation, particle sizes and surfaces coatings of Pb, Cu, Fe, Ca and So4- on the recoveries of sphalerite, galena and chalcopyrite. The chapter on gold discusses various methods of determining the quantities of gold in different minerals, including 'invisible' gold in pyrite and arsenopyrite, so that a balance of the distribution of gold among the minerals can be calculated. This book also discusses the roles of pyrite, oxygen, moisture and bacterial (thiobacillus ferrooxidans) on reactions that produce acidic drainage from tailings piles, and summarizes currently used and proposed methods of remediation of acidic drainage.
Author: Alexandru Grumezescu Publisher: Academic Press ISBN: 0128043784 Category : Science Languages : en Pages : 926
Book Description
Encapsulations, a volume in the Nanotechnology in the Agri-Food Industry series,presents key elements in establishing food quality through the improvement of food flavor and aroma. The major benefits of nanoencapsulation for food ingredients include improvement in bioavailability of flavor and aroma ingredients, improvement in solubility of poor water-soluble ingredients, higher ingredient retention during production process, higher activity levels of encapsulated ingredients, improved shelf life, and controlled release of flavor and aroma. This volume discusses main nanoencapsulation processes such as spray drying, melt injection, extrusion, coacervation, and emulsification. The materials used in nanoencapsulation include lipids, proteins, carbohydrates, cellulose, gums, and food grade polymers. Applications and benefits of nanoencapsulation such as controlled release, protections, and taste masking will be explained in detail. Includes the most up-to-date information on nanoencapsulation and nanocontainer-based delivery of antimicrobials Presents nanomaterials for innovation based on scientific advancements in the field Provides control release strategies to enhance bioactivity, including methods and techniques for research and innovation Provides useful tools to improve the delivery of bioactive molecules and living cells into foods
Author: Fabienne Giordano Palmino
Author: Fabienne Giordano Palmino
Author: Renaud Denoyel
Author: Laurent Luciani
Author: P. Mavros
Author: Wim Kok
Author: František Foret
Author: David J. Wronkiewicz
Author: Gérard Liger-Belair
Author: W. Petruk
Author: Alexandru Grumezescu