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Author: ZEINEB.. ACHOUR
Publisher:
ISBN:
Category :
Languages : fr
Pages : 316
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Book Description
DES DEPOTS DE CRISTAUX D'HYDROCARBURES, SE FORMENT DANS LES GAZOLES A BASSE TEMPERATURE. CEUX-CI SONT PRINCIPALEMENT CONSTITUES DE N-ALCANES QUI FORMENT ENTRE EUX DES SOLUTIONS SOLIDES. POUR PREVOIR CETTE CRISTALLISATION, IL EST NECESSAIRE DE CONNAITRE LES PROPRIETES THERMODYNAMIQUES DES MELANGES SOLIDES. LE BUT DE CE TRAVAIL EST L'ETUDE DU SYSTEME BINAIRE DE N-ALCANES PAIRS N-TETRACOSANE (N-C#2#4H#5#0): N-HEXACOSANE (N-C#2#6H#5#4), DONT LE DIAGRAMME EST INCOMPLET. APRES UNE DESCRIPTION DES METHODES EXPERIMENTALES UTILISEES, ET UNE REVUE BIBLIOGRAPHIQUE SUR LES N-ALCANES PURS ET EN MELANGES BINAIRES, LE DIAGRAMME DE PHASES N-TETRACOSANE: N-HEXACOSANE EST ETABLI EXPERIMENTALEMENT PAR ANALYSE THERMIQUE DIFFERENTIELLE, ENTHALPIMETRIQUE DIFFERENTIELLE ET RADIOCRISTALLOGRAPHIE. IL EST MIS EN EVIDENCE A 293 K ET EN FONCTION DE LA CONCENTRATION MOLAIRE EN N-HEXACOSANE, LA PRESENCE DE DEUX SOLUTIONS PRIMAIRES DE STRUCTURE TRICLINIQUE ET DE TROIS SOLUTIONS SOLIDES INTERMEDIAIRES DE STRUCTURE ORTHORHOMBIQUE. LE COMPORTEMENT DES MELANGES EN FONCTION DE LA TEMPERATURE FAIT APPARAITRE QUATRE OU CINQ SEQUENCES DE PHASES SELON LA SOLUTION SOLIDE CONSIDEREE. UNE SYSTEMATIQUE DE DIAGRAMMES BINAIRES DE N-ALCANES PAIRS DIFFERENTS DE DEUX CARBONES EST ETABLIE PAR ANALOGIE AVEC LE SYSTEME N-DOCOSANE (N-C#2#2H#4#6): N-TETRACOSANE (N-C#2#4H#5#0) ET LE SYSTEME N-EICOSANE (N-C#2#0H#4#2): N-DOCOSANE (N-C#2#2H#4#6). LE TRAITEMENT DES MESURES ENTHALPIMETRIQUES EST ENSUITE EFFECTUE. LES VARIATIONS D'ENTHALPIE EN FONCTION DE LA TEMPERATURE DES SOLUTIONS SOLIDES QUI APPARAISSENT A TEMPERATURE AMBIANTE SONT TRAITEES PAR UNE EXPRESSION DERIVEE DU SOLIDE D'EINSTEIN. LES ENTHALPIES ET LES ENTROPIES D'EXCES, DES DIFFERENTES PHASES SONT REPRESENTEES PAR UN MODELE DE MARGULES A DEUX TERMES. CELLES-CI JOINTES AUX TEMPERATURES ET AUX ENTHALPIES DE TRANSITION DES CORPS PURS PERMETTENT DE CALCULER LES COURBES LIMITES DE PHASES DES DIFFERENTS EQUILIBRES. LE DIAGRAMME AINSI CALCULE COINCIDE AVEC CELUI ETABLI EXPERIMENTALEMENT
Author: ZEINEB.. ACHOUR
Publisher:
ISBN:
Category :
Languages : fr
Pages : 316
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Book Description
DES DEPOTS DE CRISTAUX D'HYDROCARBURES, SE FORMENT DANS LES GAZOLES A BASSE TEMPERATURE. CEUX-CI SONT PRINCIPALEMENT CONSTITUES DE N-ALCANES QUI FORMENT ENTRE EUX DES SOLUTIONS SOLIDES. POUR PREVOIR CETTE CRISTALLISATION, IL EST NECESSAIRE DE CONNAITRE LES PROPRIETES THERMODYNAMIQUES DES MELANGES SOLIDES. LE BUT DE CE TRAVAIL EST L'ETUDE DU SYSTEME BINAIRE DE N-ALCANES PAIRS N-TETRACOSANE (N-C#2#4H#5#0): N-HEXACOSANE (N-C#2#6H#5#4), DONT LE DIAGRAMME EST INCOMPLET. APRES UNE DESCRIPTION DES METHODES EXPERIMENTALES UTILISEES, ET UNE REVUE BIBLIOGRAPHIQUE SUR LES N-ALCANES PURS ET EN MELANGES BINAIRES, LE DIAGRAMME DE PHASES N-TETRACOSANE: N-HEXACOSANE EST ETABLI EXPERIMENTALEMENT PAR ANALYSE THERMIQUE DIFFERENTIELLE, ENTHALPIMETRIQUE DIFFERENTIELLE ET RADIOCRISTALLOGRAPHIE. IL EST MIS EN EVIDENCE A 293 K ET EN FONCTION DE LA CONCENTRATION MOLAIRE EN N-HEXACOSANE, LA PRESENCE DE DEUX SOLUTIONS PRIMAIRES DE STRUCTURE TRICLINIQUE ET DE TROIS SOLUTIONS SOLIDES INTERMEDIAIRES DE STRUCTURE ORTHORHOMBIQUE. LE COMPORTEMENT DES MELANGES EN FONCTION DE LA TEMPERATURE FAIT APPARAITRE QUATRE OU CINQ SEQUENCES DE PHASES SELON LA SOLUTION SOLIDE CONSIDEREE. UNE SYSTEMATIQUE DE DIAGRAMMES BINAIRES DE N-ALCANES PAIRS DIFFERENTS DE DEUX CARBONES EST ETABLIE PAR ANALOGIE AVEC LE SYSTEME N-DOCOSANE (N-C#2#2H#4#6): N-TETRACOSANE (N-C#2#4H#5#0) ET LE SYSTEME N-EICOSANE (N-C#2#0H#4#2): N-DOCOSANE (N-C#2#2H#4#6). LE TRAITEMENT DES MESURES ENTHALPIMETRIQUES EST ENSUITE EFFECTUE. LES VARIATIONS D'ENTHALPIE EN FONCTION DE LA TEMPERATURE DES SOLUTIONS SOLIDES QUI APPARAISSENT A TEMPERATURE AMBIANTE SONT TRAITEES PAR UNE EXPRESSION DERIVEE DU SOLIDE D'EINSTEIN. LES ENTHALPIES ET LES ENTROPIES D'EXCES, DES DIFFERENTES PHASES SONT REPRESENTEES PAR UN MODELE DE MARGULES A DEUX TERMES. CELLES-CI JOINTES AUX TEMPERATURES ET AUX ENTHALPIES DE TRANSITION DES CORPS PURS PERMETTENT DE CALCULER LES COURBES LIMITES DE PHASES DES DIFFERENTS EQUILIBRES. LE DIAGRAMME AINSI CALCULE COINCIDE AVEC CELUI ETABLI EXPERIMENTALEMENT
Author: Nasr-Eddine Hasnaoui
Publisher:
ISBN:
Category :
Languages : fr
Pages : 394
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Book Description
L'étude cristallographique sur les corps purs (docosane, tricosane, tétracosane) amène d'une part, à confirmer les différentes transformations allotropiques et d'autre part, à observer la transition delta du n-tricosane et sur le mélange binaire (docosane-tétracosane), elle a conduit à la mise en évidence de nouvelles phases intermédiaires de structures orthorhombiques. Par ailleurs, l'étude calorimétrique sur les corps purs a permis de compléter les données thermodynamiques dans ce domaine, et de les étendre jusqu'au tetracosane ; sur les mélanges elle a conduit à la détermination des enthalpies de formation du solide et du liquide. Enfin, les deux études ont conduit à l'établissement du diagramme binaire docosane-tétracosane
Author: E. S. Domalski
Publisher: American Institute of Physics
ISBN:
Category : Science
Languages : en
Pages : 312
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Book Description
Author: M.E. Minas da Piedade
Publisher: Springer
ISBN: 9780792357414
Category : Science
Languages : en
Pages : 0
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Book Description
Covers the major experimental and theoretical methods currently used to study the energetics of stable molecules and reactive intermediates. Reviews the ate of the art and shows the interplay of experimental and theoretical methods used to probe bonding energetics and reactivity and a wide range of chemical species. A modern and invaluable introduction to the study of molecular energetics. A reference for workers currently involved in the field.
Author: Jaroslav Šesták
Publisher: Springer Science & Business Media
ISBN: 904812882X
Category : Technology & Engineering
Languages : en
Pages : 392
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Book Description
Provides a summary of non-equilibrium glassy and amorphous structures and their macro- and microscopic thermal properties. The book contains a carefully selected works of fourteen internationally recognized scientists involving the advances of the physics and chemistry of the glassy and amorphous states.
Author: P. Somasundaran
Publisher: CRC Press
ISBN: 9780849395741
Category : Science
Languages : en
Pages : 1084
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Author: Peter Hess
Publisher: Springer
ISBN: 9783662137048
Category : Science
Languages : en
Pages : 575
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Book Description
photoacoustic and Photothermal Phenomena contains reviews and a large numberof selected contributed papers reporting progress in the application of new photoacoustic and photo- thermal techniques in physics, chemistry, biology, medicine and materials science. Theoretical and experimental work is presented on spectroscopy, kinetics and relaxation, trace analysis, mass and heat transport, surfaces and thin films, nondestructive evaluation,ultrasonics and semiconductors.
Author: L. Echegoyen
Publisher: Springer
ISBN: 9789401066280
Category : Science
Languages : en
Pages : 492
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Book Description
The field of Supramolecular chemistry has reached a high level of sophistication and maturity, especially in the last 5-10 years. The sophistication is primarily evident in the highly complex chemical architectures that have been synthesized to accomplish specific functions such as selective binding and transport of substrates, in catalysis, and for the formation of assemblies, to name just a few of the applications. Many other molecular structures have been synthesized to form unusual materials with interesting and/or useful properties. From this point of view, the field is mature, as would have been anticipated from its historical development, starting in 1967 with Pedersen and the crown ethers. Since that time, the field has evolved mainly from a synthetic organic perspective. There are notable exceptions to this statement, but in general it holds true that the major advances were made in the laboratories of organic chemists with considerable topological insight. by The design and synthesis of the molecules was also partly guided physical insight provided by measurements and calculations done by physical chemists. As a consequence, many chemical systems were synthesized in relatively small amounts to afford their full characterization but not in large enough quantities to fully explore their intended properties or structures. Thus in the decades of the 70's and 80's physical chemists played an important role in guiding the future directions in the field, providing needed structural and energetic information and providing improved experimental designs.
Author: Wolfgang Sigmund
Publisher: CRC Press
ISBN: 142000753X
Category : Science
Languages : en
Pages : 424
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Book Description
Despite the widespread growth and acceptance of particulate technology, challenges in the design, operation, and manufacturing of these systems still exists. These critical issues must be resolved so that particle technology may continue to serve as a foundation for new nano and biotechnologies. Particulate Systems in Nano- and Biotechnologies pres
Author: Toyoko Imae
Publisher: Elsevier
ISBN: 0080475051
Category : Science
Languages : en
Pages : 378
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Book Description
Advanced Chemistry of Monolayers at Interfaces describes the advanced chemistry of monolayers at interfaces. Focusing on the recent trends of methodology and technology, which are indispensable in monolayer science. They are applied to monolayers of surfactants, amphiphiles, polymers, dendrimers, enzymes, and proteins, which serve many uses. Introduces the methodologies of scanning probe microscopy, surface force instrumentation, surface spectroscopy, surface plasmon optics, reflectometry, and near-field scanning optical microscopy. Modern interface reaction method, lithographic technology and different types of monolayers like adsorption, Langmuir and Langmuir-Blodgett monolayers at air/liquid, liquid/liquid, liquid/solid and air/solid interfaces, are all covered. Introducing novel methodologies and technologies Covering the different types of monolayers Discusses all currently available instrumental techniques for studying all types of monolayer
