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On the use of an internal mixer to study the impregnation of carbon fillers by organic liquids / Meral Akkoyun in APPLIED RHEOLOGY, Vol. 24, N° 1 (2014)

[article]  inAPPLIED RHEOLOGY > Vol. 24, N° 1 (2014) . - 8 p. Titre : On the use of an internal mixer to study the impregnation of carbon fillers by organic liquids Type de document : texte imprimé Auteurs : Meral Akkoyun, Auteur ; Christian Carrot, Auteur ; Benoît Blottière, Auteur Année de publication : 2014 Article en page(s) : 8 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Carbonate de propylène Charbon actif Diméthylsulfoxyde Malaxeurs et mélangeurs Matériaux -- Imprégnation Rhéologie Index. décimale : 532.05 Mécanique des fluides et des liquides - Dynamique (cinétique et cinématique) Résumé : lmpregnation of organic liquid electrolytes in conductive powders is of major importance in the field of energy storage devices such as batteries or super-capacitors. Impregnation during mixing and processing operations becomes usual for practical reasons and requires a better understanding of the changes of the rheological behavior of the mix. In this paper, the impregnation of propylene carbonate (PC) and dimethyl sulfoxide (DMSO) in activated carbon (AC) and carbon black (CB) was studied by using an internal mixer. Monitoring of the torque of the filler/liquid blend as a function of the amount of liquid fed in the mixing chamber, enables to detect the transition from the solid friction of the dry powder to the lubricated liquid (or viscous) behaviour of the concentrated paste of wetted powder. The results were compared with data obtained by conventional nitrogen adsorption porosimetry combined with the knowledge of the molecular diameter of the liquids. A characteristic change was observed as soon as the liquid completely fills the porosity of the filler. Both tested liquids (DMSO and PC) impregnate more carbon black and the take-up rate is slightly higher for DMSO in comparison to PC because, as a polar liquid, DMSO has a better interaction with both fillers. Note de contenu : - MATERIALS AND METHODS : Materials - Experiments - RESULTS AND DISCUSSION : Intrusion of DMSO and PC in activated carbon : results from internal mixer - Adsorption of DMSO and PC on activated carbon : results from nitrogen porosimetry - Adsorption of DMSO and PC on activated carbon : the transition from frictional to hydrodynamic regime - Intrusion of DMSO and PC in carbon black - Comparison of the intrusion of PC and DMSO in activated carbon and carbon black Référence de l'article : 13487 DOI : 10.3933/ApplRheol-24-13487 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21554 [article]

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General aspects of yield stress fluids - Terminology and definition of viscosity / Martin Boisly in APPLIED RHEOLOGY, Vol. 24, N° 1 (2014)

[article]  inAPPLIED RHEOLOGY > Vol. 24, N° 1 (2014) . - 11 p. Titre : General aspects of yield stress fluids - Terminology and definition of viscosity Type de document : texte imprimé Auteurs : Martin Boisly, Auteur ; Markus Kästner, Auteur ; Jörg Brummund, Auteur ; Volker Ulbricht, Auteur Année de publication : 2014 Article en page(s) : 11 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Fluides non newtoniens Fluides, Mécanique des Rhéologie Viscosité Tags : 'Fluide  de  stress'  'Viscosité  différentielle'  Viscosité  apparente'  'Contrainte  d'équilibre'  'Elément  friction'  'Élément  Bingham' Index. décimale : 532.05 Mécanique des fluides et des liquides - Dynamique (cinétique et cinématique) Résumé : This work contributes to general theoretical aspects of yield stress fluids with significance for practical phenomenological material modeling. It introduces a terminology so that the material class 'yield stress fluid' is defined and can be distinguished from the terms `solid' and liquide. This new material classification is based on two criteria, the equilibrium relation and the flow function. In line with this terminology, an experimental procedure for classifying the material behavior is presented. The second key aspect of this paper is a discussion on the proper definition of the term 'viscosity'. The benefit of the differential viscosity over the dynamic viscosity in case of non-Newtonian fluids in general is worked out. This is shown by the most ele-mentary yield stress fluid, the friction element, because it is the basis of the yield stress concept. Its constitutive equations are given for positive as well as negative strain rates and are also able to represent the preyield behavior. The theory presented in this article is also applied to the Maxwell, Kelvin-Voigt, and Bingham element to demonstrate the working principle. Note de contenu : - SPLIT OF THE TOTAL STRESS INTO AN EQUILIBRIUM AND OVERSTRESS - DIFFERENTIAL VISCOSITY DEFINED BY THE STEADY STATE MATERIAL RESPONSE TO A CONSTANT STRAIN RATE LOADING - CLASSIFICATION OF MATERIAL BEHAVIOR INTO THREE TYPES : SOLIDS, LIQUIDS AND YIELD STRESS FLUIDS - DISCUSSION OF THE DIFFERENTIAL VISCOSITY AND DEMONSTRATION OF THE FUNCTIONALITY OF THE MATERIAL CLASSIFICATION BY STANDARD AND EXTENDED RHEOLOGICAL ELEMENTS : Constitutive equations of standard rheological elements used to illustrate the theoretical statements of this article - Illustrating the benefit of a differential viscosity by standard rheological elements - Application of the material classification to standard rheological elements - Application of the material classification to extended rheological elements Référence de l'article : 14578 DOI : 10.3933/ApplRheol-24-14578 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21555 [article]

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Characterization of material viscoelasticity at large deformations / Sergey Ilyin in APPLIED RHEOLOGY, Vol. 24, N° 1 (2014)

[article]  inAPPLIED RHEOLOGY > Vol. 24, N° 1 (2014) . - 10 p. Titre : Characterization of material viscoelasticity at large deformations Type de document : texte imprimé Auteurs : Sergey Ilyin, Auteur ; Valery Kulichikhin, Auteur ; Alexander Malkin, Auteur Année de publication : 2014 Article en page(s) : 10 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Elasticité Rhéologie Viscoélasticité Tags : Viscoelasticity  'Non-linearity'  'Large  strain'  Suspensions Index. décimale : 532.05 Mécanique des fluides et des liquides - Dynamique (cinétique et cinématique) Résumé : Mechanical properties of various technological materials at large deformations are proposed to characterize by means of some generalized parameters obtained at large oscillation strains but not related to any definite rheological equations. The base for the a na lysis is the Lissajous-Bowditch figures in two coordinate systems —"stress — deformation" and "stress derivative with respect to the phase angle — deformation." An area of the first of these figures provides the well known integral estimation of dissipative losses in the deformation cycle while the second one presents the new integral measure of the matter's elasticity. The correlation between the proposed integral estimations of the "averaged" dynamic modulus and the values found in using Fourier and Cheby¬shev series was demonstrated. This integral method was applied for three suspensions of various types. The obtained results allowed for viewing the type of non-linearity : pseudo-plasticity or dilatancy, stiffening or softening, as functions of deformation. Note de contenu : - EXPERIMENTAL SETTINGS : Materials and suspension preparation - Instrumentation - RESULTS AND DISCUSSION : Silica suspensions in a low-molecular-weight matrix - Silica suspensions in organic oligomer - Mineral goethite in transformer oil Référence de l'article : 13653 DOI : 10.3933/ApplRheol-24-13653 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21556 [article]

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Structural and thermomechanical investigation of lyotropic liquid crystal phases doped with monodisperse microparticles / Alain Ponton in APPLIED RHEOLOGY, Vol. 24, N° 1 (2014)

[article]  inAPPLIED RHEOLOGY > Vol. 24, N° 1 (2014) . - 7 p. Titre : Structural and thermomechanical investigation of lyotropic liquid crystal phases doped with monodisperse microparticles Type de document : texte imprimé Auteurs : Alain Ponton, Auteur ; C. Meyer, Auteur ; G. Foyart, Auteur ; L. Aymard, Auteur ; K. Djellab, Auteur Année de publication : 2014 Article en page(s) : 7 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Amidons Calcaire Cristaux liquides lyotropes Dispersions et suspensions Gommes et résines Matériaux cimentaires Particules (matières) Stabilisants (chimie) Index. décimale : 532.05 Mécanique des fluides et des liquides - Dynamique (cinétique et cinématique) Résumé : We present a study of the structural and thermomechanical properties of lyotropic phase in the quasi ternary system made of Cetylpyridinium chloride (CPCI)/hexanol/salt water (0.9% by mass) with and without cobalt microparticles. Phase transition temperatures of the structural sequence isotropic L,/nematic calamitic Nc,/hexagonal H have been determined by differential scanning microcalorimetry. Temperature induced developable domains in hexagonal phase H and disclinations in calamitic nematic phase Nc, were observed in crossed polar optical microscopy in confined geometry. A rheological study of calamitic nematic phase NIc highlighted structuring effect of cobalt microparticles from a concentration of 2 % to be demon-strated by an increase in viscosity and viscoelastic moduli. This could be explained by a stabilization of disclinations. Note de contenu : - STUDIED MATERIALS AND EXPERIMENTAL METHODS : Sample preparation - Quasi-ternary system - Experimental methods - RESULTS : Differential scanning microscopy - Analysis of defective macroscopic textures by optical microscopy - Shear rheology Référence de l'article : 14147 DOI : 10.3933/ApplRheol-24-14147 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21557 [article]

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