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Dependent light scattering in white paint films : clarification and application of the theoretical concepts / J.-C. Auger in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 3 (05/2012)
[article]
Titre : Dependent light scattering in white paint films : clarification and application of the theoretical concepts Type de document : texte imprimé Auteurs : J.-C. Auger, Auteur ; Brian Stout, Auteur Année de publication : 2012 Article en page(s) : p. 287-295 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dioxyde de titane
Lumière -- Diffusion
Pigments inorganiques
RevêtementsIndex. décimale : 667.9 Revêtements et enduits Résumé : Among the numerous publications analyzing the causes and consequences of titanium dioxide crowding on the optical properties of white paint films, one notes some inconsistencies. First, a significant number of studies are inclined to describe “dependent” and “multiple” scattering of light as distinct phenomena. Second, the transition from independent to dependent light-scattering is often associated with an ill-defined “threshold” concentration. The aim of this study is to clarify the intricate connections between these two scattering regimes and in particular to show that for white paint films loaded with rutile titanium dioxide pigments, “dependent” light scattering is merely a particular manifestation of multiple scattering processes. We also clarify that the transition from independent to dependent scattering is a continuous process that cannot be formally related to a specific threshold in the pigment volume concentration. Finally, we propose a simple method based on the dependent scattering amplitude to assist paint formulators facing the task of improving the hiding power of a white paint either by increasing the quantity of pigments or by improving their spatial state of dispersion. Note de contenu : - STUDY OF ELECTROMAGNETIC COUPLINGS INVOLVED IN LIGHT-SCATTERING PROCESSES BETWEEN TIO2 PIGMENTS : Previous clafirication - Review of the light propagation models in heterogeneous media - Charaterization of the single-to-multiple scattering transitions - Characterization of the independent-to-dependent scattering transition - Far-field coherent scattering - Evidence of far-field coherent scattering vs near-field interaction via numerical simulations - Partial conclusions
- STUDY OF THE DEPENDENT LIGHT-SCATTERING TRANSITION : Description and characterization of dependent scattering transition - Characterization of dependent light-scattering amplitude
- PRACTICAL APPLICATIONDOI : 10.1007/s11998-011-9371-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9371-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15953
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 3 (05/2012) . - p. 287-295[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14188 - Périodique Bibliothèque principale Documentaires Disponible Theoretical study and experimental analysis of the scattering efficiency of hollow polymer particles in the dependent light scattering regime / J.-C. Auger in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 4 (07/2015)
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Titre : Theoretical study and experimental analysis of the scattering efficiency of hollow polymer particles in the dependent light scattering regime Type de document : texte imprimé Auteurs : J.-C. Auger, Auteur ; Daragh Mcloughlin, Auteur Année de publication : 2015 Article en page(s) : p. 693-709 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Corps creux
Diffraction
Lumière -- Diffusion
Opacité (optique)
Particules (matières)
Polymères -- Propriétés optiques
Revêtements:Peinture
Transfert radiatifIndex. décimale : 667.9 Revêtements et enduits Résumé : We present an extensive theoretical study of the optical properties of hollow polymer particles (HPP) dispersed into a polymer resin as functions of their structure and volume-filling fraction. We show that a dependent light scattering model predicts the occurrence of three different light propagation regimes, the existence of which is consistent with experimental data gathered in the literature. We then analyze the effect of the polymer shell thickness on the magnitude of the near-field and far-field dependent light scattering phenomena. We also discuss and compare the variation of the scattering efficiency of Ropaque™, measured in our laboratory, as a function of the pigment volume-filling fraction, with dependent light scattering model. In particular, we show that in the case of HPP, quasi-linear variation of the scattering efficiency as a function of the particle volume-filling fraction is not an undeniable indication of the absence of electromagnetic couplings in the system. Finally, we used a solution of the radiative transfer equation to compare the prediction of the opacity of several simple paint films when a dependent light scattering model is used instead of the independent scattering approximation to calculate the optical properties of the films at a local scale. Note de contenu : - THEORETICAL ANALYSIS : Theoretical framework - Identification of the light scattering regimes - Optimum radius - Characterization of the type of electromagnetic couplings in the different light scattering regimes - Effect of the polymer shell's thickness
- EXPERIMENTAL EVIDENCE OF HPPs' LIGHT PROPAGATION REGIMES : Origin of the experimental data - Scattering efficiency analysis procedure - Clarification of the condition at zero PVC - Results and interpretation
- ANALYSIS OF ROPAQUE ULTRA TM OPTICAL PROPERTIES : Description and analysis of the experimental data - Analysis of the experimental data via the QCA
- INTERPRETATION OF QUASI-LINEAR VARIATION IN TERMS OF ELECTROMAGNETIC COUPLINGS
- EFFECT OF ELECTROMAGNETIC COUPLING ON MACROSCOPIC PARAMETERSDOI : 10.1007/s11998-015-9677-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9677-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24404
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 4 (07/2015) . - p. 693-709[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17366 - Périodique Bibliothèque principale Documentaires Disponible