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]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 3 (05/2012) . - p. 287-295 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 Revêtements Index. 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 APPLICATION DOI : 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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15953 [article]

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Discussion on dependent light scattering phenomenon in white paint films / Jean-Claude Auger in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 6 (11/2013)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 6 (11/2013) . - p. 929-931 Titre : Discussion on dependent light scattering phenomenon in white paint films Type de document : texte imprimé Auteurs : Jean-Claude Auger, Auteur ; Brian Stout, Auteur Année de publication : 2013 Article en page(s) : p. 929-931 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chlorure de polyvinyle Dioxyde de titane Lumière -- Diffusion Revêtements -- Propriétés optiques:Peinture -- Propriétés optiques Index. décimale : 667.6 Peintures Note de contenu : - Relation between dependent and multiple scattering - Independent/dependent scattering transition - Practical semiempirical hiding models for paints - The dependent light scattering model DOI : 10.1007/s11998-013-9539-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9539-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19835 [article]

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Theoretical study of the scattering efficiency of rutile titanium dioxide pigments as a function of their spatial dispersion / Jean-Claude Auger in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 1 (03/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 1 (03/2009) . - p. 89-97 Titre : Theoretical study of the scattering efficiency of rutile titanium dioxide pigments as a function of their spatial dispersion Type de document : texte imprimé Auteurs : Jean-Claude Auger, Auteur ; Brian Stout, Auteur ; Vincent Arnaud Martinez, Auteur Année de publication : 2009 Article en page(s) : p. 89-97 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dioxyde de titane Dispersions et suspensions Pigments -- Propriétés optiques Revêtements Tags : Optical  property  Opacity  Rutile  titanium  dioxide  pigment  Dependent  scattering  Multiple  Spatial  dispersion  T-matrix  formalism Index. décimale : 667.9 Revêtements et enduits Résumé : We propose an original theoretical framework to model the scattering efficiency of white paint films as a function of the volume fraction and spatial state of dispersion of rutile titanium dioxide pigments, taking into account electromagnetic couplings. Numerical calculations are performed using a multiple T matrix formalism on an “elemental” volume extracted from the bulk of the paint and which we model as pigments and fillers in a polymer matrix. Qualitative studies show that, due to the dependent scattering phenomenon, the size of fillers can modulate the magnitude of loss in scattering efficiency by modifying the spatial state of dispersion of the pigments in the polymer matrix. In particular, fillers whose size is comparable to the dimension of the pigments improve the scattering efficiency by impeding crowding. It is also shown that the optical properties of the bulk material at arbitrary concentration can be approximated by extrapolating the optical properties calculated on a limited number of scatterers. DOI : 10.1007/s11998-008-9116-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9116-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4877 [article]

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