Reflectometry of drying latex paint / Nick J. Elton in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 2 (03/2014)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 2 (03/2014) . - p. 185-197 Titre : Reflectometry of drying latex paint Type de document : texte imprimé Auteurs : Nick J. Elton, Auteur ; Anabelle Legrix, Auteur Année de publication : 2014 Article en page(s) : p. 185-197 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Brillance (optique) Formulation (Génie chimique) Latex Réfractométrie Revêtements:Peinture Rugosité Séchage Spectroscopie de réflectance Index. décimale : 667.6 Peintures Résumé : The optical properties of pigmented coatings containing titanium dioxide, calcined and hydrous kaolin, and ethylene–vinyl acetate latex at various pigment volume concentrations were measured during drying using the technique of polarized light reflectometry. Gloss (at two acceptance angles), effective refractive index (RI), microroughness, and backscattered intensity were obtained simultaneously as a function of time. It is shown that the gloss response depends on measurement geometry and the combined effects of several sample physical properties and therefore requires caution in interpretation. The combination of RI, microroughness and backscatter provides more direct information on physical transitions during drying and fits with a three-stage description of drying. Differences in drying due to pigment aspect ratio are relatively small, but the platy kaolin appears to extend the period required for solids immobilization and also prolongs measurable development of surface microstructure during film formation. Note de contenu : - THE REFLECTOMETRY TECHNIQUE : Gloss from a microrough surface - Backscatter measurement - PREPARATION AND MEASUREMENT OF PAINTS - RESULTS AND DISCUSSION : Gloss - RI, microroughness, and backscatter - Discussion - Effect of pigment shape on drying DOI : 10.1007/s11998-013-9511-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9511-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21163 [article]

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Spatial point statistics for quantifying TiO2 distribution in paint / Nick J. Elton in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 3 (05/2014)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 3 (05/2014) . - p. 443-454 Titre : Spatial point statistics for quantifying TiO2 distribution in paint Type de document : texte imprimé Auteurs : Nick J. Elton, Auteur ; Anabelle Legrix, Auteur Année de publication : 2014 Article en page(s) : p. 443-454 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agrégats (chimie) Diffusion (physique) Dioxyde de titane Revêtements -- Analyse:Peinture -- Analyse Simulation par ordinateur Statistique mathématique Index. décimale : 667.9 Revêtements et enduits Résumé : Spatial point statistics such as Clark-Evans R, Ripley’s K, and the neighborhood distribution function (NDF) have been used to study the spatial distribution of TiO2 particles in sections of paint films. Particle coordinates were obtained from electron micrographs. Ripley’s K and the NDF are particularly useful in detecting segregation, randomness, or aggregation at various length scales. Other statistics such as aggregate-size distributions were also calculated. The spatial distribution in well-dispersed paints studied here is essentially random and observed aggregates are explained by the spatial inhomogeneity inherent in the random distributions. The aggregate-size distributions are approximately logarithmic for well-dispersed paints. Mean aggregate size increases with increasing pigment volume concentration (15–30%PVC), even though the spatial distribution remains random, showing that crowding at high PVC is a heterogeneous process. Mean aggregate sizes determined by microscopy correlate well with opacity and other paint properties. Computer simulation shows that spatial point and aggregate-size analysis of points in 2-D slices taken from a 3-D volume underestimate absolute aggregate sizes, but that spatial statistics and aggregate distributions correlate strongly with those obtained from the original 3-D distribution. Therefore, results from analysis of micrographs are expected to translate to the 3-D paint film. As expected, coarse extenders crowd the TiO2 and increase aggregation, but highly anisodiametric particles appear less deleterious than blocky particles. Note de contenu : - STATISTICAL METHODS AND MODELLING : Spatial point statistics - Aggregate statistics - Effect of taking 2-D sections through a 3-D volume - EXPERIMENTAL METHODS - EXPERIMENTAL RESULTS DOI : 10.1007/s11998-013-9564-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9564-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21480 [article]

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Wavelength dependence of Kubelka–Munk scattering spectra for studies of TiO2 microstructure and aggregation in paints / Nick J. Elton in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 4 (07/2014)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 4 (07/2014) . - p. 555-566 Titre : Wavelength dependence of Kubelka–Munk scattering spectra for studies of TiO2 microstructure and aggregation in paints Type de document : texte imprimé Auteurs : Nick J. Elton, Auteur ; Anabelle Legrix, Auteur Année de publication : 2014 Article en page(s) : p. 555-566 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Concentration pigmentaire volumique Dioxyde de titane Floculation Mie, Diffusion de Précipitation (chimie) Réflectance Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : The wavelength exponent β is easily determined from diffuse reflectance spectra as the gradient of a log–log plot of the Kubelka–Munk scattering coefficient (S) against wavelength. Previous work suggests that β provides a useful relative measure of the size of scattering units applicable to many particulate systems. This article examines the applicability of β to paints, specifically studies of TiO2 aggregation, and comments on its wider use for pigmented coatings. Modelling using multisphere T-matrix Mie methods shows that β varies nearly linearly with the mean aggregate size. Experimental data shows good correlation between the state of aggregation and β. However, β depends strongly on the volume fraction of TiO2 owing to the effects of dependent scattering arising from crowding, therefore comparisons between paints can only be made at constant effective TiO2 volume fraction. A simple effective medium refractive index model in conjunction with Mie scattering appears to give a good account of the behavior of both S and β with increasing TiO2 volume concentration. When air is incorporated into the coatings at high pigment volume fractions, scattering is much more complicated. In this case it appears very difficult to relate β directly to coating microstructure properties such as pore diameter. Note de contenu : - THEORY - MODELLING : Method - Single particles - Aggregates - EXPERIMENTAL - EXPERIMENTAL RESULTS : Paints below the CPVC - Paints above the CPVC DOI : 10.1007/s11998-014-9567-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9567-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21716 [article]

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