Diffractive pigments help document security / Alberto Argoitia in EUROPEAN COATINGS JOURNAL (ECJ), N° 11/2004 (11/2004)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 11/2004 (11/2004) . - p. 32-35 Titre : Diffractive pigments help document security Type de document : texte imprimé Auteurs : Alberto Argoitia, Auteur ; Sean Chu, Auteur Année de publication : 2004 Article en page(s) : p. 32-35 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Diffraction Holographie Magnétisme Pigments Index. décimale : 667.2 Colorants et pigments Résumé : The concept of printable holograms is appealing for document security because these devices cannot be replicated by computer scanning, colour copiers, photography, or other commonly-used forgery techniques. Printable holograms can be created by combining existing technologies in thin film and diffractive interference with pigment design and a novel application of simple magnetic field theory. Further security enhancements are possible by incorporating other overt and covert features like optically variable pigments, fluorescent pigments, dyes taggants or by including specially shaped flakes as part of the overall pigment design. Note de contenu : - Oriented flakes contribute to the diffractive - Lowest energy is achieved when the particles are oriented - Magnetic diffractive pigments preparation - Design 1 created a bright silver coloration - Optical characterization and the orientation of diffractive piments - Agreement of experimental data and theory - Red to gold optical design changed colour trajectory - Diffractive optically variable image devices for security - Combining features to achieve extra security - Concept of printable holograms is appealing - Table 1 : Grafting foil stustrate used in this study En ligne : https://drive.google.com/file/d/15y9QYqA0I7BCSNSEAUIDdEpPSAC-VeST/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40659 [article]

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Light diffraction used as optical instrument to measure texturing of filament yarns / Eric Schulte Südhoff in CHEMICAL FIBERS INTERNATIONAL, Vol. 66, N° 1 (03/2016)  

[article]  inCHEMICAL FIBERS INTERNATIONAL > Vol. 66, N° 1 (03/2016) . - p. 37-39 Titre : Light diffraction used as optical instrument to measure texturing of filament yarns Type de document : texte imprimé Auteurs : Eric Schulte Südhoff, Auteur ; Lukasz Debicki, Auteur ; Michael Decius, Auteur ; Lukas Merten, Auteur ; Volker Niebel, Auteur ; Gunnar Seide, Auteur ; Thomas Gries, Auteur Année de publication : 2016 Article en page(s) : p. 37-39 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Diffraction Filaments Fibre de longueur infinie ou extrême comme celle qu'on trouve dans la soie à l'état naturel. Les fibres manufacturées sont extrudées en filaments qui sont transformés en fils continus, en fibres courtes ou en câbles. Lumière visible Mesures optiques Texturation Procédé de frisure, conférant des boucles au hasard, ou modifiant d'une autre manière un fil de filament continu afin d'augmenter son pouvoir couvrant, sa résilience, sa résistance à l'abrasion, sa chaleur, son pouvoir d'isolation thermique, son pouvoir d'absorption d'humidité, ou pour lui donner une texture de surface différente. Les procédés de texturation peuvent être regroupés en six catégories. Index. décimale : 677 Textiles Résumé : Non-textured filament yarns tend to exist side by side in a parallel and even way. The surface is smooth compared to the less uniform and hairy surface of staple fiber yarns. For many applications staple fiber specific properties are desirable with retention of the continuity of a filament at the same time. Through texturing the filament yarns obtain customizable properties such as high bulk, high elasticity and porosity. The properties of textured filament yarns are currently measured offline in the laboratory. Online optical methods for the characterization of filament yarns on the running yarn do not exist. Offline measurement methods are costly and generate only statistical information on the quality of the yarn by random sampling. Besides the state-of-the-art of the measurement of textured yarn parameters, a potential method for the direct optical measurement of textured filament yarn is presented here. Note de contenu : - Texturing principals, measurement capabilities and characteristics - Innovative approach for optical measurement of texturing of filament yarns En ligne : https://drive.google.com/file/d/1ElqOpmb-YJfwIGDHLYswLrZPTskxsWHx/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25845 [article]

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Light diffraction used as optical instrument to measure texturing of filament yarns / Eric Schulte Südhoff in CHEMICAL FIBERS INTERNATIONAL, (09/2016)  

[article]  inCHEMICAL FIBERS INTERNATIONAL > (09/2016) . - p. 78-80 Titre : Light diffraction used as optical instrument to measure texturing of filament yarns Type de document : texte imprimé Auteurs : Eric Schulte Südhoff, Auteur ; Lukasz Debicki, Auteur ; Michael Decius, Auteur ; Lukas Merten, Auteur ; Volker Niebel, Auteur ; Gunnar Seide, Auteur ; Thomas Gries, Auteur Année de publication : 2016 Article en page(s) : p. 78-80 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Diffraction Filaments Fibre de longueur infinie ou extrême comme celle qu'on trouve dans la soie à l'état naturel. Les fibres manufacturées sont extrudées en filaments qui sont transformés en fils continus, en fibres courtes ou en câbles. Lumière visible Mesures optiques Texturation Procédé de frisure, conférant des boucles au hasard, ou modifiant d'une autre manière un fil de filament continu afin d'augmenter son pouvoir couvrant, sa résilience, sa résistance à l'abrasion, sa chaleur, son pouvoir d'isolation thermique, son pouvoir d'absorption d'humidité, ou pour lui donner une texture de surface différente. Les procédés de texturation peuvent être regroupés en six catégories. Index. décimale : 677.4 Textiles artificiels Résumé : Non-textured filament yarns tend to exist side by side in a parallel and even way. The surface is smooth compared to the less uniform and hairy surface of staple fiber yarns. For many applications staple fiber specific properties are desirable with retention of the continuity of a filament at the same time. Through texturing the filament yarns obtain customizable properties such as high bulk, high elasticity and porosity. The properties of textured filament yams are currently measured offline in the laboratory. Online optical methods for the characterization of filament yarns on the running yarn do not exist Offline measurement methods are costly and generate only statistical information on the quality of the yarn by random sampling. Besides the state-of-the-art of the measurement of textured yarn parameters, a potential method for the direct optical measurement of textured filament yarn is presented here. Note de contenu : - Texturing principals, measurement capabilities and characteristics - Innovative approach for optical measurement of texturing of filament yarns En ligne : https://drive.google.com/file/d/1qHdtheBONIcxuUooiurOGS9vd_txvPMp/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26939 [article]

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Novel optical effects / Barbara Parker in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 195, N° 4487 (04/2005)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 195, N° 4487 (04/2005) . - p. 26-32 Titre : Novel optical effects Type de document : texte imprimé Auteurs : Barbara Parker, Auteur Année de publication : 2005 Article en page(s) : p. 26-32 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Diffraction Lumière visible Pigments Index. décimale : 667.2 Colorants et pigments Résumé : The author explains why diffractive light technology is used instead of thin film interference to produce a new family of pigments. Basic concepts of diffraction grating theory, together with principles of platelet-like pigments, where taken into consideration when creating of this new family of pigments. The optical properties of these pigments are based on optical interference by diffraction instead of thin film optical interference used on traditional optical variable pigments. By controlling the physical dimensions and surface microstructure, diffractive pigment generates the appearance of multiple, bright rainbow-producing prisms moving over a liquid silver colour. The effect is pleasing, elegant and exhibits dramatic visual appeal that is unique, durable and easy to incorporate. Diffractive pigment opens new worlds of design possibilities and adds value and appeal to virtually any product. Note de contenu : - Light interference - Thin film light interference - Diffractive light interference - Diffraction of light by a grating - Diffractive pigment development - Optical properties - Morphological properties - Physical properties - Accelerated weathering - South Florida weathering - Circulation resistance - Shelf stability - Pigment application Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27642 [article]

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Optical analysis of coatings including diffractive pigments using a high-resolution gonioreflectometer / Jiri Filip in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 555-572 Titre : Optical analysis of coatings including diffractive pigments using a high-resolution gonioreflectometer Type de document : texte imprimé Auteurs : Jiri Filip, Auteur ; Radomir Vavra, Auteur ; Frank J. Maile, Auteur Année de publication : 2019 Article en page(s) : p. 555-572 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Diffraction Goniométrie Pigments à effets spéciaux Revêtements -- Propriétés optiques Spectroscopie de réflectance Index. décimale : 667.9 Revêtements et enduits Résumé : The aim of this article is to demonstrate a new way of measuring and understanding the appearance of pigment flake orientation and texture in special effect pigments for use in industrial coatings. We have used diffractive pigments and analyzed the relative orientation of the particles in the coating layers by evaluating their behavior in two common industry applications: solventborne and powder coatings. We have measured the interference color by taking readings with a high-resolution gonioreflectometer, in order to test the viability of automatic diffractive pigment evaluation. The results were analyzed using both psychophysical (i.e., human) and computational (i.e., mechanical) methods. Our later psychophysical and computational analysis of the visual differences that diffractive pigments present in both solventborne (1) and powder coating (2) systems for in-plane and out-of-plane geometries revealed that solventborne liquid paint systems better preserve the appearance of original diffraction gratings. This is due to enhanced orientation of the anisotropic pigment particles. The powder coating surfaces investigated, on the other hand, preserved higher intensity and thus visibility in randomly oriented solitary flakes, creating a greater sparkle contrast. We confirmed our findings by capturing and visualizing coating appearance by means of a bidirectional texture function. We then compared the diffractive pigment evaluation results with other state-of-the-art measuring device readings. We believe that our work provides valuable information on flake orientation and also compares pigment performance in a range of industrial coating systems, which may enable industrial companies to improve paint spraying processes. Note de contenu : - INTRODUCTION : The use of diffractive pigments in industry - The optical appearance of surfaces including diffractive pigments - Manufacture of diffractive pigments - Coatings systems analyzed for this study and panel preparation - EXISTING ANALYSIS METHODS FOR EFFECT COATINGS TO DATE : Angular analysis of effect pigments in general - Analysis of coatings containing diffractive pigments - Texture analysis of effect coatings - MOTIVATION EXPERIMENT ON THE VISUAL APPEARANCE OF DIFFRACTIVE PIGMENTS - DEVELOOPMENT OF AN AUTOMATIC METHOD OF DIFFRACTIVE PIGMENT : Apearance acquisition system - Geometry decription - ANALYSIS : Psychophysical analysis - Computational texture data analysis - EXPERIMENTS ON PIGMENTS OF VARYING CONCENTRATION : Higher pigmentation samples - Lower pigmentation samples - COMPARISON OF PROPOSED METHOD TO A STATE-OF-THE-ART TEXTURE MEASUREMENT DEVICE - CAPTURE APPEARANCE ON COATED OBJECTS DOI : 10.1007/s11998-018-0137-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0137-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32425 [article]

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"Le pire des défauts..." / Maryvonne Hervieu in L'ACTUALITE CHIMIQUE, N° 387-388-389 (07-08-09-10/2014)  

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Les quasi-cristaux / Denis Gratias in L'ACTUALITE CHIMIQUE, N° 387-388-389 (07-08-09-10/2014)  

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Réglementation cosmétique : le défi des nanomatériaux / Christian Gimenez in EXPRESSION COSMETIQUE, N° 22 (07-08/2013)  

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Structure et dynamique de l'eau confinée dans les matériaux géologiques / Eric Ferrage in L'ACTUALITE CHIMIQUE, N° 413 (12/2016)

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The critical role of particle size distribution in inkjet ink performance / Anne Virden in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 207, N° 4631 (05/2017)  

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The importance of hydration / Tobias Dorn in EUROPEAN COATINGS JOURNAL (ECJ), N° 9 (09/2019)  

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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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