Accueil
Résultat de la recherche
3 résultat(s) recherche sur le tag 'topographie'
Ajouter le résultat dans votre panier Affiner la recherche Générer le flux rss de la recherche
Partager le résultat de cette recherche
Effect of cellulase enzyme on cellulose nano-topography / A. Calvimontes in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 46, N° 6/2009 (11-12/2009)
[article]
Titre : Effect of cellulase enzyme on cellulose nano-topography Type de document : texte imprimé Auteurs : A. Calvimontes, Auteur ; M. Stamm, Auteur ; V. Dutschk, Auteur Année de publication : 2009 Article en page(s) : p. 368-372 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants Tags : Cellulose Enzyme cellulase Celluclean Cellophane Topographie Morphologie Porosité Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : In this study, modification effects of cellulose foil by cellulase enzyme are studied in respect to topography changes by means of atomic force microscopy (AFM). The results provide useful information to understand the enzyme action in the amorphous and crystalline regions of cellulose. It was revealed, that the treatment of cellulose with the cellulase enzyme depends on its concentration, which selectively attacks amorphous cellulose regions. At lower concentration, a random surface roughening of the cellulose foil was observed. With increasing enzyme concentration, the cellulose surface became smoother. On the basis of this knowledge, a conceptual model to describe the conditioning effect by cellulase on the cleanability of cotton fabrics was developed. With the help of this model, we are able to estimate changes in the nanoporosity of cotton fibres. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6812
in TENSIDE, SURFACTANTS, DETERGENTS > Vol. 46, N° 6/2009 (11-12/2009) . - p. 368-372[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 011757 - Périodique Bibliothèque principale Documentaires Disponible Nano-mechanical properties and topography of thermosetting acrylic powder coatings / D. C. Andrei in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 912 (01/2001)
[article]
Titre : Nano-mechanical properties and topography of thermosetting acrylic powder coatings Type de document : texte imprimé Auteurs : D. C. Andrei, Auteur ; D. Parsonage, Auteur ; B. J. Briscoe, Auteur ; S. G. Yeates, Auteur ; J. N. Hay, Auteur ; Joseph L. Keddie, Auteur Année de publication : 2001 Article en page(s) : p. 65-73 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau revêtement Peinture poudre Propriété mécanique Feuil Structure surface Thermodurcissable Acrylique dérivé polymère Résistance rayure Vernis Dureté Microdureté Module élasticité Topographie Etude expérimentale Index. décimale : 667.9 Revêtements et enduits Résumé : Both nano-scratching and nano-indentation techniques have been used to evaluated the mechanical properties of the surface of acrylic coatings, with and without added pigment. The coatings were formed from thermosetting, acrylic powders. Both types of coatings-clear and pigmented-do not exhibit any significant differences in their hardness with an increase in baking time from 7 to 15 min. According to the scratching profiles, the deformation induced at the surface is virtually elastic. Introducing the pigment causes a slight increase in the elastic modulus but not significant variation in hardness. In all coatings, the computed hardness and the elastic modulus vaues are higher near the surface (perhaps as a result of tip geometry effects), but these readily reach plateau values that are consistent with other work available in the literature. A long-range surface profiler, which provided two-dimensional and three-dimensional topographical maps of the coatings surfaces, reveals undulations in the surface with a wavelength on the order of 2-4 mm. Moreover, the topography of the pigmented coating is significantly smoother than that of the clear coating in which shallow pits (about 100 µm in diameter) are randomly distributed at the surface. The nano-mechanical properties within these pits are similar to the bulk of the coating. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5688
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 912 (01/2001) . - p. 65-73[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 001220 - Périodique Bibliothèque principale Documentaires Disponible Relating gloss loss to topographical features of a PVDF coating / Jenny Faucheu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 3, N° 1 (01/2006)
[article]
Titre : Relating gloss loss to topographical features of a PVDF coating Type de document : texte imprimé Auteurs : Jenny Faucheu, Auteur ; Kurt A. Wood, Auteur ; Li-Piin Sung, Auteur ; Jonathan W. Martin, Auteur Année de publication : 2006 Article en page(s) : p. 29-39 Note générale : bibliogr. Langues : Américain (ame) Tags : Amérique du Nord Etats Unis Propriété chimique surface esthétique Etude expérimentale Diffusion lumière Faisceau laser Microscopie confocale Méthode analyse Relation structure propriété Floride Vieillissement produit Résistance intempérie Durabilité Polymère fluor Dégradation photochimique Rugosité Topographie Matériau revêtement Vinylidène fluorure polymère Brillant Index. décimale : 667.9 Revêtements et enduits Résumé : Semi-gloss commercial poly(vinylidene fluoride) (PVDF) coatings typically have 60° gloss values between 20 and 50. Gloss is affected by PVDF crystallite structures and by the pigmentation. In this article, we have demonstrated that for some pigmented PVDF coatings, after 10 years of Florida exposure, the principal proximal cause of gloss changes is the formation of micron-scale pits, rather than the emergence of pigment particles at the coating surface. We have used laser scanning confocal microscopy (LSCM) and light scattering to characterize the surface topography and near-surface structure of weathered and unweathered PVDF coatings. Florida-weathered PVDF coatings show only a modest increase in the root mean square (RMS) roughness of the surface, even when noticeable gloss loss has occurred. Changes in gloss can be correlated with surface roughness and other topographical features, including the formation of pits and the emergence of pigments. DOI : 10.1007/s11998-006-0003-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-006-0003-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3710
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 3, N° 1 (01/2006) . - p. 29-39[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 003762 - Périodique Bibliothèque principale Documentaires Disponible