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The influence of barrier pigments in waterborne barrier coatings on cellulose nanofiber layers / Mohammed Al-Gharrawi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 3-14 Titre : The influence of barrier pigments in waterborne barrier coatings on cellulose nanofiber layers Type de document : texte imprimé Auteurs : Mohammed Al-Gharrawi, Auteur ; Rachel Ollier, Auteur ; Jinwu Wang, Auteur ; Douglas W. Bousfield, Auteur Année de publication : 2022 Article en page(s) : p. 3-14 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aliments -- Emballages Cellulose La cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules. Eléments finis, Méthode des Matériaux -- Propriétés barrières Nanofibres Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Layers of cellulose nanofibers (CNF) have great potential to be used in food packaging applications because of their oxygen and grease barrier properties. However, because of their sensitivity to moisture, they likely will need to be used in a layered structure with water vapor barrier layers. Waterborne barrier coatings (WBBC) have the potential to provide this water vapor barrier, but their performance on paper with a CNF layer has not been described in the literature. Paper that had a CNF layer was coated with three different WBBC with various levels of two different barrier pigments to improve the water vapor barrier properties of these systems. The effective diffusion coefficient of these systems was obtained by fitting the data to a two-layer diffusion model. A finite element code was used to predict the flux rate of water vapor through the barrier layers in the presence of a barrier pigment. The dangers of samples “blocking” in production have been tested as well as grease barrier properties. The presence of the CNF layer on paper is shown to improve the performance of the water vapor barrier layer, in some cases, by a factor of six. Adding barrier pigment to the WBBC improves barrier properties at low concentration by 15%, but as the concentration of pigment increases, the barrier properties decrease. The water vapor transmission rate does not decrease to the same order of magnitude as expected from simple theoretical models and the finite element calculations. This result likely is linked to fine bubbles in the coatings that are hard to remove or other defects that are generated during coating or drying. Barrier pigments remove concerns around blocking. All samples had good grease barrier properties. Note de contenu : - Table 1 : Ranking system for blocking test - Table 2 : The values of effective moisture diffusion coefficient Dc in coatings obtained from fitting equation (1) for various pigment types and concentrations for polymers A, B, C. Values are in m2/s × 1010 DOI : https://doi.org/10.1007/s11998-021-00482-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00482-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37140 [article]

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Drying paths of phase-separating solution coatings exposed to humidity / Masato Yamamura in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 15-23 Titre : Drying paths of phase-separating solution coatings exposed to humidity Type de document : texte imprimé Auteurs : Masato Yamamura, Auteur Année de publication : 2022 Article en page(s) : p. 15-23 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Azéotropes Diagrammes de phases Humidité -- Absorption:Eau -- Absorption Revêtement -- Séchage Séparation (technologie) Simulation par ordinateur Vapeur d'eau Index. décimale : 667.9 Revêtements et enduits Résumé : Drying process paths, i.e., time-dependent trajectories of solution compositions on a phase diagram, were examined for coatings of a water-immiscible acrylic monomer dissolved in ethanol and exposed to humidity. The absorption of water vapor quenched the solution into a thermodynamic nonequilibrium state and promoted a spontaneous phase separation when the water content in the solution exceeded a critical value. A simultaneous mass-loss and heat-flux measurement technique was proposed and adapted for phase-separating coatings to determine the evaporation rates of two volatile components with different latent heats of vaporization. The measured drying paths agreed with those predicted from a drying model that takes into account the gas-diffusion-limited evaporation and composition-dependent activities. The numerical predictions also revealed that the pseudo-azeotrope determined the critical drying conditions, under which any drying paths on the phase diagram did not cross the two-phase region, and thus the drying solutions remained stable. DOI : https://doi.org/10.1007/s11998-021-00483-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00483-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37141 [article]

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Modeling the penetration of polymer into paper during extrusion coating / Mubarak Khlewee in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 25-34 Titre : Modeling the penetration of polymer into paper during extrusion coating Type de document : texte imprimé Auteurs : Mubarak Khlewee, Auteur ; Mohammed Al-Gharrawi, Auteur ; Doug Bousfield, Auteur Année de publication : 2022 Article en page(s) : p. 25-34 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Enduction Extrusion (mécanique) Fibres cellulosiques Modèles mathématiques Nanofibres Papier -- Revêtements Papier et carton couché Pénétration (physique) Polyéthylène Revêtements organiques Thermocinétique Index. décimale : 667.9 Revêtements et enduits Résumé : During the extrusion coating of paper or paperboard, a molten film of polymer is pressed against a paper surface to generate waterproof packaging materials. Hot-melt glues are also applied to various porous materials and paperboard to generate packaging. In both cases, the penetration of the polymer into the pore space influences the product performance and the ability of the product to be recycled at the end of life. While there is much experimental work discussing various parameters in these operations, little theoretical work has been reported. Here, a simple model based on Darcy’s law is proposed to predict the penetration of polyethylene (PE) into paper and paper that has been coated with cellulose nanofibers (CNF). Another model, based on the flow of a polymer into a pore that includes dynamic heat transfer is developed, where the viscosity is a function of temperature. Experiments were conducted where a PE film is pressed against samples and the amount of fiber recovery is characterized. The model predictions are compared to experimental results. Good agreement for different paper types, pressing times, and temperatures is obtained after a calibration factor is used. DOI : https://doi.org/10.1007/s11998-021-00487-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00487-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37142 [article]

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Operability limits for non-Newtonian liquids in dual-layer slot coating processes using the viscocapillary model / Jin Seok Park in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. pages 35-47 Titre : Operability limits for non-Newtonian liquids in dual-layer slot coating processes using the viscocapillary model Type de document : texte imprimé Auteurs : Jin Seok Park, Auteur ; Taehyung Yoo, Auteur ; Kwan-Young Lee, Auteur ; Hyun Wook Jung, Auteur Année de publication : 2022 Article en page(s) : p. pages 35-47 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cisaillement (mécanique) Enduction par filière Enrobage (technologie) Fluides non newtoniens Revêtements Rhéologie Tags : 'Revêtement  de  fente  à  double  couche'  Cisaillement  'Modèle  viscocapillaire'  'Invasion  mi-chemin'  'Limites  d'opérabilité' Index. décimale : 667.9 Revêtements et enduits Résumé : The operability windows and coating bead dynamics for the dual-layer slot coating process with non-Newtonian coating liquids were investigated using the viscocapillary model, a two-dimensional (2D) CFD simulation, and experiments. The simplified viscocapillary model derived from the 2D equation of motion with the shear-thinning Carreau liquids bounds the uniform coating regime without defects such as leaking, bead break-up, and mid-gap invasion in dual-layer coating systems. The coating bead flows from experiments and finite-volume-based 2D simulations with the volume-of-fluid scheme demonstrate the performance of the viscocapillary model in reliably tracking the upstream meniscus position of the bottom layer in the coating bead region. The onset of leaking, bead break-up, and mid-gap invasion defects is strongly affected by the rheological properties of Carreau-type coating liquids and the flow ratio between the top and bottom layers. In particular, the relative thickness of the shear-thinning bottom layer at the onset of mid-gap invasion is smaller than the well-known 1/3 value in the Newtonian case, depending on the degree of shear thinning. Note de contenu : - Viscocapillary model for non-Newtonian dual-slot coating flow - Experimental methods - CFD simulations - Results and discussion : Comparison of operability limits and coating bead dynamics - Effect of the flow ratio on the operability limits - Effect of rheological properties of coating liquids in the model DOI : https://doi.org/10.1007/s11998-021-00499-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00499-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37143 [article]

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An overview of planar flow casting of thin metallic glasses and its relation to slot coating of liquid films / Eric A. Theisen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 49-60 Titre : An overview of planar flow casting of thin metallic glasses and its relation to slot coating of liquid films Type de document : texte imprimé Auteurs : Eric A. Theisen, Auteur ; Steven J. Weinstein, Auteur Année de publication : 2022 Article en page(s) : p. 49-60 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alliages Coulée à flux planaire Défauts Enduction par filière Matériaux amorphes Index. décimale : 667.9 Revêtements et enduits Résumé : Planar flow casting (PFC) is a method that can be used to make thin, long, and wide metallic alloy foils by extruding molten liquid through a nozzle slot and immediately quenching on a moving roller. The quenching rates are high enough that amorphous metallic glasses may be formed that have many desirable properties for a wide variety of applications. This paper reviews how PFC processes were developed, examines the typical operability range of PFC, and reviews the defects that commonly form. The geometrical similarities between PFC and slot coating process are apparent, and this paper highlights differences between the operability ranges of both processes. Note de contenu : - Thin metallic glass processing and the development of planar flow casting - Planar flow casting (PFC) process conditions - Defect formation : Defects arising from casting wheel - Flow related defects - Comparison of planar flow casting (PFC) and conventional slot coating - Table 1: PFC process conditions for the Cornell aluminum-silicon (Al-Si)-based crystalline foils, obtained via batch casting, and the Metglas iron (Fe)-based amorphous foils, obtained via continuous casting DOI : https://doi.org/10.1007/s11998-021-00503-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00503-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37144 [article]

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The effect of yielding of dense silica slurry on the uniformity of coated layer / Yoshiyuki Komoda in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 61-72 Titre : The effect of yielding of dense silica slurry on the uniformity of coated layer Type de document : texte imprimé Auteurs : Yoshiyuki Komoda, Auteur ; Takanobu Hira, Auteur ; Hideki Kojo, Auteur ; Hidenobu Miura, Auteur ; Yusuke Shibata, Auteur ; Kenji Udaka, Auteur ; Atsushi Watanabe, Auteur ; Kosuke Suzuki, Auteur Année de publication : 2022 Article en page(s) : p. 61-72 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Cisaillement (mécanique) Colloides Dispersions et suspensions Polyacétate de vinyle Rhéologie Silice pyrogénée La silice pyrogénée (numéro CAS 112945-52-5, fumed silica en anglais) est une forme de dioxyde de silicium, ou silice, de formule chimique SiO2. Elle se présente comme une poudre constituée de gouttelettes de silice fondue refroidies en formant des chaînes tridimensionnelles qui s'organisent en particules de matière amorphe de très faible masse volumique apparente et de surface spécifique très élevée. Cette structure particulière entraîne un comportement thixotrope accroissant la viscosité des substances dans lesquelles elle est utilisée comme épaississant ou comme charge dans les matières plastiques. Applications : La silice pyrogénée est un épaississant et un anti-agglomérant largement utilisé dans les poudres. Comme le gel de silice, elle peut être utilisée comme absorbeur d'humidité. On la retrouve dans les cosmétiques du fait de ses propriétés de diffusion de la lumière. Elle est utilisée comme abrasif doux dans le dentifrice, comme charge dans les élastomères en silicone et pour l'ajustement de la viscosité de peintures, revêtements, encres, adhésifs et résines de polyesters insaturés. (Wikipedia) Viscoélasticité Index. décimale : 667.9 Revêtements et enduits Résumé : The effect of shearing conditions in the coating process on the uniformity of the coated layer of dense silica slurry is investigated. The pH 6.8 test slurry mainly used in this study forms a nonuniform coated layer only on the condition of large shear strain and low shear rate. The same shearing dependency was observed using not only a laboratory-scale doctor blade but also a pilot-scale comma coater. The test slurry exhibits two-step yielding, and the internal structure of the slurry is gradually destroyed after the second yielding. When the shear strain applied is within the second yielding, the test slurry is in equilibrium and a uniform coated layer is formed. As strain is increased further, the slurry changes from the viscoelastic fluid to Newtonian. When the shear strain is beyond the second yielding but the structural destruction is not completed, a nonuniform coated layer is formed. A higher coating speed or sufficiently large shear deformation, which effectively destroys the internal structure, is favorable to obtain a uniform coated layer. Note de contenu : - Materials and experimental methods : Materials - Rheological characterization of test slurry - Coating experiment - Results and discussion : Effect of experimental conditions on the appearance of coated layer - Analysis of nonlinear stress response with large amplitude oscillatory shear DOI : https://doi.org/10.1007/s11998-021-00507-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00507-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37145 [article]

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Process model for multilayer slide coating of polymer electrolyte membrane fuel cells / Kristianto Tjiptowidjojo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 73-81 Titre : Process model for multilayer slide coating of polymer electrolyte membrane fuel cells Type de document : texte imprimé Auteurs : Kristianto Tjiptowidjojo, Auteur ; Janghoon Park, Auteur ; Scott A. Mauger, Auteur ; Michael Ulsh, Auteur ; Peter Randall Schunk, Auteur Année de publication : 2022 Article en page(s) : p. 73-81 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Eléments finis, Méthode des Encre Equations Fluides, Mécanique des Piles à combustible Revêtements multicouches Slide coating Index. décimale : 667.9 Revêtements et enduits Résumé : Slide coating is a precision method suitable for depositing multiple liquid-film layers simultaneously. Originally developed in the photographic film industry, it has been deployed for manufacturing of other products that benefit from multilayer coatings. One emerging application is the manufacture of polymer electrolyte membrane fuel cells (PEMFCs), which are used to produce electricity through electrochemical reactions of hydrogen and oxygen gas. The membrane-electrode assembly (MEA), in which key electrochemical reactions occur, consists of three layers that are typically deposited separately in serial fashion and then laminated together to form the three-layer MEA, i.e., three sequential steps of coat and dry. Adapting the process to simultaneous, multilayer slide coating of all three layers will save equipment cost and space while minimizing possible exposure to contaminants during transition between the steps. We are developing a three-layer slide coating model to aid the manufacturing process design of PEMFC. The model accounts for rheology of each layer, which typically exhibit shear thinning behavior. Model predictions are used to investigate simultaneous coatability of catalyst inks and to determine the best layer-by-layer ink selection. Note de contenu : - Governing equations and solution method - Table 1 Geometry description of slide die used in this study. Refer to Fig. 1 for the nomenclature - Table 2 Physical properties of inks used in the slide coating flow model. No surface tension and contact angles values needed for Nafion due to being in the middle layer DOI : https://doi.org/10.1007/s11998-021-00508-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00508-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37146 [article]

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Machine learning workflow for microparticle composite thin-film process–structure linkages / Peter R. Griffiths in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. pages 83-96 Titre : Machine learning workflow for microparticle composite thin-film process–structure linkages Type de document : texte imprimé Auteurs : Peter R. Griffiths, Auteur Année de publication : 2022 Article en page(s) : p. pages 83-96 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Apprentissage automatique L'apprentissage automatique (en anglais : machine learning, litt. "apprentissage machine"), apprentissage artificiel ou apprentissage statistique est un champ d'étude de l'intelligence artificielle qui se fonde sur des approches mathématiques et statistiques pour donner aux ordinateurs la capacité d'"apprendre" à partir de données, c'est-à-dire d'améliorer leurs performances à résoudre des tâches sans être explicitement programmés pour chacune. Plus largement, il concerne la conception, l'analyse, l'optimisation, le développement et l'implémentation de telles méthodes. (Wikipedia) Composites Couches minces Microstructures Particules (matières) Polymères Index. décimale : 667.9 Revêtements et enduits Résumé : Microparticle composite thin films (MCTFs) have applications in a variety of fields, ranging from water filtration, to advanced energy storage, to medical devices. Variations in processing parameters during casting and solidification have been demonstrated to lead to morphological and therefore property changes in the final film. However, the wide range and number of possible combinations of parameters can make robust process–structure (PS) linkages a complex problem. Material informatics has shown to be well suited for developing PS linkages in other materials, but there are challenges that must first be addressed for MCTFs given the lack of separation between the characteristic length scales of the microstructure (i.e., particles, pores, etc.) and the film thickness. The objective of this work is to identify reduced-order spatial models and machine learning algorithms to address these problems. To achieve this, simulated microstructures of microparticle distributions based upon slot die coating simulations have been generated. Reduced-order representations of the microstructures were then created to capture variation in the microstructure across small slices through thickness of the film using two-point particle autocorrelation statistics and principal component analysis. Results showed that predictive PS linkages can be created using Gaussian process regression between the final film morphology and processing parameters; however, image size must be considered to ensure convergence in spatial statistics to increase accuracy. Note de contenu : - Methods : Simulated microstructures - Spatial statistical models : two-point spatial statistics and principal component analysis - Process–structure linkages - Results and discussion : Microstructure generation - Spatial statistical model - Process–structure linkages - Table 1 : Microstructure dataset parameter ranges DOI : https://doi.org/10.1007/s11998-021-021-00512-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00512-x.pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37147 [article]

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Numerical modeling of the spray/spin coating of the interior of metal beverage cans : complete three-dimensional simulation / David E. Weidner in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. pages 97-109 Titre : Numerical modeling of the spray/spin coating of the interior of metal beverage cans : complete three-dimensional simulation Type de document : texte imprimé Auteurs : David E. Weidner, Auteur Année de publication : 2022 Article en page(s) : p. pages 97-109 Note générale : Bibliogr. Langues : Américain (ame) Catégories : canettes Dépôt par pulvérisation Modèles numériques Revêtement par centrifugation Simulation par ordinateur Index. décimale : 667.9 Revêtements et enduits Résumé : In this work we develop a numerical simulation of the spray coating of spinning beverage cans. Though the substrate of the can must be axisymmetric, the coating need not be. We start with an evolution equation, which was derived using scaling arguments and perturbation theory. We then use implicit finite differences and an ADI scheme, with periodic boundary conditions, to efficiently solve the problem numerically. The spray fan is modeled as an expanding ellipse, and we use parameters typical of the coating industry in our simulations. The simulations show that if the can rotates an exact integral number of rotations during the spray process, then the coating layer is almost axisymmetric. But when this cannot be achieved, then three-dimensional effects greatly change the coating dynamics of the thin liquid film and must be included in the analysis. Note de contenu : - Previous work - Derivation of fundamental equations - Spray fan and can geometry - Nondimensionalization - Numerical aspects - Results - Table 1 : Dimensional parameters for this simulation - Table 2 : Nondimensional parameters for this simulation DOI : https://doi.org/10.1007/s11998-021-00517-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00517-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37148 [article]

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Simulation of slot-coating of nanocellulosic material subject to a wall-stress dependent slip-velocity at die-walls / P. A. Fuaad in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 111-120 Titre : Simulation of slot-coating of nanocellulosic material subject to a wall-stress dependent slip-velocity at die-walls Type de document : texte imprimé Auteurs : P. A. Fuaad, Auteur ; Agne Swerin, Auteur ; Fredrik Lundell, Auteur ; Martti Toivakka, Auteur Année de publication : 2022 Article en page(s) : p. 111-120 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cellulose La cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules. Enduction par filière Formulation (Génie chimique) Nanoparticules Revêtements organiques Rhéologie Tags : 'Enduction  filière'  'Modèle  Casson'  'Glissement  non  linéaire'  Nanocellulose Index. décimale : 667.9 Revêtements et enduits Résumé : Bio-based nanocellulosic materials are non-toxic, renewable, exhibit excellent barrier properties, and are suitable candidates for sustainable food packaging applications. Sizing and designing coating parameters for slot-coating process using nanocellulose suspensions is challenging due to complex shear-thinning rheology and the presence of a water-rich boundary layer, effecting significant apparent slip at the wall. Previous studies have shown that the flow inside the coating bead can be complex, with occasional stagnation regions and a rheological model incorporating yield stress which should be considered while analyzing slot coating of nanocellulosic flows. This work extends earlier investigations by including the effects of the particle depleted water-rich boundary layer. The suspension is modeled as a Casson fluid with a shear-thinning viscosity, and the particle depletion at the wall is represented by an infinitely thin layer modeled as a local shear-dependent nonlinear slip law. The resulting two-phase flow equations are solved using a Finite Volume Method (FVM) coupled with the Volume of Fluid (VoF) method for tracking the free surface interface. It is observed that slip alters the flow’s dynamics in the coating bead, and the effect of slip cannot be ignored, especially at high shear rates. For thin films, the presence of slip enhances the flow, leading to more material coated on the substrate. In contrast, for thicker coatings, apparent slip leads to an augmentation in stagnant, non-yielded regions, potentially generating uneven surfaces. Note de contenu : - Mathematical formulation - Numerical solution - Table 1 Operating parameters DOI : https://doi.org/10.1007/s11998-021-00516-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00516-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37149 [article]

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Investigation of edge formation during the coating process of Li-ion battery electrodes / Sandro Spiegel in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) Titre : Investigation of edge formation during the coating process of Li-ion battery electrodes Type de document : texte imprimé Auteurs : Sandro Spiegel, Auteur ; Thilo Heckmann, Auteur ; Andreas Altvater, Auteur ; Ralf Diehm, Auteur ; Philip Scharfer, Auteur ; Wilhelm Schabel, Auteur Année de publication : 2022 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Accumulateurs lithium-ion Caractérisation Electrodes Enduction par filière Enrobage (technologie) Formulation (Génie chimique) Mélange Index. décimale : 667.9 Revêtements et enduits Résumé : In this manuscript, a method to reduce superelevations of lateral edges in cross-web direction during slot die coating of shear-thinning slurries for Li-ion battery electrodes (LIB) was developed. Therefore, the impact of the inner slot die geometry on the edge elevations was investigated. These elevations of the coating could be almost eliminated by optimizing the flow profile at the outlet of the slot die by modification of the internal geometry. This adaption is an essential step in optimizing the coating quality of slot die coating for battery electrodes to significantly reduce coating edges and, hence, the resulting production reject during the coating step of the industrial roll-to-roll process. It was also shown that lateral edges of the coating can be influenced explicitly by process parameters such as volume flow and gap between slot die and substrate. This correlation has already been shown for other shear-thinning material systems in previous works, which is now confirmed for this material system. At the beginning, the influence of different internal geometries on the formation of the edge elevations was shown. Finally, for the shear-thinning electrode slurry used in this work, optimal dimensions of the previously determined inner geometry for the slot die outlet were found. The optimization was performed for a state-of-the-art electrode area capacity (approximately 2.2 mAh cm−2). The results enable a significant reduction of defects and reject in the coating step of large-scale production of LIB electrodes in the future, adding to a more sustainable battery production. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Formulation, mixing, and preparation - Experimental setup and process parameters - Characterization methods - RESULTS AND DISCUSSION : Influence of coating speed - Influence of dimensionless gap - Influence of shim geometries - Table 1 Composition of the solid components of the anode slurry - Table 2 Process parameters and geometrical parameters used in the experiments for the different shim configurations DOI : https://doi.org/10.1007/s11998-021-00521-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00521-w.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37150 [article]

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Avoiding surface instability and slurry jamming in simultaneous multilayer coating of structured particulate films / J. Alex Lee in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 131–142 Titre : Avoiding surface instability and slurry jamming in simultaneous multilayer coating of structured particulate films Type de document : texte imprimé Auteurs : J. Alex Lee, Auteur ; Aaron Kessman, Auteur ; David Shackleford, Auteur ; Martin Z. Bazant, Auteur ; Brian Barry, Auteur ; Courtland Chapman, Auteur ; Jeff Peet, Auteur Année de publication : 2022 Article en page(s) : p. 131–142 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Piles à combustible Revêtements multicouches Tags : 'Revêtement  multicouche'  'Glissière  'Emplacement  double  couche'  Instabilité  Boue  Aqueux  'Système  miscible'  'Épaississement  par  cisaillement'  Marangoni  SOFC  'Pile  à  combustible'  Diffusion Index. décimale : 667.9 Revêtements et enduits Résumé : Simultaneous multilayer coating techniques are widely known, but their industrial application remains limited to narrow market sectors. One barrier to adoption may be the mismatch between industries that are familiar with such processes but have no need, and industries that have need but are not familiar. Moreover, there are application-specific technical challenges to developing multilayer-coating processes. In this article, we describe our resolution of two specific issues in simultaneous multilayer coating of all-aqueous highly loaded slurries for new and emerging energy applications. The first issue is particle jamming (associated with shear-thickening) of the highly loaded slurries in the die internals, which we alleviated by adding small amounts of viscosity modifiers without reducing the solid loading. The second issue is a Marangoni-driven surface instability that resembles top layer de-wetting, which we solved by carefully selecting surfactants to tune the dynamic surface tensions of each slurry. Both issues were resolved early in a step-wise development, saving significant development cost which in our case was driven by expensive materials. Note de contenu : - SLURRY JAMMING ASSOCIATED WITH SHEAR-THICKENING : Relevant literature on shear-thickening - Elimination of shear-thickening and jamming - Discussion of slurry jamming and rheology - SURFACE INSTABILITY RESEMBLING TOP LAYER DE-WETTING : Spreading and the surface tension grading rule - Marangoni-driven self-thinning film flows - Relationship between surface tension grading and Marangoni instability - The role of dynamic surface tension in the Marangoni instability - Elimination of surface instability in simultaneous multilayer coating - Discussion on DST grading and mechanisms of multilayer coating instability - Table 1 : Reformulation attempts to suppress shear-thickening - Table 2 : Equilibrium surface tensions with air (EST) of incumbent and reformulated slurries’ supernatants. Measured by Biolin Attension Theta tensiometer at 22°C - Table 3 : Comparison of EST and DST at different surface ages for different surfactants. Parentheses indicate difference from the value of S5 DOI : https://doi.org/10.1007/s11998-021-00542-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00542-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37151 [article]

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Flow stabilization and coating thickness reduction through use of multi-slot air-knife in gas jet wiping / J. R. McDermid ; Andrew N. Hrymak ; F. E. Goodwin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 143-158 Titre : Flow stabilization and coating thickness reduction through use of multi-slot air-knife in gas jet wiping Type de document : texte imprimé Auteurs : J. R. McDermid, Auteur ; Andrew N. Hrymak, Auteur ; F. E. Goodwin, Auteur Année de publication : 2022 Article en page(s) : p. 143-158 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Fluides, Mécanique des Galvanisation Matériaux -- Epaisseur Revêtements Tags : 'Balayage  au  jet  de  gaz'  'Réduction  l'épaisseur  du  revêtement'  'Lame  d'air  multi-fentes'  'Galvanisation  à  chaud  continue'  'Modélisation  des  turbulences'  'Mesures  d'épaisseur Index. décimale : 667.9 Revêtements et enduits Résumé : This paper investigates the gas jet wiping process, which is widely employed for controlling the final zinc-alloy coating thickness of a moving steel strip in the continuous hot-dip galvanizing process. In this study, large eddy simulation (LES) was employed to determine the effect of lower velocity symmetric auxiliary jets on main jet stabilization and coating thickness reduction during the gas jet wiping process. For validation purposes, experimental measurements of coating thickness were also carried out for the prediction of final coating thickness via a novel prototype multi-slot air knife used as the wiping actuator. Good agreement was found between the experimental measurements and model predictions for the coating weight, which also confirmed the applicability of the Elsaadawy et al.1 model for the prediction of final coating weight for the multi-slot air knife geometry used. It was found that the jet flapping observed during single jet wiping could be prevented through use of the multi-slot air knife operating with lower velocity symmetric auxiliary jets (Rea/Rem =  0.45) situated on both sides of the main jet. The auxiliary jets modified the flow field in the main jet shear layer and diminished the formation of alternating vortices, which are the main cause of jet flow oscillations. As a result, a stabilized impinging flow with a longer potential core was found for the multi-slot jet configuration. This led to increased pressure gradient and increased shear stresses in the vicinity of the wiping region and, consequently, lower coating weights were obtained through use of the multi-slot air knife compared to the conventional single slot jet. Note de contenu : - Analytical model of film thickness - Experimental setup - Numerical simulation - Results and discussion - Table 1 : Working liquid properties in the experimental facility DOI : https://doi.org/10.1007/s11998-021-00570-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00570-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37152 [article]

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Recent advances in steel surface treatment via novel/green conversion coatings for anti-corrosion applications : a review study / M. H. Shahini in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 159-199 Titre : Recent advances in steel surface treatment via novel/green conversion coatings for anti-corrosion applications : a review study Type de document : texte imprimé Auteurs : M. H. Shahini, Auteur ; H. Eivaz Mohammadloo, Auteur Année de publication : 2022 Article en page(s) : p. 159-199 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique. L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1. C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple. Anticorrosion Cerium Chrome trivalent Lanthane Le lanthane est un élément chimique, de symbole La et de numéro atomique 57. Le lanthane a donné son nom à la famille des lanthanides qui font partie des terres rares. Son nom dérive du mot grec "lanthanein", ce qui signifie "cacher" : le lanthane est resté longtemps caché dans l'oxyde de cérium. À température ambiante le lanthane est un métal gris argent, malléable, ductile, assez mou pour être coupé au couteau. Il s'oxyde à l'air et dans l'eau. Métaux -- Revêtements protecteurs Molybdate Un molybdate est une espèce chimique qui contient un oxyanion possédant un atome de molybdène à son nombre d'oxydation maximum de +6. Le molybdène peut former une grande variété d'oxyanions, qui peuvent se présenter comme des structures discrètes ou bien des structures étendues polymérisées, ces dernières ne se trouvant qu'à l'état solide. Les oxyanions de molybdène discrets vont du MoO42–, qu'on trouve par exemple dans le molybdate de sodium Na2MoO4, jusqu'aux très grandes structures telles que le bleu de molybdène [Mo154O462H14·70H2O]14− dit « hétéropolymolybdène ». Parmi les éléments du groupe 6 du tableau périodique, le molybdène a un comportement voisin de celui du tungstène1 mais très différent de celui du chrome, qui ne forme que les chromates CrO42–, Cr2O72–, Cr3O102– et Cr4O132– qui ont tous une géométrie tétraédrique. Néodyme Le néodyme est un élément chimique, de symbole Nd et de numéro atomique 60. C'est un métal gris argent du groupe des terres rares. Il fait partie de la famille des lanthanides. À température ambiante, il est ductile, malléable et s'oxyde rapidement à l'air. Silanes Titane Zirconium Résumé : Replacing the chromate and phosphate conversion coatings (CCs) with nontoxic ones has played a key role in CC research in recent years. Although considerable efforts have been devoted to discovering and modifying the toxic CC alternatives, much of the research has been restricted to a few numbers of green CCs. The present study has aimed to review the recent attempts that have been made in this area of research to address the toxicity issue of CCs, with a focus on the steel substrate. It includes investigations on different CCs: cerium (CeCC), neodymium (NdCC), lanthanum (LaCC), zirconium (ZrCC), titanium (TiCC), trivalent chromium (TCC), molybdate (MoCC), silicate (SiCC), and silane (SilCC). Surface studies, electrochemical measurements, CCs’ comparison, and film formation mechanisms were summarized. Imparting adhesion to the steel/organic coating interface or the delamination of the organic coating was discussed. Moreover, the influence of several steel substrates (coated and uncoated) and solution parameters (pH, temperature, concentration, stirring, and immersion time) on the CCs properties were outlined. Various methods (such as additives, heat treatment, and subsequent film treatment) that have been employed to improve the green CCs properties and make them comparable to their harmful counterparts were explored. Note de contenu : - Trivalent chromium CC (TCC) : Formation mechanism - Influencing factors - Properties and comparison - Rare earth element (REE) CCs : Cerium CC (CeCC) - Neodymium CC (NdCC) - Lanthanum CC (LaCC) - REE comparison - Zirconium CC (ZrCC) : Formation mechanism - Properties and comparison - Titanium CC (TiCC) : Formation mechanism - Influencing factors - Properties and comparison - Molybdate CC (MoCC) : Film formation - Properties and comparison - Silicate CC (SiCC) : Formation mechanism - Influencing factors - Properties and comparison - Silane CC (SilCC) : Formation mechanism - Properties and comparison DOI : https://doi.org/10.1007/s11998-021-00466-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00466-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37153 [article]

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Polyols and polyurethanes from renewable sources : past, present and future—part 1 : vegetable oils and lignocellulosic biomass / Ritesh S. Malani in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 201-222 Titre : Polyols and polyurethanes from renewable sources : past, present and future—part 1 : vegetable oils and lignocellulosic biomass Type de document : texte imprimé Auteurs : Ritesh S. Malani, Auteur ; Vinod C. Malshe, Auteur ; Bhaskar Narayan Thorat, Auteur Année de publication : 2022 Article en page(s) : p. 201-222 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biomasse Biopolymères -- Synthèse Huiles et graisses végétales Isocyanates Lignocellulose Polymères -- Recyclage Polyols Polyuréthanes Ressources renouvelables Index. décimale : 667.9 Revêtements et enduits Résumé : Polyurethanes, a major class of polymers conventionally derived from petroleum products, find applications in numerous sectors. Limited fossil resources, their extensive usage, large carbon footprint and alarming environmental issues motivated the research community worldwide in finding alternate and renewable routes for one of the key raw materials, polyols and isocyanate precursors. There are several reports available in the literature showing the techno-economic viability of bio-based polyols and hence polyurethanes. This article summarizes the synthesis of renewable polyols and polyurethanes thereof through utilization of various renewable sources such as vegetable oils, lingo-cellulosic biomass and other feedstock. The polyols obtained from different starting materials lead to variation in hydroxyl number and ultimately have a profound impact on the properties of polyurethanes. Hydroxyl groups are further classified based on their presence in polyols. Primary hydroxyl groups present in polyols hold the mechanical and thermal performance of final polyurethanes better. In this context, the recent advancements in increasing the primary hydroxyl groups in bio-based polyols through different chemical transformation has been focused on here. Moreover, the developments in the synthesis of polyurethane foam without the use of isocyanates have been considered as a green polymer. The ever-increasing demand in the market and the high potential of renewable sources will lead to further advancement in commercialization of bio-based polyurethanes. Note de contenu : - Vegetable oil-derived polyols and polyurethane : Seed oils for PU synthesis having integral hydroxyl group - Seed oils for PU synthesis without hydroxyl group - Biomass-derived polyols and polyurethane : Lignocellulosic polyols from oxypropylation of lignin and corresponding PUs - Polyols from liquefaction of lignocellulosic biomass and corresponding PUs - Reusability and recycling of polyurethanes - Summary and future opportunities DOI : https://doi.org/10.1007/s11998-021-00490-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00490-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37154 [article]

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Modification of natural gums for application as corrosion inhibitor : a review / Nishad R. Vaidya in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 223-239 Titre : Modification of natural gums for application as corrosion inhibitor : a review Type de document : texte imprimé Auteurs : Nishad R. Vaidya, Auteur ; Pritish Aklujkar, Auteur ; Adarsh R. Rao, Auteur Année de publication : 2022 Article en page(s) : p. 223-239 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alginates L'acide alginique et ses dérivés (base conjuguée, sels et esters) les alginates sont des polysaccharides obtenus à partir d'une famille d'algues brunes : les laminaires ou les fucus. - COMPOSITION CHIMIQUE : L'alginate est un polymère formé de deux monomères liés ensemble : le mannuronate ou acide mannuronique dont certains sont acétylés et le guluronate ou acide guluronique. L'acide alginique permet la production de fibres d'alginates de sodium et de calcium. Les alginates alcalins forment dans l'eau des solutions colloïdales visqueuses. Si l'acide alginique est insoluble dans l'eau, l'alginate de sodium est lui très soluble dans l'eau, et l'alginate de calcium est seulement soluble en milieu basique, notamment en solutions de savon qui sont presque toujours assez alcalines. Les alginates peuvent former des gels durs et thermostables utilisés comme additifs alimentaires. - UTILISATIONS : Les alginates sont utilisés comme épaississants, gélifiants, émulsifiants et stabilisants de produits industriels les plus variés depuis les gelées alimentaires, les produits de beauté, jusqu'aux peintures et aux encres d'imprimerie. L'alginate de propane-1,2-diol (E405), ester de l'acide aliginique, est utilisé, par exemple, pour stabiliser des mousses (vinification, additif de bière, etc.), et est également utilisé dans un procédé de préparation de microcapsules. Anticorrosifs Anticorrosion Colophane La colophane est le résidu solide obtenu après distillation de la térébenthine, oléorésine (appelée aussi gemme), substance récoltée à partir des arbres résineux et en particulier les pins (le genre Pinus) par une opération que l'on appelle le gemmage. La colophane est solide et cassante à température ambiante. Sa couleur va du jaune très clair au quasi noir en fonction essentiellement de la conduite de la distillation, la couleur ou grade est défini par une échelle de lettre allant de D pour le plus foncé à X pour le plus clair. La colophane ne fond pas mais se ramollit avec la chaleur, son point de ramollissement se situant autour de 70 °C. Cette résine a les propriétés de coller et d'imperméabiliser. Elle fait partie des liants utilisés dans les antifoulings. La colophane est composée à 90% d’un mélange d’acides organiques de la famille des diterpènes appelés acides résiniques, qui répondent à la formule brute C20H30O2. Ces acides résiniques sont des isomères. La proportion des différents acides résiniques dans la colophane est variable suivant l’espèce de pin à partir de laquelle la colophane a été obtenue. Certains acides ne sont présents que chez certaines espèces (et leur sont donc caractéristiques). La colophane (ou « rosine ») a de nombreux usages. On la trouve notamment dans les peintures antifouling où elle se substitue au tributylétain interdit. C'est un irritant et un allergisant pour la peau et les voies respiratoires, sous forme pure ou par ses produits de dégradation. Gommes végétales Matériaux -- Modifications chimiques Métaux -- Revêtements protecteurs Polysaccharides Les polysaccharides (parfois appelés glycanes, polyosides, polyholosides ou glucides complexes) sont des polymères constitués de plusieurs oses liés entre eux par des liaisons osidiques. Les polyosides les plus répandus du règne végétal sont la cellulose et l’amidon, tous deux polymères du glucose. De nombreux exopolysaccharides (métabolites excrétés par des microbes, champignons, vers (mucus) du ver de terre) jouent un rôle majeur - à échelle moléculaire - dans la formation, qualité et conservation des sols, de l'humus, des agrégats formant les sols et de divers composés "argile-exopolysaccharide" et composites "organo-minéraux"(ex : xanthane, dextrane, le rhamsane, succinoglycanes...). De nombreux polyosides sont utilisés comme des additifs alimentaires sous forme de fibre (inuline) ou de gomme naturelle. Ce sont des polymères formés d'un certain nombre d'oses (ou monosaccharides) ayant pour formule générale : -[Cx(H2O)y)]n- (où y est généralement x - 1). On distingue deux catégories de polysaccharides : Les homopolysaccharides (ou homoglycanes) constitués du même monosaccharide : fructanes, glucanes, galactanes, mannanes ; les hétéropolysaccharides (ou hétéroglycanes) formés de différents monosaccharides : hémicelluloses. Les constituants participant à la construction des polysaccharides peuvent être très divers : hexoses, pentoses, anhydrohexoses, éthers d'oses et esters sulfuriques. Selon l'architecture de leur chaîne, les polysaccharides peuvent être : linéaires : cellulose ; ramifiés : gomme arabique, amylopectine, dextrane, hémicellulose et mixtes : amidon. Index. décimale : 667.9 Revêtements et enduits Résumé : Metallic corrosion is a destructive, hazardous phenomenon that causes techno-economic, environmental, and human loss. The utilization of corrosion inhibitors is an extraordinary way to control metals' corrosion; these are made out of natural or organic/inorganic compounds. By virtue, these organic/inorganic compounds significantly impact ecology, which has constrained the quest for more user-friendly inhibitors. Owing to their eco-friendliness, sustainability, and non-toxicity, natural gums are gaining more importance. Uncontrolled hydration rates, pH, and thermal instability are some of the problems associated with gums. The availability of hydroxyl groups and feasibility of the modification for introducing heteroatoms on the backbone of the gums, combined with various surfactants or salts of halides, can potentially be utilized, which can increase their sustainability. A general survey of the work done on some of the gums in its pure and modified form as an efficient corrosion inhibitor on different metallic substrates is examined in this paper. Note de contenu : - Gum arabic - Guar gum - Xanthan gum - Rosin - Alginates - Pachylobus edulis (PE) gum - Cashew tree gum - Raphia hookeri gum (RhG) - Locust bean gum (LbG) - Azadirachta indica gum (AIG) - Miscellaneous - Table 1 and 2 : Examples of gums and its derivatives used as corrosion inhibitor for various metals DOI : https://doi.org/10.1007/s11998-021-00510-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00510-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37155 [article]

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A concise review on corrosion inhibitors : types, mechanisms and electrochemical evaluation studies / I. A. Wonnie Ma in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 241–268 Titre : A concise review on corrosion inhibitors : types, mechanisms and electrochemical evaluation studies Type de document : texte imprimé Auteurs : I. A. Wonnie Ma, Auteur ; Sh. Ammar, Auteur ; Sachin S. A. Kumar, Auteur ; S. Ramesh, Auteur Année de publication : 2022 Article en page(s) : p. 241–268 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Electrochimie Inhibiteurs (chimie) Index. décimale : 667.9 Revêtements et enduits Résumé : This article presents a concise review of different types of inhibitors for corrosion protection on metal surfaces. Corrosion inhibitors can be of different types, which include organic, inorganic and hybrid (organic/inorganic) materials. They are also classified as cathodic, anodic and/or mixed-type inhibitors, which are based on the active inhibitor molecules that retard the corrosion process. Silicate, nitrites, molybdates, phosphates, zinc salt and cerium salt are widely used as inorganic inhibitors. Many organic compounds have been widely utilized as inhibitors. Corrosion protection will be obtained by various mechanisms such as physisorption, chemisorption, barrier protection, thin-film formation and electrochemical processes. The type of inhibitors, inhibition mechanism and the evaluation methods have been explained in detail. Note de contenu : - TYPE OF CORROSION INHIBITORS : Inorganic inhibitors - Organic inhibitor - Hybrid organic-inorganic inhibitor INHIBITION MECHANISM OF CORROSION INHIBITORS : Adsorptive interaction of corrosion inhibitors on the metal surface - Inhibition of electrochemical process - Electrochemical evaluation for corrosion inhibitor studies - Table 1 Type of organic inhibitors and inhibition efficiency - Table 2 Inhibition efficiency of some corrosion inhibitors evaluated by electrochemical measurement deployed for various type of metal corrosion reduction DOI : https://doi.org/10.1007/s11998-021-00547-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00547-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37156 [article]

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Integration of antifouling properties into epoxy coatings : a review / P. Poornima Vijayan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 269–284 Titre : Integration of antifouling properties into epoxy coatings : a review Type de document : texte imprimé Auteurs : P. Poornima Vijayan, Auteur ; Krzysztof Formela, Auteur ; Mohammad Reza Saeb, Auteur ; P. G. Chithra, Auteur ; Sabu Thomas, Auteur Année de publication : 2022 Article en page(s) : p. 269–284 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alliages polymères Conducteurs organiques Epoxydes Nanoparticules Revêtements antisalissures:Peinture antisalissures Revêtements organiques Salissures biologiques Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Index. décimale : 667.9 Revêtements et enduits Résumé : The need for nontoxic antifouling coatings has encouraged material scientists to develop a class of organic coatings for diverse applications. As a versatile thermosetting resin and well known for coating application, antifouling characteristics have been integrated into epoxy along with anticorrosion and adhesive functions. Accordingly, both micro- and macro-biofoulings have been successfully controlled by using epoxy-based antifouling coatings. Epoxy nanocomposites, silicon-grafted epoxy, epoxy-aided conductive polymer blends, and nanocomposites are important antifouling epoxy variants far and wide examined in developing epoxy-based coatings. Besides, some purpose-specific multifunctional smart coatings based on epoxy with antifouling features are used to integrate several functions into one material. This review discusses various types of epoxy-based antifouling coatings. The ability of nanomaterials, siloxanes, and conducting polymers to induce antifouling activity into the epoxy and corresponding antifouling mechanisms is also covered. The review concludes with the enormous potential of antifouling epoxy coatings as cost-effective, environmentally sustainable solution to biofouling in diverse industrial applications. Finally, the future ahead of antifouling epoxy coating is patterned. Note de contenu : - Antifouling epoxy nanocomposites - Silicon-modified antifouling epoxy coatings - Antifouling epoxy/conductive polymer blends - Epoxy/conductive polymer blends nanocomposites as antifouling coatings - Multifunctional epoxy coatings with antifouling features - Table 1 : Outcomes of major research on epoxy-based antifouling coatings DOI : https://doi.org/10.1007/s11998-021-00555-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00555-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37157 [article]

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Seeking a paper for digital printing with maximum gamut volume : a lesson from artificial intelligence / Maryam Ataeefard in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 285-293 Titre : Seeking a paper for digital printing with maximum gamut volume : a lesson from artificial intelligence Type de document : texte imprimé Auteurs : Maryam Ataeefard, Auteur ; Seyyed Mohamad Sadati Tilebon, Auteur Année de publication : 2022 Article en page(s) : p. 285-293 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Algorithmes génétiques Couleur Impression au laser Impression numérique Papier Réseaux neuronaux (informatique) Index. décimale : 667.9 Revêtements et enduits Résumé : The color gamut of imaging media is significant for the reproduction of color images because its magnitude directly affects the degree to which colors change during the printing process. Over the last few years, digital impression technology has started to play a substantial role in the printing industry due to the quest for short runs and variable information printing. The color gamut of electrophotographic digital printing depends on various parameters including the printer and toner, but especially the properties (whiteness, roughness, and gloss) of the paper, which influence the final printed color gamut and replication quality. Artificial intelligence approaches are applied herein for the first time to choose and predict the performance of a paper with appropriate properties to achieve the maximum color gamut. A genetic algorithm-based computer code is developed to optimize the architecture of an artificial neural network, thereby yielding an accurate model to predict the color gamut achievable in electrophotographic color printing. The gamut volume was generated using an Eye-One spectrophotometer, ProfileMaker, and ColorThink software. The properties of 11 dissimilar types of paper were assessed by atomic force microscopy, spectrophotometer, and goniophotometer. The results indicate that the reproducibility depended considerably on the features of the paper. Although high whiteness and gloss increased the color gamut volume, and high roughness decreased the reproducibility of the printing machine, the artificial intelligence approach provided the opportunity to achieve a high gamut volume with low gloss and high roughness. Note de contenu : - Printing trials - Measurement of color gamut and paper properties - Model development and optimization - Table 1 : Scenarios considered as internal data for the constructed model - Table 2 : Parameter values used in NSGA II optimization - Table 3 : Reliability of MLP ANNs with different structures and one hidden layer DOI : https://doi.org/10.1007/s11998-021-00393-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00393-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37158 [article]

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Thin films of cyclotriphosphazenes containing 1,3,4-oxadiazoles as fluorophores / Martín Caldera-Villalobos in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 295–302 Titre : Thin films of cyclotriphosphazenes containing 1,3,4-oxadiazoles as fluorophores Type de document : texte imprimé Auteurs : Martín Caldera-Villalobos, Auteur ; Ana M. Herrera-González, Auteur ; Violeta Álvarez-Venicio, Auteur ; Miriam Martins-Alho, Auteur ; Margarita Rivera, Auteur ; M. del Pilar Carreón-Castro, Auteur Année de publication : 2022 Article en page(s) : p. 295–302 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Composés hétérocycliques Couches minces Matériaux -- Propriétés optiques Nanotechnologie Revêtement par centrifugation Semiconducteurs Index. décimale : 667.9 Revêtements et enduits Résumé : In this work, hexa-substituted cyclotriphosphazenes bearing 1,3,4-oxadiazole groups as fluorophores were employed in the formation of thin films. The cyclotriphosphazenes compounds as well as the films exhibited photoluminescence with emission in the UV-blue region. Fluorescence quantum yields of cyclotriphosphazenes range between 0.04 and 0.10. The bandgap of cyclotriphosphazenes was 4 eV showing properties of wide bandgap semiconductors. The morphological characterization of the films by SEM and AFM showed homogeneous surfaces without defects. The optical properties of cyclotriphosphazenes are different when they are in solution and thin films because of favorable binding supramolecular interactions. In thin films, the supramolecular interaction enhances the optical properties of these materials. Note de contenu : - EXPERIMENTAL SECTION : Materials - Thin films - Optical properties - RESULTS AND DISCUSSION : Optical characterization in solution- Optical characterization in thin films - Morphologic characterization - Table 1 : Optical properties of cyclotriphosphazenes bearing 1,3,4-oxadiazoles in solution (5 × 10−6 M in chloroform-DMF 19:1) - Table 2 : Optical properties of cyclotriphosphazenes bearing 1,3,4-oxadiazoles in thin films - Table 3 : Morphological characteristics of cyclotriphosphazenes in thin films DOI : https://doi.org/10.1007/s11998-021-00524-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00524-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37159 [article]

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Enhancing weathering durability of pre-protected and unprotected wood by using bark extracts as natural UV absorbers in waterborne acrylic coating / Özlem Özgenç in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 303–321 Titre : Enhancing weathering durability of pre-protected and unprotected wood by using bark extracts as natural UV absorbers in waterborne acrylic coating Type de document : texte imprimé Auteurs : Özlem Özgenç, Auteur ; Ebru Bilici, Auteur ; Sefa Durmaz, Auteur ; Cevdet Sögütlü, Auteur ; Serkan Emik, Auteur Année de publication : 2022 Article en page(s) : p. 303–321 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorbeurs de rayonnement ultraviolet Adhésion Bois -- Revêtements protecteurs Caractérisation Colorimétrie Ecorces Essais accélérés (technologie) Extraits de plantes Polyacryliques Résistance aux conditions climatiques Revêtements -- Analyse Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : One of the crucial problems for wooden garden furniture is fading with the effect of UV rays. The color changes as a result of weathering have affected the usage of furniture. In this study, waterborne acrylic coatings containing bark extracts were evaluated as an environment-friendly wood surface preservative to improve the service life of wood in outdoor conditions. For this purpose, waterborne acrylic coatings were produced using extracts from the bark of 10 tree species applied on two different wood surfaces (scots pine and beech). The natural weathering test was conducted to determine the changes in the physical, mechanical and chemical structures of the coatings and wooden surfaces. It was observed that the color changes and surface roughness values were similar to the control samples for the heat-treated wood while they were the lowest for the impregnated scots pine. The color change of the test coatings applied on the unprotected scots pine surfaces provided similar results to the control coatings. The ATR-FTIR spectroscopy analysis revealed changes in the chemical structure, which explained why color changes occurred. The pre-protection methods affected the penetration of coatings and adhesion strength. The differences in the chemical structure of barks also influenced the viscosity of the coatings. After the weathering test, the change in the dry film thickness and adhesion strength of the acrylic coatings containing bark extract was similar to the control coatings for the heat-treated wood. The change in the adhesion strength values in the test coatings on the pine surfaces was similar to the control coatings. The macroscopic evaluation also showed the effectiveness of the bark extracts against weathering conditions. It is thought that it may be possible to use tree bark extracts with high UV absorbability instead of commercial UV absorbers in waterborne acrylic coatings used in outdoor conditions. Note de contenu : - MATERIAL AND METHOD : Wood and bark samples - Pre-protection methods - Bark extraction and coating system process - Coating system process - Chemical analysis of coating systems - Natural weathering test - Color measurement - Adhesion strength test - RESULTS AND DISCUSSION : UV–Vis spectroscopy analysis and liquid ATR-FTIR of test and control coatings - Color change in natural weathering conditions - ATR-FTIR spectroscopy analysis - Surface roughness change and macroscopic evaluation in natural weathering conditions - Change in dry film thickness - Change in adhesion strength - Table 1: Impregnation retention and heat treatment weight loss values of wood samples - Table 2 : Total phenol content and antioxidant activity of tree bark extracts (BE) - Table 3 : Acrylic resin types for wood coating systems - Table 4 : The viscosity values of test and control waterborne acrylic coatings - Table 5 : Some characteristic IR bands of functional groups in all coatings on the pre-protected and unprotected wood pine surfaces - Table 6 : Relative changes in the characteristic peak bands’ high ratio for FTIR analysis - Table 7 : Macroscopic evaluation scoring of test and control coatings on the wood surfaces after weathering test DOI : https://doi.org/10.1007/s11998-021-00528-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00528-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37160 [article]

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Alternative methods for transferring mosquito repellent capsules containing bio-based citronella oil to upholstery fabrics: coating and printing / Merih Sariisik in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 323–336 Titre : Alternative methods for transferring mosquito repellent capsules containing bio-based citronella oil to upholstery fabrics: coating and printing Type de document : texte imprimé Auteurs : Merih Sariisik, Auteur ; Gülsah Ekin kartal, Auteur ; Gökhan Erkan, Auteur ; Sadi Etkeser, Auteur Année de publication : 2022 Article en page(s) : p. 323–336 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Ameublement Citronnelle Coacervation La coacervation est un phénomène colloïdal qui implique la diminution de solubilté d'un polymère dans un solvant par addition de quantité importante de différents composés : un alcool, un deuxième polymère plus soluble ou un sel (sulfate de sodium). Les molécules de polymère qui sont désolvatées coalescent et forment des gouttelettes, dites gouttelettes de coacervat. Si la coacervation se fait dans un milieu ou il y a deux phases, les gouttelettes de coacervat se regroupent à l'interface créant ainsi une membrane. Il suffit alors de durcir la membrane, de la rendre plus résistante par des réactions de crosslinking entre les molécules de polymère. Coacervation simple : La coacervation est déclenchée par addition d'un alcool concantré, par exemple de l'éthanol à 50% ou du sulfate de sodium Coacervation complexe : La coacervation complexe repose sur le même principe que la coacervation simple excepté que : le polymère en solution dans la phase continue est un polymère chargé, un deuxième polymère est utilisé pour modifier le solubilité du premier. Ce deuxième polymère porte une charge opposée à celle du premier. Encapsulation Enduction textile Ethylcellulose Insecticides Matériaux -- Imprégnation Microcapsules Morphologie (matériaux) Moustiques Textiles et tissus Index. décimale : 667.9 Revêtements et enduits Résumé : The aim of this study was to prepare insect repellent textiles and compare the application methods. Bio-based insect repellent agent citronella oil was encapsulated with ethyl cellulose shell with coacervation method. Morphological assessment showed that capsules had smooth surfaces and their shape was spherical. The homogenous size distribution of the capsules was supported and the mean particle size of the optimum formulations was almost 50 μm. Outdoor upholstery fabrics were treated with citronella capsules by coating and printing to compare the application methods. After application, the insecticide effects of the fabrics were investigated and compared with the impregnation method. Insecticide activity was evaluated against common house mosquitoes (Culex pipiens), with respect to cone bioassay of World Health Organization. Mosquitoes tended to stay away from treated fabrics, and mortality rates of mosquitos were noted as 72, 65 and 55% for printing, coating and impregnation, respectively, and the fabrics still showed repellency after five washing cycles. This study showed that the developed product might be used as an alternative to the other products in the market for avoiding mosquito-borne diseases and these results showed that capsules can be transferred by printing and coating processes when compared with the impregnation method. Note de contenu : - EXPERIMENTAL : Materials - Preparation of the microcapsules - Mass yield of microcapsule - Particle morphology of microcapsules - Particle size of microcapsules - Fourier transform infrared spectrophotometer (FTIR) analysis - Thermogravimetric analysis (TGA) - Application of the microcapsules to the outdoor upholstery fabrics - Evaluation of treated fabrics - RESULTS AND DISCUSSION : Mass yield of microcapsules - Particle morphology of microcapsules - Particle size of microcapsules - Fourier transform infrared spectrophotometer (FTIR) analysis - Thermogravimetric analysis (TGA) - Evaluation of treated fabrics - Table 1 : Capsule transfer prescription for printing method - Table 2 : Capsule transfer prescription for coating method - Table 3 : Capsule transfer prescription for impregnation method - Table 4 : Mass yield of microcapsules - Table 5 : SEM photomicrographs of outdoor upholstery fabrics treated with citronella capsules with no wash, after 5 washing cycles and after rubbing - Table 6 : The ion chromatogram of citronella oil and GC-MS diagrams of outdoor upholstery fabrics treated with citronella capsules with no wash and after 5 washing cycles - Table 7 : Citronella amount in the samples as a result of GC-MS analysis - Table 8 : m2 weight changes of samples before and after washing - Table 9 : Insect repellent effect results of samples - Table 10 : Dimensional change percentage for fabrics - Table 11 : Fastness test results of capsule-transferred fabrics containing citronella - Table 12 : Color measurements of fabrics DOI : https://doi.org/10.1007/s11998-021-00529-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00529-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37161 [article]

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Investigation of cellulose nanocrystals (CNC) and cellulose nanofibers (CNF) as thermal barrier and strengthening agents in pigment-based paper coatings / Brenda Hutton-Prager in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 337–346 Titre : Investigation of cellulose nanocrystals (CNC) and cellulose nanofibers (CNF) as thermal barrier and strengthening agents in pigment-based paper coatings Type de document : texte imprimé Auteurs : Brenda Hutton-Prager, Auteur ; Esteban Ureña-Benavides, Auteur ; Sanjiv Parajuli, Auteur ; Kolawole Adenekan, Auteur Année de publication : 2022 Article en page(s) : p. 337–346 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aliments -- Emballages Analyse mécanique dynamique Cellulose La cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules. Formulation (Génie chimique) Nanofibres Nanoparticules Pigments Protection thermique Revêtements -- Propriétés mécaniques Revêtements en papier Index. décimale : 667.9 Revêtements et enduits Résumé : In response to food packaging improvements, this study investigates changes in mechanical and thermal barrier properties of pigment-based paper coatings when cellulose nanocrystals (CNC) and cellulose nanofibers (CNF) are added to the formulation. Stable dispersions of all coating components were formed between pH 7–9 (zeta potential > |30 mV|) except CNF, which favored stable dispersions at higher pH. Hydrodynamic diameters (Dh) of CNC and CNF decreased when interacting with calcium carbonate ions (Ca2+ and CO32-) ; however, latex binder and dispersant diameters were unaffected by the presence of CaCO3 in solution. Thermal barrier performance was quantified by measuring ΔT across coated samples, with and without nanoparticle additives. Both CNC and CNF additives significantly contributed to the ΔT measured, with the best result recorded for 2 wt% CNF, pH 7, and a drying rate of 25 °C/min. This sample recorded 37 ± 6 °C higher than the ΔT for baseline coatings (without additive). Dynamic mechanical analysis (DMA) showed a higher storage modulus for all samples containing CNC and/or CNF compared with the baseline coating, suggesting a material with greater resistance to deformation from applied load. Higher dissipation energy was also observed; however, lower tan delta values suggest improved mechanical properties with both additives. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Materials - Methods - RESULTS AND DISCUSSION : Fundamental properties of the formulation - Thermal barrier performance of the coatings - Mechanical strength performance of the coatings DOI : https://doi.org/10.1007/s11998-021-00538-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00538-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37162 [article]

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Robust surface with thermally stable hydrophobicity enabled by electrosprayed fluorinated SiO2 particles / Haojun Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 347-353 Titre : Robust surface with thermally stable hydrophobicity enabled by electrosprayed fluorinated SiO2 particles Type de document : texte imprimé Auteurs : Haojun Liu, Auteur ; Yunxi Zhang, Auteur ; Zhijun Ma, Auteur ; Hang Zhang, Auteur Année de publication : 2022 Article en page(s) : p. 347-353 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Chimie des surfaces Dioxyde de silicium Hydrophobie Particules (matières) Pulvérisation électrostatique Stabilité thermique Système de pulvérisation (technologie) Index. décimale : 667.9 Revêtements et enduits Résumé : Highly hydrophobic surface property is important for many applications, such as anticorrosion, antifogging, and antifouling. With regard to some practical applications, both mechanical endurance and thermal stability are essential. Here, we report a new method for making highly hydrophobic surfaces with simultaneously enhanced mechanical endurance and thermal stability. Such high-performance hydrophobic surfaces were prepared by coating electrospraying derived fluorinated SiO2 particles on various substrates, including glass slide, ceramic wafer, metal foil, and polymer sheet, with methyl silicone resin as the binder. Fluorinate silane was homogenously doped in the matrix of SiO2 particles, which can provide excellent protection effect. Meanwhile, the thermally stable methyl silicone resin can afford strong binding force between SiO2 particles and the substrates. Therefore, the hydrophobic surfaces created here possess both high mechanical endurance and excellent thermal stability. Note de contenu : - Experimental : Fabrication of thermally stable hydrophobic surface - Characterization DOI : https://doi.org/10.1007/s11998-021-00540-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00540-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37163 [article]

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Effect of structure-controlled aluminum silicate nanofiller on surface properties of emulsion coating films / Fumihiko Ohashi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 355–360 Titre : Effect of structure-controlled aluminum silicate nanofiller on surface properties of emulsion coating films Type de document : texte imprimé Auteurs : Fumihiko Ohashi, Auteur ; Kenji Arai, Auteur ; Atsushi Shibahara, Auteur Année de publication : 2022 Article en page(s) : p. 355–360 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Charges (matériaux) Essais accélérés (technologie) Mouillabilité Nanoparticules Revêtements antisalissures Revêtements en phase aqueuse -- Additifs Silicate d'aluminium Vernis en phase aqueuse -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : A non-crystalline aluminum silicate related to allophane (i.e., clay mineral) was synthesized by a hydrothermal reaction after which the synthetic mineral was mixed with clear or multicolored aqueous emulsion paint as a nanofiller. The nanofiller was revealed by X-ray diffraction to have an amorphous morphology, showed a narrow particle size distribution with a volume mean diameter of 1.2 µm and indicated a specific surface area of 228 m2/g. Clear films prepared with the nanofiller had significantly improved wettability compared to a blank film. The results of outdoor exposure tests exhibited that multicolored films with the nanofiller showed higher antifouling ability than films with a commercially available silica filler. A proposed antifouling mechanism is that the proportion of Si-OH and Al-OH active sites exposed on the nanofiller surface had a significant effect on the surface wettability of the films and exquisitely controlled the sliding of rain droplets. Note de contenu : - Preparation of nanofiller - Preparation of clear film - Preparation of multicolored film - Characterization - Table 1 : Characteristic data of the nanofiller-contained clear films - Table 2 : Outdoor exposure tests of the nanofiller-contained multicolored films (2.5 months) - Table 3 : Outdoor exposure tests of the nanofiller-contained multicolored films and references (6 months) DOI : https://doi.org/10.1007/s11998-021-00541-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00541-6.pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37164 [article]

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