Combined effect of relative humidity and substrate temperature on evaporation of methanol droplet / Sahar Andalib in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 6 (11/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 6 (11/2019) . - p. 1691-1698 Titre : Combined effect of relative humidity and substrate temperature on evaporation of methanol droplet Type de document : texte imprimé Auteurs : Sahar Andalib, Auteur ; Ali Alshehri, Auteur ; Pirouz Kavehpour, Auteur Année de publication : 2019 Article en page(s) : p. 1691-1698 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Air -- Humidité Evaporation Gouttelettes Méthanol Polydiméthylsiloxane Le polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones. Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone. Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK). La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones. Surfaces (Physique) Température Index. décimale : 667.9 Revêtements et enduits Résumé : Understanding and manipulating the mechanisms involved in the evaporation of organic solvent droplets in a humid environment are of great importance for numerous industrial and biological applications. The combined effect of substrate temperature and relative humidity of the environment on evaporation of pure methanol droplets has been experimentally investigated. A drop shape analyzer was used to record the evolution of contact angle, base diameter, and volume of the droplet. At low relative humidity, the droplet experiences three stages of evaporation: constant, slightly increasing, and sharply decreasing constant angle. Substrate temperature has no effect on the qualitative behavior of the droplet at low relative humidity. At high relative humidity, droplet evolution is influenced by substrate temperature. At relatively high substrate temperature, the droplet undergoes two stages of evaporation where the contact angle increases to a maximum then decreases until the end of evaporation. At low substrate temperature, the droplet experiences a single stage where it reaches an equilibrium state with finite volume, diameter, and contact angle. In humid environment, water vapor gets adsorbed–absorbed and/or condensed on the droplet. Decreasing substrate temperature causes the temperature at the liquid–gas interface to fall below the dew point which enhances the water condensation. The evaporation rate diminishes as the relative humidity rises and its effect is more pronounced for lower substrate temperature. Relative humidity of the surroundings seems to have a negligible effect on the initial evaporation rate which is mainly attributed to the evaporation of methanol. A regime map is proposed based on the different evolution of droplets under different environmental conditions as well as substrate temperature. Note de contenu : - EXPERIMENTAL TECHNIQUES - RESULTS AND DISCUSSION : Droplet evolution - Evaporation rate - Regime map DOI : 10.1007/s11998-019-00271-w En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00271-w.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33422 [article]

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Comparative study of the dynamic hydrophobicity of fluoroalkylsilane coatings tilted at acute and obtuse angles / Yuta Higashino in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 4 (07/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 4 (07/2018) . - p. 891-898 Titre : Comparative study of the dynamic hydrophobicity of fluoroalkylsilane coatings tilted at acute and obtuse angles Type de document : texte imprimé Auteurs : Yuta Higashino, Auteur ; Hirokazu Takahashi, Auteur ; Munetoshi Sakai ; Toshihiro Isobe ; Sachiko Matsushita, Auteur ; Akira Nakajima, Auteur Année de publication : 2018 Article en page(s) : p. 891-898 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de glissement Fluoroalkylsilane Gouttelettes Hydrophobie Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : The relation between surface homogeneity and internal fluidity for a droplet sliding on a surface tilted at acute and obtuse angles was investigated using two hydrophobic fluoroalkylsilane (FAS) coatings with different roughness. The coatings (FAS-smooth and FAS-rough) were prepared on an Si substrate using chemical vapor deposition or soaking methods and were tilted at 35° or 145°. Sliding velocity of water droplets on the surface tilted at 145° was greater than that tilted at 35° for both coatings. For 35° tilting, the dominant mode of the sliding velocity was slipping for FAS-smooth, whereas rolling governed the entire sliding velocity for FAS-rough. The slipping mode was more important than the rolling one for both coatings when they were tilted at 145°. The change of slipping velocity was more remarkable than that of rolling one for both coatings between 35° and 145° tilting. Results show that the difference in gravity direction and contact area of the droplets contributed to this tilt angle dependence of the sliding velocity. When a droplet slid down with acceleration on FAS-smooth surface, the coefficient of the viscous drag force correlated with the velocity ratio (Utotal/Uslip). DOI : 10.1007/s11998-018-0064-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0064-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30866 [article]

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Development of multiple-droplet drop-casting method for the fabrication of coatings and thin solid films / Morteza Eslamian in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 2 (03/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 2 (03/2018) . - p. 271-280 Titre : Development of multiple-droplet drop-casting method for the fabrication of coatings and thin solid films Type de document : texte imprimé Auteurs : Morteza Eslamian, Auteur ; Firuze Soltani-Kordshuli, Auteur Année de publication : 2018 Article en page(s) : p. 271-280 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces Dépôt par pulvérisation Gouttelettes Poly(3,4-éthylènedioxythiophène) Polystyrène sulfone Revêtements organiques Ultrasons Vibrations (mécanique) Index. décimale : 667.9 Revêtements et enduits Résumé : Spray coating is a commercial and low-cost technique for the fabrication of large-area coatings and thin films, but it is a stochastic process that is hard to control, as far as the fabrication of thin coatings and solid films is concerned. On the other hand, drop-casting is a facile and more controllable coating technique than spray coating, but its application is limited to small-area thin solid films and coatings. The objective of this work is, therefore, to study the feasibility of impinging an array of droplets, rather than just one droplet, to fabricate polymeric and other solution-processed thin films with larger surface areas than those produced by conventional drop-casting. To this end, in this study, four droplets of poly(3,4-ethylenedioxythiophene)–polystyrene sulfonate (PEDOT:PSS) solution are released simultaneously and impinged on the four vertices of a square on a wettable solid surface to make a thin film. The effect of the substrate texture on the spreading and the film formation process is studied. As a novel idea, the substrate is excited by ultrasonic vibration to improve the droplet spreading and coalescence. It is shown that as time elapses, the impinged droplets successfully coalesce and make a thin film. Surface morphology and roughness of the resulting PEDOT:PSS thin solid films show that, except on the edges, the resulting thin solid films are uniform. This leads us to conclude that the application of equal-sized and equally-spaced multiple droplets released simultaneously and impinged on vibrating substrates could be considered as a new coating technique, which has some of the benefits of the spray coating, but it is much more controllable than spray coating. DOI : 10.1007/s11998-017-9975-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9975-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30279 [article]

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Droplet asymmetry and wetting dynamics on irregularly roughened surfaces / Kewei Shi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 3 (05/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 3 (05/2021) . - p. 911-919 Titre : Droplet asymmetry and wetting dynamics on irregularly roughened surfaces Type de document : texte imprimé Auteurs : Kewei Shi, Auteur ; Justin Elms, Auteur ; Xili Duan, Auteur ; Kristin M. Poduska, Auteur Année de publication : 2021 Article en page(s) : p. 911-919 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact Caractérisation Gouttelettes Métaux -- Surfaces Mouillage (chimie des surfaces) Rugosité Index. décimale : 667.9 Revêtements et enduits Résumé : This study illustrates pervasive challenges in studying wetting dynamics, including dynamic contact angles, on irregularly roughened surfaces. We demonstrate that asymmetric water droplet shapes occur more than 50% of the time during static and dynamic contact angle measurements on sandblasted Zn-plated stainless steel with a polymeric overcoat. The pinning that causes the asymmetric drop shape distortion on horizontal surfaces also influences the sliding behavior on inclined surfaces. These effects lead to a poor correlation between the measured dynamic contact angles and the observed sliding angles (critical tilt angles). Our work emphasizes that large variations in the values of these dynamic wetting parameters are inherent to the heterogeneity of the surface roughness, and thus they limit the usefulness of standard dynamic wetting criteria. These findings have implications for academic and industrial research focused on making coated materials that have consistent wettability properties throughout their usage life cycle. Note de contenu : - EXPERIMENTAL METHOD : Materials - Dynamic contact angle measurements - Data processing and fitting - RESULTS AND DISCUSSION : Surface characterization - Volume-modified droplets (horizontal surfaces) - Sliding droplets (inclined surfaces) - Comparison with the Furmidge model - Table 1 : Comparison of acceptable measurements, as a function of data fitting rates, during volume modification contact angle measurements of 20 µL droplets DOI : https://doi.org/10.1007/s11998-020-00456-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00456-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35939 [article]

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Droplet shedding on hydrophilic and superhydrophobic surfaces under the effect of air shear flow / Tao Shi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 2 (03/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 2 (03/2024) . - p. 789-798 Titre : Droplet shedding on hydrophilic and superhydrophobic surfaces under the effect of air shear flow Type de document : texte imprimé Auteurs : Tao Shi, Auteur ; Hanming Yang, Auteur ; Huaqiao Peng, Auteur ; Zuxi Xia, Auteur Année de publication : 2024 Article en page(s) : p. 789-798 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium -- Alliages Chlorhydrique, Acide Gouttelettes Hydrophilie Hydrophobie Mouillabilité Peroxyde d'hydrogène Le peroxyde d'hydrogène (H2O2), communément appelé eau oxygénée ou encore perhydrol (appellation industrielle), est un composé chimique liquide et visqueux, aux puissantes propriétés oxydantes (il est aussi réducteur). C'est donc un agent blanchissant efficace qui sert de désinfectant et (à haute concentration) d'oxydant ou monergol dans les fusées spatiales. Polydiméthylsiloxane Le polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones. Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone. Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK). La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones. Revêtements organiques Surfaces (technologie) Taille des gouttelettes Index. décimale : 667.9 Revêtements et enduits Résumé : This study aims to investigate and compare the behavior of droplets of different volumes on hydrophilic and superhydrophobic surfaces (SHSs) under the effect of air shear flow. The results reveal that the effect of droplet volume on wetting length in the case of a hydrophilic surface is different from that in the case of SHS. On hydrophilic surfaces, droplets with larger volumes exhibit greater wetting length and adhesion, whereas on SHSs, these parameters are similar regardless of droplet volume. Additionally, airflow velocity is one of the critical factors for shear-driven droplet behavior on SHS. At an airspeed of 5 m/s, droplets slide on the SHS; however, they roll on the surface at an airspeed of 15 m/s. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Samples preparation - Wettability measurements - Droplet shedding experimental setup - RESULTS AND DISCUSSION : Wettability and water adhesion on the Al and Al-PDMS surfaces - Change in wetting length and dynamic contact angle with droplet movement on the Al surface - Change in wetting length and dynamic contact angle with droplet movement on the Al-PDMS surface - Table 1 : Wettability of the samples DOI : https://doi.org/10.1007/s11998-023-00861-9 En ligne : https://drive.google.com/file/d/10aEOHuMVYDfnmazbZgLIvfL_xuHpAuVr/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40793 [article]

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From the spray pattern to the perfect finish in INTERNATIONAL SURFACE TECHNOLOGY (IST), Vol. 13, N° 4 (2020)

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High-precision, drop-by-drop application of PVC in INTERNATIONAL SURFACE TECHNOLOGY (IST), Vol. 13, N° 3 (2020)

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Mechanical stability of alkyd emulsions - Part 1 : influence of emulsion droplet size and the emulsifier / Gunilla Östberg in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 832 (05/1994)

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New material removes airborne droplets / Thierry Destruhaut in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 211, N° 4670 (08/2021)  

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Numerical simulation of flows in beadless disperser by finite difference lattice Boltzmann method / X. F. Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 4, N° 1 (03/2007)  

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Observation of sessile droplet freezing on textured micropillar surfaces via visualization and thermography / Yuan Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 3 (05/2019)  

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Parameters influencing the spray behavior of waterborne coatings / Lin-lin Xing in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 71, N° 890 (03/1999)

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Spray pattern monitoring - With every droplet in focus in INTERNATIONAL SURFACE TECHNOLOGY (IST), Vol. 14, N° 1 (2021)

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Les têtes d'impression jet d'encre in L'INDUSTRIE TEXTILE, N° 1297 (04/1998)

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Ultrasonic atomisation : A novel technique for surface coatings / S. G. Gaikwad in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 88, B3 (09/2005)  

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