Dynamic of spreading on ultra-hydrophobic surfaces / A. Mohammad Karim in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 5 (09/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 5 (09/2015) . - p. 959-964 Titre : Dynamic of spreading on ultra-hydrophobic surfaces Type de document : texte imprimé Auteurs : A. Mohammad Karim, Auteur ; H. P. Kavehpour, Auteur Année de publication : 2015 Article en page(s) : p. 959-964 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact Cinétique chimique Hydrodynamique Hydrophobie Mouillage (chimie des surfaces) Polyéthylène glycol Polytétrafluoréthylène Verre Index. décimale : 667.9 Revêtements et enduits Résumé : Despite the extensive variety of applications for ultra-hydrophobic surfaces in industry, technology, and biology, due to their wetting characteristics, there has not been considerable attention in the area of dynamics of wetting on ultra-hydrophobic surfaces. In this research, the experimental investigations have been done by applying forced spreading of several polyethylene-glycol/water mixtures in different weight ratios on Teflon plates and ultra-hydrophobic sprayed glass substrates. Hydrodynamics theory and molecular-kinetic theory have been applied to investigate the dynamics of wetting on these substrates. It has been found that the dynamics of receding motion of liquid contact line on ultra-hydrophobic surfaces could be described perfectly with the molecular-kinetic theory. In the case of advancing motion on an ultra-hydrophobic surface, dynamic contact angle is independent of liquid contact line velocity. The advancing and receding motions of liquid contact line on smooth Teflon plates followed molecular-kinetic theory. DOI : 10.1007/s11998-015-9686-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9686-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24702 [article]

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Free-surface profile of evaporative liquids at the vicinity of the contact line / S. Houssainy in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 5 (09/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 5 (09/2015) . - p. 863-867 Titre : Free-surface profile of evaporative liquids at the vicinity of the contact line Type de document : texte imprimé Auteurs : S. Houssainy, Auteur ; H. P. Kavehpour, Auteur Année de publication : 2015 Article en page(s) : p. 863-867 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Evaporation Interfaces (Sciences physiques) Ligne de contact (chimie physique) (Chimie physique) Ligne correspondant à l’intersection apparente de deux interfaces contigües. Mouillage (chimie des surfaces) Surfaces -- Analyse Index. décimale : 667.9 Revêtements et enduits Résumé : Interfacial phenomenon, specifically those associated with evaporation from thin liquid films near the contact line of a liquid drop, plays a major role in many current engineering applications which require high local heat fluxes, as evident in heat pipes, grooved evaporators, fuel cells, and suction nucleate boiling devices (Potash and Wayner in Int J Heat Mass Transf 15:1851–1863, 1971; Hanchak et al. in Int J Heat Mass Transf 75:196–206, 2014). This study will prove useful in the improvement of such applications. Fluorescence microscopy was used as our main technique for investigating the free-surface profiles of evaporative liquids at the vicinity of the contact line, as it delivers sufficient range and resolution to address the challenge of capturing the microscopic and macroscopic aspects of this phenomenon. The free-surface profiles of relatively low evaporative liquids were compared with those of nonevaporative liquids, specifically one centistoke silicon oil was compared with one hundred centistokes silicon oil and qualitatively no difference has been observed between both profiles near the contact line. DOI : 10.1007/s11998-015-9716-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9716-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24686 [article]

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