Ice Adhesion to Hydrophilic and Hydrophobic Surfaces

Abstract

The adhesional shear strength has been determined for ice formed against polished steel, monolayers adsorbed on steel and thin plastic coatings painted on metal surfaces, The adsorbed monolayers reduced the shear strength to about one-third of that for ice on clean steel. The monolayers also had the effect of changing the character of the breaks from clearly cohesional to apparently adhesional failure. The shear strength from the plastic coatings ranged from values equal to that of ice against clean steel to values 70 to 80% lower. The reduction in shear strength did not correlate with the water contact angle on the coatings but was usually found to be due either to air entrapment at the ice/coating interface or to cohesive failure of the coating itself.The ice separated from the various substrates was examined microscopically by forming lastic replicas of the ice surface. These studies helped determine 8 e mechanism of failure and, since one of the replicating solutions was also an ice etchant, much was learned about the crystal structure and the crystal defects of ice near surfaces. The ice lattice was found to be highl defective near the substrates and this is discussed in connection w i x the "liquid-like," behavior of interfacial ice.

Deformation of advancing menisci

“…and the primary film thickness cm. or less as suggested by Bascorn, et al (7). These equations indicate that in general what we are able to see is a capillary meniscus of a circular crosssection.…”

“…In fact Bascom, Cottington, and Singleterry (7) showed experimentally that a primary film spread over a long distance on a flat plate while no film was detected on another plate placed parallel and closer to the bulk film than the final spreading distance. They concluded from this that in their experiments the primary film must be advanced by surface diffusion and not through the vapor phase.…”

A light lithium niobate transducer design and ultrasonic de-icing research for aircraft wing

“…Archer and Gupta [30] studied ice adhesion to Al 6061 alloy. Ice adhesion to hydrophilic and hydrophobic surfaces was investigated by Bascom et al [31] Extensive literature review was provided by Ramanathan et al in the bonding strengths of the iceesubstrate interface [29]. The summary of the adhesive shear strengths of refrigerated and wind-tunnel ice, obtained from our literature survey, is given in Tables 2 and 3, respectively.…”

Modélisation numérique et validation expérimentale d'un système de protection contre le givre par éléments piézoélectriques /

“…Les revues de littérature réalisées par Scavuzzo et al [16] et par Ramanathan [17], permettent de bien résumer les résultats expérimentaux sur la valeur de la résistance en cisaillement de la glace à un substrat (Tableau 1 [18][19][20][21][22][23][24][25] [36,37].…”