Wettability of sulfonated graphene oxide membranes for proton exchange membrane fuel cells

Guilizzoni, Manfredo; Sapienza, Jessica; Caruana, Roberta; Basso Peressut, Andrea Stefano; Di Virgilio, Matteo; Latorrata, Saverio

doi:10.1016/j.colsurfa.2024.133151

Cited by 2 publications

(2 citation statements)

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“…Many versions of the ADSA technique have been developed over the years [28], but the method used in this analysis is the one thoroughly described in previous works of the same authors [10,29], which led to a measurement error within 1.5 • . In short, according to this approach, an objective function, to be minimized, is formulated as the summation of the squared distances between the theoretical and experimental points representing the drop profile.…”

Section: Static Contact Anglementioning

confidence: 99%

“…In particular, the spreading factor, S, is a measure of the tendency of a liquid to wet a surface; thus, it is positive when the liquid fully spreads on the surface, while it is negative when the liquid forms drops on the surface. The reversible work of adhesion, W ′′ a , is a measure of the tendency of a liquid to remain in contact with a surface, namely, avoiding the tendency to slide away when the surface is not horizontal [29]. These two parameters are defined as [30]:…”

Section: Spreading Factor and Reversible Work Of Adhesionmentioning

confidence: 99%

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Experimental Analysis of the Effect of Limescale on the Wettability of Indirect Evaporative Cooling System Plates

Caruana,

Marocco,

Liberati

et al. 2024

Fluids

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Indirect evaporative cooling systems have attracted much interest in recent years as they guarantee good cooling effectiveness, with lower energy demand with respect to traditional systems, thus helping to address the issue of climate change. Many studies have shown that an increase in the wettability of recuperator plates results in an improvement in the system performance. However, if the water injected into the system comes from the city water supply, it will contain calcium carbonate residuals, which will form limescale layers on the plates, thus possibly changing their wetting behavior. Therefore, the wettability of three surfaces (an aluminum uncoated surface, AL, a standard epoxy coating, STD, and a hydrophilic lacquer, HPHI) was analyzed in the presence of limescale formations, and compared with that obtained in a previous study for corresponding clean surfaces. The results showed that the HPHI contact angle was reduced in the presence of limescale (median: 50°), that for STD was slightly increased (median: 81°), and that for AL was again reduced (median: 75°). Consequently, HPHI was confirmed to be the most wettable surface in both clean and limescale conditions. Finally, an analysis was undertaken evaluating the spreading factor and the reversible work of adhesion, which were in good agreement with the qualitative visual observations of the plates covered with limescale.

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Section: Static Contact Anglementioning

confidence: 99%

Section: Spreading Factor and Reversible Work Of Adhesionmentioning

confidence: 99%