Contact angle measurement for LiBr aqueous solutions on different surface materials used in absorption systems

Martinez-Urrutia, Asier; Arroiabe, Peru Fernandez; Ramírez, M. A.; Martinez‐Agirre, Manex; Bou-Ali, M. Mounir

doi:10.1016/j.ijrefrig.2018.05.041

Cited by 36 publications

(13 citation statements)

References 24 publications

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“…The WCA were sensitive to many factors, mainly to surface chemical composition and roughness. The values observed for bare supports were 65° for Al and around 80° for TFS and ETP, which were comparable to those reported in the literature [35][36][37][38][39]. After coating, the initial WCA (WCAo) value increased slightly, i.e., about 6°…”

Section: Surface Wettability and Solubility Of Polyaleuritate Coatingssupporting

confidence: 88%

Bio-Based Coatings for Food Metal Packaging Inspired in Biopolyester Plant Cutin

et al. 2020

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Metals used for food canning such as aluminum (Al), chromium-coated tin-free steel (TFS) and electrochemically tin-plated steel (ETP) were coated with a 2–3-µm-thick layer of polyaleuritate, the polyester resulting from the self-esterification of naturally-occurring 9,10,16-trihydroxyhexadecanoic (aleuritic) acid. The kinetic of the esterification was studied by FTIR spectroscopy; additionally, the catalytic activity of the surface layer of chromium oxide on TFS and, in particular, of tin oxide on ETP, was established. The texture, gloss and wettability of coatings were characterized by AFM, UV-Vis total reflectance and static water contact angle (WCA) measurements. The resistance of the coatings to solvents was also determined and related to the fraction of unreacted polyhydroxyacid. The occurrence of an oxidative diol cleavage reaction upon preparation in air induced a structural modification of the polyaleuritate layer and conferred upon it thermal stability and resistance to solvents. The promoting effect of the tin oxide layer in such an oxidative cleavage process fosters the potential of this methodology for the design of effective long-chain polyhydroxyester coatings on ETP.

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Section: Surface Wettability and Solubility Of Polyaleuritate Coatingssupporting

confidence: 88%

Bio-Based Coatings for Food Metal Packaging Inspired in Biopolyester Plant Cutin

et al. 2020

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“… The entire condensing surface is covered by condensate; hence a completely wet copper surface is assumed and no condensate movement in the form of rivulets exists. This assumption is backed up by the typical equilibrium contact angle of a water droplet on a copper surface in the presence of air at 20°C to be ∼60–70° ( Chougule and Sahu, 2016 ; Martinez-Urrutia et al., 2018 ). Furthermore, as the water surface tension decreases with increasing water temperature, so does the contact angle ( Song and Fan, 2021 ).…”

Section: Resultsmentioning

confidence: 99%

Condensation of water vapor from humid air inside vertical channels formed by flat plates

Poredoš¹,

Petelin²,

Vidrih³

et al. 2022

iScience

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Summary Condensation of humid air is an important process in thermal and process engineering and a subject of many currently research-intensive scientific domains, such as atmospheric water harvesting and seawater desalination. The nature of (water) vapor condensation in the presence of non-condensable gas (NCG) such as air differs significantly from the case with the pure, quiescent vapor condensation. In the literature, simple models that describe the forced flow condensation of water vapor in the presence of air on a series of vertical flat plates are hard to find. Here we present a simple and computationally efficient semi-empirical correlation describing forced flow condensation from humid air inside vertical channels formed by flat plates. The correlation accounts air as a non-condensing gas, different heights of vertical plates, and different thermal-hydraulic parameters. The correlation has been experimentally validated and shows excellent agreement, as 90% of theoretically predicted values are within ±12% of experimental data.

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“…Water shows a hydrophilic or mixed-wettability character with conventional materials employed in CLs (θ ≤ 90°). The contact angle is lower for metals, such as Pt, stainless steel and TiO 2 (θ Pt ≈ 40°, θ ss ≈ 65°, θ TiO 2 ≈ 72°), and higher for carbon and Aluru, 2009;Martinez-Urrutia et al, 2018;Liu et al, 2021). Hydrophobic contact angles can be achieved with graphene (θ gr ≈ 95 • − 100 • ) (Taherian et al, 2013).…”

Section: Assumptionsmentioning

confidence: 99%

On the optimal cathode catalyst layer for polymer electrolyte fuel cells: Bimodal pore size distributions with functionalized microstructures

2022

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A high advancement has been achieved in the design of proton exchange membrane fuel cells (PEMFCs) since the development of thin-film catalyst layers (CLs). However, the progress has slowed down in the last decade due to the difficulty in reducing Pt loading, especially at the cathode side, while preserving high stack performance. This situation poses a barrier to the widespread commercialization of fuel cell vehicles, where high performance and durability are needed at a reduced cost. Exploring the technology limits is necessary to adopt successful strategies that can allow the development of improved PEMFCs for the automotive industry. In this work, a numerical model of an optimized cathode CL is presented, which combines a multiscale formulation of mass and charge transport at the nanoscale (∼10nm) and at the layer scale (∼1μm). The effect of exterior oxygen and ohmic transport resistances are incorporated through mixed boundary conditions. The optimized CL features a vertically aligned geometry of equally spaced ionomer pillars, which are covered by a thin nanoporous electron-conductive shell. The interior surface of cylindrical nanopores is catalyzed with a Pt skin (atomic thickness), so that triple phase points are provided by liquid water. The results show the need to develop thin CLs with bimodal pore size distributions and functionalized microstructures to maximize the utilization of water-filled nanopores in which oxygen transport is facilitated compared with ionomer thin films. Proton transport across the CL must be assisted by low-tortuosity ionomer regions, which provide highways for proton transport. Large secondary pores are beneficial to facilitate oxygen distribution and water removal. Ultimate targets set by the U.S. Department of Energy and other governments can be achieved by an optimization of the CL microstructure with a high electrochemical surface area, a reduction of the oxygen transport resistance from the channel to the CL, and an increase of the catalyst activity (or maintaining a similar activity with Pt alloys). Carbon-free supports (e.g., polymer or metal) are preferred to avoid corrosion and enlarge durability.

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Contact angle measurement for LiBr aqueous solutions on different surface materials used in absorption systems

Cited by 36 publications

References 24 publications

Bio-Based Coatings for Food Metal Packaging Inspired in Biopolyester Plant Cutin

Bio-Based Coatings for Food Metal Packaging Inspired in Biopolyester Plant Cutin

Condensation of water vapor from humid air inside vertical channels formed by flat plates

On the optimal cathode catalyst layer for polymer electrolyte fuel cells: Bimodal pore size distributions with functionalized microstructures

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