Morphology-influenced wetting model of nanopore structures

Kim, Sunghan; Choi, Hyun Rim; Polycarpou, Andreas A.; Liang, Hong

doi:10.1007/s40544-016-0122-x

Cited by 8 publications

(7 citation statements)

References 32 publications

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“…Mathematical modelling of liquid droplets on textured heterogeneous surfaces and the involved thermodynamics are widely studied in literature. 111,[117][118][119][120][121][122][123][124][125] The Cassie-Baxter model in Equation ( 3) is used for theoretical modelling of liquid droplets on practical surfaces, that is, surfaces with large roughness of the order up to 30 μm 117 or very hydrophobic surfaces, 119 cos…”

Section: Surface Texture Considerations For Stfs and Contact Anglementioning

confidence: 99%

Super‐liquid‐repellent thin film materials for low temperature latent heat thermal energy storage: A comprehensive review of materials for dip‐coating

Muhumuza,

Eames

2024

Energy Storage

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When discharging latent heat thermal energy storage (LHTES) systems, performance is influenced by the formation and adherence of a solid layer of phase change material (PCM) on heat eXchange (HX) surfaces. Super‐liquid‐repellent thin films (STFs) may be able to reduce solidifying PCM adhesion on HX surfaces during discharging, delay PCM solidification to lower temperatures, and by modifying nucleation sites potentially enable long‐term seasonal thermal storage. Techniques employed previously to fabricate sintered polymeric STF coatings include chemical vapour deposition, dip‐coating, spray‐coating, spin‐coating, layer‐by‐layer (LbL) assembly, sol‐gel, anodizing, electrodeposition, electrospinning, so on. Dip‐coating is considered attractive for fabricating thin films on simple and complex surface geometries due to process maturity, scalability, flexibility and cost‐effectiveness. To identify suitable materials for preparing STFs on metal HX surfaces using the dip‐coating process, more than 200 journal articles published in English during the period 2010 to 2022 were reviewed and the potential role of STFs in LHTES applications was assessed. The review identified key areas and applications stimulating STF material developments and formulations. The dip‐coating of potential STF materials was classified under three major themes driving current research and development (R&D) activities, that is, high performance thin films, eco‐friendly thin films and fundamental research formulations. This review provides a platform from which to develop coatings and HX systems to enable the cost‐effective implementation of STFs for improved heat transfer in future mobile/stationery LHTES systems.

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Section: Surface Texture Considerations For Stfs and Contact Anglementioning

confidence: 99%

Super‐liquid‐repellent thin film materials for low temperature latent heat thermal energy storage: A comprehensive review of materials for dip‐coating

Muhumuza,

Eames

2024

Energy Storage

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“…This phenomenon originated from the pores of the AAO substrate, allowing control over the hydrodynamic flow in the inner droplet (figure 5). While the droplet underwent vaporization on the AAO substrate, two typical hydrodynamic flows occurred in the droplet: an outward capillary flow and a downward capillary flow [56][57][58]. The downward capillary flow occurred because of capillary action, which made the liquid penetrate the pores.…”

Section: Mechanism Of the Coffee-ring Effect Suppressionmentioning

confidence: 99%

“…However, these methods can result in substrate contamination due to the inclusion of additive materials (requiring special particle geometries), damage from heat treatment, or the low controllability of the stain pattern. Recently, the film uniformity has been enhanced using a porous substrate, which may be used to control the hydrodynamic flow of the droplet [56,57]. Such a porous substrate induces a downward capillary flow towards the pores, which then block the transfer of particles toward the edge of the droplet and a uniform GO film is obtained without any constraining conditions [58].…”

Section: Introductionmentioning

confidence: 99%

Tunable thickness and uniform drop deposition of graphene oxide on porous anodic aluminum oxide and a reliable thickness measurement technique

Cho

Kim

2021

Surf. Topogr.: Metrol. Prop.

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The pinned contact line of sessile droplets containing micro/nanoparticles on a substrate results in nonuniform depositions with noncontrollable thicknesses, thereby producing the coffee-ring effect. In this study, we demonstrated that the thickness of graphene oxide (GO) films can be engineered using porous anodic aluminum oxide (AAO) substrates to fabricate uniform GO films. The outstanding thickness controllability and uniformity of GO films were obtained via tailorable hydrodynamic flow in a sessile droplet due to the pores of the AAO substrate. Furthermore, we developed a novel approach for measuring the micro/nanoscale thicknesses of GO films using an optical microscope. The thicknesses of the deposited GO film, measured via optical microscopy, demonstrated good agreement with those obtained via atomic force microscopy. These findings are beneficial for GO film applications, such as in wearable sensors, filtration, inkjet printing.

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“…As discussed in our previous study, the surfaces of fabricated metallic porous nanostructures on porous alumina had a crown shape, which can be seen in Figs. 5(b) and 5(c) [42]. The crown shape of the nanostructures affected calculation of the contact area.…”

Section: Contact Area Analysis Between the Indenter Tip And The Metalmentioning

confidence: 99%

Morphology and electric potential-induced mechanical behavior of metallic porous nanostructures

2019

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Understanding mechanical behaviors influenced by electric potential and tribological contacts is important for verifying the robustness and reliability of applications based on metallic porous nanostructures in electrical stimulations. In this work, nickel-based metallic porous nanostructures were studied to characterize their mechanical properties and morphologically dependent contact areas during application of an electric potential using a nanoindenter. We observed that the indentation moduli of nickel-based metallic porous nanostructures were altered by pore size and application of electric potential. In addition, the structural aspects of the surface morphology of nickel-based porous nanostructures had a critical effect on the determination of contact area. We suggest that the relation between electric potential and the mechanical behaviors of metallic porous nanostructures can be crucial for building mechanically robust functional devices, which are influenced by electric potential. The morphological shape characteristics of metallic porous nanostructures can be alternative decisive factors for manipulation of tribological performance through regulation of contact area.

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Morphology-influenced wetting model of nanopore structures

Cited by 8 publications

References 32 publications

Super‐liquid‐repellent thin film materials for low temperature latent heat thermal energy storage: A comprehensive review of materials for dip‐coating

Super‐liquid‐repellent thin film materials for low temperature latent heat thermal energy storage: A comprehensive review of materials for dip‐coating

Tunable thickness and uniform drop deposition of graphene oxide on porous anodic aluminum oxide and a reliable thickness measurement technique

Morphology and electric potential-induced mechanical behavior of metallic porous nanostructures

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