The durability of superhydrophobic films

Wang, Shing‐Dar; Jiang, Ya-Syuan

doi:10.1016/j.apsusc.2015.10.005

Cited by 19 publications

(3 citation statements)

References 47 publications

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“…In order to evaluate the stability of the treatments under rainy conditions, a simulated rain test was performed. 42 For this purpose, the samples were placed under a water column falling from 50 cm, with a flow around 45 mL•s −1 in increasing steps of discharged volumes.…”

Section: Methodsmentioning

confidence: 99%

A Simple, Long-Lasting Treatment for Concrete by Combining Hydrophobic Performance with a Photoinduced Superhydrophilic Surface for Easy Removal of Oil Pollutants

Carrascosa

Zarzuela

Badreldin

et al. 2020

ACS Appl. Mater. Interfaces

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Superhydrophobic surfaces present promising applications in the protection of building materials, such as the self-cleaning effect promoted by their high water-repellent properties. However, these surfaces easily lose their properties when exposed to oil contaminants. This is a critical weak point for their application in building facades, which are exposed to environmental pollutants such as hydrocarbons and vandalism (e.g., grafitti). A viable strategy to remove oils is to produce superhydrophilic surfaces, which present underwater superoleophobic behavior. In the case of buildings, the use of this strategy can be considered counterproductive because it promotes their interaction with water, the main vehicle of most decay agents. In this work, we have successfully combined the advantages of a superhydrophilic coating with a hydrophobic impregnation treatment, which prevents water ingress into the porous structure of the substrate. Specifically, a photoinduced superhydrophilic surface was produced on concrete by simple spraying of a starting sol containing TiO 2 NPs, which create a Cassie-Baxter state, a silica oligomer, producing a compatible matrix promoting good adhesion to the substrate and polydimethylsiloxane as a hydrophobic agent. After being exposed to sunlight, the treated surfaces switched from superhydrophobic (SCA 160°) to superhydrophilic (SCA < 10°). These surfaces presented underwater superoleophobicity (SCA 152°with CHCl 3 ) and oil-contaminated dust was easily cleaned without employing detergents. The photoactivation does not alter the protection against water absorption (>85% reduction). The treatment showed suitable adhesion to the substrate and good resistance to rainfall and outdoor exposure due to the presence of the hydrophobic silica matrix in the concrete pore structure.

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Section: Methodsmentioning

confidence: 99%

A Simple, Long-Lasting Treatment for Concrete by Combining Hydrophobic Performance with a Photoinduced Superhydrophilic Surface for Easy Removal of Oil Pollutants

Carrascosa

Zarzuela

Badreldin

et al. 2020

ACS Appl. Mater. Interfaces

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“…Actually, after long-contact with water, these groups should be hydrolyzed as for Do. This contradictory observation can be explained according to Wang et al [33]. These authors prepared superhydrophobic coatings on glass controlling the ratio of hydrolysable (ethoxy) and pre-hydrolyzed (hydroxyl) groups.…”

Section: Effectiveness Of the Products On Stonementioning

confidence: 99%

Modified Ethylsilicates as Efficient Innovative Consolidants for Sedimentary Rock

et al. 2018

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Although silicon alkoxides (especially ethylsilicates) have long been used as consolidants of weathered stone monuments, their physical properties are not ideal. In this study, an innovative procedure for the consolidation of sedimentary rocks was developed that combines the use of organometallic and alkylamine catalysts with the addition of well-defined nanoparticles exhibiting a narrow size distribution centered at ca. 10 nm. As a suitable test material, Pietra di Lecce limestone was selected because of its color and problematic physico-chemical properties, such as rather low hardness. Using the developed procedure, the mechanical and surface properties of the limestone were improved without the unwanted over-consolidation of the surface layers of the stone, and any significant deterioration in the pore size distribution, water vapor permeability, or the stone’s appearance. The developed modified ethylsilicates penetrated deeper into the pore structure of the stone than the unmodified ones and increased the hardness of the treated material. The formed xerogels within the stone pores did not crack. Importantly, they did not significantly alter the natural characteristics of the stone.

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“…However, there are many literatures that have reported the superhydrophobic surfaces with poor durability owing to experiencing multiple freeze-thaw cycles or subjecting in high humidity conditions (Bharathidasan et al, 2014;Chen et al, 2012;Dodiuk et al, 2012;Farhadi et al, 2011;Jung et al, 2011;Lazauskas et al, 2013;Kulinich et al, 2011;Nosonovskv et al, 2012). The superhydrophobic coating is weakened by various factors, including surface microstructure damage, surface contamination and et al (Boiniovivh et al, 2012;Farhadi et al, 2011;Kulinich et al, 2011;Lazauskas et al, 2013;Ozbay et al, 2016;Oberli et al, 2010;Mahadik et al, 2013;Shin et al, 2011;Wang et al, 2015;Zhu et al, 2014). Kulinich and co-workers (Kulinich and Farhadi, 2011) have investigated that the microstructure of the superhydrophobic surface gradually destroyed after the icing and de-icing experiment, and other researchers consider that the damaged microstructure of the superhydrophobic surfaces is caused by the compressive stress generated during ice expansion (Lazauskas et al, 2013;Oberli et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Disturbing stability of interface by adopting phase-change temperature gradient to reduce ice adhesion strength

Chen

Jin

et al. 2019

Cold Regions Science and Technology

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Water and its solution are regarded as the low temperature phase change energy released material. The study proposes a novel de-icing model that establishes the phase change temperature gradient at the interface to disturb the contact stability between the substrate surface and the covered ice. During the experiment, the pit with the same size was machined on the surface of aluminum alloy and PMMA which both regarded as the experimental materials and the ethanol solutions with the different freezing points were filled in the pits. The ice adhesion strength on the substrate was repeatedly tested under the different temperatures. The experimental results shown that the ice adhesion

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The durability of superhydrophobic films

Cited by 19 publications

References 47 publications

A Simple, Long-Lasting Treatment for Concrete by Combining Hydrophobic Performance with a Photoinduced Superhydrophilic Surface for Easy Removal of Oil Pollutants

A Simple, Long-Lasting Treatment for Concrete by Combining Hydrophobic Performance with a Photoinduced Superhydrophilic Surface for Easy Removal of Oil Pollutants

Modified Ethylsilicates as Efficient Innovative Consolidants for Sedimentary Rock

Disturbing stability of interface by adopting phase-change temperature gradient to reduce ice adhesion strength

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