Hydrophobicity and Superhydrophobicity in Fouling Prevention in Sea Environment

Ferrari, Michele; Cirisano, Francesca

doi:10.1002/9781119459996.ch11

Cited by 2 publications

(4 citation statements)

References 66 publications

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“…In Figure 1, the Abbott-Firestone curve is presented with all parameters related to the volume, included the void volume (Vv). This parameter was considered because of its nature, being related to the concept of entrapped air, describing the superhydrophobicity (Cassie-Baxter model [23,24]), which is connected to the biofouling control of immersed SHS.…”

Section: Materials and Surface Characterizationmentioning

confidence: 99%

“…Coatings 2019, 9, 303 4 of 14 superhydrophobicity (Cassie-Baxter model [23,24]), which is connected to the biofouling control of immersed SHS.…”

Section: Materials and Surface Characterizationmentioning

confidence: 99%

“…In both campaigns, the samples were immersed at the depth of about 10 cm with an angle of 180 • (coating face down with respect to the solar irradiation). This angle was chosen after the results were obtained from the test performed in the previous campaign on the fluoropolymer coating [24]. During the whole investigation period, macroscopic images of the superhydrophobic (SH) surfaces were taken with at a weekly periodicity with a Nikon D800 camera (Nikon Corporation, Tokyo, Japan).…”

Section: Exposure Environments and Expositionmentioning

confidence: 99%

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Superhydrophobic Coatings from Recyclable Materials for Protection in a Real Sea Environment

2019

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Recyclable materials can be referred to as both those materials directly recycled from wastes and those derived from any kind of transformation before use. Highly water repellent coatings with wettability properties, known as superhydrophobic (SH), are related to surfaces with contact angles above 150° and a very small hysteresis. The small area available for these surfaces when in contact with water can be exploited in many applications in which interactions with an aqueous environment are usually desirable to be avoided, like for protection and friction reduction in a marine environment. SH coatings under investigation have been prepared starting from recyclable materials with the aim to provide a sustainable and low cost solution, with potential application to large surfaces in a marine environment. Wetting studies, surface characterization, and electrochemical tests show how these surfaces can be used in terms of fouling prevention and the protection of metals in underwater conditions.

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Section: Materials and Surface Characterizationmentioning

confidence: 99%

“…Coatings 2019, 9, 303 4 of 14 superhydrophobicity (Cassie-Baxter model [23,24]), which is connected to the biofouling control of immersed SHS.…”

Section: Materials and Surface Characterizationmentioning

confidence: 99%

Section: Exposure Environments and Expositionmentioning

confidence: 99%

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Superhydrophobic Coatings from Recyclable Materials for Protection in a Real Sea Environment

2019

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“…The transitions may be categorized by the position of the air–water–solid contact lines, as schematically illustrated in Figure , where the roughness is drawn as a regular microstructure for simplicity and the states of overgrown air above the roughness are added to be complete. Because most underwater applications of SHPo surfaces, such as drag reduction − and antibiofouling, , require the surface roughness to be substantially filled with an air layer, called a “plastron”, it is highly desirable that the SHPo surface stays dewetted under water. Since the overgrowing air, Figure b, usually causes the contact lines to detach from the surface, leading to the overly dewetted state of Figure a, which is unstable, for most applications the desired state is the properly dewetted state of Figure c, which is commonly regarded as a Cassie–Baxter state.…”

Section: Introductionmentioning

confidence: 99%

Brightness of Microtrench Superhydrophobic Surfaces and Visual Detection of Intermediate Wetting States

Kiani

et al. 2021

Langmuir

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For a superhydrophobic (SHPo) surface under water, the dewetted or wetted states are easily distinguishable by the bright silvery plastron or lack of it, respectively. However, to detect an intermediate state between the two, where water partially intrudes the surface roughness, a special visualization technique has been needed. Focusing on SHPo surfaces of parallel microtrenches and considering drag reduction as a prominent application, we (i) show the reliance on surface brightness alone may seriously mislead the wetting state, (ii) theorize how the brightness is determined by water intrusion depth and viewing direction, (iii) support the theory experimentally with confocal microscopy and CCD cameras, (iv) present how to estimate the intrusion depth using optical images taken from different angles, and (v) showcase how to detect intermediate states slightly off the properly dewetted state by simply looking. The proposed method would allow monitoring SHPo trench surfaces without bulky instrumentsespecially useful for large samples and field tests.

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Hydrophobicity and Superhydrophobicity in Fouling Prevention in Sea Environment

Cited by 2 publications

References 66 publications

Superhydrophobic Coatings from Recyclable Materials for Protection in a Real Sea Environment

Superhydrophobic Coatings from Recyclable Materials for Protection in a Real Sea Environment

Brightness of Microtrench Superhydrophobic Surfaces and Visual Detection of Intermediate Wetting States

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