The effect of drop volume on the apparent contact angle of hierarchical structured superhydrophobic surfaces

Ren, Shuai; Chen, Junwu; Jiang, Miao; Wang, Shengwu; Wan, Zhiyu; Xie, Yi; Li, Lee

doi:10.1016/j.colsurfa.2020.125849

Cited by 13 publications

(5 citation statements)

References 26 publications

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“…The SDC-100 video optical contact angle tester was used to measure the contact angle, and the measurement accuracy was ±0.1 °. Since the influence of droplet volume on the static contact angle is minimal [22], 5 μL droplets is used to measure the static contact angle. After 15~20 s, the software was used to trace the contour of the water drop and calculate the average of the left and right static contact angles.…”

Section: Experimental Materials and Methodsmentioning

confidence: 99%

Study on the Characteristics and Influencing Factors of Hydrophobicity Transfer of Superhydrophobic Coating

Ren

Liu

et al. 2022

KEM

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Insulators covered with superhydrophobic coatings have better anti-pollution flashover performance. In high-pollution areas, the superhydrophobic coating gets covered with a contamination layer. The droplets are in contact with the contamination layer instead of the superhydrophobic coating. However, there is still a lack of relevant research on the hydrophobicity of the contamination layer. It is not conducive to evaluating the functional performance of superhydrophobic insulators in high-pollution areas. Choose diatomite to simulate contamination. The effects of fouling time, environment temperature, diatomite density, and impurity (NaCl) on the hydrophobicity of the contamination layer are analyzed experimentally. The experiment results show that the diatomite layer becomes hydrophobic over time. The higher the temperature is, the faster the hydrophobicity of the contamination layer will increase, and the higher the peak value of the static contact angle will be. However, the diatomite density and the exitance of NaCl have little influence on the hydrophobicity of the diatomite layer. Furtherly, the composition of the superhydrophobic coating is found in the diatomite layer, which proves the existence of hydrophobicity transfer. According to theoretical analysis, the appearance of transfer will enhance the hydrophobicity of diatomite particles. When the angular coordinate of the liquid-protrusions-gas triple line is greater than 90°, the mechanical conditions for the diatomite particles carried away by the droplet can be satisfied. As a result, hydrophobic diatomite is attached to the droplets’ surface.

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Section: Experimental Materials and Methodsmentioning

confidence: 99%

Study on the Characteristics and Influencing Factors of Hydrophobicity Transfer of Superhydrophobic Coating

Ren

Liu

et al. 2022

KEM

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“…It was also demonstrated theoretically that only a small change in the three-phase line length was needed to re-balance the forces exerted to the droplet when its volume changed, so the contact ratio of solid-liquid and gas-liquid changed insignificantly, resulting in negligible change in CA. 112 Therefore, to reliably characterise surface wettability via CA and CAH measurements by sessile-drop goniometry, larger droplet should be preferably employed, and the volume of a few microliters is generally recommended.…”

Section: Review Articlementioning

confidence: 99%

Robust and durable liquid-repellent surfaces

et al. 2022

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“…The abscissas are the apparent water contact angles quantifying the surface wettability, and the ordinates are the radius of the coalesced droplets. The values of droplet size and apparent contact angle can be assumed to be independent, [32] therefore the influence of each parameter on the values of ∆E k can be independent as well to that of the other. The vertical dotted lines are the critical value indicators along which the value of ∆E k is zero.…”

Section: Analysis Of the Characteristics Of Critical Apparent Contact...mentioning

confidence: 99%

A comparative study of the self-propelled jumping capabilities of coalesced droplets on RTV surfaces and superhydrophobic surfaces

et al. 2021

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Understanding the mechanism of coalescence-induced self-propelled jumping behavior provides distinct insights in designing and optimizing functional coatings with self-cleaning and anti-icing properties. However, to date self-propelled jumping phenomenon has only been observed and studied on superhydrophobic surfaces, other than those hydrophobic surfaces with weaker but fairish water-repellency, for instance, vulcanized silicon rubber (RTV) coatings. In this work, from the perspective of thermodynamic-based energy balance aspect, the reason that self-propelled jumping phenomenon does not happen on RTV coatings is studied. The apparent contact angles of droplets on RTV coatings can be less than the theoretical critical values therefore cannot promise energy surplus for the coalesced droplets onside. Besides, on RTV and superhydrophobic surfaces, the droplet-size dependent variation characteristics of the energy leftover from the coalescence process are opposite. For the droplets coalescing on RTV coatings, the magnitudes of energy dissipations are more sensitive to the increase in droplet size, compared to that of released surface energy. While for superhydrophobic coatings, the energy generated during the coalescence process can be more sensitive than the dissipations to the change in droplet size.

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The effect of drop volume on the apparent contact angle of hierarchical structured superhydrophobic surfaces

Cited by 13 publications

References 26 publications

Study on the Characteristics and Influencing Factors of Hydrophobicity Transfer of Superhydrophobic Coating

Study on the Characteristics and Influencing Factors of Hydrophobicity Transfer of Superhydrophobic Coating

Robust and durable liquid-repellent surfaces

A comparative study of the self-propelled jumping capabilities of coalesced droplets on RTV surfaces and superhydrophobic surfaces

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