Applicability of Cassie–Baxter equation for superhydrophobic fluoropolymer–silica composite films

Cengiz, Uğur; Cansoy, C. Elif

doi:10.1016/j.apsusc.2015.02.033

Cited by 47 publications

(21 citation statements)

References 56 publications

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“…Besides advancing (θ a ), receding contact angles (θ r ), and contact angle hysteresis (CAH) values are essential in order to characterize the surface properties. 26,27,29,48 It is reported in the literature that the advancing contact angle of pure COC surface is between 101-104 0 and the receding contact angle is between 82-86 0. 51,57,65 The difference between advancing and receding contact angles is described as contact angle hysteresis (CAH, Δθ = θ a − θ r ), which is caused by surface roughness and surface chemical heterogeneity.…”

Section: Contact Angle Measurementsmentioning

confidence: 99%

“…The water and oil repellencies were investigated, and it is showed that the hydrophobicity increases with the increment of silica amount, but with hexadecane drops the contact angle decreased by addition high silica amounts. 48 Cyclic olefin copolymer (COC) is an amorphous polymer synthesized by chain polymerization of ethylene and norbornene using metallocene catalysts. Comonomer ratio can be arranged to have low or high glass-transition temperature (T g ) ranging from 33 to 180.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of superhydrophobic transparent cyclic olefin copolymer (COC)‐SiO₂ nanocomposite surfaces

Doğancı

2020

J of Applied Polymer Sci

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A superhydrophobic cyclic olefin copolymer (COC) nanocomposite coating was produced with a very simple and easy method. Self-cleaning superhydrophobic COC surfaces were obtained by only adding surface hydrophobized SiO 2 nanoparticles by dip coating method. The influence of concentration of SiO 2 and the coating temperatures on the wettability of the surfaces were investigated. The surface wettability of the coatings was examined with the contact angle measurements and the surface roughness and morphology were analyzed by using atomic force microscope and scanning electron microscopy analysis. Surfaces with certain amounts of COC and SiO 2 showed superhydrophobic character with high water contact angle of 169 0. Also, the obtained superhydrophobic surfaces show superior water repellent, high transparency, and self-cleaning characteristics.

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Section: Contact Angle Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fabrication of superhydrophobic transparent cyclic olefin copolymer (COC)‐SiO₂ nanocomposite surfaces

Doğancı

2020

J of Applied Polymer Sci

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“…16 characteristics of hydrophobicity can be enhanced. θ c is always larger than θ on the rough surface [14][15][16][17].…”

Section: Cassie-baxter Modelmentioning

confidence: 99%

Wettability on Different Surfaces

Kwok¹

2020

21st Century Surface Science - A Handbook

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Wettability has been explored for 100 years since it is described by Young’s equation in 1805. It is all known that hydrophilicity means contact angle (θ), θ < 90°; hydrophobicity means contact angle (θ), θ > 90°. The utilization of both hydrophilic surfaces and hydrophobic surfaces has also been achieved in both academic and practical perspectives. In order to understand the wettability of a droplet distributed on the textured surfaces, the relevant models are reviewed along with understanding the formation of contact angle and how it is affected by the roughness of the textured surface aiming to obtain the required surface without considering whether the original material is hydrophilic or hydrophobic.

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“…The addition of SiO2 sol (S1, S2, S3) leads to the formation of superficial nano-sized protrusions caused by the reaction of SiO2 and Ca(OH)2 on the concrete surface [37]. Using Regarding the Cassie-Baxter regime mentioned previously [36], a two-length-scale, micro-and nano-hierarchical surface roughness, and a hydrophobic surface are important to achieve super-hydrophobicity. Here, the super-hydrophobic effect was the consequence of the combination of the SiO 2 sol, which introduced the micro-and nano-roughness, and the silane emulsion, which provided the hydrophobic surface on the concrete.…”

Section: Effect Of Sio2 Sol/silane Emulsion On Water Absorption In Comentioning

confidence: 99%

Effect of SiO2 Sol/Silane Emulsion in Reducing Water and Chloride Ion Penetration in Concrete

Geng

Hou

et al. 2020

Coatings

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Here, a new concrete hydrophobic treatment method is developed using SiO2 sol and silane emulsion. The effectiveness of the modification for concrete protection is evaluated through testing water absorption and chloride diffusion. Two types of concrete with different strength grades (C40, C50) are used as the research object. The results show that the water capillary absorption coefficient and chloride ion diffusion coefficient of concrete decrease greatly under the protection of SiO2 sol and silane emulsion. Additionally, the protection effect is better with the increase of SiO2 consumption. Contact angle test results reveal that when the coating amount of SiO2 sol and silane emulsion is 300 g/m2, respectively, the contact angle reaches 150.2°, indicating the concrete (C40) surface reaches the superhydrophobic state. Through scanning electron microscope (SEM) observation, it is found that the hydrophobic effect of the SiO2 sol/silane emulsion is mainly due to the change in the surface morphology of concrete (C40).

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Applicability of Cassie–Baxter equation for superhydrophobic fluoropolymer–silica composite films

Cited by 47 publications

References 56 publications

Fabrication of superhydrophobic transparent cyclic olefin copolymer (COC)‐SiO₂ nanocomposite surfaces

Fabrication of superhydrophobic transparent cyclic olefin copolymer (COC)‐SiO₂ nanocomposite surfaces

Wettability on Different Surfaces

Effect of SiO2 Sol/Silane Emulsion in Reducing Water and Chloride Ion Penetration in Concrete

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Applicability of Cassie–Baxter equation for superhydrophobic fluoropolymer–silica composite films

Cited by 47 publications

References 56 publications

Fabrication of superhydrophobic transparent cyclic olefin copolymer (COC)‐SiO2 nanocomposite surfaces

Fabrication of superhydrophobic transparent cyclic olefin copolymer (COC)‐SiO2 nanocomposite surfaces

Wettability on Different Surfaces

Effect of SiO2 Sol/Silane Emulsion in Reducing Water and Chloride Ion Penetration in Concrete

Contact Info

Product

Resources

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Fabrication of superhydrophobic transparent cyclic olefin copolymer (COC)‐SiO₂ nanocomposite surfaces

Fabrication of superhydrophobic transparent cyclic olefin copolymer (COC)‐SiO₂ nanocomposite surfaces