Hydrophobicity and Sliding Behavior of Liquid Droplets on the Fluorinated Latex Films

Ha, Jong‐Wook; Park, In Jun; Lee, Soo-Bok

doi:10.1021/ma0488764

Cited by 125 publications

(87 citation statements)

References 49 publications

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“…For a smooth hydrophobic surface, a surface with low surface energy provides a small sliding angle. However, for fl uorocarbon-based hydrophobic surfaces, the sliding angle is commonly large despite a large contact angle [52][53][54]. Unlike the contact angle, the sliding angle is strongly aff ected by the alignment and continuity of the three-phase contact line [9,32,55].…”

Section: Dynamic Hydrophobicitymentioning

confidence: 99%

Design of hydrophobic surfaces for liquid droplet control

Nakajima

2011

NPG Asia Mater

142

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During rainfall, small water droplets can be observed to roll off hydrophobic umbrella surfaces at diff erent speeds. A droplet on a round hydrophobic surface does not always slide down on the surface easily at a small tilt angle, but even if it does, large moving acceleration is not always observed. What determines the motion of droplets on solid surfaces?Diff erences in droplet shape on solid surfaces are often explained by variations in wettability. Th e wetting of a solid surface has persisted through the ages as a research subject at the border between physics and chemistry. Wettability control of a solid against a liquid has been widely explored in industry for application in daily life because it can engender various physical and chemical phenomena related to solids and liquids. Wettability is an important property of solid surfaces from both fundamental and practical aspects. Th e degree of adhesion of liquid droplets onto a solid surface is commonly described in terms of the contact angle (θ), which is given by Young's equation aswhere γ sv , γ sl , and γ lv represent the interfacial free energies per unit area of the solid-gas, solid-liquid and liquid-gas interfaces. Although the defi nition and measurement of the contact angle are simple and easy, the nature of wettability is complex because it is related to three phases: solid, liquid and gas. Moreover, various factors aff ect the surface wettability of a solid. When one factor of a solid surface such as roughness is altered, other factors such as the surface topography or its chemical composition often change simultaneously. Th erefore, it is usually diffi cult to discuss the results of surface wettability obtained from experiments while retaining academic rigor. Th e main research interest for industrial materials is the behavior of millimeter-size droplets on a solid surface of more than a few centimeters in area. Th erefore, the discussion of wettability among samples with great diff erences in surface character is sometimes conducted with ignorance of the infl uence of other characteristics.Hydrophobic coatings are extremely important for wettability control. Th e coatings are anticipated for various industrial uses such as anti-wetting, anti-snow (or ice), anti-rust and reduced friction resistance by reducing solid-liquid interaction. Generally, a hydrophobic surface is one on which water forms a round droplet that is easily removed. Recent advances in probe microscopy and surface spectroscopy and the wider availability of such techniques have revealed that macroscopic surface hydrophobicity, especially dynamic hydrophobicity, is aff ected by nanolevel characteristics such as structure, chemical composition and their alignment and homogeneity. Th e expected properties for a hydrophobic surface cannot always be obtained unless precise design and control of the solid surface are applied. Th is report presents the results of recent studies on the design of hydrophobic surfaces for droplet removal or control from the viewpoint of materials science....

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Section: Dynamic Hydrophobicitymentioning

confidence: 99%

Design of hydrophobic surfaces for liquid droplet control

Nakajima

2011

NPG Asia Mater

142

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“…[15,16] CA of emulsion film prepared without organic silicon is presented in Figure 4(a). CA of emulsion film prepared with moderate amount of organic silicon is given in Figure 4(b).…”

Section: Ca Of Filmmentioning

confidence: 99%

Synthesis and characterization of novel acrylate emulsion containing phosphorus and silicon prepared via semi-continuous seeded emulsion polymerization

Jiang

Chen

2014

Designed Monomers and Polymers

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The novel acrylate emulsion containing phosphorus and silicon was prepared successfully via semi-continuous seeded emulsion polymerization. The conditions of synthesizing the novel emulsion were optimized. The films of the resultant emulsion were characterized by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and contact angle (CA) determinator, respectively. Results show that the optimal condition synthesizing the novel emulsion was that the amount of PAM-200 is 2.00 g and the suitable way of adding KH-570 was to add KH-570 into the reaction after all other monomers were added and the optimal amount was 3.00%. Both FTIR and DSC confirm that the novel emulsion has been prepared successfully. CA indicates that the water resistance of emulsion film is improved clearly.

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“…To overcome these problems, surfmers (surface-active monomers), watersoluble monomers, or polymeric surfactants as emulsifiers are being replaced with traditional surfactants [5][6][7] and functional monomers and surfactants such as silicone-and fluorinecontaining ones [8][9][10][11] are being studied in both industry and academia. In such cases, the effects of emulsifiers and other additives were diminished but not inhibited.…”

Section: Introductionmentioning

confidence: 99%

Quick-drying, protective coating of papers with poly(methacrylate) latices containing alkali-hydrolysable emulsifiers

et al. 2011

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Surfaces of filter papers pretreated with sodium carbonate were coated with poly(methacrylate) latices containing alkali-hydrolysable or non-hydrolysable cationic emulsifiers by a simple drop-coating method and their surface properties were investigated.Determination of fixed amounts of polymers and observation of the paper surfaces suggest that glass transition temperature of the polymers and hydrolysability of the emulsifier are dominant factors for the coating. The latices of poly(2-ethylhexyl methacrylate) containing the hydrolysable emulsifier could coat the paper surface almost perfectly and smoothly, making it quick drying and water repellent.

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Hydrophobicity and Sliding Behavior of Liquid Droplets on the Fluorinated Latex Films

Cited by 125 publications

References 49 publications

Design of hydrophobic surfaces for liquid droplet control

Design of hydrophobic surfaces for liquid droplet control

Synthesis and characterization of novel acrylate emulsion containing phosphorus and silicon prepared via semi-continuous seeded emulsion polymerization

Quick-drying, protective coating of papers with poly(methacrylate) latices containing alkali-hydrolysable emulsifiers

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