Theoretical Contact Angles on a Nano-Heterogeneous Surface Composed of Parallel Apolar and Polar Strips

Fang, Changpeng; Drelich, Jaroslaw

doi:10.1021/la0364587

Cited by 21 publications

(13 citation statements)

References 16 publications

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“…This has been ascribed to the fact that the contact angle is determined rather by the interaction arising at the liquid/solid contact line 22. 23 However, in the present case of nanometric heterogeneity, we can safely assume that the proportion of hydrophobic domains crossed by the contact line is very close to the corresponding area fraction. It confirms that such systems are only composed of nanometer‐sized domains.…”

Section: Resultsmentioning

confidence: 93%

Surface Nanopatterning by Organic/Inorganic Self‐Assembly and Selective Local Functionalization

Fisher

Kuemmel

Järn

et al. 2006

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Patterning silicon surfaces by well-ordered nanoperforated TiO(2) layers is achieved through a simple block copolymer-assisted liquid deposition technique followed by direct thermal treatment. The crater diameters are tuned between 10 and 50 nm, depending on the molecular weight of the surfactant patterning agent. The formation mechanism of such systems is discussed. The present nanopatterned heterogeneous surfaces (nanoholes with SiO(2) bottom surfaces and TiO(2) walls) are selectively functionalized with two different perfluorinated organic groups. The accessibility to the substrate surface through such nanoholes and the selective distribution of both functions on the surface is evidenced by water-contact-angle measurements, which satisfactorily verify the Cassie relationship. Such systems have wide application prospects in varied fields such as nanotechnology and engineering.

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Section: Resultsmentioning

confidence: 93%

Surface Nanopatterning by Organic/Inorganic Self‐Assembly and Selective Local Functionalization

Fisher

Kuemmel

Järn

et al. 2006

Small

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“…The definition of “large enough” is a function of the liquid surface tension and of the quality of the heterogeneity, meaning the difference between the Young contact angles formed by the probe liquid with the different surface chemistries,

Δ θ_{Y}

. It decreases if

γ_{\lg}

and

Δ θ_{Y}

increase . It ranges from 6–12 nm (

γ_{\lg}

= 70 mN

\cdot

^{-} 1

Δ θ_{Y}

= 70

^{°}

) to

\sim

0.1

μ

(

γ_{\lg}

= 50 mN

\cdot

^{-} 1

Δ θ_{Y}

= 10

^{°}

) …”

Section: Uncertaintymentioning

confidence: 99%

Experimental methods in chemical engineering: Contact angles

et al. 2019

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The contact angle (CA) formed at equilibrium at the three‐phase line of contact between a liquid, a solid, and a gas may be expressed as a function of both the interfacial and surface tensions. Young first derived this thermodynamic relationship in 1805. In practice, multiple CA values are observed due to kinetic phenomena induced by evaporation, vapour adsorption, or swelling, and thermodynamic ones induced by roughness and surface chemical heterogeneities, even at molecular‐scale. These non‐ideal conditions result into an hysteresis, i.e., a difference between wetting and dewetting behaviours, and Young's equation rarely applies. Three measuring methods stand out for their applicability and reliability. In the sessile drop method, a syringe deposits a liquid drop on a flat surface and the contact angle is measured through optical means based on the drop shape. In the Wilhelmy balance method, the force required to immerse a solid plate in a bath of liquid is indirectly related to the contact angle. In the Washburn capillary rise method, the contact angle is derived from the rate at which a liquid rises by capillarity through a packed bed of powder. Employing probe liquids of various polarities, the free surface energy of the solid may be estimated. Over the last two years, ∼8600 published articles mentioned “contact angle” in their topic. Their main focus was either to develop the fundamental understanding of wetting science, or to assess the success of surface modification methods for the production of novel surfaces, composites, and membranes with enhanced wetting, adhesive, and filtration properties.

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“…For instance impurities on mineral surfaces often dictate aggregation [15][16][17][18], while small chemical features on polymer surfaces control contact angle and wetting [19][20][21], produce membrane fouling [22,23], enhance engineering adhesion [8,24,25], and determine biomaterial effectiveness [26][27][28][29][30]. Intracellular surface heterogeneities even govern biological processes such as the initial phases of leukocyte adhesion [31,32].…”

Section: Introductionmentioning

confidence: 99%

The impact of nanoscale chemical features on micron-scale adhesion: Crossover from heterogeneity-dominated to mean-field behavior

Duffadar

Kalasin

Davis

et al. 2009

Journal of Colloid and Interface Science

141

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Theoretical Contact Angles on a Nano-Heterogeneous Surface Composed of Parallel Apolar and Polar Strips

Cited by 21 publications

References 16 publications

Surface Nanopatterning by Organic/Inorganic Self‐Assembly and Selective Local Functionalization

Surface Nanopatterning by Organic/Inorganic Self‐Assembly and Selective Local Functionalization

Experimental methods in chemical engineering: Contact angles

The impact of nanoscale chemical features on micron-scale adhesion: Crossover from heterogeneity-dominated to mean-field behavior

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