Contact Angle Hysteresis

Dettre, Robert H.; Johnson, R. E.

doi:10.1021/ba-1964-0043.ch008

Cited by 271 publications

(115 citation statements)

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“…According to the experimental results of Dettre and Johnson by using pure solvents [19,22], the approximate profile of the receding contact angle against the roughness of the solid substrate is illustrated by two regimes, I and II, as shown in the inset in Figure 3. In regime II, no slip motion occurs because the receding contact angle increases with an increase in the roughness (i.e., the contact line is always pinned).…”

Section: Pinning Force and Receding Anglementioning

confidence: 95%

“…The receding contact angle r  is known to be related to the roughness of the solid surface [19]. The receding contact angle in this article means the initial receding contact angle that is a critical value for the slip motion of contact line to occur [21].…”

Section: Pinning Force and Receding Anglementioning

confidence: 99%

“…A thin layer of the solution starts to dewet from the center of the Petri dish when the thickness of the solution is less than the critical thickness for dewetting [18,19]. After the early dewetting process, the liquid layer with a meniscus is left along the wall of the Petri dish.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Quasi-logarithmic spacing law in dewetting patterns from the drying meniscus of a polymer solution

Chen

Suzuki

Mahara

et al. 2012

Chemical Physics Letters

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Section: Pinning Force and Receding Anglementioning

confidence: 95%

Section: Pinning Force and Receding Anglementioning

confidence: 99%

See 1 more Smart Citation

Quasi-logarithmic spacing law in dewetting patterns from the drying meniscus of a polymer solution

Chen

Suzuki

Mahara

et al. 2012

Chemical Physics Letters

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“…(For more information on other limitations, see the article in this issue by Geo et al) Johnson and Dettre 17,[21][22][23][24] proposed a model in which the rough surface causes metastable local minimum states that trap the three-phase contact line. Their model correctly predicts both the advancing and receding contact angles and the hysteresis between them, which phenomenologically corresponds to observed behavior, 22,25,26 as shown graphically in Figure 1a.…”

Section: Introductionmentioning

confidence: 99%

Bioinspired Materials for Self-Cleaning and Self-Healing

Youngblood¹,

Sottos²

2008

MRS Bull.

109

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Biological systems have the ability to sense, react, regulate, grow, regenerate, and heal. Recent advances in materials chemistry and micro-and nanoscale fabrication techniques have enabled biologically inspired materials systems that mimic many of these remarkable functions. This issue of MRS Bulletin highlights two promising classes of bioinspired materials systems: surfaces that can self-clean and polymers that can self-heal. Self-cleaning surfaces are based on the superhydrophobic effect, which causes water droplets to roll off with ease, carrying away dirt and debris. Design of these surfaces is inspired by the hydrophobic micro-and nanostructures of a lotus leaf. Self-healing materials are motivated by biological systems in which damage triggers a site-specific, autonomic healing response. Self-healing has been achieved using several different approaches for storing and triggering healing functionality in the polymer. In this issue, we examine the most successful strategies for self-cleaning and self-healing materials and discuss future research directions and opportunities for commercial applications. Bioinspired Materialsfor Self-Cleaning and Self-Healing Jeffrey P. Youngblood and Nancy R. Sottos, Guest Editors water droplets. 11-13 Self-healing materials are inspired by living systems in which minor damage (e.g., a contusion or bruise) triggers an autonomic healing response. Successful healing relies on seamless integration of reactive chemical functionality into a polymer or polymer composite at the microscale, nanoscale, or molecular level. Although these two functions are quite different, together they represent the wide range of autonomic responses achievable through bioinspired design. In this article, we separately introduce the key elements of self-cleaning and self-healing materials systems and identify the scientific challenges and successful strategies for continued advancement of these nascent fields. Self-Cleaning SurfacesInterest in self-cleaning surfaces has been rekindled because of the newfound ability to structure surfaces on the submicron scale over large planar areas relevant to macroscale wetting. These structured surfaces allow the so-called "lotus-leaf effect," whereby water droplets are shed easily from certain structures, carrying away dirt and other debris. 11-13 Such bioinspired topographical methods toward self-cleaning are the focus of this review.

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“…R Ⱥ ≤ ≤ θ θ θ Systematic study of the effect of the surface roughness on the contact angle hysteresis is carried out in [10]. The water drop spreading over surfaces with fluorocarbon and paraffin coatings was under investigation.…”

Section: Introductionmentioning

confidence: 99%