The investigation of the wetting behavior on the red rose petal

Jin, Haiyun; Li, Yufeng; Zhang, Peng; Nie, Shichao; Gao, Nong

doi:10.1063/1.4947057

Cited by 23 publications

(9 citation statements)

References 37 publications

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“…The pinned water drops adhere to plants and flowers until complete evaporation, enabling plants to thrive in humid environments . The adhesive superhydrophobicity of rose petals is attributed to their architecture, which consists of periodic microarrays measuring 25 µm in height and 10 µm in diameter, and wrinkles measuring 1 µm in width on top of these microarrays (Figure b) . Both the large liquid–solid contact area and the high liquid–solid affinity result in water sticking.…”

Section: Discovery: Natural Surfacesmentioning

confidence: 99%

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Bioinspired Superwettability Micro/Nanoarchitectures: Fabrications and Applications

Kong

Luo

Zhao

et al. 2019

Adv Funct Materials

150

104

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Biological systems have evolved over billions of years to develop wetting strategies for advantageous structure-property-performance relations that are crucial for their survival. The discovery of these intriguing relationships has inspired tremendous efforts to investigate the micro/nanoscale features of naturally occurring structures with superwettability. Researchers have since developed new methods and techniques to construct artificial materials that mimic natural structures and functionalities. Here, a brief review of natural hierarchical architectures with liquid repellent properties is presented, and the critical underlying mechanism is summarized with an emphasis on the micro/nanoscopic architectures. The state-of-the-art micro/nanofabrication techniques for creating bioinspired hierarchical superwettability structures that are categorized by random and exquisite features are also reviewed, followed by an overview of their emerging applications, with special attention to biomedical-related fields. The development of fabrication techniques enhances capabilities relative to those of living systems, paving the way toward advanced structural materials with superior functions and unprecedented characteristics for potential applications. Figure 1. Natural superwettable surfaces. Scanning electronic microscopy (SEM) images demonstrate the surface micro/nanostructures of a) lotus leaf, [4] b) Salvinia molesta, [115] c) cicada wings, [109] d) mosquito eye, [37] e) cactus spines, [110] f) desert beetle, [2] g) water strider, [5] h) springtail skin, [145] and i) pitcher plant. [50] The examples represent a range of different intelligent surfaces that exist in nature. Reproduced with permission. [4]

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Section: Discovery: Natural Surfacesmentioning

confidence: 99%

“…Both the large liquid–solid contact area and the high liquid–solid affinity result in water sticking. These surfaces with the ability to retain liquids are useful templates for fabricating sticky synthetic surfaces …”

Section: Discovery: Natural Surfacesmentioning

confidence: 99%

Bioinspired Superwettability Micro/Nanoarchitectures: Fabrications and Applications

Kong

Luo

Zhao

et al. 2019

Adv Funct Materials

150

104

View full text Add to dashboard Cite

show abstract

“…Although it was postulated that high apparent CA and high adhesion exhibited by surfaces could be explained by a mixed wetting state, there has been no direct experimental evidence or visualization of these hypothesized wetting states on a rose petal. One recent study visualized the wetting state on a rose petal using top‐down optical microscopy, and postulated the trapping of air at the surface; however, it is difficult to view the liquid–air and liquid–solid interfaces underneath the droplet using this technique. Progress has been made on visualizing the liquid–air and liquid–solid interfaces between and below condensing droplets and moving droplets on microstructured surfaces using scanning electron microscopy (SEM).…”

Section: Introductionmentioning

confidence: 99%

The Wetting State of Water on a Rose Petal

Chakraborty

Weibel

Schaber

et al. 2019

Adv Materials Inter

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However, surfaces with a high contact angle (CA > 150°) can also exhibit "sticky" behavior characterized by high CAH; such surfaces are termed parahydrophobic. [7] A rose petal is a prime example exhibiting such parahydrophobic behavior; this socalled petal effect [8] has attracted significant research attention [7] in an attempt to understand this somewhat puzzling wetting state.Research over the last two decades has led to noteworthy progress in the synthesis of functional surfaces inspired by nature. [9] Self-cleaning surfaces inspired by the lotus leaf [10] have potential applications in enhancing the efficiency of solar cells, reducing surface drag, enhancing fluidic transport, and preventing water corrosion of batteries and fuel cells. [5] Surfaces exhibiting the petal effect have been proposed for separation processes [11] and collection of water via directional liquid transport. [12][13][14] It has also been recently demonstrated that parahydrophobic surfaces are ideal for facilitating bubble nucleation and departure during boiling. [15,16] Models of the wetting state are typically used to design surface topologies that provide the desired wetting characteristics. [17] Unlike the lotus leaf, for which the wetting state has been confirmed and is well accepted, [4] a recent review of the current understanding of parahydrophobic surfaces reveals a lack of experimental evidence to confirm the postulated wetting states on the rose petal. [7] As the surface morphology of natural surfaces is typically complex, and the features themselves delicate, it is difficult to obtain an accurate characterization of the microscopic wetting state. The existing explanation of the petal effect is based on a partially wetting "Cassie-impregnating" state. [7] The Cassieimpregnating wetting state is adapted to the dual-scale surface features of the rose petal, [18] namely, microscale papillae (bumps) with nanoscale striae (folds) [18] on top of each micropapilla. [19] Water droplets on the petal are thought to penetrate the gap between micro-papillae but not wet the nanoscale features. Although it was postulated that high apparent CA and high adhesion exhibited by surfaces could be explained by a mixed wetting state, [20] there has been no direct experimental evidence or visualization of these hypothesized wetting states on a rose petal. One recent study visualized the wetting state on a rose petal using top-down optical microscopy, [21] and postulated the trapping of air at the surface; however, it is difficult to view the liquid-air and liquid-solid interfaces underneath the droplet using this technique. Progress has been made on visualizing the liquid-air and liquid-solid interfaces between and below condensing droplets [22,23] and moving droplets [24] on microstructured surfaces using scanning electron microscopy (SEM).The rose petal features surface structures that offer unique wetting properties. A water droplet placed on a rose petal forms a high contact angle but exhibits significant contact angle hysteresis, such that re...

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“…Parahydrophobic surfaces are textured hydrophobic surfaces that exhibit high static contact angles as well as high contact angle hysteresis. This wetting behavior, commonly known as the "petal effect", has recently come to the attention of the scientific community due to it being observed on natural surfaces such as the rose petal [36,37] and the peanut leaf [38], among others [39]. Water droplets placed on a parahydrophobic surface can remain adhered even when the surface is inverted, despite having contact angles approaching or exceeding 150°.…”

Section: Introductionmentioning

confidence: 99%

The petal effect of parahydrophobic surfaces offers low receding contact angles that promote effective boiling

Allred

Weibel

Garimella

2019

International Journal of Heat and Mass Transfer

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Despite extensive study of boiling processes and their widespread use in industry, critical interactions between the fluid and surface during boiling remain poorly understood. Simplistic, static descriptions of the contact angle are still relied upon to describe the effects of surface wettability on dynamic interfacial processes that govern boiling. This work demonstrates the critical role of the dynamic wettability characteristics of a surface on bubble growth dynamics and boiling performance. In spite of their superior nucleation behavior, hydrophobic surfaces have received little attention for boiling applications due to their typically premature transition from efficient nucleate boiling to inefficient film boiling. Evaluation of hydrophobic surfaces with high contact angle hysteresis reveals that the heat transfer efficacy of these surfaces can be exploited in boiling, so long as the receding contact angle of the surface is sufficiently small to mitigate vapor spreading and thereby extend the nucleate boiling regime. A new paradigm of textured boiling surfaces-parahydrophobic surfaces that exhibit the "petal effect" and mimic the wetting behavior of a rose petal-are shown to have untapped potential in boiling applications resulting from highly hydrophobic behavior coupled with low receding contact angles.

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The investigation of the wetting behavior on the red rose petal

Cited by 23 publications

References 37 publications

Bioinspired Superwettability Micro/Nanoarchitectures: Fabrications and Applications

Bioinspired Superwettability Micro/Nanoarchitectures: Fabrications and Applications

The Wetting State of Water on a Rose Petal

The petal effect of parahydrophobic surfaces offers low receding contact angles that promote effective boiling

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