A low-cost filler-dissolved process for fabricating super-hydrophobic poly(dimethylsiloxane) surfaces with either lotus or petal effect

Lin, Yung Tsan; Chou, Jung-Hua

doi:10.1088/0960-1317/24/5/055021

Cited by 8 publications

(5 citation statements)

References 30 publications

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“…Similarly, the effect of surface roughness is not straightforward, as becomes obvious when comparing the ‘petal effect’ ( Feng et al , 2008 ; Janairo et al , 2016 ) and the ‘lotus effect’ ( Barthlott and Neinhuis, 1997 ; Schulte et al , 2011 ). In both cases, hierarchical surface structures result in apparent contact angles >150°, but depending on the aspect ratio, namely the height-to-distance ratio of the asperities, drops either stick or bead off ( Bhushan and Jung, 2008 ; Lin and Chou, 2014 ; Gong et al , 2015 ).…”

Section: Introductionmentioning

confidence: 99%

An ecological perspective on water shedding from leaves

Lenz

Bauer

Ruxton

2021

Journal of Experimental Botany

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Water shedding from leaves is a complex process depending on multiple leaf traits interacting with rain, wind and air humidity, and with the entire plant and surrounding vegetation. Here, we synthesise the current knowledge of the physics of water shedding with implications for plant physiology and ecology. We argue that the drop retention angle is a more meaningful parameter to characterise the water shedding capacity of leaves than the commonly measured static contact angle. The understanding of the mechanics of water shedding is largely derived from laboratory experiments on artificial rather than natural surfaces, often on individual aspects such as surface wettability or drop impacts. In contrast, field studies attempting to identify the adaptive value of leaf traits linked to water shedding are largely correlative in nature, with inconclusive results. We make a strong case for taking the hypothesis-driven experimental approach of biomechanical lab studies into a real-world field setting to gain a comprehensive understanding of leaf water shedding in a whole-plant ecological and evolutionary context.

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Section: Introductionmentioning

confidence: 99%

An ecological perspective on water shedding from leaves

Lenz

Bauer

Ruxton

2021

Journal of Experimental Botany

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“…Surfaces with very large contact angles can be created in a variety of manners, in many cases inspired by Nature itself . For example, one may create a rough surface by abrading fluorinated hydrophobic materials − or use particulates to create rough surfaces in curable liquid polymers such as polydimethylsiloxane. − In the current study, abrasion is chosen since it can be applied with very simple means to existing surfaces to get reasonably repeatable results when it comes to surface statistics and wetting. This further allowed a study of the triboelectric charge that formed when water droplets moved over the rough surface with different types of electrodes.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Microscale Surface Roughness on Water-Droplet Contact Electrification

Helseth

2019

Langmuir

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When water comes in contact with a hydrophobic fluoropolymer, a triboelectric charge tends to form on the surface. Here, it is investigated how the triboelectric charge formed upon contact with water drops depends on the microscale surface statistics of the polymer. In particular, it is found that the transition to a superhydrophobic fakir state results in a considerable reduction in triboelectric contact charge, due to a reduced liquid–solid contact area. Thus, when processing charge-sensitive electronic systems one may want to utilize such surfaces promoting reduced tribocharging. This also has implications for energy harvesting purposes, where one may collect electrical energy by letting water droplets move on the polymer with an interdigitated current-collecting electrode on its back side. In such a situation, it is observed that the surfaces promoting the superhydrophobic fakir state give rise to larger water droplet velocities and smaller collected charge, which explains the need for careful assessment of surface treatment before applying microstructured polymers for water droplet energy harvesting.

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“…Figures 7(a)-(c) shows the AFM topographies of the BNNT-PDMS nanocomposites surfaces. Pure PDMS resin does not exhibit a petal effect and surface texturing is required to display the phenomenon [16,19]. Figure 7(a) depicts the 3D surface of the nanocomposite with 0.5 wt% BNNT.…”

Section: Investigation Of the Wetting Regimementioning

confidence: 99%

“…Previous literature on this phenomenon involved experimental investigations on naturally available rose petals [10][11][12]. Petal effect can be achieved by having a rough [13,14] or textured surface [15][16][17]. To fabricate such surfaces, researchers have employed several techniques such as using natural rose petals [10,11,18] and sandpaper [19] as molds, plasma spraying [20], laser etching [21], electrospinning [22], and recently Zhen Shi et al suggested the technique of hydrocarbon adsorption to create such biomimetic surfaces [23].…”

Section: Introductionmentioning

confidence: 99%

A novel biomimetic nanocomposite exhibiting petal wetting phenomenon: fabrication and experimental investigations

Lenin¹,

Pandurangan²,

Rao³

et al. 2022

Surf. Topogr.: Metrol. Prop.

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A functional composite material that simultaneously exhibits hydrophobicity and water droplet adhesion has monumental potential in controlling fluid flow, studying phase separation, and biological research. This article reports the fabrication of a petal wetting biomimetic Boron Nitride Nanotubes (BNNTs) -Polydimethylsiloxane (PDMS) nanocomposite achieved by drop casting. The petal effect was investigated by non-destructive techniques. The nanotubes were synthesized by chemical vapor deposition at 1150 °C and were characterized by X-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy. The mean diameter of the nanotubes was found to be 70 nm. The nanocomposites had BNNT fillers ranging from 0.5 wt. % to 2 wt. %. Water contact angles for pure PDMS polymer was 94.7° and for the 2 wt. % BNNT-PDMS nanocomposite was 132.4°. The petal wetting nanocomposite displayed a characteristic trait of high contact angle hysteresis. The surface roughness parameters of the nanocomposites were determined by atomic force microscopy. Laser scanning confocal microscopy aided in analyzing the droplet penetration and in observing the trapped air between the water droplet and the nanocomposite surface. Based on surface observations, roughness parameters, and the extent of droplet penetration by the surface, we shed light on the Cassie impregnating wetting regime followed by the biomimetic nanocomposite. Such a surface would be beneficial in the study of the embryogenesis of cells and aid in moisture collection.

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A low-cost filler-dissolved process for fabricating super-hydrophobic poly(dimethylsiloxane) surfaces with either lotus or petal effect

Cited by 8 publications

References 30 publications

An ecological perspective on water shedding from leaves

An ecological perspective on water shedding from leaves

The Influence of Microscale Surface Roughness on Water-Droplet Contact Electrification

A novel biomimetic nanocomposite exhibiting petal wetting phenomenon: fabrication and experimental investigations

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