Hierarchical hydrophobic surfaces with controlled dual transition between rose petal effect and lotus effect via structure tailoring or chemical modification

Wang, Chunnan; Shao, Ruomei; Wang, Guiqiang; Sun, Shuqing

doi:10.1016/j.colsurfa.2021.126661

Cited by 21 publications

(18 citation statements)

References 48 publications

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“…T fr (2) where ρ is the droplet fluid density, a ̅ is the gravitational acceleration vector, p is the gauge pressure, γ is the surface tension…”

Section: ■ Numerical Modelingmentioning

confidence: 99%

“…The decorating surfaces with micro/ nanopillars toward generating the Lotus effect can increase the droplet mobility and reduce droplet adhesion on hydrophobic surfaces. 2 Several methods are adopted decorating surfaces for hydrophobic wetting states; 3 however, a one-step method with the non-hazardous process is favorable. 4 Hierarchical distribution of texture topology plays one of the major roles in minimizing droplet pinning.…”

Section: ■ Introductionmentioning

confidence: 99%

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Droplet Rolling Dynamics over a Hydrophobic Surface with a Minute Width Channel

et al. 2021

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Unidirectional and stabilize droplet rolling over hydrophobic surfaces is critical for self-cleaning applications of large areas. Introducing minute size channels on hydrophobic surfaces in the droplet rolling direction can minimize droplet wobbling and enables unidirectional rolling. The droplet rolling behavior over an inclined hydrophobic surface having a minute size channel is investigated. The flow field developed inside the droplet fluid is numerically simulated in a three-dimensional domain pertinent to experimental conditions. Experiments are carried out using a high-speed facility to monitor and evaluate droplet motion over channeled and flat hydrophobic surfaces. The findings revealed that predictions of the droplet translational velocity and those obtained from the experiments are in good agreement. The presence of a minute channel on the hydrophobic surface gives rise to droplet fluid inflection into the minute channel, which in turn modifies the center of mass of the droplet during rolling. This lowers the droplet wobbling height and enables the droplet to roll unidirectionally along the channel length. Enlarging the channel width on the hydrophobic surface increases droplet kinetic energy dissipation while reducing the droplet rolling speed. The complex flow structures formed in the droplet fluid modifies the pressure along the droplet centerline; however, the droplet fluid pressure remains almost the same order as the Laplace pressure in the upper region of a rolling droplet over the channeled hydrophobic surface.

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“…T fr (2) where ρ is the droplet fluid density, a ̅ is the gravitational acceleration vector, p is the gauge pressure, γ is the surface tension…”

Section: ■ Numerical Modelingmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Droplet Rolling Dynamics over a Hydrophobic Surface with a Minute Width Channel

et al. 2021

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“…The subsurface layer shows nano sticks with diameters around 50 nm randomly distributed [ 95 ]. The most relevant characteristics are its high hydrophobicity ( Figure 4 ) and self-cleaning (“lotus leaf effect”, Figure 5 a) abilities, in which water droplets roll off easily from the surface [ 96 , 97 ]. These properties have been associated with many effects, including antibacterial.…”

Section: Bioinspiration From Vegetal Surfacesmentioning

confidence: 99%

“…Rose petals have hierarchical structures with micro-papillae of around 20 µm in diameter and nanometric cuticular folds of around 730 nm in width [ 98 , 99 ]. Such hierarchical surface is responsible for the “rose petal effect”, in which water droplets are highly adhered to the superhydrophobic surface of the petal ( Figure 5 b) [ 96 , 97 ]. Chemical analysis from Rosa rugosa show that the petals are composed by phenolic acids, tannins, flavonoids, carotenoids and polysaccharides [ 99 ].…”

Section: Bioinspiration From Vegetal Surfacesmentioning

confidence: 99%

Bioinspired Topographic Surface Modification of Biomaterials

Arango-Santander

2022

Materials

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Physical surface modification is an approach that has been investigated over the last decade to reduce bacterial adhesion and improve cell attachment to biomaterials. Many techniques have been reported to modify surfaces, including the use of natural sources as inspiration to fabricate topographies on artificial surfaces. Biomimetics is a tool to take advantage of nature to solve human problems. Physical surface modification using animal and vegetal topographies as inspiration to reduce bacterial adhesion and improve cell attachment has been investigated in the last years, and the results have been very promising. However, just a few animal and plant surfaces have been used to modify the surface of biomaterials with these objectives, and only a small number of bacterial species and cell types have been tested. The purpose of this review is to present the most current results on topographic surface modification using animal and plant surfaces as inspiration to modify the surface of biomedical materials with the objective of reducing bacterial adhesion and improving cell behavior.

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“…This field of study is focused on observing the mechanisms and structures existing in nature and implementing them into the technological inventions. Learning from sophisticated systems, morphologies and functions provide a wide range of ideas and concepts that are already copied by scientists and engineers from different fields of knowledge [8,9]. However, implementation of biological aspects is a very complex process that can be divided into three main steps: understanding the principles of the copying mechanism, implementation in the laboratory scale and the translation for selected application [10].…”

Section: Introductionmentioning

confidence: 99%

Preliminary Research: Validation of the Method of Evaluating Resistance to Surface Wetting with Liquid of Protective Materials Intended for Polymer Protective Gloves

Irzmańska

Jastrzębska

Makowicz

2021

IJERPH

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The article presents validation argumentation of the novel method of evaluating resistance to surface wetting with different liquids of protective materials intended for polymer protective gloves based on the three parameters: water permeability index, non-wettability index and absorption index. Using our own method of evaluating resistance to surface wetting, it was shown that the knurled structure of the palm part of polymer protective gloves may inhibit transport of harmful and hazardous liquids outside the area of the protective glove. Currently, there is lack of objectifying methods for evaluation of surface wettability focused on the mentioned aspects. In view of the above facts, an original method for evaluating the resistance of protective materials to surface wetting with mineral oils and water has been invented and validated. It was assumed that the non-wettability index will be subjected to metrological analysis. Consequently, the validation process refers to this index. A precise assessment of the uncertainty budget of the individual components was obtained. On the basis of the obtained results, the measurement errors that may affect the quality and reliability of the test result performed in the laboratory were identified.

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Hierarchical hydrophobic surfaces with controlled dual transition between rose petal effect and lotus effect via structure tailoring or chemical modification

Cited by 21 publications

References 48 publications

Droplet Rolling Dynamics over a Hydrophobic Surface with a Minute Width Channel

Droplet Rolling Dynamics over a Hydrophobic Surface with a Minute Width Channel

Bioinspired Topographic Surface Modification of Biomaterials

Preliminary Research: Validation of the Method of Evaluating Resistance to Surface Wetting with Liquid of Protective Materials Intended for Polymer Protective Gloves

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