Molecular Dynamics Simulation on the Wettability of Nanoscale Wrinkles: High Water Adhesion of Rose Petals

Shao, Jinwei; Huang, Yinguo; Zhao, Meirong; Yang, Yong; Zheng, Yelong; Zhu, Rui

doi:10.1021/acs.langmuir.2c00974

Cited by 4 publications

(5 citation statements)

References 58 publications

(80 reference statements)

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“…This same rationale also applies for the negative replicas, which have the same degree of homogenization as that of the positive replicas themselves and thus explains the higher h c for YRN than on RRN. So, in previous studies, the influence of the complex hierarchical structures that are omnipresent on these biological surfaces over the static wetting states have been studied, 13,14,32 but the dynamic wetting states over such short times have been missing. This is shown here for the first time that over a much shorter time such as during droplet impact, the same hierarchical structures that show sticky superhydrophobicity reveal a myriad of other wetting states including the completely opposite superhydrophobicity as well.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…A more recent study revealed that this petal effect may also find its origin in the chemical heterogeneity at the nanoscale . Another molecular dynamics simulation study showed that the higher wettability of the nanowrinkles is the reason for such high adhesion . However, it is envisaged that such a surface can be employed to hold a drop of liquid against gravity and to suppress any spill to the neighboring areas after depositing a droplet, ,,,, including possible fabrication of stable slippery surfaces by anchoring the slip enhancing the oil layer against the gravity-mediated drainage and also for maneuvering droplets over them .…”

Section: Introductionmentioning

confidence: 99%

“…13 Another molecular dynamics simulation study showed that the higher wettability of the nanowrinkles is the reason for such high adhesion. 14 However, it is envisaged that such a surface can be employed to hold a drop of liquid against gravity and to suppress any spill to the neighboring areas after depositing a droplet, 9,10,12,15,16 including possible fabrication of stable slippery surfaces by anchoring the slip enhancing the oil layer against the gravity-mediated drainage 17 and also for maneuvering droplets over them. 18 Interestingly, almost all the published articles on wetting of rose petals generally focus on the wetting state after the droplet has reached its equilibrium state, except a recent study by Basu et al that has addressed the wettability over a short time on such surfaces.…”

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Droplet Impact Dynamics on Biomimetic Replica of Yellow Rose Petals: Rebound to Micropinning Transition

et al. 2023

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Rose petals exhibit a phenomenal wetting property of being sticky and superhydrophobic simultaneously. A recent study has shown that for short timescales, associated with drop impact phenomenon, lotus leaf and rose petal replicas exhibit similar wettability, thereby highlighting the difference between long and short time wettability. Also, short time wetting on rose petals of different colors remains completely unaddressed, as almost all existing study on wetting of rose petals have been performed with the classical red rose (Rosa chinensis). In this paper, we compare the drop impact studies on replicas of a yellow rose petal, with those on extensively studied red rose petal replicas and the lotus leaf over a wide range of Weber number (We), by varying the height of fall (h) from 10 to 375 mm. Our results reveal that over the replica of a yellow rose petal, the initial impact outcome varies from complete rebound to micro pinning and eventually complete pinning depending on the kinetic energy of the impacting drop, in contrast to that on red rose petal replica on which the droplet always pinned. Based on experimental finding, we present a comprehensive regime phase map of the post impact behavior of the drop on different surfaces as a function of impact height. We also present a simple scaling analysis to understand the combined effect of pattern height and periodicity on the critical h corresponding to wetting regime transition. Additionally, variation of maximum spreading diameter and spreading time with the h for the different surfaces is also discussed. The results highlight that the initial impact dynamics of a water drop over a topographically patterned substrate is a strong function of the topographical parameters and can be very different from the equilibrium wetting state.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Droplet Impact Dynamics on Biomimetic Replica of Yellow Rose Petals: Rebound to Micropinning Transition

et al. 2023

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“…However, the experimental studies demonstrate that the hydrophobicity of EP surfaces presents nonlinearities as a function of polar composition, where the increased hydrophilic polar groups do not boost the hydrophilicity on the solid surface. Molecular dynamics calculation has been proven an effective method as a supplement to study the surface wetting properties. − Here, to reveal the underlying mechanism on the wetting property, the interaction between water and EP molecules before and after ozone treatment is studied by molecular simulation using Material Studio.…”

Section: Resultsmentioning

confidence: 99%

Surprising Hydrophobic Polymer Surface with a High Content of Hydrophilic Polar Groups

Niu

Shang

et al. 2022

Langmuir

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The wetting property of a solid surface has been a hotspot for centuries, and many studies suggest that the hydrophobicity is highly related to the polar components. However, the underlying mechanism of polar moieties on the hydrophobicity remains unclear. Here, we tailor the surface polar moieties of epoxy resin (EP) by ozone modification and assess their wetting properties. Our results show that, for the modified EP with more (60.54%) polar moieties, the polar effect on hydrophobicity cannot be empirically observed. To reveal the underlying mechanism, the absorption parameters, including equilibrium distance, adsorption radius, and effective adsorption sites for water on EP before and after ozone treatment, are calculated on the basis of molecular simulations. After ozone modification, the equilibrium distance (from 1.95 to 1.70 Å), adsorption radius (from 3.80 to 4.50 Å), and effective adsorption sites (from 1 to 2) change slightly and the EP surface remains hydrophobic, although the polar groups significantly increase. Therefore, it is concluded that the wetting properties of solid surfaces are dominated by the equilibrium distance, adsorption radius, and effective adsorption sites for water on solids, and the nonlinear relationship between polar groups and hydrophilicity is clarified.

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“…In addition, we found that the mechanical properties of biological tissues are complex, especially the weak adhesion force on the surface of tissues, which is difficult to measure. In the following work, we will continue to further miniaturization design, and consider adding nanoscale structures 36 or charge modification 37 on the surface of optical waveguide to achieve higher adhesion sensitivity. We anticipate that the system can assist with minimally invasive surgery and provide adhesion information on the surface of organs in the future.…”

Section: ■ Conclusionmentioning

confidence: 99%

Vision-Based Contact Adhesion Measurement Method on Soft Matter Surfaces

Zhu

et al. 2023

Langmuir

Self Cite

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Adhesion property measurements contribute to a comprehensive understanding of the mechanical properties of soft matters. Indentation tests are a common method for measuring the adhesion force. However, indenters generally have a large volume and a small sensing angle and, thus, are not conducive to local detection in high-precision environments. Here, we propose a vision-based contact adhesion measurement (VisCAM) method to achieve the contact image and adhesion force on soft matter surfaces from the perspective of indentation direction. The coupling of the 7.6 mm diameter probe and a flexible fiber makes the system similar to a miniaturized endoscope. Classical contact theories and finite element models are used for the contact mechanics analysis of silicone rubber. The image grayscale–load mathematical model is constructed based on the change in contact light spot. Finally, the uncertainty of the system is less than 4%, and the measurement error is 0.04 N. In-vitro kidney indentation experiments showed that the local adhesion force measurement of soft tissues can be completed. Our method provides better solutions for understanding the adhesion properties of soft matters.

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Molecular Dynamics Simulation on the Wettability of Nanoscale Wrinkles: High Water Adhesion of Rose Petals

Cited by 4 publications

References 58 publications

Droplet Impact Dynamics on Biomimetic Replica of Yellow Rose Petals: Rebound to Micropinning Transition

Droplet Impact Dynamics on Biomimetic Replica of Yellow Rose Petals: Rebound to Micropinning Transition

Surprising Hydrophobic Polymer Surface with a High Content of Hydrophilic Polar Groups

Vision-Based Contact Adhesion Measurement Method on Soft Matter Surfaces

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