Robust Icephobic Performance of Flexible Needles

Liu, Xuejuan; Zhao, Hongbin; Li, Peiliu; Pang, Yan; Fan, Yuzun; Zhang, Bo; Wang, Lei; Zheng, Yongmei; Wang, Zuankai

doi:10.1002/cnma.201800422

Cited by 9 publications

(11 citation statements)

References 33 publications

(47 reference statements)

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“…In the previous research, we have found the flexible base is useful for enhancing the stability of nano‐structure on the surface. [ 37 ] It showed the energy generated by the impacting droplet or volume expansion of ice in the icing progress could be effectively transferred to the flexible base, resulting in enhancing the stability and duration of nano‐materials. However, by reducing the materials’ stiffness to improve its flexibility is easy to cause the loss of surfaces’ function, because the surface has a low load limit and a larger strain.…”

Section: Resultsmentioning

confidence: 99%

Design of flexible multi‐level topography for enhancing mechanical property

Wang

Zhao³

et al. 2020

Nano Select

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Robust mechanical property is fundamentally significant for applications of nano‐materials, such as micro‐fluidic, sensor, superhydrophobic/ icephobic, and crush‐resistant functions. However, the nano‐materials used in the applications are always easily ruined due to the poor adhesion and weak mechanical properties. To enhance the nano‐materials’ duration in hash environment, a strategy of robust nano‐topography protection is studied in this paper. In our experiment, a series of multi‐level sub‐mm topography with nano‐materials are fabricated by integrating the methods of soft lithography, and crystal growth. The mechanical properties of nano‐materials are quantitatively studied, and the nano‐material can be protected by the designed flexible multi‐level topography, which significantly decreases the strain and stress of the nano‐structure. To investigate the mechanism of this performance, a series of simulations are performed, and a mechanical model is established to explain this phenomenon. This work uncovers the multi‐level principles for nano‐materials protection and gives a guideline to design the nano‐materials’ surfaces.

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Section: Resultsmentioning

confidence: 99%

Design of flexible multi‐level topography for enhancing mechanical property

Wang

Zhao³

et al. 2020

Nano Select

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“…Previous researches have confirmed that the rough topographies could provide much pocketed air between the solid‐liquid interface, which declines the contact area and leads the droplet roll off with small tilted angle . The flexible body is also a significant role for enhancing the durability of surface topographies . When the surface under loading, the external energy is mainly transferred into the elastic energy of the body, which decreases the overloading on the weak nano‐topography of the surface.…”

Section: Figurementioning

confidence: 99%

“…[31][32] The flexible body is also a significant role for enhancing the durability of surface topographies. [33] When the surface under loading, the external energy is mainly transferred into the elastic energy of the body, which decreases the overloading on the weak nano-topography of the surface. The MHCs in LD's wing play two significant roles, one is to keep the wing high-strength and lightweight, the other one is to transfer the stress from the surface into the interlayer of the wing.…”

mentioning

confidence: 99%

An Interlayer of Multiple Microscale Hollow Channels Enhances the Durability of Surface Topographies

Ding

Yang²,

et al. 2020

ChemNanoMat

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Self‐cleaning plays a significant role for natural beings, as it keeps surfaces dry and clean, which is beneficial for lowering the body's weight, absorbing more light, and preventing rotting. Various topographies have been created by nature to achieve these goals. The stability of surface topography is the most essential element for maintaining these functions. Here, we report a new method for lowering the elastic modulus and enhancing the durability of surface topography. In this study, we find that multi micro hollow channels interlayer of Lycorma Delicatula's wing could effectively transfer the stress from the upper surface to the interlayer and decrease the stress concentration on the surface nano‐topography, which enhances the durability of its surface functions. The simulation and artificial surface illustrate that this new design method provides a new way to decrease the elastic modulus and enhance topographic stability.

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“…Based on these discoveries, other functional surfaces, including magnetic field-driven ferrofluids and oil-infused polymeric materials, have also been investigated (19)(20)(21). However, a robust surface design that is able to show a long-term resistance to ice accretion, especially when harsh operating conditions such as high humidity and mechanical wearing are present, still remains a challenge (22)(23)(24)(25).…”

mentioning

confidence: 99%

Frost-free zone on macrotextured surfaces

Yao

Zhao

Machado

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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Numerous studies have focused on designing functional surfaces that delay frost formation or reduce ice adhesion. However, solutions to the scientific challenges of developing antiicing surfaces remain elusive because of degradation such as mechanical wearing. Inspired by the discontinuous frost pattern on natural leaves, here we report findings on the condensation frosting process on surfaces with serrated structures on the millimeter scale, which is distinct from that on a conventional planar surface with microscale/nanoscale textures. Dropwise condensation, during the first stage of frosting, is enhanced on the peaks and suppressed in the valleys, causing frost to initiate from the peaks, regardless of surface chemistry. The condensed droplets in the valley are then evaporated due to the lower vapor pressure of ice compared with water, resulting in a frost-free zone in the valley, which resists frost propagation even on superhydrophilic surfaces. The dependence of the frost-free areal fraction on the geometric parameters and the ambient conditions is elucidated by both numerical simulations based on steady-state diffusion and an analytical method with an understanding of boundary conditions independent of surface chemistry. We envision that this study would provide a unified framework to design surfaces that can spatially control frost formation, crystal growth, diffusion-controlled growth of biominerals, and material deposition over a broad range of applications.

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Robust Icephobic Performance of Flexible Needles

Cited by 9 publications

References 33 publications

Design of flexible multi‐level topography for enhancing mechanical property

Design of flexible multi‐level topography for enhancing mechanical property

An Interlayer of Multiple Microscale Hollow Channels Enhances the Durability of Surface Topographies

Frost-free zone on macrotextured surfaces

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