Recent progress in bio-inspired macrostructure array materials with special wettability—from surface engineering to functional applications

Lian, Zhongxu; Zhou, Jianhui; Ren, Wanfei; Chen, Faze; Xu, Jinkai; Tian, Yanling; Yu, Huadong

doi:10.1088/2631-7990/ad0471

Cited by 12 publications

(2 citation statements)

References 288 publications

(381 reference statements)

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“…This innovative design comprises two layers of continuous wedgeangle nested structures, following the concept of 'synergistic biomimetics' (figure 1(a)). Lotus leaf-like superhydrophobic surfaces enable loss-free droplet transport [46,47]. Orchid leaf-like three-dimensional (3D) structures facilitate the selfdriving performance of the transport platform.…”

Section: Resultsmentioning

confidence: 99%

Synergistically biomimetic platform that enables droplets to be self-propelled

Li,

Lu,

Wang

et al. 2024

Int. J. Extrem. Manuf.

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Droplet transport still faces numerous challenges, such as a limited transport distance, large volume loss, and liquid contamination. Inspired by the principle of ‘synergistic biomimetics’, we propose a design for a platform that enables droplets to be self-propelled. The orchid leaf-like three-dimensional driving structure provides driving forces for the liquid droplets, whereas the lotus leaf-like superhydrophobic surface prevents liquid adhesion, and the bamboo-like nodes enable long-distance transport. During droplet transport, no external energy input is required, no fluid adhesion or residue is induced, and no contamination or mass loss of the fluid is caused. We explore the influence of various types and parameters of wedge structures on droplet transportation, the deceleration of droplet speed at nodal points, and the distribution of internal pressure. The results indicate that the transport platform exhibits insensitivity to pH value and temperature. It allows droplets to be transported with varying curvatures in a spatial environment, making it applicable in tasks like target collection, as well as load, fused, anti-gravity, and long-distance transport. The maximum droplet transport speed reached (58 ± 5) mm·s−1, whereas the transport distance extended to (136 ± 4) mm. The developed platform holds significant application prospects in the fields of biomedicine and chemistry, such as high-throughput screening of drugs, genomic bioanalysis, microfluidic chip technology for drug delivery, and analysis of biological samples.

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Section: Resultsmentioning

confidence: 99%

Synergistically biomimetic platform that enables droplets to be self-propelled

Li,

Lu,

Wang

et al. 2024

Int. J. Extrem. Manuf.

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“…It is not only that the graphics are customizable, but also the fine structures can be obtained in the curing transformation of the photopolymerization material . Furthermore, these burgeoning technologies of additive manufacturing − show that it has a potential advantage on bionic structures based on traditional preparation methods. For example, the comparative swimming performance of the bionic shark skin structure was explored with different denticle patterns and spacings via additive manufacturing, which make the contribution to the hydrodynamic function of bionic shark skin .…”

Section: Introductionmentioning

confidence: 99%

Laser Interference Additive Manufacturing: Mask Bundle Shape Bionic Shark Skin Structure

Li,

Wang,

Weng

et al. 2024

ACS Appl. Mater. Interfaces

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Here, we explored a new manufacturing strategy that uses the mask laser interference additive manufacturing (MLIAM) technique, which combines the respective strengths of laser interference lithography and mask lithography to efficiently fabricate across-scales three-dimensional bionic shark skin structures with superhydrophobicity and adhesive reduction. The phenomena and mechanisms of the MLIAM curing process were revealed and analyzed, showing the feasibility and flexibility. In terms of structural performance, the adhesive force on the surface can be tuned based on the growth direction of the bionic shark skin structures, where the maximum rate of the adhesive reduction reaches about 65%. Furthermore, the evolution of the directional diffusion for the water droplet, which is based on the change of the contact angle, was clearly observed, and the mechanism was also discussed by the models. Moreover, no-loss transportations were achieved successfully using the gradient adhesive force and superhydrophobicity on the surface by tuning the growth direction and modifying by fluorinated silane. Finally, this work gives a strategy for fabricating across-scale structures on micro-and nanometers, which have potential application in bioengineering, diversional targeting, and condenser surface.

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Light‐ and Heat‐Responsive Superhydrophobic Surfaces with Shape Memory Capacity Prepared by 4D Printing

Li,

Zhan,

et al. 2024

Adv Eng Mater

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The precise manipulation of microdroplets on solid surfaces is crucial for the practical application and future development of microfluidic control technology. Traditionally, methods to achieve precise control over microdroplets often involve complex fabrication processes. Herein, the control of surface wettability is achieved based on the light‐ and heat‐responsive shape memory effect of the microstructure. An innovative superhydrophobic shape‐memory material with a simplified and efficient manufacturing process is proposed to precisely control microdroplets through surface wettability switching. Firstly, microplates with shape‐memory effects are manufactured using 4D printing technology and polylactic acid as the base material. Then, a mixture of carbon black and epoxy resin is sprayed onto the surface for superhydrophobic modification, resulting in a contact angle of up to 165°. The addition of carbon black endows the surface with excellent photothermal conversion effects. Anisotropy and photothermal response studies are incorporated. Through periodic heating, pressing, and deformation, the microplate array exhibits controllable wettability switching. Based on the shape‐memory effect of polylactic acid, the superhydrophobic surface has adjustable adhesion and is successfully applied to microfluidic platforms and microdroplet size screening. This innovative material and process offer significant potential for advancing the field of microfluidic control technology.

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Recent progress in bio-inspired macrostructure array materials with special wettability—from surface engineering to functional applications

Cited by 12 publications

References 288 publications

Synergistically biomimetic platform that enables droplets to be self-propelled

Synergistically biomimetic platform that enables droplets to be self-propelled

Laser Interference Additive Manufacturing: Mask Bundle Shape Bionic Shark Skin Structure

Light‐ and Heat‐Responsive Superhydrophobic Surfaces with Shape Memory Capacity Prepared by 4D Printing

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