Magnetically Controllable Isotropic/Anisotropic Slippery Surface for Flexible Droplet Manipulation

Yao, Fang; Liang, Jie; Bai, Xue; Yong, Jiale; Huo, Jinglan; Yang, Qing; Hou, Xun

doi:10.1021/acs.langmuir.0c03008

Cited by 25 publications

(28 citation statements)

References 33 publications

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“…In the contrast, pitcher plants use the microtextures to trap an intermediary liquid as a repellent surface (Figure 1b,c). [35,36] Such surfaces exhibit stability and fog repellence. To integrate the advantages of natural compound eyes with large FOV and the wetting and anti-fogging characteristics of the pitcher plant, we fabricated artificial compound eyes that possess an exquisite 3D morphology and ultrafine ommatidium.…”

Section: Design and Fabrication Of Mf-acesmentioning

confidence: 99%

Bioinspired Anti‐Fogging and Anti‐Fouling Artificial Compound Eyes

Yang

et al. 2022

Advanced Optical Materials

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compound eyes with distinguished advantages, such as large field of view (FOV), low aberration, high sensitivity to moving objects, and high temporal resolution. [2] Moreover, the periodically arranged nanoripples make the eyes have superhydrophobicity and anti-fogging property. [3,4] Motivated by these unique features, bionics on the geometrics and optical performance of natural compound eyes have been investigated and have shown great potential in medical endoscopic imaging, digital cameras, and wide-field imaging. [5][6][7][8][9][10] In recent years, various methods have been proposed to fabricate artificial compound eyes (ACEs), such as self-assembly method, inkjet printing and air-assisted deformation, single-pulse femtosecond laser wet etching with thermal embossing, and so on. [11][12][13][14][15] However, in highly humid or low-temperature environments, fog easily forms on the surface of these ACE elements and thus scatters light by the condensed water droplets. Up to now, very few researchers have achieved antifogging surfaces that could be used for optical imaging purposes. Generally speaking, they are working through the following two aspects. The first one is superhydrophobic-induced surfaces that prevent fog from adhering to the micro-lens surface. [16] Another one is superhydrophilic-induced surfaces that can suppress fogging behavior by the rapid spread of condensing water droplets. [17] The disadvantages of these methods are obvious. Superhydrophobic surfaces always require hexagonal nipples or close-packed protuberances of nanoscale on the surface of microstructures, which brings a great challenge to current micro/nano manufacturing processes, and is not conducive to mass production. Furthermore, these superwetting surfaces are unstable when suffering from high pressure, long-term working, or abrasion, which results in the loss of anti-fogging ability. Therefore, it still remains a challenge to develop a more facile process to fabricate bioinspired artificial compound eyes that reproduces the functionality of the natural compound eyes.It is interesting that Nepenthes pitcher plants can prevent insects to stand on their pitcher and, instead make them slide down from the rim to the bottom. [18] This excellent characteristic benefits from a layer of lubricating fluid stored in Curved artificial compound eyes (ACEs) attract enormous research interest owing to their potential applications in medical devices, surveillance imaging, target tracking, and so on. However, fog, dust, or other liquids are likely to condense on the device surface under a humid, low-temperature environment or outdoors, thus affecting the optical performance. In this work, a multifunctional ACE (MF-ACE) is fabricated by a combination of i) femtosecond laser wet etching, ii) soft lithography, and iii) polydimethylsiloxane (PDMS) swelling methods. The fabricated device is close-packed with over 3000 microlenses (≈108 µm diameter and ≈15 µm height) on a spherical macrolens (6.56 cm diameter and 0.87 cm height). The trapped silicone...

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Section: Design and Fabrication Of Mf-acesmentioning

confidence: 99%

Bioinspired Anti‐Fogging and Anti‐Fouling Artificial Compound Eyes

Yang

et al. 2022

Advanced Optical Materials

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“…Fang et al prepared a magnetically controllable SLIPS on an epoxy polymer substrate [130]. The whole surface of the substrate was ablated by the femtosecond laser to form a rough surface microstructure.…”

Section: Slips Based On the Laser-inducedmentioning

confidence: 99%

“…The liquid adhesion on SLIPS is very low, so it is easy to control the movement of droplets on the slippery surface. Fang et al mixed the magnetic particles into water droplets [130]. By controlling the magnetic field, the magnetic droplet can be directed to move forward along the designed path (Figure 31(a)).…”

Section: Metalsmentioning

confidence: 99%

Nature-Inspired Superwettability Achieved by Femtosecond Lasers

et al. 2022

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Wettability is one of a solid surface’s fundamental physical and chemical properties, which involves a wide range of applications. Femtosecond laser microfabrication has many advantages compared to traditional laser processing. This technology has been successfully applied to control the wettability of material surfaces. This review systematically summarizes the recent progress of femtosecond laser microfabrication in the preparation of various superwetting surfaces. Inspired by nature, the superwettabilities such as superhydrophilicity, superhydrophobicity, superamphiphobicity, underwater superoleophobicity, underwater superaerophobicity, underwater superaerophilicity, slippery liquid-infused porous surface, underwater superpolymphobicity, and supermetalphobicity are obtained on different substrates by the combination of the femtosecond laser-induced micro/nanostructures and appropriate chemical composition. From the perspective of biomimetic preparation, we mainly focus the methods for constructing various kinds of superwetting surfaces by femtosecond laser and the relationship between different laser-induced superwettabilities. The special wettability of solid materials makes the femtosecond laser-functionalized surfaces have many practical applications. Finally, the significant challenges and prospects of this field (femtosecond laser-induced superwettability) are discussed.

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“…The functional surfaces with elaborately arranged micro/nanostructures can achieve the precise control of liquid and then realize the fine transfer, [1,2] separation, [3] mixture, [4] or transport [5,6] of tiny substance. [7][8][9] A variety of artificial surfaces with various wettability inspired by natural creatures have been developed [10][11][12] and successfully applied in the fields of medical testing, [13] anti/collect-fog, [14] self-cleaning [15] and chip heat dissipation.…”

Section: Introductionmentioning

confidence: 99%

Wettability and Droplet Directional Spread Investigation of Crescent Array Surface Inspired by Slippery Zone of Nepenthes

Jing

Sun

et al. 2021

Adv Materials Inter

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In this report, the surface topography of crescent array in the Nepenthes slippery zone is measured and bionic fabricated by two‐photon polymerization (TPP) technology. A subregion outside‐in scanning method (SOSM) is proposed to solve the photoresist converge and large area surface positioning problem existing in bionic crescent array surface (BCAS) fabrication. The geometric parameters of BCAS, including area fraction, height, offset, and outer–inner radius ratio, are systematically investigated to reveal their effects on the hydrophobic performance. Perfluorinated polyether oil and fluorocarbon solvent were used to increase the hydrophobicity and homogeneity of bionic surface. The contact angles of BCASs coated with and without the solution are measured. The maximum contact angle can reach to 152.1°. What's more, considering the anisotropy of BCAS, anisotropic wetting research is conducted. Offset and outer–inner radius ratio are found to have obvious effects on the contact angle differences between convexity and concavity directions. The maximum contact angle difference can reach to 5.1°. Spreading and pinning phenomenon caused by droplet anisotropic wetting are observed and explained. This work is expected to provide references for the BCAS to be applied in super‐hydrophobic and droplets motion fields.

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Magnetically Controllable Isotropic/Anisotropic Slippery Surface for Flexible Droplet Manipulation

Cited by 25 publications

References 33 publications

Bioinspired Anti‐Fogging and Anti‐Fouling Artificial Compound Eyes

Bioinspired Anti‐Fogging and Anti‐Fouling Artificial Compound Eyes

Nature-Inspired Superwettability Achieved by Femtosecond Lasers

Wettability and Droplet Directional Spread Investigation of Crescent Array Surface Inspired by Slippery Zone of Nepenthes

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