Magnetically driven superhydrophobic meshes with the capacity of moving at air/water and oil/water interfaces

Zhang, Jihua; Feng, Huadong; Zao, Weitao; Zhao, Yunfeng; Zhang, Hui; Liu, Yibin

doi:10.1039/c5ra05921f

Cited by 8 publications

(7 citation statements)

References 47 publications

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“…Reproduced from ref. [124] Copyright (2015), with permission from RSC Publishing. (b) 1: Oil droplet manipulation under water.…”

Section: Magnetic Induction Typementioning

confidence: 99%

Advances in the Research of Photo, Electrical, and Magnetic Responsive Smart Superhydrophobic Materials: Synthesis and Potential Applications

Wang,

Qu,

Ren

et al. 2023

Chemistry An Asian Journal

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With the rapid advancement of technology, the wettability of conventional superhydrophobic materials no longer suffice to meet the demands of practical applications. Intelligent responsive superhydrophobic materials have emerged as a highly sought‐after material in various fields. The exceptional superhydrophobicity, reversible wetting, and intelligently controllable characteristics of these materials have led to extensive applications across industries, including industry, agriculture, defense, and medicine. Therefore, the development of intelligent superhydrophobic materials with superior performance, economic practicality, enhanced sensitivity, and controllability assumes utmost importance in advancing technology worldwide. This article provides a summary of the wettability principles of superhydrophobic surfaces and the mechanisms behind intelligent responsive superhydrophobicity. Furthermore, it reviews and analyzes the recent research progress on light, electric, and magnetic responsive superhydrophobic materials, encompassing aspects such as material synthesis, modification, performance, and responses under diverse external stimuli. The article also explores the challenges associated with different types of responsive superhydrophobic materials and the unique application prospects of light, electric, and magnetic responsive superhydrophobic materials. Additionally, it outlines the future directions for the development of intelligent responsive superhydrophobic materials.

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“…Reproduced from ref. [124] Copyright (2015), with permission from RSC Publishing. (b) 1: Oil droplet manipulation under water.…”

Section: Magnetic Induction Typementioning

confidence: 99%

Advances in the Research of Photo, Electrical, and Magnetic Responsive Smart Superhydrophobic Materials: Synthesis and Potential Applications

Wang,

Qu,

Ren

et al. 2023

Chemistry An Asian Journal

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“…[ 20 ] Later, superoleophobic materials were used in order to extend the water–air interface to locomotion at water–oil interfaces. [ 21,22 ] Furthermore, materials with the ability to repel different families of fluids, namely superomniphobic materials, can potentially be used for small robots performing locomotion at interfaces between water, oil and solvents. [ 23,24 ] Especially interesting is the ability to reversibly toggle between different interfaces, independently or in response to external triggers.…”

Section: Water–air Interfacementioning

confidence: 99%

How Can Interfacial Phenomena in Nature Inspire Smaller Robots

Das

Pinchasik

2020

Adv Materials Inter

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In nature, surfaces are evolutionarily designed to allow adaptation of species to their environments. Insects make extensive use of interfacial phenomena because of their small size and thus, large surface‐area‐to‐volume ratio. This enables them to walk on different terrains, dive, swim, and adhere to surfaces in air and underwater. Moreover, they toggle between different interfaces, move in confined spaces, and overcome a wide range of obstacles. This progress report summarizes emerging directions in the field of bioinspired robotics with an emphasis on micro and nanoscale dynamic interactions. It is envisioned that interfacial phenomena will allow to miniaturize robots and increase the complexity of their operation. The key to success is the combination of functional surfaces, structural design and multiple modes of locomotion. For this to be realized, however, new paradigms are needed in terms of materials, fabrication, energy consumption, and actuation. This report discusses the development of small robots inspired by water striders, the bell spider, the leaf and ladybird beetles, backswimmers and cockroaches, among many others. It also discusses small soft robots inspired by roundworms, larvae, and parasites. From a broader perspective, fabrication of many small robots will enable to study collective effects and self‐assembly, group behavior and swarming.

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“…The vast majority of the methods for active droplet mobility manipulation entails the use of electrical, magnetic, thermal, vibrational, − mechanical, or optical stimuli and necessitates the fabrication of microelectrodes, specific stacking layer sequences, or surface texturing, requires structures with flexural elasticity, induces heat dissipation, or introduces foreign particles into the liquid phase, which may provide drawbacks for specific applications.…”

Section: Introductionmentioning

confidence: 99%

Droplet Mobility Manipulation on Porous Media Using Backpressure

Vourdas¹,

Pashos

Kokkoris

et al. 2016

Langmuir

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Wetting phenomena on hydrophobic surfaces are strongly related to the volume and pressure of gas pockets residing at the solid-liquid interface. In this study, we explore the underlying mechanisms of droplet actuation and mobility manipulation when backpressure is applied through a porous medium under a sessile pinned droplet. Reversible transitions between the initially sticky state and the slippery states are thus incited by modulating the backpressure. The sliding angles of deionized (DI) water and ethanol in DI water droplets of various volumes are presented to quantify the effect of the backpressure on the droplet mobility. For a 50 μL water droplet, the sliding angle decreases from 45 to 0° when the backpressure increases to ca. 0.60 bar. Significantly smaller backpressure levels are required for lower surface energy liquids. We shed light on the droplet actuation and movement mechanisms by means of simulations encompassing the momentum conservation and the continuity equations along with the Cahn-Hilliard phase-field equations in a 2D computational domain. The droplet actuation mechanism entails depinning of the receding contact line and movement by means of forward wave propagation reaching the front of the droplet. Eventually, the droplet skips forward. The contact line depinning is also corroborated by analytical calculations based on the governing vertical force balance, properly modified to incorporate the effect of the backpressure.

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Magnetically driven superhydrophobic meshes with the capacity of moving at air/water and oil/water interfaces

Abstract: Under a magnetic field, the micro-robot could move directionally at air/water and oil/water interfaces in a closed system.

Cited by 8 publications

References 47 publications

Advances in the Research of Photo, Electrical, and Magnetic Responsive Smart Superhydrophobic Materials: Synthesis and Potential Applications

Advances in the Research of Photo, Electrical, and Magnetic Responsive Smart Superhydrophobic Materials: Synthesis and Potential Applications

How Can Interfacial Phenomena in Nature Inspire Smaller Robots

Droplet Mobility Manipulation on Porous Media Using Backpressure

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