Magnetically Induced Fog Harvesting via Flexible Conical Arrays

Peng, Yun; He, Yaxu; Yang, Shuai; Ben, Shuang; Cao, Moyuan; Li, Kan; Liu, Kesong; Jiang, Lei

doi:10.1002/adfm.201502745

Cited by 154 publications

(139 citation statements)

References 29 publications

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“…On the one hand, the conical microstructures can be fabricated using facile methods, e.g., by magnetic particle-assisted molding (MPAM). [5,[72][73][74] Using replica molding technique (similar to the fabrication process of the magnetic micropillars shown in Figure 2a), magnetic microneedles with embedded magnetic particles can be obtained. [4,72] Magnetic Microneedles: Figure 4a presents the typical fabrication process of magnetic microneedle surfaces.…”

Section: Surfaces With Magnetic Conical Microstructuresmentioning

confidence: 99%

“…[4,109] Inspired by cactus, Peng et al used an MRS composed of conical-like spines for fog collection. This implied that the basic water requirement for a person could be fulfilled by using a fog collector with a 1 m 2 area for only 1.25 h. [5] Huang et al utilized a surface with magnetically switchable wettability for programmable fog collection and transport (Figure 13c). The collected fog droplets on the spines could be driven to the bottom due to Laplace pressure difference along the conical spines.…”

Section: Fog Harvestingmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12] In the past two decades, an increasing number of passive and active strategies have been developed to control liquid motion. [1][2][3][4][5][6][7][8][9][10][11][12] In the past two decades, an increasing number of passive and active strategies have been developed to control liquid motion.…”

Section: Introductionmentioning

confidence: 99%

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Magnetoresponsive Surfaces for Manipulation of Nonmagnetic Liquids: Design and Applications

Zhou

Huang

Tian

2019

Adv Funct Materials

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Magnetic actuation provides a remote, nondestructive, and real-time way for controllable liquid manipulation, which has promising technological applications for areas ranging from digital microfluidics, biochemical assays, and microreactors, to liquid collection. However, conventional magnetic liquid manipulation usually relies on incorporating magnetic particles into a liquid to empower its motion in response to an external magnetic field, resulting in considerable limitations of magnetic actuation in various applications. Recently, a range of magnetoresponsive surfaces (MRSs) with elaborately designed surface structures and/or compositions have enabled on-demand liquid manipulation using magnetic fields, even when the liquids do not contain any magnetic particles. Here, the state-of-the-art of MRSs capable of manipulation of nonmagnetic liquids is reviewed. Their preparation, different manipulation modes, including directed propulsion, spreading, and rebound, and the underlying working mechanisms are discussed. Based on the working principles, MRSs are classified into three categories, including surfaces with magnetic bendable microstructures, surfaces with switchable topographies, and surfaces infused with ferrofluids. Their applications in microfluidics, microreactors, liquid distributors and pumps, fog collection, and anti-icing are presented. Finally, key challenges and the future prospects of MRSs are provided.

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Section: Surfaces With Magnetic Conical Microstructuresmentioning

confidence: 99%

Section: Fog Harvestingmentioning

confidence: 99%

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Magnetoresponsive Surfaces for Manipulation of Nonmagnetic Liquids: Design and Applications

Zhou

Huang

Tian

2019

Adv Funct Materials

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“…Peng et al achieved magnetoresponsive fast fog harvesting by introducing magnetoresponsive conical arrays on spine structures inspired by cacti. [69] Water fog could be captured in the tip and transported to the spine base by magnetic-field-induced conical spine vibration and . a) Photoinduced droplet motion at the oil/water interface owing to generation of an interfacial-tension gradient under illumination.…”

Section: Magnetoresponsive Solid Substratesmentioning

confidence: 99%

External‐Field‐Induced Gradient Wetting for Controllable Liquid Transport: From Movement on the Surface to Penetration into the Surface

Zhang

et al. 2017

Advanced Materials

101

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External‐field‐responsive liquid transport has received extensive research interest owing to its important applications in microfluidic devices, biological medical, liquid printing, separation, and so forth. To realize different levels of liquid transport on surfaces, the balance of the dynamic competing processes of gradient wetting and dewetting should be controlled to achieve good directionality, confined range, and selectivity of liquid wetting. Here, the recent progress in external‐field‐induced gradient wetting is summarized for controllable liquid transport from movement on the surface to penetration into the surface, particularly for liquid motion on, patterned wetting into, and permeation through films on superwetting surfaces with external field cooperation (e.g., light, electric fields, magnetic fields, temperature, pH, gas, solvent, and their combinations). The selected topics of external‐field‐induced liquid transport on the different levels of surfaces include directional liquid motion on the surface based on the wettability gradient under an external field, partial entry of a liquid into the surface to achieve patterned surface wettability for printing, and liquid‐selective permeation of the film for separation. The future prospects of external‐field‐responsive liquid transport are also discussed.

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“…Mechanic stress and magnetic field: Liu et al developed flexible conical arrays coated with magnetic nanoparticles for fog harvesting systems [108]. Under an external magnetic field, static fog water could be spontaneously and continuously captured and directionally transported from the tip to the base of the spine through periodic vibration of the flexible conical spines driven by the magnetic field and the Laplace pressure difference arising from the conical shape of the flexible spines (Figure 20).…”

Section: Dual Sensitivitymentioning

confidence: 99%

Switchable and Reversible Superhydrophobic Surfaces: Part Two

Taleb¹,

Darmanin²,

Guittard³

2018

Interdisciplinary Expansions in Engineering and Design With the Power of Biomimicry

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In this book chapter, most of the methods used in the literature to prepare switchable and reversible superhydrophobic surfaces are described. Inspired by Nature, it is possible to induce the Cassie-Baxter-Wenzel transition using different external stimuli such as light, temperature, pH, ion exchange, voltage, magnetic field, mechanic stress, plasma, ultrasonication, solvent, gas or guest. Such properties are extremely important for various applications but especially for controllable oil/water separation membranes, oil-absorbing materials, and water harvesting systems.Keywords: superhydrophobic, reversible, switchable, bioinspiration, biomimetism Reversible superhydrophobic surfaces: Part twoThis section provides continuation of the description of the stimuli used in the literature to induce reversible changes in surface wettability. Ion exchangeSince 2004, the researchers have shown that the presence of charged species such as quaternary ammonium groups are sensitive to ion exchange and lead to different surface wettabilities. In 2004, Choi et al. prepared self-assembled monolayers (SAM) with imidazolium groups on smooth Au and Si/SiO 2 substrates [1][2][3]. They studied the effect of a series of anions as shown in Figure 1 and In order to elaborate reversible superhydrophobic properties by ion exchange, gold micro and nanostructured substrates were performed by electroless etching process by immersing silicon substrates in aqueous solution of HAuCl 4 and HF (Figure 2). The surface was then modified by SAM using a thiol terminated by a quaternary ammonium. Then, the surface wettability could be reversely changed from superhydrophilic to superhydrophobic after [20]. Here, the presence of TSPM (sol-gel precursor) was used not only to form a polymer network via intramolecular interactions but also to anchor substrates (Figure 3). The membranes could reversely change from superhydrophobic/highly oleophobic to superhydrophilic/superoleophobic after exchanging Cl − ions by heptadecafluorooctanesulfonic acid (C 8 F 17 SO 3 − or HPS − ) ions. Moreover, the membranes were also highly efficient filter medium for removing multiple contaminants such as SO 2 form waster gas streams. A nother strategy was to deposit polyelectrolyte multilayers poly(diallyldimethylammonium chloride (PDDA) and poly(sodium 4-styrenesulfonate) (PSS) on gold micro and nanostructured substrates [21]. The authors studied the influence of the exchanged ions and the highest properties were obtained by exchanging Cl − (θ w < 5°) ions by PFO − (θ w = 164°). The authors also deposited polyelectrolyte multilayers on micro and nanostructured aluminum substrates obtained by etching in HCl and immersion in boiling water [22,23]. Using PFO − ions, the substrates were superhydrophobic and superoleophobic. When the substrates were immersed in seawater, the PFO − ions were exchanged by hydrophilic Cl − or SO 4 2− making the substrates underwater superoleophobic. Magnetic fieldEnvironment protection against oil leakage during oil tankers sinking is ...

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Magnetically Induced Fog Harvesting via Flexible Conical Arrays

Cited by 154 publications

References 29 publications

Magnetoresponsive Surfaces for Manipulation of Nonmagnetic Liquids: Design and Applications

Magnetoresponsive Surfaces for Manipulation of Nonmagnetic Liquids: Design and Applications

External‐Field‐Induced Gradient Wetting for Controllable Liquid Transport: From Movement on the Surface to Penetration into the Surface

Switchable and Reversible Superhydrophobic Surfaces: Part Two

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