Magnetic field assisted droplet manipulation on a soot-wax coated superhydrophobic surface of a PDMS-iron particle composite substrate

Damodara, Sreekant; Sen, A. K.

doi:10.1016/j.snb.2016.08.086

Cited by 32 publications

(21 citation statements)

References 21 publications

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“…Thus, the droplet was able to follow the motion of the magnet. [83] Upon applying a magnetic field, the droplet tended to slide away from the ridge, and a transporting velocity in the range of 1-20 mm s −1 was obtained in their work. [55] This platform allowed magnetic manipulation of various kinds of droplets, including caustic acid/base, organic solvents, and high-viscosity fluids.…”

Section: Magnetic Surfaces With Switchable Local Topology (Dent or Rimentioning

confidence: 90%

“…Another similar design was provided by Damodara and Sen, who used a cone-shape magnet to trigger upward deformation of the MR elastomer surface which was covered with a superhydrophobic soot-wax coating, as shown in Figure 9b. [83] Upon applying a magnetic field, the droplet tended to slide away from the ridge, and a transporting velocity in the range of 1-20 mm s −1 was obtained in their work.…”

Section: Magnetic Surfaces With Switchable Local Topology (Dent or Rimentioning

confidence: 90%

“…Fast transporting (≈8 cm s −1 ), mixing, and merging of water droplets [54,83] Combining a magnet-controlled deformable substrate and a slippery liquid-infused surface d)…”

Section: Droplet-based Microfluidics and Microreactorsmentioning

confidence: 99%

“…[65][66][67] Several groups have developed MRSs with switchable roughness for liquid motion control. [51,54,[81][82][83][84] Magnetorheological (MR) Elastomers: An MR elastomer refers to the composite containing an elastomer matrix and magnetic particles. [85,86] As reported by Lee et al, when an MR elastomer film was subjected to a magnetic field, its surface roughness changed accordingly.…”

Section: Magnetic Surfaces With Switchable Roughnessmentioning

confidence: 99%

See 3 more Smart Citations

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: Magnetic Surfaces With Switchable Local Topology (Dent or Rimentioning

confidence: 90%

Section: Magnetic Surfaces With Switchable Local Topology (Dent or Rimentioning

confidence: 90%

“…Fast transporting (≈8 cm s −1 ), mixing, and merging of water droplets [54,83] Combining a magnet-controlled deformable substrate and a slippery liquid-infused surface d)…”

Section: Droplet-based Microfluidics and Microreactorsmentioning

confidence: 99%

Section: Magnetic Surfaces With Switchable Roughnessmentioning

confidence: 99%

See 2 more Smart Citations

Magnetoresponsive Surfaces for Manipulation of Nonmagnetic Liquids: Design and Applications

Zhou

Huang

Tian

2019

Adv Funct Materials

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“…The surface deformation could be controlled by a magnetic field driving the iron microparticles embedded in poly(dimethylsiloxane) (PDMS). [72] Hydrophobic magnetic particles can also be introduced onto the liquid droplet surface (i.e., magnetoresponsive LMs) to manipulate the inner liquid for controllable transport. [73][74][75][76] …”

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

104

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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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Directional Droplet Transport on Functional Surfaces with Superwettabilities

Zhang

Han

et al. 2021

Adv Materials Inter

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Directional droplet transport on smart surfaces with superwettabilities arouse extensive attentions from both the scientific community and industry due to the exciting applications in healthcare, environmental protection, and energy harvesting. The past decades have witnessed the progress and achievements in mechanism disclosure, device preparation, and applied investigation. Herein, various droplet transport schemes are summarized, such as electrohydrodynamic strategy, self‐propelled droplet on anisotropic surfaces, gravity driven droplet on slippery lubricant impregnated porous surfaces (SLIPS), and other engineering strategies. Accordingly, the basic mechanism of droplet manipulation, devices configuration, and key features are presented. The recent cutting‐edge applications of directional droplet transport, including digital microfluidics, electric energy harvesting, fag/water collection, and oil‐water separation are also reviewed. At the end, current challenges and future perspectives in this field are discussed.

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Magnetic field assisted droplet manipulation on a soot-wax coated superhydrophobic surface of a PDMS-iron particle composite substrate

Cited by 32 publications

References 21 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

Directional Droplet Transport on Functional Surfaces with Superwettabilities

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