Dynamics Behavior of Droplet Impact on a Controllable Curved Micropillar Array Surface Induced by a Magnetic Field

Liu, Xinyuan; Jia, Li; Ding, Yi; Wang, Xiaowei; Xu, Jinzhu

doi:10.1021/acs.langmuir.3c00162

Cited by 13 publications

(7 citation statements)

References 39 publications

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“…At a lower release height, the droplet exhibits directional bouncing without fragmentation as shown in Figure e-iv. The WP-MRSA allows precise and large tunability of wire inclination angle β, which may lead to a regulation of directional bouncing dynamics for various applications. ,− As for the case of largely inclined wires (β ≈ 80°), the directional fragmentation or motion of the droplet cannot be found because the wires are nearly horizontally aligned without any directionality (Figure f-ii). Most interestingly, wire inclinations significantly affect contact time.…”

Section: Resultsmentioning

confidence: 99%

Bioinspired Wire-on-Pillar Magneto-Responsive Superhydrophobic Arrays

Wei

Zong

Jiang

2023

ACS Appl. Mater. Interfaces

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Versatile surfaces demonstrating multiple interfacial functionalities are highly demanded as a surface typically serves various duties and faces multiple challenges in real practice. However, such versatile surfaces are rarely reported mainly due to the challenges in integrating multiple structural characteristics. Here, by mimicking lotus leaves, butterfly wing, and respiratory cilia, we develop a surface termed wire-on-pillar magneto-responsive superhydrophobic arrays (WP-MRSA), which possess interfacial properties of structural superhydrophobicity, anisotropicity, stimuli responsiveness, and flexibility. By combining soft lithography and self-alignment of iron-laden aerosols under a magnetic field, iron-laden wires are planted atop prefabricated pillar arrays, resulting in well-ordered, sparse, high-aspect-ratio, flexible, and superhydrophobic wires, which largely deflect in response to a magnetic field. This unique integration of structural properties and configurations enables various functionalities, such as on-demand control of droplet impact dynamics, real-time regulation of surface lateral adhesion force, fast removal and sorting of objects, and precise manipulation of droplets for selective reactions. Those functionalities benefit various applications especially droplet-based microfluidics and active self-cleaning surfaces.

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Section: Resultsmentioning

confidence: 99%

Bioinspired Wire-on-Pillar Magneto-Responsive Superhydrophobic Arrays

Wei

Zong

Jiang

2023

ACS Appl. Mater. Interfaces

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“…The study of the effect of the magnetic field intensity on the inclination angle of the micropillar had been given in the previous study. 32 The experimental system is shown in Figure 2. By adjusting the current intensity and direction of the DC power (F2031, CH-Magnetoelectricity Technology) supply for the electromagnet (CH-50, CH-Magnetoelectricity Technology), the magnetic field strength and direction were changed, which were measured by a Gaussian meter (CH-1500, CH-Magnetoelectricity Technology), to change the inclination angle of the micropillar.…”

Section: ■ Methodsmentioning

confidence: 99%

“…When the surface was induced by a magnetic field, the micropillar array tilted and the tilt angle varied dynamically with the intensity of the magnetic field. The study of the effect of the magnetic field intensity on the inclination angle of the micropillar had been given in the previous study …”

Section: Methodsmentioning

confidence: 99%

Directional Rebound of Microdroplets on a Magneto-Responsive Micropillar Array Surface

Liu,

Jia,

Dang

et al. 2023

Langmuir

Self Cite

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The manipulation of droplet movement behavior is of scientific importance and has practical applications in many fields, such as biological analysis, water collection, oil−water separation, deicing, antifrosting, and so on. Using the magnetoresponsive surface to dynamically change the surface morphology is an effective method to realize droplet manipulation. A replica molding technique was used to fabricate the surface with the magneto-responsive micropillar array, and the direction of the micropillar array could be changed dynamically with the magnetic induction intensity. The mechanism of the droplet directional rebound on the magneto-responsive surface and the implementation of the controllability of droplet movement were investigated. On the magneto-responsive surface, it was achievable to realize the directional rebound of droplets on the micrometer scale. The critical condition for the droplet directional rebound was identified. The force and energy of the droplet during the spreading and retraction stages were analyzed, which lay a theoretical foundation for the precise control of droplet directional rebound.

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“…Furthermore, the microstructure of the frame and channel was investigated. The image analysis software ImageJ [46,47] was used to evaluate the fiber orientation distribution. It is obvious that the fibers at the frame were oriented along the wire axis with a high fiber packing density (Figure 1f,g).…”

Section: Fabrication Microstructure and Formation Mechanism Of The Tr...mentioning

confidence: 99%

Transparent Nanofibrous Membranes with Optimized Optical Channel Structure for Window Screens

Sun,

Lin,

et al. 2024

Adv Materials Technologies

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Nanofibrous membranes, characterized by their flexibility, high porosity, and tunable structure, are emerging as a promising contender for advanced transparent materials with sufficient breathability and pliability. However, the considerable surface light reflection and internal light scattering of nanofibrous membranes pose a challenging task in achieving transparency. In this study, transparent nanofibrous membranes are fabricated by constructing a topological structure with optimized optical transmission channels, which provide the minimum equivalent thickness to minimize light loss in nanofibrous membranes. The resultant fabricated membrane exhibits a high light transmittance of up to 81%, along with a sufficient porosity of 84% and flexibility. Additionally, the membrane demonstrated effective PM0.3–10 removal efficiency (>91%), low air pressure drops (<110 Pa), high air permeability (≈104 mm s−1), and good waterproof performance. Therefore, the prepared transparent nanofibrous membrane may serve as a transparent air filtration window screen to enhance indoor comfort for people.

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Dynamics Behavior of Droplet Impact on a Controllable Curved Micropillar Array Surface Induced by a Magnetic Field

Cited by 13 publications

References 39 publications

Bioinspired Wire-on-Pillar Magneto-Responsive Superhydrophobic Arrays

Bioinspired Wire-on-Pillar Magneto-Responsive Superhydrophobic Arrays

Directional Rebound of Microdroplets on a Magneto-Responsive Micropillar Array Surface

Transparent Nanofibrous Membranes with Optimized Optical Channel Structure for Window Screens

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