Contact angle of the ferronanofluid and influence of the magnetic field on the drying droplet

Mulka, R.; Zajączkowski, Bartosz; Neuber, E.; Buschmann, Matthias

doi:10.1016/j.ijft.2022.100152

Cited by 7 publications

(2 citation statements)

References 32 publications

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“…(a) Comparison of the present model with the experimental results of Banerjee and Sen at Bo M = 57.33, κ = 10.04, χ 0 = 0.5, and Ca = 0.0021. (b) Validating the present analytical model with Mulka et al’s experimental findings at Bo M ranging from 0 to 7.253 (corresponding to the H = 16,000 A/m), κ ranging from 0 to 1.087, χ 0 = 0.669, and Ca = 0.0022.…”

Section: Resultssupporting

confidence: 54%

“…The comparison of the dynamic shape modulations shows sound agreement. Mulka et al 22 conducted a series of experiments to demonstrate the impact of external magnetic fields on the contact angle difference (Δθ = θ M − θ 0 ) of a ferrofluid droplet (MSG-W10, FerroTec, USA) onto copper (EN CW008A, 99.99 wt % Cu) and aluminum (EN 6082/3.2315) surfaces, separately. Here, a rise in the contact angle was noticed when the field intensity was increased and the magnet was positioned sideways to the droplet as opposed to being positioned vertically above it.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Switchable Wettability States of a Ferrofluid Droplet atop a Hydrophobic Interface

Bhattacharjee,

Atta,

Chakraborty

2024

J. Phys. Chem. B

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Magnetically tuned soft machines offer great promise in performing a wide variety of programmable tasks via their dynamic shape adaptation and alteration. Despite dramatic recent advancements in this regard, selective reconfiguration of the wetting behavior of a ferrofluid droplet atop a hydrophobic interface adapted as a magnetically modulated micromachine remained elusive when the applied field intensity exceeds the saturation magnetization. Here we unveil a strategy to unsettle this perspective by harnessing a magnetic field-dependent magnetization phenomenon that may be exploited exclusively to arrive at highly controllable dynamic switchable wetting states of ferrofluid droplets, including the realization of wide ranges of contact angles for a given applied magnetic field. We arrive at a physical law from the resulting interplay of forces that quantifies the time dependence of the contact angle variation for a given magnetic field. Substantiated by experimental findings, our multiphysics-based simulations further evidence the possibilities of realizing switchable wetting states of soft magnetic matter over a wide range of physical parameters, delving into this principle. Disrupting the established notion of a trivially unique wetting phenomenon as governed by the droplet-substrate combination and the applied field alone, this paradigm may thus benefit a wide variety of practical applications, ranging from digital microfluidics to recombination chemistry.

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Section: Resultssupporting

confidence: 54%

Section: Resultsmentioning

confidence: 99%