A generalized variational approach for predicting contact angles of sessile nano-droplets on both flat and curved surfaces

Jasper, Warren J.; Anand, Nadish

doi:10.1016/j.molliq.2019.02.039

Cited by 43 publications

(22 citation statements)

References 25 publications

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“…The theoretical and experimental studies of the macroscopic bers give a detailed description of the interaction force and the shape of the drop placed onto a ber [10][11][12][13] or a set of bers. [14][15][16] Since electrospun bers are usually far smaller than the liquid drops, their wetting is studied using sophisticated experimental procedures, such as attaching an individual nanober to an AFM tip.…”

Section: Introductionmentioning

confidence: 99%

Wetting of electrospun nylon-11 fibers and mats

et al. 2021

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Section: Introductionmentioning

confidence: 99%

Wetting of electrospun nylon-11 fibers and mats

et al. 2021

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“…The modified Young–Lippmann equation to be applied is

with C dpc as the capacitance of the double-layer (dielectric plus photoconductive layer) and V dpc as the voltage drop across the double-layer. Both the denominator as well as the parameter γ in the above equation are related to the Laplace pressure and its case-dependent significance, respectively [ 52 , 53 ], which get strong for microdroplets with volumes well below 1 μ l; the Laplace pressure (related to the strong surface curvature of small droplets) works against the reduction of surface tension.…”

Section: Further Ewod and Oew Details [ 1 – 13 34 – 44 ]mentioning

confidence: 99%

Microdroplet Actuation via Light Line Optoelectrowetting (LL-OEW)

Doering

Strassner

Fouckhardt

2021

International Journal of Analytical Chemistry

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Meanwhile, electrowetting-on-dielectric (EWOD) is a well-known phenomenon, even often exploited in active micro-optics to change the curvature of microdroplet lenses or in analytical chemistry with digital microfluidics (DMF, lab on a chip 2.0) to move/actuate microdroplets. Optoelectrowetting (OEW) can bring more flexibility to DMF because in OEW, the operating point of the lab chip is locally controlled by a beam of light, usually impinging onto the chip perpendicularly. As opposed to pure EWOD, for OEW, none of the electrodes has to be structured, which makes the chip design and production technology simpler; the path of any actuated droplet is determined by the movement of the light spot. However, for applications in analytical chemistry, it would be helpful if the space both below as well as that above the lab chip were not obstructed by any optical components and light sources. Here, we report on the possibility to actuate droplets by laser light beams, which traverse the setup parallel to the chip surface and inside the OEW layer sequence. Since microdroplets are grabbed by this surface-parallel, nondiverging, and nonexpanded light beam, we call this principle “light line OEW” (LL-OEW).

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“…Additionally, the angle that the fluid makes with the wall while wetting is assumed to be 90 • . This is a standard assumption for solving sloshing flows [27,41].…”

Section: Governing Equationsmentioning

confidence: 99%

Analysis of a Symmetrical Ferrofluid Sloshing Vibration Energy Harvester

Anand

Gould

2021

Fluids

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Ferrofluid sloshing vibration energy harvesters use ferrofluid sloshing movement as a moving magnet between a fixed coil to induce current and, in turn, harvest energy from external excitations. A symmetric ferrofluid sloshing vibration energy harvester configuration is introduced in this study which utilizes four external, symmetrically placed, permanent magnets to magnetize a ferrofluid inside a tank. An external sinusoidal excitation of amplitude 1 m/s2 is imparted, and the whole system is studied numerically using a level-set method to track the sharp interface between ferrofluid and air. The system is studied for two significant length scales of 0.1 m and 0.05 m while varying the four external magnets’ polarity arrangements. All of the system configuration dimensions are parametrized with the length scale to keep the system configuration invariant with the length scale. Finally, a frequency sweep is performed, encompassing the structure’s first modal frequency and impedance matching to obtain the system’s energy harvesting characteristics.

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A generalized variational approach for predicting contact angles of sessile nano-droplets on both flat and curved surfaces

Cited by 43 publications

References 25 publications

Wetting of electrospun nylon-11 fibers and mats

Wetting of electrospun nylon-11 fibers and mats

Microdroplet Actuation via Light Line Optoelectrowetting (LL-OEW)

Analysis of a Symmetrical Ferrofluid Sloshing Vibration Energy Harvester

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