Suppression of droplet pinch-off by early onset of interfacial instability

Lathia, Rutvik; Modak, Chandantaru Dey; Sen, Prosenjit

doi:10.1016/j.jcis.2023.05.067

Cited by 6 publications

(5 citation statements)

References 56 publications

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“…Control of the mass loading was obtained by fixing the initial volume of the LM and subsequently increasing its volume to 10 by merging it with the bare water droplet (Supplementary Fig. 5a ) 51 . The initial volume for the LM preparation is determined by the geometric relation , Where S and V are the surface area and the volume of the liquid drop, respectively.…”

Section: Methodsmentioning

confidence: 99%

Tunable encapsulation of sessile droplets with solid and liquid shells

Lathia,

Nagpal,

Modak

et al. 2023

Nat Commun

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Droplet encapsulations using liquid or solid shells are of significant interest in microreactors, drug delivery, crystallization, and cell growth applications. Despite progress in droplet-related technologies, tuning micron-scale shell thickness over a large range of droplet sizes is still a major challenge. In this work, we report capillary force assisted cloaking using hydrophobic colloidal particles and liquid-infused surfaces. The technique produces uniform solid and liquid shell encapsulations over a broad range (5–200 μm shell thickness for droplet volume spanning over four orders of magnitude). Tunable liquid encapsulation is shown to reduce the evaporation rate of droplets by up to 200 times with a wide tunability in lifetime (1.5 h to 12 days). Further, we propose using the technique for single crystals and cell/spheroid culture platforms. Stimuli-responsive solid shells show hermetic encapsulation with tunable strength and dissolution time. Moreover, scalability, and versatility of the technique is demonstrated for on-chip applications.

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Section: Methodsmentioning

confidence: 99%

Tunable encapsulation of sessile droplets with solid and liquid shells

Lathia,

Nagpal,

Modak

et al. 2023

Nat Commun

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“…187 On the contrary, jetting could be suppressed by higher mass loading of LMs at We (57−92) numbers resulting in interesting flower-shaped patterns. 185 This special feature occurs at lower We numbers as compared to the impact of bare droplets on SH surfaces. Next, the rebound phenomenon of droplet after retraction on granular beds is reviewed.…”

Section: Ohmentioning

confidence: 94%

“…Also, the “squashing” phenomena of highly coated LMs was captured where the satellite drop merges into the jammed jet structure . On the contrary, jetting could be suppressed by higher mass loading of LMs at We (57–92) numbers resulting in interesting flower-shaped patterns . This special feature occurs at lower We numbers as compared to the impact of bare droplets on SH surfaces.…”

Section: Comparison Of Drop Dynamics On Granular Media Vis-à-vis Har...mentioning

confidence: 99%

“…On another note, retraction of a highly particle-loaded LM on the SH surface was compared with that of a drop. The particles of the LM interact with the underlying SH surface causing perturbations and additional energy dissipations due to the development of a “roughness-based wettability contrast” . On the contrary, droplet impacting a SH surface would quickly retract due to high CAs and undergo jetting based on the We number.…”

Section: Comparison Of Drop Dynamics On Granular Media Vis-à-vis Har...mentioning

confidence: 99%

“…The particles of the LM interact with the underlying SH surface causing perturbations and additional energy dissipations due to the development of a “roughness-based wettability contrast”. 185 On the contrary, droplet impacting a SH surface would quickly retract due to high CAs and undergo jetting based on the We number. For droplet impact on powder surfaces, jetting depends upon the viscosity of droplet and the packing fraction of the granular bed.…”

Section: Comparison Of Drop Dynamics On Granular Media Vis-à-vis Hard...mentioning

confidence: 99%

See 2 more Smart Citations

Liquid Marbles and Drops on Superhydrophobic Surfaces: Interfacial Aspects and Dynamics of Formation: A Review

Sneha Ravi,

Dalvi

2024

ACS Omega

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Liquid marbles (LMs) are droplets encapsulated with powders presenting varied roughness and wettability. These LMs have garnered a lot of attention due to their dual properties of leakage-free and quick transport on both solid and liquid surfaces. These droplets are in a Cassie−Baxter wetting state sitting on both roughness and air pockets existing between particles. They are also reminiscent of the state of a drop on a superhydrophobic (SH) surface. In this review, LMs and bare droplets on SH surfaces are comparatively investigated in terms of two aspects: interfacial and dynamical. LMs present a fascinating class of soft matter due to their superior interfacial activity and their remarkable stability. Inherently hydrophobic powders form stable LMs by simple rolling; however, particles with defined morphologies and chemistries contribute to the varied stability of LMs. The factors contributing to this interesting robustness with respect to bare droplets are then identified by tests of stability such as evaporation and compression. Next, the dynamics of the impact of a drop on a hydrophobic powder bed to form LMs is studied vis-à-vis that of drop impact on flat surfaces. The knowledge from drop impact phenomena on flat surfaces is used to build and complement insights to that of drop impact on powder surfaces. The maximum spread of the drop is empirically understood in terms of dimensionless numbers, and their drawbacks are highlighted. Various stages of drop impact�spreading, retraction and rebound, splashing, and final outcome�are systematically explored on both solid and hard surfaces. The implications of crater formation and energy dissipations are discussed in the case of granular beds. While the drop impact on solid surfaces is extensively reviewed, deep interpretation of the drop impact on granular surfaces needs to be improved. Additionally, the applications of each step in the sequence of drop impact phenomena on both substrates are also identified. Next, the criterion for the formation of peculiar jammed LMs was examined. Finally, the challenges and possible future perspectives are envisaged.

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Two modes of contact‐time reduction in the impact of particle‐coated droplets on superhydrophobic surfaces

Lathia,

Modak,

Sen

2023

Droplet

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Reducing the contact time during droplet impact is essential for many scientific and industrial applications, such as self‐cleaning, anti‐icing, heat transfer, and condensation. This paper reports contact‐time reduction by coating droplets with micro–nano hydrophobic particles. Such particle‐coated droplets are known as liquid marbles (LM). LM impact on superhydrophobic surfaces reveals two different modes of contact‐time reduction. For lower impact energies, the reduced adhesion of LM with the surface is responsible for a reduction of up to 21%. Contact‐time reduction in this regime is found to be independent of particle size but dependent on the solid fraction of LM. However, a fragmentation‐based contact‐time reduction is observed for larger particle sizes and higher impact energies. Here, the reduction is as high as 65%. Such fragmentation occurs because the spreading LM lamella breaks when its thickness becomes similar to particle dimensions. Our findings reveal the potential of LM as a novel approach to reduce contact time during droplet impact, with implications for various scientific and industrial applications.

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Suppression of droplet pinch-off by early onset of interfacial instability

Cited by 6 publications

References 56 publications

Tunable encapsulation of sessile droplets with solid and liquid shells

Tunable encapsulation of sessile droplets with solid and liquid shells

Liquid Marbles and Drops on Superhydrophobic Surfaces: Interfacial Aspects and Dynamics of Formation: A Review

Two modes of contact‐time reduction in the impact of particle‐coated droplets on superhydrophobic surfaces

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