Unraveling stability of a floating liquid marble, its opening and resulting collapse patterns

Ravi, Apoorva Sneha; Dalvi, Sameer V.

doi:10.1016/j.colsurfa.2022.129347

Cited by 3 publications

(10 citation statements)

References 31 publications

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“…On the other hand, LMs made of smaller particles had enhanced attraction due to contact line undulation. A similar approach was used by Ravi et al to investigate both particle–particle and particle–liquid interactions for various floating LMs, and their stability was directly dependent on capillary interaction (γ int ) (Figure d). Additionally, a critical threshold value of γ int = 8 ± 5.6 mN/m was estimated to predict whether PTFE LMs can be prepared without rupture in the particle bed itself.…”

Section: Interfacial Properties Of Lmsmentioning

confidence: 99%

“…The puddle height method is commonly used to measure the effective surface tension of LMs (Figure a–f). Measuring the maximum height of large puddle-sized LMs gives a clue about the magnitude of capillary forces involved . Next, the pendant drop method showed the estimation of γ eff depending upon the pathway of the experiment and rearrangement of particles (Figure g).…”

Section: Interfacial Properties Of Lmsmentioning

confidence: 99%

“…WTs in LMs constitute a loss of their nonwetting nature as LM remains stuck with liquid partially wicking into the powder bed. Decreasing the surface tension of the core liquid of LM (Figure e) or decreasing hydrophobicity of particles coating LM shell leads to an irreversible WT from the Cassie to Wenzel state. This is similar to drop WTs on SH surfaces, which in turn depend on the surface tension of bare droplet as well as the degree of roughness of this surface .…”

Section: Interfacial Properties Of Lmsmentioning

confidence: 99%

“…LMs can be composed of both multilayers as well as monolayers based on the arrangement and method of preparation. − LMs are nonwetting, contamination-free, and stable to evaporation as compared to bare droplets . They can also be transported onto liquid substrates where they remain stable. , LMs are recognized as a highly versatile class of soft matter as they can be compressed, evaporated, divided, or coalesced based on the nature of the application.…”

Section: Introductionmentioning

confidence: 99%

“… 7 They can also be transported onto liquid substrates where they remain stable. 8 , 9 LMs are recognized as a highly versatile class of soft matter as they can be compressed, 10 evaporated, 11 divided, 12 or coalesced 13 based on the nature of the application.…”

Section: Introductionmentioning

confidence: 99%

See 4 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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Section: Interfacial Properties Of Lmsmentioning

confidence: 99%

Section: Interfacial Properties Of Lmsmentioning

confidence: 99%