Autonomous transport and splitting of a droplet on an open surface

Chowdhury, Imdad Uddin; Mahapatra, Pallab Sinha; Sen, A. K.; Pattamatta, Arvind; Tiwari, Manish K.

doi:10.1103/physrevfluids.6.094003

Cited by 15 publications

(16 citation statements)

References 44 publications

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“…To the best of the authors’ knowledge, no work exists for multiscale modeling capable of resolving the surface roughness features at the micro and nanoscales, while at the same time capturing fluid transport at the millimeter scale on an open surface. Although there are several works on droplet coalescence on an open surface, and capillarity-aided droplet-splitting upon impact, droplet splitting during capillary-driven transport remains rare …”

Section: Passive Liquid-transport Mechanismsmentioning

confidence: 99%

“…Considerable focus has already been devoted to this topic but challenges still remain. Methods of splitting droplets in closed channel flows (i.e., Y-shaped and L-shaped junctions) do not always extend to open-channel microfluidic flows, although some progress has been made. ,, …”

Section: Passive Liquid-transport Mechanismsmentioning

confidence: 99%

“…Although there are several works on droplet coalescence on an open surface, and capillarity-aided droplet-splitting upon impact, 33 droplet splitting during capillary-driven transport remains rare. 176…”

Section: Transport Along Three-dimensional Conical Structuresmentioning

confidence: 99%

“…Methods of splitting droplets in closed channel flows (i.e., Yshaped and L-shaped junctions) do not always extend to openchannel microfluidic flows, although some progress has been made. 33,176,239 A frontier issue that has remained unaddressed is wettability tuning on-the-go. For instance, questions that have dawned in the surface microfluidics community are: Can the wettability be tuned selectively during the transport?…”

Section: Fluidic Valving and Gatingmentioning

confidence: 99%

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Patterning Wettability for Open-Surface Fluidic Manipulation: Fundamentals and Applications

et al. 2022

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Effective manipulation of liquids on open surfaces without external energy input is indispensable for the advancement of point-of-care diagnostic devices. Open-surface microfluidics has the potential to benefit health care, especially in the developing world. This review highlights the prospects for harnessing capillary forces on surface-microfluidic platforms, chiefly by inducing smooth gradients or sharp steps of wettability on substrates, to elicit passive liquid transport and higher-order fluidic manipulations without off-the-chip energy sources. A broad spectrum of the recent progress in the emerging field of passive surface microfluidics is highlighted, and its promise for developing facile, low-cost, easy-to-operate microfluidic devices is discussed in light of recent applications, not only in the domain of biomedical microfluidics but also in the general areas of energy and water conservation.

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Section: Passive Liquid-transport Mechanismsmentioning

confidence: 99%

Section: Passive Liquid-transport Mechanismsmentioning

confidence: 99%

Section: Transport Along Three-dimensional Conical Structuresmentioning

confidence: 99%

Section: Fluidic Valving and Gatingmentioning

confidence: 99%

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Patterning Wettability for Open-Surface Fluidic Manipulation: Fundamentals and Applications

et al. 2022

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“…Typical references are refs. [71][72][73][74][75][76][77][78][79][80][81][82][83][84][85]. A brief summary of these works for l d ∼ l p is as follows.…”

Section: Introductionmentioning

confidence: 99%

Wetting Effect on Patterned Substrates

Wang

Nestler

2023

Advanced Materials

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A droplet deposited on a solid substrate leads to the wetting phenomenon. A natural observation is the lotus effect, known for its superhydrophobicity. This special feature is engendered by the structured microstructure of the lotus leaf, namely, surface heterogeneity, as explained by the quintessential Cassie-Wenzel theory (CWT). In this work, recent designs of functional substrates are overviewed based on the CWT via manipulating the contact area between the liquid and the solid substrate as well as the intrinsic Young's contact angle. Moreover, the limitation of the CWT is discussed. When the droplet size is comparable to the surface heterogeneity, anisotropic wetting morphology often appears, which is beyond the scope of the Cassie-Wenzel work. In this case, several recent studies addressing the anisotropic wetting effect on chemically and mechanically patterned substrates are elucidated. Surface designs for anisotropic wetting morphologies are summarized with respect to the shape and the arrangement of the surface heterogeneity, the droplet volume, the deposition position of the droplet, as well as the mean curvature of the surface heterogeneity. A thermodynamic interpretation for the wetting effect and the corresponding open questions are presented at the end.

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