Rebound of self-lubricating compound drops

Blanken, Nathan; Saleem, Muhammad Saeed; Antonini, Carlo; Thoraval, Marie-Jean

doi:10.1126/sciadv.aay3499

Cited by 53 publications

(35 citation statements)

References 76 publications

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“…2b, by increasing the Weber number, the normalized impact time t i , defined as the time until the arrested droplet reaches the maximum out-of-plane height H max , slightly fluctuates but has distinct values for different overlayer viscosities, suggesting a prominent role played by the overlayer. Interestingly, it has been reported that the addition of the lubricant can actually promote rebound by masking droplet/ substrate pinning 37 , a result that seems contradictory to our observation. To reconcile the apparent conflict, we compare the impact outcomes of different overlayer viscosities in Supplementary Fig.…”

Section: Resultscontrasting

confidence: 99%

“…Figure 2a shows the evolution of the normalized contact lengths D(t)/D 0 . Compared with pure water droplets, overlaid droplets take slightly longer to attain the maximum contact length, showing the influence of the overlayer on the impact, as described in previous studies [35][36][37] . In receding, D(t) of pure water decreases and returns to 0 upon rebound.…”

Section: Resultssupporting

confidence: 82%

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Slippery damper of an overlay for arresting and manipulating droplets on nonwetting surfaces

Han

Zhao

et al. 2021

Nat Commun

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In diverse processes, such as fertilization, insecticides, and cooling, liquid delivery is compromised by the super-repellency of receiving surfaces, including super-hydro-/omni-phobic and superheated types, a consequence of intercalated air pockets or vapor cushions that promote droplet rebounds as floating mass-spring systems. By simply overlaying impacting droplets with a tiny amount of lubricant (less than 0.1 vol% of the droplet), their interfacial properties are modified in such a way that damper-roller support is attached to the mass-spring system. The overlayers suppress the out-of-plane rebounds by slowing the departing droplets through viscous dissipation and sustain the droplets’ in-plane mobility through self-lubrication, a preferential state for scenarios such as shedding of liquid in spray cooling and repositioning of droplets in printing. The footprint of our method can be made to be minimal, circumventing surface contamination and toxification. Our method enables multifunctional and dynamic control of droplets that impact different types of nonwetting surfaces.

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Section: Resultscontrasting

confidence: 99%

Section: Resultssupporting

confidence: 82%

Slippery damper of an overlay for arresting and manipulating droplets on nonwetting surfaces

Han

Zhao

et al. 2021

Nat Commun

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“…The contact time τ of the bouncing droplet scales with the inertial‐capillary timescale τ 0 ∼ ( ρR 3 /γ) 1/2 , where ρ is the liquid density, R is the drop radius, and γ is the surface tension of the liquid, which is considered to be independent of the impact velocity but depends on the droplet radius. [ 40 ] Recently, Thoraval and co‐workers [ 41 ] reported that for the impact of water‐in‐oil compound droplets, water core unexpectedly rebounds below the threshold velocity independent of the surface wettabilities via the self‐lubricant of oil shell (Figure 3c).…”

Section: Impact Of Droplets On Solid Surfacesmentioning

confidence: 99%

Section: Impact Of Droplets On Solid Surfacesmentioning

confidence: 99%

Bioinspired Surface with Superwettability for Controllable Liquid Dynamics

Zhou

Jiang

Dong

2020

Adv Materials Inter

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Liquid dynamics on a solid surface, i.e., the impact, flow, or overflow, are ubiquitous in nature and cause multifaceted problems that affect daily life. Recent studies on the role of surface superwettability in controlling liquid dynamics have attracted much attention. The role of particular surface morphologies and surface chemical compositions in manipulating the liquid impact or transport dynamics has garnered diverse scientific interests and has encouraged the widespread use of surface wettabilities in practical applications. Herein, the recent progress according to the interaction method between the liquid and solid is classified and summarized. The crucial influence of surface wettabilities and structures on liquid dynamic behaviors and a critical survey of the mechanism behind these behaviors, along with emerging applications, challenges, and perspectives, are presented.

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“…Compound drops, consisting of multiple immiscible fluids, are encountered in a wide range of industrial applications [1], such as drug encapsulation [2,3], food industry [4,5], combustion [6,7], and additive manufacturing of complex (bio)materials [8][9][10]. The impact of these compound drops produces a rich variety of dynamics [1,[11][12][13][14][15][16][17][18][19]. In the case of a coaxial water-in-oil compound drop impacting on a solid surface, Blanken et.al [17] discovered the emergence of a very thin and fast oil jet during the rebound of the water core for some impact parameters.…”

Section: Introductionmentioning

confidence: 99%

Singular jets in compound drop impact

Mou¹,

Zhang²,

Jian-cun³

et al. 2021

Preprint

Self Cite

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Compound drop impacting on a solid surface is of considerable importance in industrial applications, such as combustion, food industry, and drug encapsulation. An intriguing phenomenon associated with this process is the occurrence of singular jets that are up to dozens of times faster than the impact velocity. These jets break into micro-droplets, which can produce aerosols and affect the quality of printing technologies. Here, we investigate experimentally and numerically the jetting process after a coaxial water-in-oil compound drop impacts on a glass substrate with different releasing heights and volumetric ratios. After impact, the water core spreads and retracts, giving rise to a vertical jet initially made of oil. For certain values of the impacting velocity, high speed and very thin jets are observed, the so-called singular jets. Depending on the volumetric ratio, one or two velocity peaks can be observed when varying the impact velocity, triggered by the contraction dynamics of a deep and cylindrical cavity. The self-similar time-evolution of the collapse for the first singularity regime follows a 1/2 power law in time, which can be derived from bubble pinch-off. In contrast, the collapse at the second peak follows a 2/3 power law, which can be accounted for by a balance between inertial and capillary forces.

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Rebound of self-lubricating compound drops

Cited by 53 publications

References 76 publications

Slippery damper of an overlay for arresting and manipulating droplets on nonwetting surfaces

Slippery damper of an overlay for arresting and manipulating droplets on nonwetting surfaces

Bioinspired Surface with Superwettability for Controllable Liquid Dynamics

Singular jets in compound drop impact

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