Mobility of Aqueous and Binary Mixture Drops on Lubricating Fluid-Coated Slippery Surfaces

Sharma, Manish; Roy, Pritam Kumar; Barman, Jitesh; Khare, Krishnacharya

doi:10.1021/acs.langmuir.9b00483

Cited by 27 publications

(28 citation statements)

References 55 publications

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“…3.a and 3.c. Interestingly, in spite of much higher static viscosities, the average speed of PAA 10 drops with concentration somewhat below 2500 ppm is also comparable to that of glycerol/water drops, within the uncertainty related to the fact that the curves refer to different surfaces which may present slightly different lubricant thicknesses 41,42 . This result can be rationalized assuming that the effective viscosity of the moving PAA 10 drops is much lower due to the nite shear rate.…”

Section: Resultsmentioning

confidence: 74%

Oscillatory Motion of Viscoelastic Drops on Slippery Lubricated Surfaces

Sartori

Ferraro

Dassie

et al. 2021

Preprint

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The introduction of slippery lubricated surfaces allows the investigation of the flow of highly viscous solutions which otherwise will hardly move on standard solid surfaces. Here we present the study of the gravity induced motion of small viscoelastic drops deposited on inclined lubricated surfaces. The viscoelastic fluids exhibit shear thinning and, more importantly, a significant first normal stress difference N1. Despite the homogeneity of the surface and of the fluids, drops of sufficiently high N1 move down with an oscillating instantaneous speed whose frequency is found to be directly proportional to the average speed and inversely to the drop volume. The oscillatory motion is caused by the formation of a bulge at the drop rear that starts rolling around the moving drop.

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Section: Resultsmentioning

confidence: 74%

Oscillatory Motion of Viscoelastic Drops on Slippery Lubricated Surfaces

Sartori

Ferraro

Dassie

et al. 2021

Preprint

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“…31 In equilibrium, balancing the viscous stress on either side of the interface provides 32 In our experiment, μ D ≪ μ O , and the above scaling relation can be reduced to V i ≈ Vμ D h/μ O R. When it integrates over a surface area of order R 2 , we get the viscous stress in a droplet which scales as μ D V/R, which demonstrates that the dissipation in the droplet is due to the change in the droplet base radius induced by the change of the surface tension of the droplet. The viscous force in the droplet (F D ) scales as 33 F VR…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Smart Control for Water Droplets on Temperature and Force Dual-Responsive Slippery Surfaces

Liu

Zhu

et al. 2020

Langmuir

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Responsive slippery lubricant-infused porous surfaces (SLIPSs), featuring excellent liquid repelling/sliding capabilities in response to external stimuli, have attracted great attention in smart droplet manipulations. However, most of the reported responsive SLIPSs function under a single stimulus. Here, we report a kind of smart slippery surface capable of on-demand control between sliding and pinning for water droplets via alternately freezing/thawing the stretchable polydimethylsiloxane sheet in different strains. Diverse parameters are quantified to investigate the critical sliding volume of the droplet, including lubricant infusion amount, laser-scanning power, and pillar spacing. By virtue of the cooperation of temperature and force fields acting on the SLIPS, we demonstrate the intriguing applications including controllable chemical reaction and on-demand electrical circuit control. We envision that this dual-responsive surface should provide more possibilities in smart control of microscale droplets, especially in active vaccine-involved biochemical microreactions where a lower temperature is highly favored.

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“…Low shedding rate of droplets can affect the efficiency through clogging of the openings of meshes. The main approach to maximize the shedding rate is to add coatings (mainly hydrophobic) to the meshes which can reduce the contact angle hysteresis of the droplets that attach to the surface, and therefore, facilitate their drainage [13,14]. In a recent study, Shi et al [15] have shown that removing the horizontal wires and only using the vertical array of wires on meshes (called harps), can be an effective way to increase the shedding rate of fog droplets to avoid clogging, and therefore, enhancing the efficiency of the collector.…”

Section: Introductionmentioning

confidence: 99%

Fog harvesting: combination and comparison of different methods to maximize the collection efficiency

Sharifvaghefi

Kazerooni

2021

SN Appl. Sci.

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Fog harvesting is an unconventional source of water that can be used in some regions with water scarcity to overcome water shortages. The most commonly used collectors are meshes which have intrinsic limitations, the most important of which are clogging and aerodynamic deviation of droplets around the wires. Here, three techniques are compared and combined to overcome these limitations, i.e., replacing the mesh with an array of vertical wires, addition of a hydrophobic layer to the wires, and forcing the ionized droplets to move toward the wires by applying an electric field. The combination of these techniques was found to result in higher fog harvesting efficiency compared to each individual method with the highest impact from the addition of the electric field. The combined methods lead to a 60-fold increase in fog harvesting efficiency compared to meshes. The findings showed that when the fog droplets are forced in an electric field toward the wires, the shading coefficient for collectors can be increased to 1 from 0.55 (maximum for collectors without the electric field) without affecting the fog harvesting efficiency, allowing for lower construction cost of the collectors. Addition of the electric field showed two distinctive promotional effects. First, increasing the aerodynamic efficiency and second, reducing the size of droplets sliding down the wires by disturbing the three-phase contact line and reducing the contact angle hysteresis and the pinning force. Energy analysis shows that this technique can be 100 times more energy efficient compared to the conventional atmospheric water generators.

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Mobility of Aqueous and Binary Mixture Drops on Lubricating Fluid-Coated Slippery Surfaces

Cited by 27 publications

References 55 publications

Oscillatory Motion of Viscoelastic Drops on Slippery Lubricated Surfaces

Oscillatory Motion of Viscoelastic Drops on Slippery Lubricated Surfaces

Smart Control for Water Droplets on Temperature and Force Dual-Responsive Slippery Surfaces

Fog harvesting: combination and comparison of different methods to maximize the collection efficiency

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