Impact dynamics on SLIPS: Effects of liquid droplet’s surface tension and viscosity

Baek, Seunghyeon; Yong, Kijung

doi:10.1016/j.apsusc.2019.144689

Cited by 32 publications

(12 citation statements)

References 29 publications

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“…345 This is mostly true with LIS, with several reports supporting this scaling. 60,64,150,158 Droplet impacts do not always follow this scaling, however, with droplets with a higher viscosity than water showing a scaling closer to We 1/5 . 150,158 LIS and superhydrophobic surfaces exhibit similar properties, but the presence of the lubricant layer causes several differences in how droplets impact.…”

Section: Droplet Impactmentioning

confidence: 98%

“…60,64,150,158 Droplet impacts do not always follow this scaling, however, with droplets with a higher viscosity than water showing a scaling closer to We 1/5 . 150,158 LIS and superhydrophobic surfaces exhibit similar properties, but the presence of the lubricant layer causes several differences in how droplets impact. The most notable of these is that LIS have higher static adhesion, so droplets generally do not bounce off the surface of LIS.…”

Section: Droplet Impactmentioning

confidence: 98%

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Life and death of liquid-infused surfaces: a review on the choice, analysis and fate of the infused liquid layer

et al. 2020

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Section: Droplet Impactmentioning

confidence: 98%

Section: Droplet Impactmentioning

confidence: 98%

Life and death of liquid-infused surfaces: a review on the choice, analysis and fate of the infused liquid layer

et al. 2020

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“…In the past few decades, extensive studies have been devoted to studying the maximum spreading factor experimentally, numerically, and theoretically. − It is acknowledged that the impact dynamics are generally characterized by three dimensionless numbers: Weber number We = ρU 0 2 D 0 /γ, Reynolds number Re = ρU 0 D 0 /μ, and Ohnesorge number Oh = We 1/2 / Re . Here ρ, μ, γ, and U 0 represent the density, viscosity, surface tension, and impact velocity, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…The previous work of Pasandideh-Fard et al and Ukiwe et al facilitated development of the theoretical model of maximum spreading factor. Since then, eqs and have been widely applied to impact dynamics study on smooth surfaces, − and various theoretical models of the maximum spreading factor on microstructured and chemically patterned surfaces have been proposed. − …”

Section: Introductionmentioning

confidence: 99%

Analytical Consideration for the Maximum Spreading Factor of Liquid Droplet Impact on a Smooth Solid Surface

Wang

et al. 2021

Langmuir

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Based on the energy conservation approach, this study develops a universal model to predict the maximum spreading factor of liquid droplet impact on a smooth solid surface. Validated with the present simulations and experiments in the literature, this model effectively overcomes the limitation of previous models in the viscous regime and greatly reduces the computing errors from over 30% to below 6%. It is demonstrated that the underestimated maximum spreading factor by previous models results from the overestimation of viscous dissipation. By replacing the conventional model of spreading time, t m = 8D 0 /3U 0 , with a more precise one, t m = 1.47τ i We −0.44 , the formulation to compute the viscous dissipation of entire spreading is improved. Finally, we examine the applicability of present model in the capillary regime and good performance is also shown.

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“…Their results showed that, while rough surfaces promote droplet instabilities during the spreading, lubricant infusion on the surface damps the droplet's interfacial vibrations during its spreading and retraction phases. Baek et al 37 showed that surface tension and viscosity play important roles in droplet impact dynamics, and liquid viscosity and surface tension are the control parameters to change the maximum spreading radius and contact time.…”

Section: Introductionmentioning

confidence: 99%

Surface Acoustic Waves to Control Droplet Impact onto Superhydrophobic and Slippery Liquid-Infused Porous Surfaces

Biroun

Haworth

Agrawal

et al. 2021

ACS Appl. Mater. Interfaces

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Superhydrophobic coatings and slippery liquid-infused porous surfaces (SLIPS) have shown their potentials in self-cleaning, anti-icing, antierosion, and antibiofouling applications. Various studies have been done on controlling the droplet impact on such surfaces using passive methods such as modifying the lubricant layer thickness in SLIPS. Despite their effectiveness, passive methods lack on-demand control over the impact dynamics of droplets. This paper introduces a new method to actively control the droplet impact onto superhydrophobic and SLIPS surfaces using surface acoustic waves (SAWs). In this study, we designed and fabricated SLIPS on ZnO/aluminum thin-film SAW devices and investigated different scenarios of droplet impact on the surfaces compared to those on similar superhydrophobic-coated surfaces. Our results showed that SAWs have insignificant influences on the impact dynamics of a porous and superhydrophobic surface without an infused oil layer. However, after infusion with oil, SAW energy could be effectively transferred to the droplet, thus modifying its impact dynamics onto the superhydrophobic surface. Results showed that by applying SAWs, the spreading and retraction behaviors of the droplets are altered on the SLIPS surface, leading to a change in a droplet impact regime from deposition to complete rebound with altered rebounding angles. Moreover, the contact time was reduced up to 30% when applying SAWs on surfaces with an optimum oil lubricant thickness of ∼8 μm. Our work offers an effective way of applying SAW technology along with SLIPS to effectively reduce the contact time and alter the droplet rebound angles.

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Impact dynamics on SLIPS: Effects of liquid droplet’s surface tension and viscosity

Cited by 32 publications

References 29 publications

Life and death of liquid-infused surfaces: a review on the choice, analysis and fate of the infused liquid layer

Life and death of liquid-infused surfaces: a review on the choice, analysis and fate of the infused liquid layer

Analytical Consideration for the Maximum Spreading Factor of Liquid Droplet Impact on a Smooth Solid Surface

Surface Acoustic Waves to Control Droplet Impact onto Superhydrophobic and Slippery Liquid-Infused Porous Surfaces

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