Origins of Extreme Liquid Repellency on Structured, Flat, and Lubricated Hydrophobic Surfaces

Daniel, Daniel; Timonen, Jaakko V. I.; Li, Ruoping; Velling, Seneca J.; Kreder, Michael J.; Tetreault, Adam; Aizenberg, Joanna

doi:10.1103/physrevlett.120.244503

Cited by 129 publications

(164 citation statements)

References 48 publications

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“…2) and F k is once again given by Equation 3. Experimentally, we found that F s is independent of the applied U (solid line in Figure 4c), similar to the friction behaviour of a water droplet on superhydrophobic lotus-leaf effect surfaces [8,20].…”

Section: Resultssupporting

confidence: 74%

“…Nonetheless, F fric is remarkably low. At the lowest speed U = 10 µm/s, F fric, min = 25 nN, much lower than that for lotusleaf effect surfaces (typically µN for speeds ranging from µm/s to mm/s) [8,20].…”

Section: Resultsmentioning

confidence: 81%

“…The measured adhesion and friction forces F adh/fric for a millimetric-sized oil droplet are on the order of tens of nN for a stable hydration state, but increase to several µN for an unstable hydration state. In comparison, F adh/fric is on the order of µN for similarly-sized water droplets on superhydrophobic surfaces exhibiting the lotus-leaf effect [20,22,23].…”

Section: Resultsmentioning

confidence: 96%

“…For example, for polyzwitterionic brush surfaces F fric, adh varies nonlinearly with U (∝ U 2/3 and U 0.6 , respectively), whereas for lotus-leaf effect surfaces F fric, adh is relatively insensitive to U ∼ mm/s or less [20,22,34,39]. Table I summarizes the functional forms of F fric, adh for three surface classes, as reported here and elsewhere in the literature [17,20,23,33,34]. The values of |F fric, adh | are for droplets of size 2R = 1-4 mm and speeds U = 0.01-2 mm/s, and as discussed previously, |F fric, adh | is much lower for polyzwitterionic brushes as compared to lotus-leaf effect and lubricated surfaces.…”

Section: Discussionmentioning

confidence: 99%

“…In this work (and our previous work [20]), we have presented the friction and adhesion force data in their nondimensionalized forms: F fric /2rγ or F adh /2Rγ vs. Ca. Figures 4c and 5c can be thought of as universal phase diagrams for liquid-repellency; F fric and F adh data for different classes of liquid-repellent surfaces and experimental conditions (different oils, droplet sizes, and speeds) can be plotted on the same graph for direct comparison.…”

Section: Discussionmentioning

confidence: 99%

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Hydration lubrication of polyzwitterionic brushes leads to nearly friction- and adhesion-free droplet motion

et al. 2019

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Recently, there has been much progress in the design and application of oil-repellent superoleophobic surfaces. Polyzwitterionic brush surfaces are of particular interest, because of their ability to repel oil under water, even in the absence of micro-/nano-structures. The origin of this underwater superoleophobicity is attributed to the presence of a stable water film beneath the oil droplet, but this had not been demonstrated experimentally. Here, using optical interferometric techniques, we show that an oil droplet effectively hydroplanes over a water film, whose thickness is between one hundred and hundreds of nanometres. In addition, using a custom-built Droplet Force Apparatus, we measured the friction and adhesion forces to be in the nN range for millimetric-sized droplets. These forces are much lower than for other classes of well-known liquid-repellent surfaces, including the lotus-leaf effect and lubricant-infused surfaces, where the typical force is on the order of µN. arXiv:1906.09910v2 [cond-mat.soft]

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Section: Resultssupporting

confidence: 74%

Section: Resultsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Hydration lubrication of polyzwitterionic brushes leads to nearly friction- and adhesion-free droplet motion

et al. 2019

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Non‐Adhesive SLIPS‐Like Surfaces

Hanosh,

George

2023

Progress in Adhesion and Adhesives

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Motion of Drops with Different Viscosities on Micro‐Nanotextured Surfaces of Varying Topography and Wetting Properties

Sarkiris

Ellinas

Gkiolas

et al. 2019

Adv Funct Materials

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Superhydrophobic surfaces are extensively investigated in the literature, yet the phenomenon of drop motion on such surfaces and the corresponding friction properties of surfaces with different topography are not sufficiently analyzed. Here, drop motion on hydrophobic and superhydrophobic surfaces with different size topography is investigated for drops of largely varying viscosity (i.e., water and glycerol). The threshold force required to initiate drop movement is probed, the drop motion (velocity and acceleration) is analyzed, and the friction force on each surface is calculated. It is evident that as roughness increases, the threshold force to initiate 20 µL drop motion decreases; the lowest value for water is 17.9 ± 4.0 µN. For glycerol, the lowest threshold force value is 22.3 ± 5.9 µN. The results also indicate that this threshold force required for the initiation of the drop motion seems to be higher than that when the drop starts moving. Finally, this force (being proportional to the contact line) is expected to be about half smaller for 5 µL droplets. Water drops obtain higher velocities and accelerations by an order of magnitude compared to glycerol drops, which is attributed to the combinational effect of the higher hysteresis and the larger contact line of glycerol drops.

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Origins of Extreme Liquid Repellency on Structured, Flat, and Lubricated Hydrophobic Surfaces

Cited by 129 publications

References 48 publications

Hydration lubrication of polyzwitterionic brushes leads to nearly friction- and adhesion-free droplet motion

Hydration lubrication of polyzwitterionic brushes leads to nearly friction- and adhesion-free droplet motion

Non‐Adhesive SLIPS‐Like Surfaces

Motion of Drops with Different Viscosities on Micro‐Nanotextured Surfaces of Varying Topography and Wetting Properties

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