Linear Stepper Actuation Driving Drop Resonance and Modifying Hysteresis

Katariya, Mayur; Huynh, So Hung; McMorran, Darren; Lau, Chun Yat; Muradoglu, Murat; Ng, Tuck Wah

doi:10.1021/acs.langmuir.6b02115

Cited by 5 publications

(5 citation statements)

References 31 publications

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“…The circumference of the hole then contributes more strongly to the liquid–solid interface area requirement despite it retaining a Cassie wetting state. It should also be noted that the manner in which sessile drops with high contact angles are being constrained on inclines makes them less stable, imbuing them with a propensity to resonate when periodic , or stochastic , perturbations are introduced. We have noticed a similar resonant motion with perturbations, which may be linked to the geometry and composition of the liquid body.…”

Section: Resultsmentioning

confidence: 99%

“…A third SH substrate was used for the secondary experiment according to a method previously shown. 29 For this, a copper plate was polished to remove scratches using silicon carbide electrocoated water-proof abrasive paper (KMCA, WET/DRY S85 P600). Prior to use, it was first cleaned using absolute ethanol, allowed to air-dry, and then immersed in a 24.75 mM aqueous solution of silver nitrate (AgNO 3 ) for 1 min to form micro- and nanostructures.…”

Section: Methodsmentioning

confidence: 99%

“…A third SH substrate was used for the secondary experiment according to a method previously shown . For this, a copper plate was polished to remove scratches using silicon carbide electrocoated water-proof abrasive paper (KMCA, WET/DRY S85 P600).…”

Section: Methodsmentioning

confidence: 99%

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Drops on a Superhydrophobic Hole Hanging On under Evaporation

Chung¹,

Huynh²,

Katariya³

et al. 2017

ACS Omega

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Drops with larger volumes placed over a superhydrophobic (SH) surface with a hole do not fall through unless they are evaporated to a size that is small enough. This feature offers the ability to preconcentrate samples for biochemical analysis. In this work, the influence of pinning on the behavior of drops placed on a 0.1 mm thick SH substrate with a 2 mm diameter hole as they evaporated was investigated. With 16 μL of water dispensed, the sessile drop component volume was initially higher than that of the overhanging drop component and maintained this until the later stages where almost identical shapes were attained and full evaporation was achieved without falling off the hole. With 15 μL of water dispensed, the volume of the sessile drop was initially higher than that of the overhanging drop component but the liquid body was able to squeeze through the hole after 180 s due to the contact line not having sufficient pinning strength when it encountered the edge of the hole. This resulted in the liquid body either falling through the hole or remaining pinned with an oval-like shape. When it did not fall-off, the liquid body had volume and contact angle characteristics for the sessile drop and overhanging drop components that were reversed. In the later stages, however, nearly identical shapes were again attained and full evaporation was achieved without falling off the hole. The effects of pinning, despite the substrate being SH, offer another path toward achieving practical outcomes with liquid bodies without the need for chemical surface functionalization. Similarities and differences could be seen in the behavior of a sessile drop on a SH plate that was inclined at 30° to the horizontal and evaporated.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Drops on a Superhydrophobic Hole Hanging On under Evaporation

Chung¹,

Huynh²,

Katariya³

et al. 2017

ACS Omega

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“…Because the liquid body is subject to this form of perturbation, the surface tension forces involved can drive it to respond dynamically. This is also possible because of compressed air being used here which generates a more stochastic driving impetus as opposed to gravity forces acting alone. , It is noteworthy that resonant behavior had previously been observed in the presence of stochastic perturbations − and has been found to occur notwithstanding the small restoring forces developed from SH surfaces. , Although some small extent of this was discerned, the relatively short time period leading to dislodgement does not furnish the means to confirm this.…”

Section: Resultsmentioning

confidence: 79%

Simultaneous Multidrop Creation with Superhydrophobic Wells for Field Environmental Sensing of Nanoparticles

et al. 2018

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Facile creation of multiple drops at appropriate volumes on surfaces without the use of sophisticated instrumentation facilitates downstream evaporative preconcentration of liquid samples for analytical purposes. In this work, a superhydrophobic (SH) substrate comprising wells with a perforated mesh base was developed for simultaneous drop creation in a quick and convenient manner. In contrast to the method of pouring liquid directly over the SH wells, consistent liquid filling was readily achieved by a simple immersion approach. This method works well even for challenging situations where well diameters are smaller than 3.4 mm. Despite the poor liquid-retention properties of SH surfaces, inverting the wells did not result in liquid detachment under gravitational force, indicating strong pinning effects afforded by the well architecture. The perforated base of the well allowed the liquid to be completely removed from the well by compressed air. High-speed camera image processing was used to study the evolution of drop contact angle and displacement with time. It was found that the liquid body was able to undergo strong oscillations. Optical spectroscopy was used to confirm the ability of evaporative preconcentration of silver nanoparticles.

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“…This contrasts with an erstwhile method of generating streams of drops by driving liquid filaments through substrate strips that depend strongly on wetting at the contact line . The difference can be better appreciated when considering that as the liquid flow ensues and hydrostatic pressure decreases with drainage, the plastron, and thus the predominant Cassie wetting state, is restored (as has been demonstrated to be possible in other contexts , ) by the passage of air that axially envelopes the draining liquid body at the hole. While the air flow in this case is naturally limited, it provides an antithetical condition to the physical schemes that have been used to aid capillary jetting .…”

Section: Resultsmentioning

confidence: 99%

Millimeter-Sized Hole Damming

et al. 2017

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Valves used to control liquid filling and draining processes from storage typically need to be actuated. Here, we show that similar flow enabling and restricting operations can be achieved through millimeter scale holes that function according to the amount of hydrostatic pressure applied without any other intervention. This phenomena is exhibited using receptacles where the base is made of either a hydrophilic or superhydrophobic substrate with hole sizes ranging from 1.0-2.0 mm. The construction is such that the drainage flow velocities are of the same order in both substrates and follow Torricelli's law trends. Nevertheless, the primary mechanisms responsible for resisting the onset of flow in each substrate are different; nonbreaching of the advancing contact angle threshold in the former, and stable maintenance of an elastic-like deformation of the liquid-gas interface that is connected to the surrounding plastron in the latter. These differences are demonstrated using an upward jet of water delivered to the orifice, where a discharging flow from the hydrophilic base occurred before the threshold hydrostatic pressure condition was attained, while liquid from the jet is subsumed into the liquid body of the receptacle with the superhydrophobic base without any leakage. These findings portend advantages in simplicity and robustness for a myriad of liquid-related processes.

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Linear Stepper Actuation Driving Drop Resonance and Modifying Hysteresis

Cited by 5 publications

References 31 publications

Drops on a Superhydrophobic Hole Hanging On under Evaporation

Drops on a Superhydrophobic Hole Hanging On under Evaporation

Simultaneous Multidrop Creation with Superhydrophobic Wells for Field Environmental Sensing of Nanoparticles

Millimeter-Sized Hole Damming

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