Dynamics of Nanodroplets on Vibrating Surfaces

Pillai, Rohit; Borg, Matthew K.; Reese, Jason M.

doi:10.1021/acs.langmuir.8b02066

Cited by 22 publications

(9 citation statements)

References 42 publications

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“…2,31,[34][35][36] In such cases, a transition zone close to the contact line ensures the continuity of hydrostatic pressure between the spherical part of the droplet and an underlying thin film of liquid constituted of molecules continuously adsorbing and desorbing on the substrate. 37,38 Dynamic molecular simulations do predict the existence of such a regime, [39][40][41] Our present experiments are carried within an environment saturated by the sprayed mist of 2-propanol molecules, hence the sessile droplets we investigate should be accompanied by such extended film [42][43][44] lying on the resonator surface. 29 This thin (precursor) film is essential to understand the wetting of the deposited droplet and the final stages of its evaporation.…”

Section: Resultsmentioning

confidence: 99%

Optomechanical measurement of single nanodroplet evaporation with millisecond time-resolution

Sbarra¹,

Waquier²,

Suffit³

et al. 2022

Preprint

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Tracking the evolution of an individual nanodroplet of liquid in real-time remains an outstanding challenge. Here a miniature optomechanical resonator detects a single nanodroplet landing on a surface and measures its subsequent evaporation down to a volume of twenty attoliters. The ultra-high mechanical frequency and sensitivity of the device enable a time resolution below the millisecond, sufficient to resolve the fast evaporation dynamics under ambient conditions. Using the device dual optical and mechanical capability, we determine the evaporation in the first ten milliseconds to occur at constant contact radius with a dynamics ruled by the mere Kelvin effect, producing evaporation despite a saturated surrounding gas. Over the following hundred of milliseconds, the droplet further shrinks while being accompanied by the spreading of an underlying puddle. In the final steady-state after evaporation, an extended thin liquid film is stabilized on the surface. Our optomechanical technique opens the unique possibility of monitoring all these stages in real-time.

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Section: Resultsmentioning

confidence: 99%

Optomechanical measurement of single nanodroplet evaporation with millisecond time-resolution

Sbarra¹,

Waquier²,

Suffit³

et al. 2022

Preprint

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“…Equilibration runs of 15 ns were performed in all cases, while presented results were averaged over production trajectories of 20 ns. The adopted simulation time is much longer than the ones typically adopted for water nanodroplet simulations [66,84], in particular no signal of water molecule evaporation from the droplet was detected.…”

Section: Models and Methodsmentioning

confidence: 99%

“…Importantly, the study of confined water and of water nanostructures has gained increasing momentum in the recent years, from both experimental and modelling investigations [65,66,67,68,69,70,71,72,73]. It is well established that these exotic phases of water exhibit unusual physicochemical and structural properties [74,75,76,77,78,79,80,81,82].…”

Section: Introductionmentioning

confidence: 99%

“…It is well established that these exotic phases of water exhibit unusual physicochemical and structural properties [74,75,76,77,78,79,80,81,82]. Water nanodroplets, for example, can maintain the liquid state at temperatures well below water freezing point at normal conditions [65], and exhibit intriguing behaviors—from evaporation to droplet lift-off—when in contact with oscillating surfaces [66]. These properties might also be exploited to gather a deeper knowledge of biomolecules in nanoscale confinement.…”

Section: Introductionmentioning

confidence: 99%

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Confining a Protein-Containing Water Nanodroplet inside Silica Nanochannels

Giussani

Tabacchi

Coluccia

et al. 2019

IJMS

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Incorporation of biological systems in water nanodroplets has recently emerged as a new frontier to investigate structural changes of biomolecules, with perspective applications in ultra-fast drug delivery. We report on the molecular dynamics of the digestive protein Pepsin subjected to a double confinement. The double confinement stemmed from embedding the protein inside a water nanodroplet, which in turn was caged in a nanochannel mimicking the mesoporous silica SBA-15. The nano-bio-droplet, whose size fits with the pore diameter, behaved differently depending on the protonation state of the pore surface silanols. Neutral channel sections allowed for the droplet to flow, while deprotonated sections acted as anchoring piers for the droplet. Inside the droplet, the protein, not directly bonded to the surface, showed a behavior similar to that reported for bulk water solutions, indicating that double confinement should not alter its catalytic activity. Our results suggest that nanobiodroplets, recently fabricated in volatile environments, can be encapsulated and stored in mesoporous silicas.

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“…They found three phenomena: fully climbing the step, partially climbing the step, and being blocked by the step, which relied on the normalized step height. MD simulations were also adopted to investigate the influences of surfaces vibrating with high frequency on the wetting mechanism, evaporation, and transportation of nanodroplets [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation on Behaviors of Water Nanodroplets Impinging on Moving Surfaces

2022

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Droplets impinging on solid surfaces is a common phenomenon. However, the motion of surfaces remarkably influences the dynamical behaviors of droplets, and related research is scarce. Dynamical behaviors of water nanodroplets impinging on translation and vibrating solid copper surfaces were investigated via molecular dynamics (MD) simulation. The dynamical characteristics of water nanodroplets with various Weber numbers were studied at four translation velocities, four vibration amplitudes, and five vibration periods of the surface. The results show that when water nanodroplets impinge on translation surfaces, water molecules not only move along the surfaces but also rotate around the centroid of the water nanodroplet at the relative sliding stage. Water nanodroplets spread twice in the direction perpendicular to the relative sliding under a higher surface translation velocity. Additionally, a formula for water nanodroplets velocity in the translation direction was developed. Water nanodroplets with a larger Weber number experience a heavier friction force. For cases wherein water nanodroplets impinge on vibration surfaces, the increase in amplitudes impedes the spread of water nanodroplets, while the vibration periods promote it. Moreover, the short-period vibration makes water nanodroplets bounce off the surface.

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Dynamics of Nanodroplets on Vibrating Surfaces

Cited by 22 publications

References 42 publications

Optomechanical measurement of single nanodroplet evaporation with millisecond time-resolution

Optomechanical measurement of single nanodroplet evaporation with millisecond time-resolution

Confining a Protein-Containing Water Nanodroplet inside Silica Nanochannels

Molecular Dynamics Simulation on Behaviors of Water Nanodroplets Impinging on Moving Surfaces

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