Evaporation of squeezed water droplets between two parallel hydrophobic/superhydrophobic surfaces

He, Xukun; Cheng, Jiangtao; Collier, C. Patrick; Srijanto, Bernadeta; Briggs, Dayrl P.

doi:10.1016/j.jcis.2020.05.003

Cited by 19 publications

(18 citation statements)

References 63 publications

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“…2d. Similar to our findings of droplet evaporation between two parallel hydrophobic surfaces [35], the apparently prolonged evaporation time (2 hours) of the droplets dwelling between non-parallel surfaces indicates that evaporation was also greatly suppressed therein due to the substantial vapor enrichment within the confined space. However, the continuously shrinking contact line and the contact angle distribution of the evaporating droplet in the configuration of non-parallel surfaces are not symmetric anymore.…”

Section: Evaporation-triggered Lateral Transport Of Droplets Confined...supporting

confidence: 88%

“…In our previous study [35], the evaporation of squeezed droplets between two parallel hydrophobic/superhydrophobic surfaces was found to be significantly suppressed due to the vapor enrichment inside the confined space. Thus, in this work, we assume the evaporation of confined droplets between two non-parallel surfaces as a quasi-steady process, which means the transient shape of an evaporating droplet could be approximated by its profile at the equilibrium state.…”

Section: Simulation Setupmentioning

confidence: 88%

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Evaporation-triggered directional transport of asymmetrically confined droplets

Cheng

2021

Journal of Colloid and Interface Science

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Section: Evaporation-triggered Lateral Transport Of Droplets Confined...supporting

confidence: 88%

Section: Simulation Setupmentioning

confidence: 88%

Evaporation-triggered directional transport of asymmetrically confined droplets

Cheng

2021

Journal of Colloid and Interface Science

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“…During the drop evaporation, two accepted theories for profile evolution are constant contact radius mode (the droplet is pinned to the surface and the height of the drop falls as the fluid evaporates) and constant contact angle mode (the radius decreases but the contact angle remains constant) [ 34 ]. In reality a combination of both usually occurs until the fluid is completely evaporated [ 30 ].…”

Section: Resultsmentioning

confidence: 99%

Preparation of Polyetherimide Nanoparticles by a Droplet Evaporation-Assisted Thermally Induced Phase-Separation Method

Zhu

Zhang

2021

Polymers

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The droplet evaporation effect on the preparation of polyetherimide (PEI) nanoparticles by thermally induced phase separation (TIPS) was studied. PEI nanoparticles were prepared in two routes. In route I, the droplet evaporation process was carried out after TIPS. In route II, the droplet evaporation and TIPS processes were carried out simultaneously. The surface tension and shape parameters of samples were measured via a drop shape analyzer. The Z-average particle diameter of PEI nanoparticles in the PEI/dimethyl sulfoxide solution (DMSO) suspension at different time points was tested by dynamic light scattering, the data from which was used to determine the TIPS time of the PEI/DMSO solution. The natural properties of the products from both routes were studied by optical microscope, scanning electron microscope and transmission electron microscope. The results show that PEI nanoparticles prepared from route II are much smaller and more uniform than that prepared from route I. Circulation flows in the droplet evaporation were indirectly proved to suppress the growth of particles. At 30 °C, PEI solid nanoparticles with 193 nm average particle size, good uniformity, good separation and good roundness were obtained. Route I is less sensitive to temperature than route II. Samples in route I were still the accumulations of micro and nanoparticles until 40 °C instead of 30 °C in route II, although the particle size distribution was not uniform. In addition, a film structure would appear instead of particles when the evaporation temperature exceeds a certain value in both routes. This work will contribute to the preparation of polymer nanoparticles with small and uniform particle size by TIPS process from preformed polymers.

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“…Therefore, for the sake of simplicity, here, we consider that the volume of the squeezed droplet forms an effective cylinder, being r d the cylinder-equivalent radius for the drop base. More accurate calculations accounting for either the concavity [22] or the convexity [23] of the liquid-air interfacial area can be found in recent papers. On the other hand, for ideal gases ( )…”

Section: The Evaporation Kinetics Of Confined Dropletsmentioning

confidence: 99%

Extending Lifetime of Water Droplets Using Mirror‐Nanoporous Surfaces

Bellino

2020

Adv Materials Inter

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to integrate versatile platforms, the low reagent/sample consumption, and the high throughput that can be achieved via automation. [5] To perform assays on such small liquid volumes (i.e., microliter range), especially in many bioapplications that require operation at physiological temperature (37 °C), it is critical to reduce the evaporation rate of the droplets to expand their lifetime. Physiological temperature is indeed necessary in the operation of a wide range of biochemical assays, such as in most cell culture techniques [6] (from single [7] to 3D cell culture [8]) and several enzymebased analysis. [9] To date, methods to slow down droplet evaporation generally use high-humidity chambers or put the droplets under an oxygen-permeable biocompatible oil barrier.

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Evaporation of squeezed water droplets between two parallel hydrophobic/superhydrophobic surfaces

Cited by 19 publications

References 63 publications

Evaporation-triggered directional transport of asymmetrically confined droplets

Evaporation-triggered directional transport of asymmetrically confined droplets

Preparation of Polyetherimide Nanoparticles by a Droplet Evaporation-Assisted Thermally Induced Phase-Separation Method

Extending Lifetime of Water Droplets Using Mirror‐Nanoporous Surfaces

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