Evaporation of water droplets from hydrophobic and hydrophilic nanoporous microcantilevers

Lee, Moonchan; Lee, Dongkyu; Jung, Namchul; Yun, Mi Young; Yim, Changyong; Jeon, Sangmin

doi:10.1063/1.3541958

Cited by 31 publications

(22 citation statements)

References 13 publications

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“…Figure 1 illustrates our process for the fabrication of the AAO microcantilevers (for more details, see the Experimental section) 18 19 20 . In brief, an electropolished aluminum sheet is anodized twice to produce hexagonally ordered nanopores.…”

Section: Resultsmentioning

confidence: 99%

CO2-Selective Nanoporous Metal-Organic Framework Microcantilevers

Yim

Lee

Yun

et al. 2015

Sci Rep

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Nanoporous anodic aluminum oxide (AAO) microcantilevers are fabricated and MIL-53 (Al) metal-organic framework (MOF) layers are directly synthesized on each cantilever surface by using the aluminum oxide as the metal ion source. Exposure of the MIL53-AAO cantilevers to various concentrations of CO2, N2, CO, and Ar induces changes in their deflections and resonance frequencies. The results of the resonance frequency measurements for the different adsorbed gas molecules are almost identical when the frequency changes are normalized by the molecular weights of the gases. In contrast, the deflection measurements show that only CO2 adsorption induces substantial bending of the MIL53-AAO cantilevers. This selective deflection of the cantilevers is attributed to the strong interactions between CO2 and the hydroxyl groups in MIL-53, which induce structural changes in the MIL-53 layers. Simultaneous measurements of the resonance frequency and the deflection are performed to show that the diffusion of CO2 into the nanoporous MIL-53 layers occurs very rapidly, whereas the binding of CO2 to hydroxyl groups occurs relatively slowly, which indicates that the adsorption of CO2 onto the MIL-53 layers and the desorption of CO2 from the MIL-53 layers are reaction limited.

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Section: Resultsmentioning

confidence: 99%

CO2-Selective Nanoporous Metal-Organic Framework Microcantilevers

Yim

Lee

Yun

et al. 2015

Sci Rep

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“…Thus, understanding the evaporation of such tiny or even nanoscale volumes of confined water is essential for many phenomena. Recent work shows that, on various solid surfaces, the evaporation of a thin film of water, i.e., 0.1 μm − 1 mm in thickness, is quite different from the evaporation from bulk water surfaces [12][13][14]. In 2012, based on molecular dynamics simulation, we found that as a surface changed from hydrophobic to hydrophilic, the evaporation rate of a small water aggregation (1000 water molecules) supported by the surface did not simply show a monotonic decrease.…”

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confidence: 99%

Enhancement of Water Evaporation on Solid Surfaces with Nanoscale Hydrophobic-Hydrophilic Patterns

et al. 2015

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Using molecular dynamics simulations, we show that the evaporation of nanoscale water on hydrophobic-hydrophilic patterned surfaces is unexpectedly faster than that on any surfaces with uniform wettability. The key to this phenomenon is that, on the patterned surface, the evaporation rate from the hydrophilic region only slightly decreases due to the correspondingly increased water thickness; meanwhile, a considerable number of water molecules evaporate from the hydrophobic region despite the lack of water film. Most of the evaporated water from the hydrophobic region originates from the hydrophilic region by diffusing across the contact lines. Further analysis shows that the evaporation rate from the hydrophobic region is approximately proportional to the total length of the contact lines.

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“…10,18,[20][21][22] Occasionally, evaporation begins in the CCR mode until the droplet reaches the receding contact angle, at which time it transitions to the CCA mode. 18,23,24 Recently, the effect of surface wettability on evaporation has been investigated extensively: hydrophilic surfaces and hydrophobic surfaces, 10,11,18,20,[25][26][27][28] and more specifically, superhydrophilic and superhydrophobic situations 10,18,20,[28][29][30][31][32][33] have been explored. Kulinich and Farzaneh 30 observed that water droplets evaporated rapidly on a surface with high contact angle hysteresis (CAH).…”

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confidence: 99%

Influence of surface temperature and wettability on droplet evaporation

Hsu

et al. 2015

Applied Physics Letters

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The evaporation characteristics of sessile water droplets on various wettability substrates (hydrophilic, hydrophobic, and mixed wettability surfaces) were experimentally investigated in this study. Placing droplets on a regulated superheated surface led to rapid vapor bubble formation. The droplet parameters, such as the contact angle and volume evolution over evaporation time, were experimentally measured. The results revealed that surface wettability plays a critical role not only in vapor bubble dynamics but also in evaporation. V C 2015 AIP Publishing LLC.

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Evaporation of water droplets from hydrophobic and hydrophilic nanoporous microcantilevers

Cited by 31 publications

References 13 publications

CO2-Selective Nanoporous Metal-Organic Framework Microcantilevers

CO2-Selective Nanoporous Metal-Organic Framework Microcantilevers

Enhancement of Water Evaporation on Solid Surfaces with Nanoscale Hydrophobic-Hydrophilic Patterns

Influence of surface temperature and wettability on droplet evaporation

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