The effect of surface wettability on water vapor condensation in nanoscale

Dong, Ning; Tang, G.H.

doi:10.1038/srep19192

Cited by 51 publications

(40 citation statements)

References 28 publications

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“…The sensor also exhibited high tolerance to temperature change. The unprecedented performance of the sensor was attributed to the specially designed CVD growth process, which intentionally created defects and grain boundaries to increase the sensitivity to water vapor . In addition, the hydrophobicity and rough surface of the graphene was able to prevent the aggregation of water droplets, which contributed to the ultrafast water evaporation and high stability of the sensor at high‐humidity levels .…”

Section: Introductionmentioning

confidence: 99%

Formation of Uniform Water Microdroplets on Wrinkled Graphene for Ultrafast Humidity Sensing

Zhen

Zhao

et al. 2018

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121

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Portable humidity sensors with ultrafast responses fabricated in wearable devices have promising application prospects in disease diagnostics, health status monitoring, and personal healthcare data collecting. However, prolonged exposures to high-humidity environments usually cause device degradation or failure due to excessive water adsorbed on the sensor surface. In the present work, a graphene film based humidity sensor with a hydrophobic surface and uniformly distributed ring-like wrinkles is designed and fabricated that exhibits excellent performance in breath sensing. The wrinkled morphology of the graphene sensor is able to effectively prevent the aggregation of water microdroplets and thus maximize the evaporation rate. The as-fabricated sensor responds to and recovers from humidity in 12.5 ms, the fastest response of humidity sensors reported so far, yet in a very stable manner. The sensor is fabricated into a mask and successfully applied to monitoring sudden changes in respiratory rate and depth, such as breathing disorder or arrest, as well as subtle changes in humidity level caused by talking, cough and skin evaporation. The sensor can potentially enable long-term daily monitoring of breath and skin evaporation with its ultrafast response and high sensitivity, as well as excellent stability in high-humidity environments.

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Section: Introductionmentioning

confidence: 99%

Formation of Uniform Water Microdroplets on Wrinkled Graphene for Ultrafast Humidity Sensing

Zhen

Zhao

et al. 2018

Small

121

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“…13,[15][16][17][18][19][20][21] In a recent study, 14,22 this theory has been extended to the steady, thermal disequilibrium conditions where the temperature discontinuity exists at the solid-vapour interface. [23][24][25][26] At these conditions, a vapour at a temperature, T V , is exposed to a solid surface at a lower temperature, T S , and a temperature function, y VS , is dened as,…”

Section: The Amount Adsorbed H Td Under the Steady Thermal Disequmentioning

confidence: 99%

“…Therefore, the radius of the liquid-vapour interface of a critical size droplet, R d , is obtained by combining eqn (26) and (19),…”

Section: The Critical Size Dropletsmentioning

confidence: 99%

Initiation of condensation of toluene and octane vapours on a Si surface

Yaghoubian

2020

RSC Adv.

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“…DWC, FWC, or a combination of both can be observed on the heat transfer surface as per operating conditions. Resultant form of condensate depends mainly on the roughness [58], surface orientation [59], and surface tension of condensing fluid [60,61]. Extensive efforts have been made to lower surface energy in order to achieve stable DWC mode for longer periods for real-life applications [62].…”

Section: Optimal Surface Conditioningmentioning

confidence: 99%

Review of Micro–Nanoscale Surface Coatings Application for Sustaining Dropwise Condensation

et al. 2019

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Condensation occurs in most of the heat transfer processes, ranging from cooling of electronics to heat rejection in power plants. Therefore, any improvement in condensation processes will be reflected in the minimization of global energy consumption, reduction in environmental burdens, and development of sustainable systems. The overall heat transfer coefficient of dropwise condensation (DWC) is higher by several times compared to filmwise condensation (FWC), which is the normal mode in industrial condensers. Thus, it is of utmost importance to obtain sustained DWC for better performance. Stability of DWC depends on surface hydrophobicity, surface free energy, condensate liquid surface tension, contact angle hysteresis, and droplet removal. The required properties for DWC may be achieved by micro–nanoscale surface modification. In this survey, micro–nanoscale coatings such as noble metals, ion implantation, rare earth oxides, lubricant-infused surfaces, polymers, nanostructured surfaces, carbon nanotubes, graphene, and porous coatings have been reviewed and discussed. The surface coating methods, applications, and enhancement potential have been compared with respect to the heat transfer ability, durability, and efficiency. Furthermore, limitations and prevailing challenges for condensation enhancement applications have been consolidated to provide future research guidelines.

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The effect of surface wettability on water vapor condensation in nanoscale

Cited by 51 publications

References 28 publications

Formation of Uniform Water Microdroplets on Wrinkled Graphene for Ultrafast Humidity Sensing

Formation of Uniform Water Microdroplets on Wrinkled Graphene for Ultrafast Humidity Sensing

Initiation of condensation of toluene and octane vapours on a Si surface

Review of Micro–Nanoscale Surface Coatings Application for Sustaining Dropwise Condensation

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