Water condensation on zinc surfaces treated by chemical bath deposition

Narhe, R. D.; González-Viñas, Wenceslao; Beysens, Daniel

doi:10.1016/j.apsusc.2010.03.004

Cited by 50 publications

(43 citation statements)

References 33 publications

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“…The flux is controlled with a digital fluxmeter and leads to a laminar shear flow over the substrate [23]. (For more details about the procedure, see [24].) The substrates are of ITO-coated glass, supplied by Visiontek Systems Limited (UK), with dimensions of 0.1 × 1.7 × l.8 cm 3 .…”

Section: Experiments and Methodsmentioning

confidence: 99%

Droplet pattern and condensation gradient around a humidity sink

et al. 2014

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We describe the evolution of a water drop saturated with NaCl and the growth of pure water droplets in a breath figure pattern (BF) condensing around it. This salty drop acts as a humidity sink, inhibiting the BF inside a ring at a distance r = δ from the sink center and slowing down BF growth outside the ring. The initial salty drop is taken either from a salt-saturated solution (type I experiment) or by placing an NaCl crystal on the substrate (type II experiment). The results are similar, provided that the initial time for type II evolution is taken at the end of the crystal dissolution. The evolution of the salty drop radius R is deduced from the establishment of a three-dimensional hyperbolic concentration profile around the salty drop. This profile scales with r/δ. Accounting for the salt concentration decrease with salty drop growth, R is seen to grow as t 5 . In the region r > δ, water droplets nucleate and grow. The rate of evolution of the water droplets at constant r/δ can be used to determine the local water pressure. The corresponding data reasonably agree with a hyperbolic water vapor profile around the salty drop. These results can be applied to the growth of BF patterns to determine whether hyperbolic or linear water vapor profiles apply.

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Section: Experiments and Methodsmentioning

confidence: 99%

Droplet pattern and condensation gradient around a humidity sink

et al. 2014

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“…From an industrial perspective, the CuO fabrication method is appealing because it can be applied to arbitrarily shaped surfaces, where the nanostructures form at low temperatures and do not require any high temperature annealing or drying processes. While zinc oxide (ZnO) has also been proposed, Narhe et al 92 showed that the ZnO nanostructures had favorable morphology (Figure 6g-i), but…”

Section: Fabrication Of Scalable Nanostructuresmentioning

confidence: 99%

“…Recently, researchers have proposed metal oxides to fabricate more scalable superhydrophobic nanostructured surfaces 47,85,86,[92][93][94][95][96] . The nanoscale oxide can 1) better satisfy the requirement for the structure density to be larger than the nucleation density in order to avoid flooding 55 , and 2) reduce the structure length scale beneath the droplet in order to minimize the structure thermal resistance 67 .…”

Section: Fabrication Of Scalable Nanostructuresmentioning

confidence: 99%

Condensation heat transfer on superhydrophobic surfaces

2013

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(150 words max)Condensation is a phase change phenomenon often encountered in nature and industry for applications including power generation, thermal management, desalination, and environmental control. For the past eight decades, researchers have focused on creating surfaces allowing condensed droplets to be easily removed by gravity for enhanced heat transfer performance.Recent advancements in nanofabrication have enabled increased control of surface structuring for the development of superhydrophobic surfaces with even higher droplet mobility, and in some cases, coalescence-induced droplet jumping. Here, we provide a review of new insights gained to tailor superhydrophobic surfaces for enhanced condensation heat transfer considering the role of surface structure, nucleation density, droplet morphology, and droplet dynamics.Furthermore, we identify challenges and new opportunities to advance these surfaces for broad implementation into thermo-fluidic systems.

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“…The experimental procedure is the same as already described elsewhere [9], except that the substrate here is driven to a lower temperature. A clean substrate is fixed on a horizontal electrolytic copper plate in the condensation chamber.…”

mentioning

confidence: 99%

Percolation-induced frost formation

Guadarrama-Cetina¹,

Mongruel²,

González-Viñas³

et al. 2013

EPL

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-We report the observation of an unconventional mechanism for frost formation. On a smooth hydrophobic surface cooled much below the water freezing temperature (−9• C), we find that, instead of the classical freezing of individual supercooled condensed droplets, frost can occur through a multi-step 2-dimensional percolation-driven mechanism. This in-plane propagation process provides a model to investigate more complex bulk phase transformations such as those occurring in atmospheric supercooled clouds. It can also lead to a new method to control and design in-plane solidification at a nanoscale level.

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Water condensation on zinc surfaces treated by chemical bath deposition

Cited by 50 publications

References 33 publications

Droplet pattern and condensation gradient around a humidity sink

Droplet pattern and condensation gradient around a humidity sink

Condensation heat transfer on superhydrophobic surfaces

Percolation-induced frost formation

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