Evaporation Kinetics of Sessile Water Droplets on Micropillared Superhydrophobic Surfaces

Langmuir ◽  
2013 ◽  
Vol 29 (20) ◽  
pp. 6032-6041 ◽  
Author(s):  
Wei Xu ◽  
Rajesh Leeladhar ◽  
Yong Tae Kang ◽  
Chang-Hwan Choi
Keyword(s):  
Superhydrophobic Surfaces ◽  
Water Droplets ◽  
Kinetics Of ◽  
Evaporation Kinetics

Effects of Surface Topography and Colloid Particles on the Evaporation Kinetics of Sessile Droplets on Superhydrophobic Surfaces

2012 ◽  
Vol 134 (5) ◽  
Author(s):  
Wei Xu ◽  
Chang-Hwan Choi
Keyword(s):  
Rate Constants ◽  
Water Droplet ◽  
Evaporation Rate ◽  
Pure Water ◽  
Hydrophobic Surface ◽  
Superhydrophobic Surfaces ◽  
Clear Correlation ◽  
Planar Surface ◽  
Kinetics Of ◽  
Evaporation Kinetics

In this paper, the evaporation kinetics of microliter-sized sessile droplets of gold colloids (∼250 nm in particle diameters) was experimentally studied on micropatterned superhydrophobic surfaces, compared with those of pure water on a planar hydrophobic surface. The structural microtopography of superhydrophobic surfaces was designed to have a constant air fraction (∼0.8) but varying array patterns including pillars, lines, and wells. During evaporation in a room condition, the superhydrophobic surfaces exhibited a stronger pinning effect than a planar surface, especially in the initial evaporation stage, with significant variations by the surface topographies. Compared to a pure water droplet, colloids exhibited further promoted pinning effects, mainly in the later stage of evaporation. While the well-known evaporative mass transport law of sessile droplets (i.e., linear law of “V2/3∝t”) was generally applicable to the superhydrophobic surfaces, much smaller evaporation rate constants were measured on the patterned superhydrophobic surfaces than on a planar hydrophobic surface. A colloidal droplet further showed lower evaporation rate constants than a pure water droplet as the concentration of particles in the droplets increased over the evaporation. Such transition was more dramatic on a planar surface than on the micropatterned surfaces. Whereas there was no clear correlation between evaporation mode and the evaporation rate observed on the superhydrophobic surfaces, the prominent decrease of the evaporation rate on the planar hydrophobic surface was accompanied with the onset of a second pinning mode.

scholarly journals The evaporation kinetics of pure water droplets at varying drying rates and the use of evaporation rates to infer the gas phase relative humidity

2018 ◽  
Vol 20 (36) ◽  
pp. 23453-23466 ◽  
Author(s):  
Yong-yang Su ◽  
Rachael E. H. Miles ◽  
Zhi-ming Li ◽  
Jonathan P. Reid ◽  
Jiang Xu
Keyword(s):  
Relative Humidity ◽  
Gas Phase ◽  
Aerosol Particles ◽  
Pure Water ◽  
Analytical Models ◽  
Volatile Components ◽  
Water Droplets ◽  
Drying Rates ◽  
Kinetics Of ◽  
Evaporation Kinetics

Numerous analytical models have been applied to describe the evaporation/condensation kinetics of volatile components from aerosol particles for use in many applications.

Nanofluids Evaporation Kinetics on Microstructured Superhydrophobic Surfaces

2009 ◽  
Author(s):  
Wei Xu ◽  
Chang-Hwan Choi
Keyword(s):  
Contact Angle ◽  
Evaporation Rate ◽  
Superhydrophobic Surfaces ◽  
Wetting Transition ◽  
Initial Contact ◽  
Deep Reactive Ion Etching ◽  
Surface Patterns ◽  
Teflon Coating ◽  
Kinetics Of ◽  
Evaporation Kinetics

In this paper, we experimentally studied the evaporation kinetics of sessile droplets of nanofluids with systematically varying particle sizes on superhydrophobic surfaces of well-defined micro-post structures. The superhydrophobic surface patterns were fabricated on a silicon wafer by photolithography and deep reactive ion etching (DRIE) at cryogenic temperature followed by Teflon coating. The 0.01 wt% suspensions of gold (Au) nanoparticles with varying sizes (5, 50, and 250 nm in diameter) were tested as nanofluids for the evaporation kinetics including the contact angle, base diameter, height, volume and evaporation rate by using a goniometer. The dryout patterns were investigated by using scanning electron microscopy (SEM). The results show that the surface topography and nanoparticle sizes have significant effects on the initial contact angle, profile evolution, wetting transition, evaporation rate, and dryout deposition pattern of the nanofluid droplets.

scholarly journals Study of the Contact and the Evaporation Kinetics of a Thin Water Liquid Bridge between Two Hydrophobic Plates

2017 ◽  
Vol 07 (04) ◽  
pp. 99-112 ◽  
Author(s):  
Etienne Portuguez ◽  
Arnaud Alzina ◽  
Philippe Michaud ◽  
Djamila Hourlier ◽  
Agnès Smith
Keyword(s):  
Liquid Bridge ◽  
Kinetics Of ◽  
Evaporation Kinetics

scholarly journals One-step fabrication of soft calcium superhydrophobic surfaces by a simple electrodeposition process

RSC Advances ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 297-308
Author(s):  
Zhi Chen ◽  
Yongbo Hu ◽  
Xu He ◽  
Yihao Xu ◽  
Xuesong Liu ◽  
...  
Keyword(s):  
Formation Process ◽  
Superhydrophobic Surface ◽  
Surface Preparation ◽  
Superhydrophobic Surfaces ◽  
Water Droplets ◽  
Step Method ◽  
Electrodeposition Process ◽  
Pressing Force ◽  
One Step

We investigated a one-step method for calcium superhydrophobic surface preparation and researched the formation process of loose, flower-like microstructures. Also, we found that the pressing force strongly impacts the dynamics of water droplets.

Sensitivity of mixed cation/halide perovskites to evaporation kinetics of DMSO at early stage

2021 ◽  
Author(s):  
GYUMIN KIM ◽  
Eun Seo Oh ◽  
Ajay Kumar Jena ◽  
Tsutomu Miyasaka
Keyword(s):  
Solar Cells ◽  
High Performance ◽  
Early Stage ◽  
Perovskite Solar Cells ◽  
Inorganic Hybrid ◽  
Hybrid Perovskite ◽  
Annealing Step ◽  
Halide Perovskites ◽  
Kinetics Of ◽  
Evaporation Kinetics

Controlling the evaporation kinetics of the perovskite precursor (EKP) during the thermal annealing step of organic–inorganic hybrid perovskite solar cells (OIHPs) is important for achieving high performance. Although regulation of...

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