Water is an essential component for human survival. The fact that human civilization started at riversides proves this point. However, private and public agencies warn about possible future conflicts regarding water. Even at this moment, parts of the world are suffering from waterborne epidemics. St...
Water is an essential component for human survival. The fact that human civilization started at riversides proves this point. However, private and public agencies warn about possible future conflicts regarding water. Even at this moment, parts of the world are suffering from waterborne epidemics. Studies regarding water problems, however, are not being actively carried out. Among the few researches, typical studies are seawater desalination and rain storage systems. These studies, however, have high plant and equipment investment costs and weather dependency, and as such less weather dependent projects that are easier to implement are necessary.
This paper presents research on obtaining drinking water from atmospheric condensation. In order to efficiently obtain drinking water, a droplet condensing surface that is sustainable for a long period of time and a micro-structured superhydrophobic surface are required. However, research on droplet condensation on a superhydrophobis surface is still at an infancy stage, and a method to quantitatively measure the variation of the surface property has yet to be develpoed. This research observed and analyzed the growth mechanism of droplet formation through artificial condensation on a micro-structured superhydrophobic surface.
Analysis of a droplet’s movement was conducted on micro-structured superhydrophobic surfaces through various measurements. By measuring the surface adhesive force before and after the condensation, we quantitatively measured the wetting property of the superhydrophobic surface and analyzed the movement of the water droplet with ESEM and a microscope. The initial movement was observed with ESEM and the remaining the movement was observed with a microscope. From the adhesive surface property test, on a surface with a 1 μm micro-structure at 3 μm intervals, the surface has surface adhesive force hysteresis of 0.0652mN and 0.0262mNm, the best property attained in this study. We observed that in the process of droplet growth, a liquid bridge formed when two or more droplets merge and had a small contact surface, as determined by ESEM measurements. Also, microscope observations revealed active formation, growth, drainage, and reformation of the droplet. Droplet condensation was sustained continuously.
The application potential was evaluated according to the amount of cumulated water on the superhydrophobic surface with a 1 μm micro structure at 3 μm intervals. Under the conditions of atmospheric temperature of 20 ℃ and humidity of 60~70%, the surface cumulated 93 mg/cm2 of water, which is twofold greater than that of other surfaces. This result means that a 1m2 surface will supply 7.6 liters of water per day, or 310 ml per hour. Assessments like this will help design atmosphere based water supply systems.
In this research we observed formation, growth, drainage, and reformation of a droplet on a superhydrophobic surface. A design standard for a droplet forming surface was suggested, and a method to measure the properties of a condensation-forming surface was confirmed. It could be applicable to drinking water supplying systems. Furthermore, we anticipate that superhydrophobic surfaces with a nano-structure will have better performance.
Water is an essential component for human survival. The fact that human civilization started at riversides proves this point. However, private and public agencies warn about possible future conflicts regarding water. Even at this moment, parts of the world are suffering from waterborne epidemics. Studies regarding water problems, however, are not being actively carried out. Among the few researches, typical studies are seawater desalination and rain storage systems. These studies, however, have high plant and equipment investment costs and weather dependency, and as such less weather dependent projects that are easier to implement are necessary.
This paper presents research on obtaining drinking water from atmospheric condensation. In order to efficiently obtain drinking water, a droplet condensing surface that is sustainable for a long period of time and a micro-structured superhydrophobic surface are required. However, research on droplet condensation on a superhydrophobis surface is still at an infancy stage, and a method to quantitatively measure the variation of the surface property has yet to be develpoed. This research observed and analyzed the growth mechanism of droplet formation through artificial condensation on a micro-structured superhydrophobic surface.
Analysis of a droplet’s movement was conducted on micro-structured superhydrophobic surfaces through various measurements. By measuring the surface adhesive force before and after the condensation, we quantitatively measured the wetting property of the superhydrophobic surface and analyzed the movement of the water droplet with ESEM and a microscope. The initial movement was observed with ESEM and the remaining the movement was observed with a microscope. From the adhesive surface property test, on a surface with a 1 μm micro-structure at 3 μm intervals, the surface has surface adhesive force hysteresis of 0.0652mN and 0.0262mNm, the best property attained in this study. We observed that in the process of droplet growth, a liquid bridge formed when two or more droplets merge and had a small contact surface, as determined by ESEM measurements. Also, microscope observations revealed active formation, growth, drainage, and reformation of the droplet. Droplet condensation was sustained continuously.
The application potential was evaluated according to the amount of cumulated water on the superhydrophobic surface with a 1 μm micro structure at 3 μm intervals. Under the conditions of atmospheric temperature of 20 ℃ and humidity of 60~70%, the surface cumulated 93 mg/cm2 of water, which is twofold greater than that of other surfaces. This result means that a 1m2 surface will supply 7.6 liters of water per day, or 310 ml per hour. Assessments like this will help design atmosphere based water supply systems.
In this research we observed formation, growth, drainage, and reformation of a droplet on a superhydrophobic surface. A design standard for a droplet forming surface was suggested, and a method to measure the properties of a condensation-forming surface was confirmed. It could be applicable to drinking water supplying systems. Furthermore, we anticipate that superhydrophobic surfaces with a nano-structure will have better performance.
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