What is lotus effect?
Wettability changes according to shape of surface as well.
Lotus leaf is one of the examples. Water which dropped on surface of lotus leaf become droplets by shaping like a sphere and catches dirt while it rolls down, so that surface of lotus leaf never gets wet. Droplet on surface of leaf catches dirt, dust, bugs, etc. which is sticked to surface of the leaf while it rolls down, therefore, lotus leaves are always kept clean.
This water-repellent self-cleaning action is called lotus effect.
Lotus root is lotus stalk grow in mud. Leafstalk prolongs from lotus root which is in mud and the leafstalk grows above water surface, then connected to lotus leaf. There are small halls on lotus leaf and these holes are connected to holes of lotus root buried in mud via cavity of leafstalk. Lotus root cannot breathe since it is in mud. Lotus root gets oxygen through lotus leaf and cavity of leafstalk, so that it can breathe. Therefore, lotus root cannot breathe if small holes on lotus leaf are filled with dirt, etc. Lotus cannot live if surface of lotus leaf gets dirty so it must keep its leaf always clean.
Then, why lotus leaf does not get wet? The reason is in structure of leaf surface.
Normally, leaf of plants has certain degree of water-repellency since it has wax on its surface, however, lotus leaf also has minute protrusions and recesses on the waxed surface. Water-repellent structure having fine irregularity is added to the original water repellent waxed surface, so that the surface becomes super water-repellent.
Because of this water-repellency, surface of leaf doesn’t get wet and does perform self-cleaning action by forming droplets and catching dusts while the droplets are falling down, therefore, surface of leaf doesn’t get wet and is kept clean.
Lotus effect is a term of materials engineering which suggests self-cleaning action seen in the Nelumbonaceae plants. This natural self-cleaning function was found by botanists who studied lotus leaves.
In field of nano-technology, lotus effect is applied to surface of paints, roofing, clothes, etc. and method to keep materials dry and clean is being developed. The same effect can be obtained by surface finishing with fluorine compound and silicone, and also by mixing glucose or sucrose into polyethylene glycol.
Today, we can get paints with this self-cleaning function, or glass plate for greenhouse roof having lotus effect, etc. at a market.
Droplet on lotus leaf
Surface of lotus leaf
Structural computer graphics
Surface of taro leaf, lotus effect
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|Initial, running and maintenance costs are low because of its simple structure based on internationally patented technology.|
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|For raw material slurry drying, laborious works of manual operation will be decreased significantly by replacing box shaped compartment tray dryer with our dryer|
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