Dear/dr
this paper will help to answer the question.
Dear Dr. Duraid,
Silica fume is on type of nano materials which used to improve properties of concrete. Please Watch "microsilica production" on YouTube
https://youtu.be/mIGiGidq_Tg
REGARDS
So, You can see that the micro silica is a waste materials produced from production of silicon.
REGARDS
Dear bro even I am not specialist in this field but you can go through this link to get huge no. of researches
https://www.google.com/search?client=opera&q=nano+fertilizers+or+how+any+chemical+nano+material+producing+exactly.pdf&sourceid=opera&ie=UTF-8&oe=UTF-8
Zeolite (Clinoptilolite) was made nano sized particles with ball mill. 1 g of this was taken in a centrifuge and stirred with 1.5M 50 ml of calcium sulphate solution for 8 hours, filtered and washed with de-ionized water, air dried. Solid: liquid ratio was maintained up to 1: 10 for synthesis purpose. Nitrogen fertilizers are very important but due to its highsolubility nature it causes severe damage to the pants and the surroundings therefore a nano porous zeolite was used with urea and there was considerable increase in the uptake of nitrogen efficient urea with controlled release. Aluminium zeolites are also used because they are highly porous and allow the retention of the soil. These zeolites help the dry soil also to retain all the moisture content and help to grab nutrients from the soil.
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