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What are the four major effects of nano-materials and their practical meanings? 10 1. surface effect refers to the change in properties caused by the sharp increase of the ratio of nano-particle surface atoms to total atomic numbers with the smaller particle size.Table 9-2 The relationship between the size of nanoparticles and the number of atoms on the surface is given.With the decrease of particle size,The number of atoms on the surface increases rapidly.In addition,With the reduction of particle size,The surface area and surface energy of nanoparticles are rapidly increasing.This is mainly the smaller the particle size,The more atoms are on the surface.The crystal field environment and binding energy of surface atoms are different from those of internal atoms.There is a lack of adjacent atoms around the surface atoms,There are many dangling keys,With unsaturated properties,It's easy for other atoms to settle down if they want to combine,Therefore, it shows great
What kind of material does filter cotton have? There's too much material in the air,Especially dust,It is mainly formed by a large amount of dust particles,People take a lot of oxygen every day,And the oxygen in the air contains all kinds of dust,In this environment,In addition to absorbing oxygen, people also absorb a lot of dust,With the increase of time,When it reaches a certain number, it can cause diseases,Over time, normal breathing function will be lost.People are now seen wearing masks everywhere,Because the mask is also one of the filter cotton,It filters out the dust in the air,To ensure the cleanliness of the air,Prevention of disease.Filter cotton is indispensable in life,Many places require cleanliness and hygiene,Then these environments must filter out the dust in their location with filter cotton,Only to meet the requirements of clean and closed,All the operations of production can be implemented.What kind of material can filter cotton generally use?First,It's synthetic fiber,It has good insula