How to increase the redispersion effect of pigment surface area?

It should be pointed out that for a certain amount of substances, if they are subdivided (such as pulverized) into finer ones, the surface activity of the surface area is very considerable. For example, suppose there is a solid cube with a side length of one centimeter, and its initial area is six centimeters (one centimeter per side, six sides in total), if the cube is divided into smaller cubes, each The side of a cube is L cm, then the number of this smaller cube is 1/L³. Its area is 6L²cm2, and the total area of all these small cubes is equal to 6L, namely:

Since the initial area of the cube is six original meters 3 , after redistribution (dispersion), 1/L of the total surface area—(6/L)/6=1/L is increased. As a general rule, after a particle is redispersed (dispersed), the increase in new surface area is inversely proportional to some property that reduces the linear range of the particle.

Characteristic linear range of surface area multiples = constant

For example, when a rough spherical particle is dispersed (dispersed) to 1/10 of its original diameter, its surface area is 10 times that of the original. When the dispersion (dispersion ) is 1/1000, its surface area is 1000 times that of the original, and so on.

According to the discussion in the main statement, we can establish a surface tension due to the unbalanced state of force acting on the surface molecules (internal gravity and non-relatively balanced external gravity). Therefore, a relatively broad concept can also be formed, that is, every kind of substance has gravitational force, so that it has an inward pulling force on the surface layer of any substance. We can imagine that if a pure substance is put into a vacuum space, the gravitational force of the substance can only be limited within its own molecules. But if this substance is put into the atmosphere containing O2, N2 and water (wet) or mixed with other substances, the inward gravitational force of the substance will naturally increase and the molecules of these other substances will hug each other. The result is an external gravitational force on the surface of the substance. From these points of view, it can be seen that in a certain environment, the surface or interface of most substances is highly disordered. so. The heterogeneous mixing of molecules will compete for position on the surface of the material and in the process will form a molecular orientation layer at the interface with sufficient attraction to the boundary layer.

For example, glass ages due to water that can form an ultra-thin layer of several molecules (depending on relative humidity) on the surface when left at normal room temperature. This absorption of the water film is evidenced by the reaction of methylglobulinasilane vapor with the absorbed water to render the glass surface water-resistant (due to the protrusion of the methyl groups from the surface). Because completely dry glass (dried under vacuum) does not have good water resistance even after treatment with methylaziasilane vapor.

From this simple example it can be estimated that the molecules on the surface of the pigment particle are different from the pigment particle itself. It can be said that the surface of most pigments is more or less covered or wrapped by oxygen and water absorbed from the air or salts adhered after washing during the pigment manufacturing process. Therefore, after the pigment is surface-treated with another substance (molecule), its surface characteristics and dispersibility are completely different from the original properties of the pigment.