| Message: | Serum separation gel is composed of hydrophobic organic compounds and silica powder. It is a thixotropic mucus colloid. Its structure contains a large number of hydrogen bonds. Due to the association of hydrogen bonds, a network structure is formed. Under the action of centrifugal force, the network structure is It becomes a low-viscosity fluid when it is destroyed, and then re-forms a network structure after the centrifugal force disappears. This property is called thizotropy. That is, when the temperature does not change, a certain mechanical force is applied to this mucus colloid, which can change from a high-viscosity gel state to a low-viscosity sol state. If the mechanical force disappears, it will return to the original high-viscosity gel state. The interconversion between gel and sol produced by mechanical force was first named by Freundlich and Petrifi. Why does the interaction of gel and sol occur due to the action of mechanical force?
The thixotropy is because the structure of the separation gel contains a large amount of hydrogen bond network structure. At room temperature, hydrogen bonds are more likely to be severed and cause recombination. Silica has silicic hydroxyl groups (SiOH) on the surface to form SiO molecular aggregates (primary particles). The primary particles are linked by hydrogen bonds to form chain-like bonded particles. The chain-like silica particles and the particles of the hydrophobic organic compound constituting the separation gel further form hydrogen bonds to generate a network structure, forming gel-like molecules with thixotropy.
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