Definition of Sol and Gel Difference between Sol and Gel

Gel Open Categories: Food, Experimental, Industrial, Definition, Physicochemical Gel is also known as gel. Colloidal particles or polymers in sol or solution are connected to each other under certain conditions to form a spatial network structure, and the structural voids are filled with liquid (which can also be gas in dry gels) as a dispersion medium, and such a special dispersion system is called gel.

There is no liquidity. The inside often contains a large amount of liquid. For example, the water content of blood gel and agar can reach more than 99%.

It can be divided into elastic gel and brittle gel. The volume of the elastomeric gel shrinks significantly when it loses its dispersion medium, and when it is reabsorbed into the dispersion medium, it expands again, e.g. gelatin. When the brittle gel loses or reabsorbs the dispersion medium, the shape and volume do not change, such as silica gel.

The process by which a gel is formed from a solution or sol is called gelation. Gels are mixtures with particle sizes between 1 angstrom and 10 angstroms. Polymer solutions and certain sols, under the right conditions, the whole system will be transformed into an elastic, semi-solid state of thick substance, loss of fluidity.

This phenomenon is called gelling, and the resulting product is called gel or gel.

Colloid chemistry is the science of dispersion of these tiny particles (colloidal particles) in a narrow sense, usually specifying the diameter of colloidal particles from 1 to 100 nm (some people advocate 1 to 1000 nm). The dispersion of dispersed phase particles with a diameter of 1-100nm in the dispersion medium, and there is an obvious physical interface between the dispersed phase particles and the dispersion medium is called a colloidal dispersion system. It is customary to refer to colloidal dispersion systems in which the dispersion medium is liquid as liquid or sol (SOL); When the medium is solid, it is called a solid sol.

1. The meaning is different.

Sols are colloidal particles with a diameter size of 1-100 nm (1-1000 nm is also claimed). And the dispersed phase particles with a diameter of 1-100nm are evenly distributed in the dispersed matter in the dispersion medium. Sol is a heterogeneous dispersion system, insoluble in the medium, with obvious phase interface, and is a hydrophobic colloid.

The colloidal particles or polymers in the sol or solution are connected to each other under certain conditions to form a spatial network structure, and the structural void is filled with a liquid (in the dry gel it can also be a gas, the dry gel is also called aerogel), and such a special dispersion system is called a gel.

2. The characteristics are different.

The gel has no fluidity. The inside often contains a large amount of liquid. For example, the water content of blood gel and agar can reach more than 99%.

It can be divided into elastic gel and brittle gel. After the elastic gel loses the dispersion medium, the volume shrinks significantly, and when the dispersion medium is reabsorbed, the volume expands again, such as gelatin.

The sol is unstable, and the colloidal particles have a tendency to automatically condense and become larger, and after being placed for a long time, they will also precipitate, but they have a certain stability in a short time.

The difference between cementitious materials and adhesives: The difference between cementitious materials and adhesives is as follows: Lee's cementitious materials, that is, cementitious materials, refer to substances that can change from a slurry to a solid stone body and cement other materials and have a certain strength under physical and chemical action. A class of natural or synthetic, organic or inorganic substances that connect two or more parts or materials together is called adhesive and is customarily called glue.