Oil-water mixtures are not colloids.
Expanded information:
A colloid, also known as a colloidal dispersion, is a more homogeneous mixture containing two different states of matter in a colloid, a dispersed phase and a continuous phase.
Dispersion of a part of the tiny particles or droplets composed of dispersions of particles in the diameter of 1 ~ 100nm between the dispersion system is a colloid; colloid is a kind of dispersion of particles between the diameter of the coarse dispersion system and the solution of a class of dispersion system, which is a highly dispersed multi-phase inhomogeneous system.
Applications:
1. Agricultural production: the soil's role in retaining fertilizer. Many substances in the soil, such as clay humus, often in the form of colloids.
2. Health care: hemodialysis, serum paper electrophoresis using electrophoresis to separate various amino acids and proteins. Medicine is increasingly using highly dispersed colloids to test or treat diseases, such as colloidal magnetic fluid cancer treatment is made of magnetic substances into colloidal particles, as a carrier of drugs, under the action of the magnetic field will be sent to the focal point of the disease, thereby improving the efficacy of treatment.
3. Daily life: the principle of making tofu, soymilk, milk and porridge (colloidal aggregation and sinking), alum water purification.
4. Natural geography: the formation of deltas at the mouth of rivers, the formation of the principle is the electrolyte in the sea water so that the formation of river sediment colloid polymerization and sinking.
5. Industrial production: the production of colored glass (solid solution). In metals, ceramics, polymers and other materials to add solid colloidal particles, not only can improve the impact strength of the material, fracture resistance, tensile strength and other mechanical properties, but also improve the optical properties of the material.
Colored glass is made of certain colloidal metal oxides dispersed in glass. Some gunpowder and explosives in the defense industry shall be made into colloids. Some of the preparation of nanomaterials, metallurgical industry in the beneficiation, dehydration of crude oil, plastics, rubber and synthetic fibers and other manufacturing processes will use colloids.
6. Wastewater treatment: some of the pollutants in the wastewater is in the form of colloids, so a lot of sewage treatment equipment designed to study how to quickly and efficiently remove the pollutants in the wastewater in the form of colloids.