Colloidal particles are found in colloidal
silver and are larger than molecules but too small to be observed directly with a microscope; however, their shape and size can be determined by electron microscopy.In a true solution the particles of dissolved substance are of molecular size and are thus smaller than colloidal particles; in a coarse mixture such as a suspension, the particles are much larger than colloidal particles. Although there are no precise boundaries of size between the particles in mixtures, colloids, or solutions like colloidal gold and colloidal silver, colloidal particles are usually on the order of 10-7 to 10-5 cm in size.
In 1861 Thomas Graham coined the term colloid (which means “glue” in Greek) while studying a certain kind of solutions. His idea of using the term was to emphasize their low rate of diffusion and lack of crystallinity. Graham deduced that the low rate of diffusion implied that the particles were fairly large – at least 1nm in diameter in modern terms. On the other hand, the failure of particle sedimentation implied an upper size limit of 1 micrometer. Depending on the manufacturer, colloidal silver can have large or very small colloidal particles. Graham’s definition of the range of colloidal particle sizes that characterize the colloidal domain is still widely used today.
Today colloidal science is the study of systems involving small particles of one substance suspended in another. Suspensions in liquids form the basis of a wide variety of systems of scientific and technological importance, including paints, ceramics, cosmetics, agricultural, medical, supplemental, sprays, detergents, soils, biological cells, colloidal silver, gold and many food combining recipes.
Almost every technique and theoretical procedure of modern physics and chemistry has been and is being applied to the study of colloids so that even the specialist colloid chemist finds it difficult to keep pace with the many ramifications of the subject. Colloidal silver is one of the most studied of the colloids.
Colloidal silver and true colloidal have fine particles of this system, each carry a negative charge and therefore repel each other. The force of gravity is the force of attraction tending to bring them together. A unique balance of these charges and forces is what keeps the particles suspended uniformly throughout the medium resulting in a stable colloidal system. Much of the chemistry of the human body is colloidal and supported by colloidal systems. Every colloidal system possesses certain electrical and vibrational qualities. This is the critical factor that makes it function in a particular way as it runs through the cells in the body. A colloidal system may consist of one kind of colloid or a combination of solid, liquid or gas colloids dispersed in the medium.
Colloidal minerals are almost always brought into the subject when discussing colloid. There are 75 trace elements of colloidal minerals.