Any material that is reasonably insoluble in the dispersion medium can be caused to form a colloidal dispersion. 难溶于分数介质的任何物质都能够形成一种胶体分散体。
The dispersion coefficient of colloids and the distribution coefficient for radionuclides with colloids are also considered as they pertain to the size of the colloid. 胶体的颗粒大小分布,在自然界中,并不是均匀分布的单分散性的胶体,而是不同颗粒尺寸组合的多分散性胶体。