The separation of colloidal particles (or purification of sol) from particles of molecular dimensionsis known as

The separation of colloidal particles from particles of molecular dimensions is known as ultrafiltration. This process utilizes a semipermeable membrane to allow smaller molecules to pass through while retaining larger colloidal particles. Ultrafiltration is commonly used in various applications, including water purification, food processing, and biotechnology.

In this method, the membrane acts as a barrier that separates substances based on size, enabling the concentration of colloidal materials and the removal of dissolved salts and low molecular weight substances. This technique is efficient for purifying colloidal solutions, producing high-quality filtrates, and concentrating valuable biological products from mixtures.