optical properties of colloids

Although a colloidal solution appears to be homogenous because the dispersed particles are too small too be seen, it can be distinguished from a true solution by its ability to scatter light. The scattering of light by colloidal sized particles is called the Tyndall effect. Thi..

Colloidal sols are biphasic in nature. It consists of the dispersed phase and the dispersion medium. In the colloidal solution, each particle is contained within its own surface boundary and therefore has a separate existence from the dispersion mediu..

Brownian movement When a colloidal solution is viewed through a powerful microscope, the colloidal particles can be seen moving in a random zig-zag path. This zig-zag motion of colloidal particles is called Brownian movement. This random motion is due to c..

) Low transmission losses, as low as 0.1 db/km. (iii) Immunity to electromagnetic interference, which is an inherent characteristic of an optical fiber viewed as a dielectric wave guide. (iv) Small size and weight, characterized by a diameter, which is no greater than that of a human hair..

50% Anti-corrosion agent 6% Optical brightener 0.3% Water and inorganic filler 19.7% Tripolyphosphate can produce hydroxyl ions by reacting with water. It keeps the wash water slightly alkaline, to emulsify grease particles. They can also tie up calcium and magnes..

Wave Optics - Introduction - The branch of physics dealing with the study of optical phenomena is called optics. This can be divided into two categories, ray optics and wave optics. Wave optics describes the connection between waves and ra..

Property True Solutions Suspensions Colloidal Solutions Particle size Less than 10 - 7 cm Greater than 10 -5 c m Between 10 - 5 and 10 - 7 cm Visibility of particles Invisible to naked eye not visible under powerful microscope Easily visible Invisibl..

Colloidal particles have high average molecular masses. Therefore the mole fraction of the dispersed phase is very low. Hence, in colloidal solutions the relative lowering of vapor pressure, elevation in boiling point, depression in freezing point and osmotic pressure is very l..

When colloidal solutions have been observed through ultra microscope, the colloidal particles are seen in constant and rapid zigzag motion called Brownian movement. Sir Robert Brown first observed the phenomenon in 1827. Suspensions and true solutions do not exhibit Brownian mov..