adsorbents properties of colloids

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..

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

Catalytic activity The activity of a catalyst depends on the strength of chemisorption. To be active, the surface of the catalyst should be extensively covered by the adsorbate, that is, the chemisorption should be strong. However, if the strength of the adsorbent-adsorb..

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..

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 particles of a sol either carry positive or negative charge. Sols in, which the colloidal particles carry positive charge are called positive sols. When colloidal particles carry negative charge, the sols are called negative sols. The existence of charge on t..

When a strong beam of light is passed through a colloidal solution, the path of the light becomes visible when viewed from a direction at right angle to that of the incident light. This occurs because the colloidal particles absorb light energy and then scatter it in all directi..

. Colloidal system are classified in three ways depending on: i) Physical states of the dispersed phase and dispersion medium nature of interaction between the dispersed phase and the dispersion medium. ii) Colloidal systems exhibit their characteristic optical, mechanical and e..