Colloids

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Colloids :

Colloids

Contents:

Contents Introduction Properties 1. Brownian movement Theme of the property Application of the property 2.Tyndall effect Theme of the property Application of the property Conclusion

Introduction:

Introduction A colloid is a substance microscopically dispersed evenly throughout another substance. A colloidal system consists of two separate phases dispersed phase continuous phase A colloidal system may be solid, liquid, or gaseous

1.Brownian movement :

Colloidal particles present in colloidal solution exhibit a very important property called Brownian movement. When a colloidal solution is viewed under an ultra microscope, the colloidal particles are seen continuously moving in a zigzag path 1.Brownian movement

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The property was discovered by a botanist Robert Brown in 1827, when he observed that pollen grains suspended in water exhibit random zigzag motion After the name of the discoverer, the property was named as Brownian movement. It may be defined as follows.

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The continuous zigzag movement of the colloidal particles in the dispersion medium in a colloidal solution is called Brownian movement. (a) Brownian movement (b) Unequal bombardments of the molecules of dispersion medium on a colloidal particle.

Cause of Brownian movement:

Cause of Brownian movement Brownian movement is due to the unequal bombardments of the moving molecules of dispersion medium on colloidal particles. The moving molecules of the dispersion medium continuously attack on colloidal particles from all sides and impart momentum to them. The Brownian movement decreases with an increase in the size of colloidal particle

Application of the property:

Application of the property Brownian Motion in Medical Imaging Brownian Motion In Robotics Brownian Motion in the Stock Market Brownian Motion in Manufacturing Brownian Motion in Decision Making Brownian Motion of Aerosol Particles

Conclusion :

Conclusion The Brownian motion theory has come a long way since its humble beginnings in the nineteenth century, and there now exists a large number of applications Hence, Brownian motion will remain a strong research area in the coming days, and it is certainly not going to become obsolete in the scientific world

Tyndall Effect:

Tyndall Effect When an intense converging beam of light is passed through a colloidal solution kept in dark, the path of the beam gets illuminated with a bluish light. This phenomenon is called Tyndall effect and the illuminated path is known as Tyndall cone The Tyndall effect is due to the scattering of light by colloidal particles.

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phenomenon was first observed by Tyndall in 1869. The Tyndall effect is due to the scattering of light by colloidal particles

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This is because the particles (ions or molecules) present in a true solution are too small to scatter light. Thus, Tyndall effect can be used to distinguish a colloidal solution from a true solution The phenomenon has also been used to devise an instrument known as ultra microscope The instrument is used for the detection of the particles of colloidal dimensions.

Formation of blue sky:

Formation of blue sky The sky is the empty space around earth and as such has no colour. It appears blue due to the scattering of light by the colloidal dust particles present in air (Tyndall effect).

presented by Divya Sudanagunta:

presented by Divya Sudanagunta Thank u

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