Wednesday, July 29, 2009

how shampoo act on your hair


























Would you like to know about the reaction which happen during the hair washing?



shampoo means removal of dirt,oil,sebum and product buid up from your hair such as dandruff.



The cleaning agent in shampoo is called a surfactant,which have hydrophilic end and hydrophobic end.The hydrophilic end is attached to water and hydrophobic end is attached to oils.They also act as a bridge between the oil and water molecule.So it act as soap and has polar and non polar structure.



A drop or two of shampoo in water forms a monolayer on the water surface,as shown in the picture,The shampoo molecules "stand up" on the surface as the polar end is attracted to the polar water. The non-polar hydrocarbon tails are repelled by the water,which makes them appear to stand up.p



water alone is not able to penetrate in oil because they have opposite polarity.The surface of each oil droplet is negatively charged. As a result, the oil droplets repel each other and remain suspended in solution (this is called an emulsion) to be washed away by water.

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