Materials required
Iron nitrate, Citric acid, Ammonium dichromate, copper
sulphate, stearic acid, poly vinyl chloride (PVC), tetra hydrofuron
(THF), etc. are of purified grade obtained from Merck Chemicals,
India. These chemicals are used as such without any further
purification. Amongst the reagents, copper stearate possesses
lower surface energy, metal oxide nanoparticles such as Fe2O3 and
Cr2O3 provide roughness and PVC acts as a binder. 100% cotton
fabric, readily available in the marketis uniformly cutinto pieces of
2 cm 2 cm and thoroughly cleaned by immersing in distilled
water to remove dust or any other impurities.