Synthesis of nanomaterials using precipitation method. Example synthesis of Copper Oxide (CuO) nanoparticles

1. Synthesis of Nanomaterials
Precipitation Process

2. What are Nanomaterials ?
Nano Materials are usually considered to be materials with at
least one external dimension less than 100 nanometers (10-9)
What is a precipitate !
A precipitate is a substance that is deposited in solid
form from a solution
What is this precipitation process ?
This method relies on the precipitation of nanometer sized-
particles within a continuous fluid solvent.

3. Synthesis of CuO nanoparticles :
 55g of copper sulphate pentahydrate (CuSO4 . 5H2O) is mixed with
25g of hydroxyl ammonium chloride (NH2OH . HCl) in 125mL of
distilled water.
 The mixture is cooled in a cold water bath with constant swirling.
 A solution containing 40g of sodium hydroxide (NaOH) in 750mL of
distilled water is added to the mixture.
 The ppt. is settled down and the supernatant liquid is poured off.
 The ppt is washed several times with distilled water until it is chloride
free
 The ppt is dried at 200-2500C.
 When the ppt is heated to 3000C, CuO is formed.

4. How does this work !
Precipitation Process :
B
…………………
………
C
ppt
A
Reaction
Filter
===
===
==
Drying
Solutions
Product
2CuSO4
2NH2OH . HCl
Cold Water Bath
NaOH
The ppt is dried at
200-2500C.

5. Lets look into the Reaction Equation :
2CuSO4 + 2NH2OH . HCl + 6NaOH
Cu2O +N2 + 2Na2S04 + 7H2O + 2NaCl
Cu2O ------------------------------------------>
CuO + Cu

6. Advantages :
The method is relatively simple and widely
used for the production of single and multi
components oxide nanopowders .
Easy contol of particle size
Good contol on composition of nano
particle
Various possiblities to modify the particle
surface and homogenity.

7. ThankYou
Done by,
@tejas,s,u_
Contact: tejas.s.u.coorg@gmail.com