2.2 Synthesis of nickel ferrite on silica substrate
(NiFe2O4@SiO2)
The synthesis method of magnetic nickel ferrite nanocomposite on a
silica substrate is in accordance with the Gharagozlou M. et.al. method
reported in the sources [25]. Nickel ferrite has weight ratios of
10, 30, and 50 percent to the 90, 70 and 50 weight percent of silica
substrate respectively.
In this method, the nickel nitrate and iron nitrate were weighed in the
amount of 6 and 9 grams respectively, and dissolved in 10 ml of
deionized water under reflux conditions and stir well with a mechanical
mixer for 30 minutes to mix thoroughly. Next step, pour 60 ml of
tetraethyl ortho silica (TEOS) into 50 ml of ethanol and 10 ml of water
and acidify its pH using hydrochloric acid, and then pour it into the
decanter and add it drop by drop to the solution inside the balloon and
allow to stir for 2 hours for further mixing. In the third step, the
contents of the balloon are poured into the crystallizer and placed
slightly in the exposure of air for 7 days, and the alcogel is obtained.
After 7 days, place the resulting alkogel in an oven at 110 oC for 24
hours to allow it to dry and xerogel obtain. The xerogel were calcined
for 2 hours in an oven at 800 oC with a heating rate of 10 oC/min and
the product were milled by a satellite mill.