I made iron oxide nanoparticles via co-precipitation method and obtained a brown colour slurry with neutral pH and I did ex situ coating of oleic acid on nanoparticles and washed it with ethanol and water but i don't know if oleic acid is coated on my nanoparticles or not?
Procedure:
Nanoparticles slurry(100ml)
Oleic acid(1.6ml)
Ethanol(6.6ml)
Oleic acid:ethanol=1:4
Were magnetically stirred at 80C for 1 hour and washed with ethanol at 6000rpm for15 min and second washing was done with water at same rpm for 5 min but i didn't get two separate layers with brown colour layer on top of water. So i don't know if my particles are coated or not. All i got was brown pellet. Also i need to know the solvent which i should use for washing and also for suspending nanoparticles for my application. I want to know the suitable pH if i add oleic acid during synthesis of fe3o4 nanoparticles? I have attached the protocol below
Hira Waqar
If the particles are coated with oleic acid they they won't wet in water.
Hira Waqar
If the particles are coated with oleic acid they they won't wet in water.
Hello,
if you observe a change on your suspension (stability, decrease of aggregation) of Fe3O4 nanoparticles in an organic solvent before and after the coating with oleic acid, you can conclude that a part of oleic acid molecules is grafted to the NPs.
In addition you can try to measure the zeta potential of your NPs to find a change induce by the presence of oleic acid.
Best regards,
Two standard techniques to identify the organic coating molecules are FTIR and XPS in this context.
If you use oleates or any other surfactants like PAA, PVP, PEG, PVA etc, you can find the lattice vibration modes from FTIR precisely. For pure Fe3O4, you'll get just one absorption mode for Fe-O lattice bonds, while for coating molecules there will be a number of additional modes.
In XPS also, if you deconvolute the O 2p or C 2p bands, you'll get contributions from mono- or bidentate carboxylate groups, whatever present, against particular binding energies.
The following article has discussion on it.
Article Size-modulation of functionalized Fe3O4: Nanoscopic customiz...
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