i am trying to make oleic acid capped iron oxide nanoparticles. but there comes washing problems.
my method was
1. reaction mixture 10ml+ ethanol30ml mix
magnetic separation. decant supernatant.
2. add little ethyl acetate to remove remained 1-octadecene(reaction solvent). decant ethyl acetate.
3. dried over high vacuum for 1h.
4. tested dispersion ability in n-hexane, chloroform , and cyclohexane.
sometime they were dispersed well in nonpolar solvent, but somtimes they didnt be dispersed in nonpolar solvent.(Agglomerated)
is there any precaution when i wash nanoparticles? i check TEM image and found nanoparticles were well made.
You did not mention at what step you added the oleic acid and what is the size of your particles. the capping process should be done during nano particles formation otherwise they agglomerated.
capping process has no problem because i checked by TEM image when nanoparticles were little bit wet with 1-octadecene. i just had washing problem after reaction finished. when particles were completely dried. they didn't be dispersed nonpolar solvent
You may want to check this somewhat related discussion: https://www.researchgate.net/post/How_to_achieve_100_removal_of_oleic_acid_capping_agent_from_nanoparticles_surface
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