Mohamad Mehyo

The problem with magnetic particles is that the long range magnetic forces always will overcome any charge ('electrostatic') stabilization attempts (and van der Waals forces are always attractive. The only route to stabilization is steric and a polymer such as PEG or PEI on the surface of the particles. This can be accomplished with a number of liquids. Problems with acetone include high volatility, flammability, low density, low viscosity, difficulty in adding ionic components (insolubility), no concept of pH and difficulty manipulating the external continuous phase, hardening of many plastics used in beakers and tubing...

If you're starting with a powder then there is basically no hope although the basic stages of making a stable dispersion are:

• Wetting
• Separation - the key step
• Stabilization

See (registration required):

Dispersion and nanotechnology

https://www.malvernpanalytical.com/en/learn/events-and-training/webinars/W190528DispNanoMat

BTW, why are you using an upper-case 'A' for acetone?

Alan F Rawle

Thank so much for your answer and useful information. About the "A" for acetone it was a writing mistake.

Please check polarity of nano particles you fabricated and polarity of solvent you want to use as dispersing agent. Polar materials dissolve in polar solvents and non-polar materials dissolve in non-polar solvents. With this knowledge you can choose best dispersing solvent for your nano particles fabricated.

Hope this helps!

Manasa Perikala

Thank you so much for your reply. But if you have information,

From literature when the magnetite iron oxide is synthesized they are using acetone for washing the obtained nano-particles then separating. Actually my field is mechanical engineering and I have almost no experience in chemistry field. My main interesting in this aspect that if I want to use Fe3O4 nano-powder in one solution has acetone as one of its components will the chemical composition of Fe3O4 change? of course because of the acetone.

And is acetone may be a good chemical medium for helping to dispersing these nanoparticles ?

Mohamad Mehyo Without knowing surface chemistry of material it would be difficult in choosing best dispersing solvent. In the other case what i suggest you is try dispersing your nano particles in 3 different solvents- one highly polar, another having both polar and non-polar ends, lastly in non-polar solvent. Good dispersing solvent for a mateial will leave no residue when material is dispersed in a solvent.

https://www.masterorganicchemistry.com/2012/04/27/polar-protic-polar-aprotic-nonpolar-all-about-solvents/#:~:text=Polar%20solvents%20have%20large%20dipole%20moments%20(aka%20%E2%80%9Cpartial%20charges%E2%80%9D,hydrocarbons%2C%20such%20as%20gasoline).

Manasa Perikala @Mohamad Mehyo

The answers are similar in this earlier question:

https://www.researchgate.net/post/Nanoparticles_electerical_charge

Alan F Rawle I agree!