Hi,
Does somebody have an idea to disperse FeNWs (or AgNWs) in organic solvents such as acetone, chloroform, and ethyl acetate?
If a surfactant does the trick, please recommend me a proper one.
Thanks.
I assume you're starting with a powder?
Surfactants are wetting agents. If your system wets in the continuous phase then a surfactant is not required. After separation (the rate determining step) then stabilization may be required. The only dispersing agent is energy. If you have an aggregated system in the dry powdered state then it will be impossible to disperse the material. Many people will use large amounts of ultraound energy which will mill the system (and this will be stated to be 'dispersion') and cause excessive localized heating:
See for example:
- Dispersion and nanotechnology https://tinyurl.com/y2wfzed7
- Ultrasound, cavitation, and the singing kettle http://tinyurl.com/olueohz
- Adhesion and cohesion http://tinyurl.com/zwb2wlh
I am not 100% certain how it will react for iron... but in the case of Ag2Se or AgInSe2 nanocrystals, oleic acid and oleylamine are good ligands for suspension in chloroform or hexanes. However, it will precipitate in acetone!
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