I tried to obtain TiO2 nanoparticles by combining a solution of titanium isopropoxide (TTIP 1 mM, dissolved in isopropyl alcohol) and epigallocatechin gallate (EGCG 1 mM, in water), but, even though UV-Vis spectrum indicated the NPs were formed, I couldn't obtain a precipitate. Probably the nanoparticles are still soluble in isopropanol? Does anyone have any idea what is going on in the reaction between TTIP and EGCG and how can I purify the nanoparticles?
Bogdan Andrei Miu
You've got a dispersion of small nanoparticles that slowly precipitate out. It is necessary that the dispersion stand for a long time for precipitation to occur. Or you need to use an ultracentrifuge to precipitate them.
Bogdan Andrei Miu If they're genuinely nano (< 100 nm) then they will not precipitate out (Brownian motion will keep them suspended) but will remain in clear suspension. The liquid will be as clear as water for such systems (or colored for other small colloids such as a Au sol).
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