How to effectively remove the surfactant CTAB in Au @ SiO2?

Everyone gives me a bit!!!!!!!

Dare to ask the host's question?

After I just reflux with ethanol, I originally colored Au @ SiO2, and the results became transparent.EssenceEssenceEssenceEssenceIt is how it happened?

Will ethanol add to corrodes?Is there any literature?This is a strange phenomenon.Ethanol returns colorlessness indicates that SiO2 has been washed away, and Jin Ju sank.

When I used CTAB to do experiments, I usually wash a lot of water. I do n’t know if it is useful to you

Hello, how do you put gold in the silica surface I found that I can't let go