Hello,
I just synthesized graphene oxide by hummers method, I filtered and washed it several times, now I have a very brown, vicous solution with small, visible particles inside. After sonication I got a rheoscopic (movement showing), relatively stable suspension. Is this normal?? This is my first attempt on hummers method.
The viscous brown solution is 20mg/ml and the sonicated solution is 5mg/ml, here a pic of the sonicated one:
I used hummers method and washed the product by decanting, filtering and washing it with oxalic acid (substitute for HCl).
And i used no H2O2 for washing.
Now I have a ph of about 1.
Apart from this I followed this procedure:
https://photos.app.goo.gl/eveDnetvZzw9lVZs2
https://pdfs.semanticscholar.org/9dd3/4023a4af4441016958d84b2ce5a47ab6bdf8.pdf
The above link may clarify your doubts
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