Hi,
Sorry to hear about your troubles reproducing the results. In our experience, the synthesis is particularly sensitive to the quality of chemicals, as well as concentrations/ratio of chemicals used as well as mixing speeds. I would suggest to make sure the solutions are filtered, and prepared with fresh chemicals. Debris/small particles in the initial solutions could cause forming large aggregates. I hope this helps,
Best regards,
T 2020-10-18 18:52:53