Can anybody confirm if 47nm Al2O3 dispersion be done with 30 min of sonication in DI water? My co-worker insist that 30 min of sonication be good enough for the dispersion but as far as I know, 30 min of sonication couldn't be any close to the dispersion. Am I right? Can anybody suggest for the better dispersion method for this? I want to disperse without any surfactant. I want to disperse AL2O3 into pure DI water with the dilution of 0.5%, 1% ... Please suggest whatever method you know. Thanks,