I measured the size of nanobubbles using Malvern zetasizer ZS. Due to the unreliability of the average size (polydispersity index is high > 0.5 but < 0.1 is the acceptable value), I have to choose the size at the peak in the Intensity size distribution. In some cases, multiple peaks are obtained and this causes ambiguity in choosing the correct size For example, the average size of my sample is 1.5 microns (expected size
Taye Kazeem
I suspect you're measuring noise. What do your error reports say? Please post your .dts file/record so we can understand your question.
For a polydisperse sample the Z average / PDI isn't necessarily what to look at. The smallest peak is likely to be the bubbles, normally goes from 50 - 150 to 200nm with some larger bubbles beyond, normally over by 500nm.
The samples can be a bit of a stretch for the Zetasizer, NTA is normally the most appropriate technology. It works, but as Alan says, data can be noisy.
Hello Taye Kazeem , you may find this nanobubble blog post and the reference cited useful: https://www.materials-talks.com/blog/2019/02/07/nanobubbles-are-they-real/
Article Stability of Nanobubbles
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