To calculate the Debye length of nanobubbles, the ionic strength of the solution is required.
SDS is 1-1 type electrolyte, there's an equation to calculate ionic strength of electrolyte solutions (https://en.wikipedia.org/wiki/Ionic_strength), after you check the website, you'll know how to calculate the ionic strength of SDS.
If you still don't know, please let me know.
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