Table 3. Mann–Kendall trend test data for correlation between speed (rpm) and core size (nm), hydrodynamic diameter (nm), zeta-potential (mV) and polydispersity index (PDI).

Parameter	Core size (nm)	Hydrodynamic diameter (nm)	Zeta potential (mV)	Polydispersity index (PDI)
Kendall's tau	−0.563	−0.600	−0.534	0.067
S	−76	−9	−35	1
Var (S)	587.333	28.333	211.667	28.333
p-Value (two-tailed)	0.002	0.133	0.019	1.000
α	0.05	0.05	0.05	0.05