The word unadulterated – I think it is not appropriate in this context. Unmodified would be better.
The mineral oil used is not specified.
The SEM photographs – how are they taken? With the particles in a liquid? The photos shows clear agglomerations.
The information of the supplier of the nanoparticles is missing.
Concerning the tests in section 2.2: is a new liquid used for every test?
2.3 A lot of ‘stands for’
3.2 The correlation coefficient rho must be described
Table 3 contains in principle the same information as Figure 7 and can be removed.
How was the voltage increased during the PDIV tests? Linear ramp? Ramp rate?
What was the condition used for inception?
The information given in Table 8,9 and 10 is already included in Figure 9.
In general the paper presents some empirical data that is of interest, but I think the paper has a low quality as such.