“…Among these non-ionic surfactants, polyethoxylated alkyl ones (C n E m , where n is the number of carbons of the hydrophobic and saturated linear chain, and m is the number of ethoxy groups in the polar head) [12] are one of the most useful surface-active substances, attracting the interest of the scientific community, due to their remarkable and unique properties [13][14][15]. In the oil industry, they have been used in metalworking fluids [16], drilling fluid formulations [17] as well as systems with biocide activity [18].…”