Interestingly, the maxima s measured for the three tested
liquids in Fig. 3 follow the sequence water (=161◦) > oil
(=159◦) > dodecane (=134◦) implying that the largest/smallest s
was obtained for the liquid droplets of the highest/lowest surface
tension, that is water (=72 mN/m)/dodecane (=25.3 mN/m).
The same sequence applies on the duration of the plateaus of the
curves of Fig. 3:the long plateau in Fig. 3a (water droplets) holds for
nanoparticle concentration>1% w/w and the hardly defined plateau
in Fig. 3b (oil droplets) is narrow as it is extended only within the
nanoparticle concentration range of 2–3% w/w. In Fig. 3c (dodecane
droplets) there is practically no plateau.