characterization of the HDES systems was performed at room temperature
using the transmission mode of a BX-51 polarized optical microscope
(Olympus, Tokyo, Japan) connected to an Olympus KL2500 LCD cold light
source. One drop of each HDES system was placed on the respective
glass microscope slide for observation. Images were obtained using
the equipped camera (Olympus SC50) and Olympus Stream Basic 1.9 software
(Olympus, Tokyo, Japan).