2.3. Polarized light microscopy
The microstructure of the emulsions was evaluated using a microscope (Olympus BX51, Olympus Optical Co., Ltd., Tokyo, Japan) equipped with a video camera (KPD50, Digital Hitachi, Tokyo, Japan), a heating/cooling stage (LTS 350, Linkam Scientific Instruments, Ltd.) connected to a temperature control station (TP94 and Linksys32 V 1.3.1; Linkam Scientific Instruments, Ltd., Surrey, England), and a tank of liquid nitrogen. Maintaining the temperature of the stage at 25°C we obtained images of the sample using polarized light.