To study the effects of glycerol and Na–MMT on the wetability,
one droplet of dionized water was placed on the biopolymer
surface. The close view photo was captured using an optical microscope
and the pictures of both sides of water droplet were taken.
Contact angles were measured using ruler tool by Adobe Photoshop
CS5 (Adobe Systems, Inc., San Jose, CA) software. The initial
contact angles in three replications were measured.