Critical bubble diameters and Plateau border dimensions for drainage in aqueous xanthan foams

Xanthan gum is used to stabilize aqueous foams in a wide number of commercial and industrial processes one the numerous hydrosoluble polymers slow foam drainage. The slowing effects viscosity on drainage flow have been well studied but situations leading delay are poorly described literature. aim this study was shed light mechanisms governing initiation. Drainage seems be result liquid retention caused by confinement xanthan molecules Plateau borders, which increases local yield stress. begins when bubbles borders grow above certain threshold size that allows through foam.