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. 2022 Jul 30;89:106108. doi: 10.1016/j.ultsonch.2022.106108

Fig. 4.

Fig. 4

Time evolution of the interfacial tension (mN/m) for the adsorption of PPI and treated PPI samples at the oil (MCT)-water (A-B) and air -water (C-D) interfaces (Kdiff quantifies the diffusion rate).