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. 2020 Sep 10;608:125564. doi: 10.1016/j.colsurfa.2020.125564

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Fig. 5 — Visual characterization of the designed formulations. Aqueous: water; core oil: squalene; emulsifiers: PEG–PLA without a catalyst (sample P1) and PEG–PLA made by SnOct₂ (sample P2), Al(OH)₃ (sample P3), or AlPO₄ (sample P4) catalysis.