Cobalt nitrate (CoNO3.6H2O), aluminum nitrate (AlNO3.9H2O), Zinc nitrate (ZnNO3.6H2O) bi-distilled water, urea, citric acid, trisodium salt, butyl alcohol, sodium hydroxide (NaOH), sodium nitrate (NaNO3), tween 20, sodium glycocholate, and oleic acid were purchased from Alfa Aesar, Germany. Essential oils of a commercially available jasmine oil blend consisting of Jasmine oil and Azores jasmine (J. sambac and J. azoricum, respectively) (Oleaceae) and peppermint (M. arvensis) (Lamiaceae) were bought from “Cap Pharm” EL CAPTAIN Company for extracting natural oils, plants, and cosmetics (El Obor, Cairo, Egypt); we would refer to the used oils as AJ and PP, respectively. All chemicals and essential oils were used without further purification or distillation.
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