An aqueous solution containing 0.75 mM of magnesium acetate tetrahydrate, 0.25 mM of calcium ac- etate hydrate, 2 mM of iron (III) citrate tribasic monohydrate, and 3.1 mM of oleic acid was added to the pre-heated octadecylamine. The mixture was heated at 10 ◦C per minute until ...