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(a) Oil in water medium placed in a Petri dish. Inset shows the pure water; (b) Collagen-SPION nanobiocomposite is added on the oil; (c) Collagen-SPION nanobiocomposite after oil absorption. Inset shows the squeezed oil from oil-absorbed collagen-SPION nanobiocomposite; (d) Oil retention ability of the collagen-SPION nanobiocomposite as a function of time using premium and used motor oil.
