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Univ. Paris-Saclay

Sujet de stage / Master 2 Internship

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Encapsulation of carboxylate chains in multiple emulsions for the protection of ancient metals

Contact: GUENOUN Patrick, , patrick.guenoun@cea.fr, +33 1 69 08 74 33
The objective of the internship is to evaluate whether the encapsulation of carboxylates - recognized to be effective against metallic corrosion - can be gradually released from a multiple emulsion to ensure long term protection.
Possibility of continuation in PhD: Non
Deadline for application:20/12/2021

Full description:
Within the framework of the protection of heritage metals, the search for effective and durable solutions to fight against atmospheric corrosion, outdoors or in a museum context, is a major issue.

An approach studied in this project is based on a deep deposition in the porous layers of corrosion products (CPC) of hydrophobic complexing organic compounds through encapsulation. Corrosion inhibitors must meet aesthetic and reversibility criteria, while being inexpensive, easy to apply and non-toxic.

The encapsulation will be carried out using multiple emulsions which are used as a reservoir of carboxylates, and which destabilize by lowering the pH or reducing the ionic strength.

The principle is to encapsulate sodium decanoate in the aqueous core of the emulsions, to infiltrate the emulsions (based on a biocompatible oil, Miglyol®812) in the porous layer and to destabilize the emulsions in contact with CPCs to release the sodium decanoate.

The expected objective is a better understanding of the mechanisms of encapsulation in emulsions and a quantification of the release of sodium decanoate and its time scales after dialysis of the emulsion against an aqueous solution of osmolarity. controlled. Once the parameters have been optimized, the experiments will be conducted on CPCs of ferrous archaeological objects
Technics/methods used during the internship:
formulation, confocal microscopy, Raman spectroscopy

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