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Concept of Low Surface Energy Materials (LSEMs) ; a novel step towards sustainable products

Thèse Janwa El Maiss

salle des séminaires, Bâtiment Recherche Chimie

Two types of Low surface energy materials LSEMs can be recognized ; those which are firstly applied on solid surfaces to elaborate superhydro/oleophobic surfaces that are micro and nano structured, and secondly at the water/air interface to synthesize new ecofriendly surfactants.

LSEMs are essentially made from fluorinated compounds due to their unique properties of being both hydro and oleophobic as well as, their thermal and chemical stability in corrosive media.

This project shows that the creation of superhydrophobic materials with high oleophobic properties does not necessarily require the utilization of long and bioaccumulative perfluorocarbon chains. Two approaches were adopted in this field. The first strategy was to develop ProDOT derivatives bearing short fluorinated chains to study the influence of the fluorinated chain length on the surface wettability. The proceeding part was to explore the effect of the introduction of a hydrocarbon tail and study the effect of their type and chain length on the surface properties.

Another important aspect of this research involves the application of LSEMs on soft materials like surfactants as alternatives to toxic perfluorinated homologues. This study was done to explore the effect of the variant hydrocarbon chains with a short fluorinated tail of hybrid surfactants as well as the effect of the polar head. In this area, two families of hybrid sulfate and bisulfates were synthesized. Their physico-chemical properties were investigated and interesting results were obtained.