Abstract: These materials having the appearance and the consistency of gels are characterized in that they contain a very high proportion of water, of the order of from 60 to 98% weight, and that their structure is a microcellular compartmentalized structure having a very high density of water droplets enclosed in a fine surfactant membrane and contained in a continuous oil/surfactant phase, this structure being impermeable to water and permeable to hydrophobic compounds soluble in fluorocarbons.Use in the field of optics, fillers, cosmetics, pharmacology, lubricants, textiles, photochemistry and electrodynamics.

Abstract: The invention relates to the preparation and use of novel extracting agents and novel propane diamides for the recovery of actinides and/or lanthanides.These extracting agents are constituted by propane diamides of formula: ##STR1## For example, the extracting agent can be 2-hexyl-N,N'-dimethyl-N,N'-dibutyl-propane diamide or 2-ethoxyethyl-N,N'-dimethyl-N,N'-dibutyl-propane diamide.They are more particularly used for the recovery of actinides and/or lanthanides present in the trivalent state in an acid aqueous solution, particularly in a nitric solution.

Abstract: The invention relates to non ionic fluorinated compounds having the formula R.sub.F C hd 2H.sub.4 S(R)H, wherein R designates a C.sub.2 H.sub.4 X unit with X=O or S, or a chain exclusively comprising several such units, and two consecutive units can be identical or different, and R.sub.F is a perfluorinated alkyl group exclusive of compounds having the formula:R.sub.F C.sub.2 H.sub.4 SC.sub.2 H.sub.4 OH, R.sub.F C.sub.2 H.sub.4 S(C.sub.2 H.sub.4 O).sub.2 H and R.sub.F (C.sub.2 H.sub.4 S).sub.2 Hand the mixtures of such compounds, in particular, the mixtures of the above defined products differing from one another by the length of their perfluorinated chain, but having the hydrophilic portion of the molecule identical from one product to the other.To obtain them, a compound having the formula R.sub.F C.sub.2 H.sub.

Abstract: The invention relates to novel extracting agents and novel propane diamides, their use for the recovery of actinides and/or lanthanides and their preparation process. These extracting agents are constituted by propane diamides of formula: ##STR1## For example, the extracting agent can be 2-hexyl-N,N'-dimethyl-N,N'-dibutyl-propane diamide or 2-ethoxyethyl-N,N'-dimethyl-N,N'-dibutyl-propane diamide. They are more particularly used for the recovery of actinides and/or lanthanides present in the trivalent state in an acid aqueous solution, particularly in a nitric solution.