Partially fluorinated ureas and amides

A composite material comprising a porous support and a porous nanoweb, wherein said porous nanoweb comprises fibrous structures of about 10 nm to about 1000 nm effective average fiber diameter as determined with electron microscopy;

• said fibrous structures comprising one or more compounds of formula (I):
• Ro-[L-(CqH2qS)pCrH2rRf]2 (I)
• wherein
• Ro is a divalent organic group having 2 to 40 carbon atoms;
• L is a linking group selected from —NHC(O)NH— or —C(O)NH— wherein the left side of the linking group is bonded to Ro;
• p is an integer of 0 or 1;
• q is an integer of 2 to 10;
• r is an integer of 1 to 10;
• and
• Rf is a linear or branched C1-C6 perfluoroalkyl group.

A method for making a composite material comprising a porous support and a porous nanoweb comprising:

• (a) providing a porous support;
• (b) providing a gelling mixture comprising one or more solvents and one or more organogelator(s);
• (c) applying the gelling mixture to the porous support;
• (d) inducing said organogelator(s) to form a nanoweb gel;
• and
• (e) removing the solvent(s) from the nanoweb gel to provide a dry porous nanoweb coating on said porous support;
• wherein said organogelator(s) is one or more compositions of formula (I):
• Ro-[L-(CqH2qS)pCrH2rRf]2 (I)
• wherein
• Ro is a divalent organic group having 2 to 40 carbon atoms;
• L is a linking group selected from —NHC(O)NH— or —C(O)NH— wherein the left side of the linking group is bonded to Ro;
• p is an integer of 0 or 1;
• q is an integer of 2 to 10;
• r is an integer of 1 to 10;
• and
• Rf is a linear or branched C1-C6 perfluoroalkyl group.