Visco-elastic, isotropic materials based on water, fluorinate sufactants and fluorinated oils, process for their preparation, and their use in various fields, such as optics, pharmacology and electrodynamics

Viscoelastic materials having the apperance and consistency of gels comprising fluorinated surfactants, fluorinated oils, and a solvent composition selected from the group consisting of water and mixtures of water and a water-miscible solvent, said materials containing from 60 to 98% by weight of water;

• wherein a continuous phase of said materials comprises a mixture of said fluorinated surfactants and said fluorinated oils;
• wherein said surfactant is a nonionic surfactant selected from the group consisting of
• (1) compounds of the formula R.sub.F (CH.sub.2).sub.P R(OH) wherein p is less than 3, R.sub.F is a perfluorinated carbon chain, and R represents a chain of (OC.sub.2 H.sub.4) units, in which at least one oxygen atom is optionally replaced by a sulfur atom;
• and
• (2) compound of the formula ##STR2## wherein p is less than 3;
• and (3) surfactants having an HLB, according to the Griffin formula, of less than 8, comprising a hydrophilic group containing O(C.sub.2 H.sub.4).sub.n groups wherein n>2 and a fluorinated hydrophobic group RF containing (C.sub.x F2.sub.x) groups wherein 4<x<12.