Liquid composite compositions using non-volatile liquids and nanoparticles and uses thereof

A solvent composition comprising:

• a) an organic solvent;
• b) nanoparticles, said nanoparticles each having at least one dimension less than 25 nm and being dispersed individually in the solvent composition;
• and
• c) a non-volatile electrolyte
• wherein the nanoparticles have a surface that prevents substantial aggregation of the nanoparticles in the presence of the non-volatile electrolyte, and the solvent composition contains at least 20 wt. % of the dispersed nanoparticles.