Carbon materials with nanopore structures are of great importance for development of energy storage and gas adsorption devices. The critical parameter is pore size and it is difficult to predict.Our group is focused on preparing such carbons from solvents that contains a carbon precursor and does not contain water, the so called deep eutectic solvents (DES). DES are mixed with a water solution of formaldehyde to form a polymer that after carbonization generates the porous carbon. We have hypothesized that pores come from the formation of DES-water nanodomains when the DES is mixed with the water solution. H NMR and Brillouin spectroscopy of water-DES mixtures and simulations seem to agree with the hypothesis. Just by using neutron diffraction to analyse the mixtures would be possible to address this really interesting issue that could allow usto easily predict pore sizes of carbons.