Slush Hydrogen Storage
Some of the problems associated with the utilization of hydrogen include its low density, temperature stratication, short holding time due to its low latent heat, hazards associated with high vent rates, and unstable transport conditions caused by sloshing of the liquid in the fuel tank. Rapial and Daney  report that there are two techniques that can completely eliminate some of these undesirable features and partially eliminate the others. One is the production of liquid-solid hydrogen mixtures, slush hydrogen, by further refrigeration of the liquid. The other is the gelation of liquid hydrogen by the addition of a ne particle gelling substance.