| RESEARCH | Other scientists have weighed in as well. For example, physics professor Peter C. Eklund and postdoctoral fellow Bhabendra K. Pradhan at Pennsylvania State University have observed hydrogen uptake of 6 wt% in nanotubes--but at 77 K, the temperature of liquid nitrogen. At room temperature, they tell C&EN, nanotubes adsorb only "negligible" amounts of hydrogen. The 6 wt% uptake at 77 K is not of practical consequence for vehicles, they believe, because of the costs that would be involved in maintaining the storage system at that temperature. |
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