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doi:10.1063/1.2786007It has been proposed that nearly space-filling networks of nanopores in biocarbon may provide a “sponge” for lowpressure,high-capacity storage of methane  CH4  for advanced transportation.1 Such pores, a few molecular diameters wide, adsorb CH4 by strong van der Waals forces as a high- density fluid at low pressure and room temperature  supercritical adsorption. The dense fluid arises because, in narrow pores, the tails of the substrate potential from opposite walls overlap and create a deep potential well. In the absence of nanopores, CH4 would just be a low-density gas. Maximumdensity of CH4 is predicted in pores of width 1.1 nm.This work has been supported by NSF (PFI-0438469), DOE (DE-AC02-06CH11357), DED (P200A040038), University of Missouri, Midwest Research Institute, and Kansas City Office of Environmental Quality (loan of test vehicle). We thank Nicolle Rager, NSF, for the superb graphic

Complex pore spaces create record-breaking methane storage system for natural-gas vehicles