(color online) Self-diffusion difference of the methane in the hydrophobic nanochannel between pattern-1 and hydrophobic systems. (a) Self-diffusion behavior of methane gas inside the particle configurations for hydrophobic and pattern-1 systems by using van Hove distribution G(r, t). The difference between pattern-1 and hydrophobic systems in the diffusion direction are shown within 2 ns. The black and red lines correspond to the result of pattern-1 and hydrophobic systems, respectively. (b) Density distributions of water around the particle configurations in pattern-1 and hydrophobic systems. Blue and white colors represent the highest ( 1.0 × 10 − 4 nm − 2 ) and lowest density ( 0 × 10 − 4 nm − 2 ) , respectively. The particle assemblies and the uninterrupted hydrophobic nanochannels shown as the green segments are also represented.