Table 1.

Results of the least-square fitting of the data shown in Fig. 5, summarizing the diffusion coefficients of CO determined by PFG NMR at 15 bar and 25 °C for 3 different diffusion times t in the absence (D_bulk) and presence of npAu (D₁, D₂)

t [ms]	Dbulk (10 −7) [m2/s]	RMSD1 [µm]	RMSD2 [µm]	D1 (10 −7) [m2/s]	D2 (10 −7) [m2/s]	D2/D1
6	14 ± 1	149 ± 15	218 ± 15	7.0 ± 1.4	15 ± 2	2.1 ± 0.5
10	14 ± 1	201 ± 20	290 ± 20	7.2 ± 1.4	15 ± 2	2.1 ± 0.4
30	13 ± 1	430 ± 20	430 ± 20	10.5 ± 1	10.5 ± 1	–

In the presence of npAu and for diffusion times of 6 ms and 10 ms two gas ensembles can be distinguished between: one diffusing inside (subscript: 1) and one outside (subscript: 2) of npAu. In addition to the corresponding diffusion coefficients, the root mean square displacements (RMSD) are given. The last column shows the ratio D₂/D₁, corresponding to the tortuosity factor τ, according to Eq. 12