For the case considered in this study, the above lead to r m = 2.35 nm, r o = 2.39 nm and o = -535.2 K. Setting U = 0.1 o in Eq. ( ) and solving for r, we get an estimate for the inner radius of the outer layer: r 1 = 2.12 nm. Both, the values for r o and r 1 computed here are within 1% of the values for the boundary of the inner most layer for CO 2 at 1 bar from Fig. in Reference .