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. Author manuscript; available in PMC: 2019 Oct 2.
Published in final edited form as: Rev Mod Phys. 2019;91:10.1103/RevModPhys.91.021004. doi: 10.1103/RevModPhys.91.021004

FIG. 14.

FIG. 14

Colossal mechano-conductance and optimal transport in a graphene crown ether pore (bottom inset) (Sahu et al., 2019). Each oxygen and carbon at the pore rim has partial charge −0.24e and 0.12e, respectively. The top inset shows the effective dielectric constant (ϵr) near the pore center. Small changes in the pore size (i.e., 1 % to 2 %) due to strain result in a large (i.e., 200 % to 300 %) change in current. This is driven by a flattening of ΔF versus z – i.e., a tendency toward barrierless transport – but ultimately the charged groups do not compensate for dehydration and a larger barrier decreases I.