Fig. 14 Comparison of single phase (water and hydrocarbon)
velocities between HH and PH nanopores of different widths. The
self-generated electric field in PH pores and the imposed acceleration
dictate fluid transport in the center of the pore. For the same
acceleration, the fluid velocity profile is flat in PH pores and
parabolic in HH pores.
Fig. 15 shows the distribution of water in 5 nm PH and HH pores.
Hydrocarbon is not shown for clarity. During transport, a water bridge
persists in PH pores as shown in Fig.15a. This is because of the
stronger electric field. Fig.12 also confirm the persistence of water
bridges in PH pores irrespective of pore size. However, the water bridge
of the HH nanopore breaks down as shown in Fig.15b. We can infer that
the strength of the hydrogen bond in the water bridge in the HH nanopore
is weaker compared to the forces holding the water bridge intact in the
PH nanopores.