Fig. 5 Calculated electric field in different width. Absolute
values of the electric field strengths in PH pores (left) are observed
to be larger than those in HH nanopores (right). Increases in pore width
decreases the strength of the electric field in both pore systems.
In Fig.6, we discuss the orientation of the water molecules at a
concentration of 58.82% in both pore systems. The water orientational
direction is defined as the angle between V1 and
V2 vectors (Fig. 6a), where V1 is a unit
vector normal to the surface and V2 is the OH vector.
Fig. 6b shows one sharp peak in the PH pore at
130° indicating that the two OH
bonds are aligned with the direction of the electric field. These
results are similar to those presented in Skinner et al.89. The OH bond orientation in HH pores is more
heterogeneous with a relatively weaker peak at 90°, which is consistent
with Cramer et al. 90. Figs. 5 and 6 confirm that the
existence of electric field influences the orientation of water
molecules within the pore.