  We account for the presence of surface charges towards describing variations
in the dynamic contact angle of an advancing liquid-gas meniscus. Starting from
the thin-film based formalism, we present closed-form analytical expressions
relating the dynamic contact-angle with the capillary number (essentially
normalized contact-line speed) and other interfacial parameters. Specifically,
our analysis presents, within the realm of hydrodynamic paradigm, a connection
between the micro- and macro-scale physics at the vicinity of the contact-line
region, taking the combined confluence of viscous and capillary forces along
with van der Waals and electrostatic interactions. This connection rationalizes
the hitherto reported anomalous window of the magnitude of the microscopic
length scales required to corroborate experimental data for ionic liquids.
Moreover, our analysis shows the possibility of a transition from strong to
weak influence of surface charge in a dynamic fashion with contact-line speed
along with other electrochemical parameters, leading towards substantiating the
reported multiple asymptotic behavior of dynamic contact-angle over a wide
range of capillary numbers.
