  The charged dust on the surface of airless celestial bodies, such as the moon
and asteroids, is a threat to space missions. Further research on the charged
dust will contribute to the success of space missions. In this paper, we study
the charging and dynamics of dust particles with different work functions. By
integrating the photoelectron energy distribution function over four
illuminated areas with different work functions, we evaluated the photoelectron
concentration in these four areas. At each area, using the photoelectron
concentration, we solve the dust charging and dynamics equations with two
different gravitational acceleration values. The results reveal that the dust
with a larger work function can reach higher equilibrium states. These states
include dominant photoelectron-related charging currents, charge numbers, and
levitation heights. We suggest that the equilibrium states all hold a clear
inverse relationship with the work functions of dust particles when the solar
zenith angle varies from 0 to 90 degrees, displaying consistent trends under
different gravitational accelerations. We also find that dust particles seem
unable to stably levitate at a critical solar zenith angle. The value of this
critical SZA follows the same rule subjected to the work function.
