“…A standard method for determining the surface charge of micro/nanomaterials, based on the basic concepts of suspension stability, is the evaluation of zeta potential using the Zetasizer Nano-ZSP instrument. Zeta potential measures the degree of relative repulsion among colloidal particles and employs this information to determine the stability of a colloidal suspension [ 98 ]. This dynamic light scattering technique measured the approximate size of SPNFC particles and shows that SPNFC displayed notably negative zeta potential values (mV), with an average measurement of −32.1.…”