Diffusiophoretic velocity of a large spherical colloidal particle in a solution of general electrolytes

The general expression is derived for the diffusiophoretic velocity of a large spherical colloidal particle of radius a in a concentration gradient of general electrolytes of Debye-Huckel parameter kappa. On the basis of this expression, simple approximate analytic expressions for the diffusiophoretic velocity correct to the order of (1/kappa a)(0) are derived, which can be applied for large particles with kappa a >= 50 at arbitrary values of the particle zeta potential with negligible errors.