Journal
COLLOID AND POLYMER SCIENCE
Volume 299, Issue 12, Pages 1877-1884Publisher
SPRINGER
DOI: 10.1007/s00396-021-04898-3
Keywords
Diffusiophoretic velocity; Diffusiophoresis; Spherical particle; Zeta potential
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The general expression for the diffusiophoretic velocity of large spherical colloidal particles in a concentration gradient of general electrolytes is derived, and simple approximate analytic expressions for the diffusiophoretic velocity have been obtained. These expressions are suitable for large particles with negligible errors.
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.
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