Diffusiophoresis of concentrated suspensions of spherical particles with identical ionic diffusion velocities

Diffusiophoresis of a spherical particle normal to an air–water interface

“…A maximum was found at some κa first, and then the scaled velocity decreased thereafter. This phenomenon was also observed by Lou and Lee [16,17], who concluded that the local maximum in the velocity profile stemmed from the doublelayer polarization, which refers the distortion of electric double layer to the convective motion of the particle. The polarization effect due to the induced electric field always opposes the normal diffusiophoretic motion.…”

“…The former represents the equilibrium electric potential in the corresponding static situation without the externally imposed concentration gradient, and the latter denotes the induced electric potential due to ionic diffusion with the gradient. An additional perturbed potential g j is used to take into account the convection contribution to the ion flux, the so-called polarization effect [16]. It is further assumed that the concentration of solute is only slightly nonuniform over the length scale a; that is, a|∇n 0 | n 0 .…”

“…It has been proven a very powerful and efficient method in the fields of colloid science, such as electrophoresis [40] and diffusiophoresis [16,17]. The scaled velocity was determined by a total force balance F net exerted on the particle, which was obtained by integrating the viscous and electrical stresses over the surface of the particle (η = η 0 ).…”

“…Subsequently, most of the theoretical and experimental studies on diffusiophoresis have focused on a colloidal particle in an electrolyte solution, mainly due to its wide potential application in processes such as ionic deposition and film coating [5][6][7][8]. A series of theoretical investigations about diffusiophoresis of a spherical particle have been conducted by several researchers [9][10][11][12][13][14][15][16][17]. Among them, Ebel et al [6] performed a series of experiments to measure the diffusiophoresis of polystyrene latex particles in an electrolyte solution.…”

Mechano-chemical effects in weakly charged porous media

“…Accordingly, the results obtained for Diffusiophoresis of single particle in binary [30,[46][47][48][49] and mixed [50] electrolyte solutions can be rearranged for addressing asymptotic behavior of Osmosis through a porous system whose porosity approaches to unity. In many studies dealing with mechano-chemical effects the authors used the Cell Model approach for describing the systems with binary electrolyte solutions [51][52][53][54][55][56][57][58][59][60][61][62].…”