Hsu J.-P.Liu K.-L.Hsu W.-L.Yeh L.-H.Tseng S.2019-05-202019-05-20201015206106https://scholars.lib.ntu.edu.tw/handle/123456789/409326The diffusiophoresis of a charge-regulated spherical particle normal to two parallel disks as a response to an applied uniform electrolyte concentration gradient is modeled theoretically. The fixed charge on the particle surface comes from the dissociation/association reactions of the functional groups, yielding a charge-regulated surface, which simulates biological cells. Numerical simulations are conducted to examine the behavior of a particle under various conditions: the parameters considered in the simulation include the thickness of the double layer, the charged conditions on the particle surface, the relative size of the particle, and the particle-disk distance. Because the diffusiophoretic mobility of a particle can be dominated by chemiphoresis, electrophoresis, or osmotic flow, the diffusiophoretic behavior of the particle is complicated. For instance, the diffusiophoretic mobility may have two local maximums and a local minimum as the thickness of the double layer varies. This behavior is of practical significance if diffusiophoresis is adopted as a separation operation or as a tool to characterize the surface properties of a particle. ? 2010 American Chemical Society.journal article10.1021/jp907696t2-s2.0-77749248929https://www.scopus.com/inward/record.uri?eid=2-s2.0-77749248929&doi=10.1021%2fjp907696t&partnerID=40&md5=5c6de26909fe08a23f5e0fafbe606c47