title: Influence of double-layer polarization and chemiosmosis on the diffusiophoresis of a non-spherical polyelectrolyte.
abstract: The diffusiophoresis of a non-spherical polyelectrolyte (PE) is modeled theoretically by considering an ellipsoidal PE of fixed volume and varying aspect ratio, capable of simulating porous entities such as DNAs, proteins, and synthetic polymeric particles. A continuum model comprising coupled Poisson-Nernst-Planck equations and Stokes equations is adopted. Parameters including the physicochemical properties of a PE, the degree of deformation, and the bulk ionic concentration are examined in detail for their influence on the diffusiophoretic behavior of the PE. We show that the effects of double-layer polarization, polarization of the condensed counterions inside a PE, and the chemiosmotic retardation flow inside it yield complicated diffusiophoretic behavior. In particular, the mobility of an elliptic PE can differ both quantitatively and qualitatively from that of a spherical PE. This phenomenon, which has not been reported previously, provides valuable information for both experimental data interpretation and device design.
authors: Department of Mathematics, Tamkang University, Tamsui, Taipei 25137, Taiwan.
authors: Shiojenn
authors: S
authors: Tseng
authors: Institute of Polymer Science and Engineering, National Taiwan University, Taipei 10617, Taiwan.
authors: Dong-Huei
authors: DH
authors: Lin
authors: Institute of Polymer Science and Engineering, National Taiwan University, Taipei 10617, Taiwan; Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan. Electronic address: jphsu@ntu.edu.tw.
authors: Jyh-Ping
authors: JP
authors: Hsu
keywords: Chemiosmosis; Diffusiophoresis; Double-layer polarization; Non-spherical polyelectrolyte