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확산 영동에 의한 입자 움직임에서 변화하는 제타 전위의 영향
이새봄(Saebom Lee),이진기(Jinkee Lee),Jesse T. Ault 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
A local solute concentration drives the motions of particles in solutions, where this phenomenon is called diffusiophoresis. Throughout previous studies and applications such as particle trapping, separation and etc, zeta potential plays an important to manipulate the particles. Many studies have used the assumption of constant zeta potential due to the theoretical simplification. However, the zeta potential varies as a function of solute concentration. In this study, we reexamine recent studies using the assumption of constant zeta potential and recalculate the particle dynamics via diffusiophoresis under a variable zeta potential model. First, we reconsider the diffusiophoresis-induced particle banding investigated by Staffeld and Quinn. We then revisit the particle injection into a dead-end pore described by Ault et al. Finally, we show the role of variable zeta potential on the particle spreading behaviors studied by Chu et al. The variable zeta potential model gives more accurate results.