Kimura Hiroshi, Sakakibara Mirei
Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Gifu 501-1193, Japan.
Materials (Basel). 2025 Mar 14;18(6):1289. doi: 10.3390/ma18061289.
When a horizontal electric field is applied, the sedimentation velocity of particles increases, a phenomenon known as Electrically Induced Rapid Separation (ERS). Hollow particles with a lower density than water exhibit an increased flotation velocity under an electric field. This study investigates the ERS effect in mixed suspensions containing particles denser than water and hollow particles with lower density. In the absence of an electric field, the denser particles settle while the hollow particles float, and their behavior is independent of the ratio of hollow particles to the total number of particles (). However, when a DC electric field of 0.4 V/mm is applied, the behavior becomes dependent on . For < ~0.90, all particles sediment, whereas for > ~0.93, all particles float. This suggests that the electric field induces a co-floc formation between the denser and hollow particles. Additionally, for the first time, a co-floc formation under an electric field was directly observed using a digital microscope. By adjusting and applying an electric field, it is possible to control the sedimentation, flotation, or stabilization of the particle system. This study provides new insights into electric field-assisted particle separation and highlights its potential applications in colloidal science and materials science.
当施加水平电场时，颗粒的沉降速度会增加，这种现象被称为电诱导快速分离（ERS）。密度低于水的空心颗粒在电场作用下会表现出增加的浮选速度。本研究调查了在含有比水密度大的颗粒和密度较低的空心颗粒的混合悬浮液中的ERS效应。在没有电场的情况下，密度较大的颗粒沉降，而空心颗粒漂浮，并且它们的行为与空心颗粒与颗粒总数的比例无关（）。然而，当施加0.4 V/mm的直流电场时，行为变得依赖于。对于<0.90，所有颗粒沉降，而对于>0.93，所有颗粒漂浮。这表明电场会在密度较大和空心颗粒之间诱导形成共絮凝物。此外，首次使用数字显微镜直接观察到电场下的共絮凝物形成。通过调节并施加电场，可以控制颗粒系统的沉降、浮选或稳定。本研究为电场辅助颗粒分离提供了新的见解，并突出了其在胶体科学和材料科学中的潜在应用。
