Kim Kiwoong
Department of Mechanical Engineering, Hannam University, Daejeon, Republic of Korea.
PLoS One. 2021 Apr 28;16(4):e0250343. doi: 10.1371/journal.pone.0250343. eCollection 2021.
Detailed understanding of ionic behavior in the region near a charged surface is important for the enhancement of water filtration mechanisms. In this study, a highly charged membrane is hypothesized to form an ion depletion zone (IDZ) without an external power supply. The formation of IDZ was experimentally investigated using membranes with varying surface zeta potential (SZP) values to confirm the hypothesis. The surface zeta potential of the charged membrane was controlled by layer-by-layer deposition method. Our results indicate that indicated that the fluorescent intensity near the charged surface becomes weaker with an increased absolute magnitude of SZP. Ionic surfactants enhance the formation of IDZ by increasing SZP magnitude, and by forming a secondary filtration layer. These findings provide information that is helpful in understanding the ionic behavior near the highly charged surface. In addition, the information provided by the findings would be helpful in fabricating a small-scale water filtration device.
深入了解带电表面附近区域的离子行为对于增强水过滤机制至关重要。在本研究中，假设一个高电荷膜在没有外部电源的情况下形成一个离子耗尽区（IDZ）。使用具有不同表面zeta电位（SZP）值的膜对IDZ的形成进行了实验研究，以证实该假设。带电膜的表面zeta电位通过逐层沉积法进行控制。我们的结果表明，带电表面附近的荧光强度随着SZP绝对值的增加而变弱。离子表面活性剂通过增加SZP大小和形成二级过滤层来增强IDZ的形成。这些发现提供了有助于理解高电荷表面附近离子行为的信息。此外，这些发现所提供的信息将有助于制造小型水过滤装置。
