聚偏氟乙烯
材料科学
铁电性
膜
压力降
过滤(数学)
复合材料
纳米纤维
静电纺丝
空气过滤器
化学工程
分析化学(期刊)
聚合物
色谱法
光电子学
化学
机械工程
生物化学
统计
数学
物理
电介质
工程类
入口
热力学
作者
Tan Tan Bui,Min-Kyoung Shin,Seung Yong Jee,Dang Xuan Long,Jongin Hong,Myung‐Gil Kim
标识
DOI:10.1016/j.colsurfa.2022.128418
摘要
The significant public health concerns related to particulate matter (PM) air pollutants and the airborne transmission of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) have led to considerable interest in high-performance air filtration membranes. Highly ferroelectric polyvinylidene fluoride (PVDF) nanofiber (NF) filter membranes are successfully fabricated via electrospinning for high-performance low-cost air filtration. Spectroscopic and ferro-/piezoelectric analyses of PVDF NF show that a thinner PVDF NF typically forms a ferroelectric β phase with a confinement effect. A 70-nm PVDF NF membrane exhibits the highest fraction of β phase (87%) and the largest polarization behavior from piezoresponse force microscopy. An ultrathin 70-nm PVDF NF membrane exhibits a high PM0.3 filtration efficiency of 97.40% with a low pressure drop of 51 Pa at an air flow of 5.3 cm/s owing to the synergetic combination of the slip effect and ferroelectric dipole interaction. Additionally, the 70-nm PVDF NF membrane shows excellent thermal and chemical stabilities with negligible filtration performance degradation (air filtration efficiency of 95.99% and 87.90% and pressure drop of 55 and 65 Pa, respectively) after 24 h of heating at 120 °C and 1 h immersion in isopropanol.
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