Electrospun Antimicrobial PVDF-DTAB Nanofibrous Membrane for Air Filtration: Effect of DTAB on Structure, Morphology, Adhesion, and Antibacterial Properties

Antimicrobial polyvinylidene fluoride (PVDF) membrane modified by dodecyltrimethyl ammonium bromide (DTAB) has been electrospun using simple one-step technology, where the modifying agent DTAB is dissolved in spinning solution. X-ray photoelectron spectroscopy and electrokinetic analysis confirm reliably the presence of DTAB on the nanofibers surfaces; electrokinetic analysis shows the changes of zeta potential due to modification by DTAB. X-ray diffraction shows that electrospinning converts the part of phase (approximate to 40%) present in PVDF powder into phase with all trans (TTT) zigzag chains conformation in PVDF electrospun membrane. Surface modification does not affect the phase composition of PVDF nanofibers, just only leads to lower crystallinity (smaller size of crystallites) in PVDF nanofibers. DTAB causes the curling of fibers and their aggregation, what completely changed the membrane structure. DTAB-modified membrane exhibits antibacterial properties against Staphylococcus aureus subsp. Aureus. Concentration of 0.5 wt% DTAB in spinning solution causes partial inhibition of bacterial growth only, while 1.0 wt% concentration leads to complete inhibition.

由溴化二铵溴化物（DTAB）改性的抗菌聚氯乙烯氟化物（PVDF）膜可通过简单的一步式技术将改性剂DTAB溶解在纺丝溶液中。X射线光电子光谱和电动力学分析可靠地证实了DTAB在纳米纤维表面的存在：电动力学分析表明，电动分析表明，由于DTAB的修饰，ζ电位发生了变化。 X射线衍射表明，静电纺丝将PVDF粉末中存在的部分相（约40％）转化为具有PVDF电纺膜中所有反式（TTT）锯齿链构象的相。表面改性不会影响PVDF纳米纤维的相组成，仅会导致PVDF纳米纤维的结晶度较低（微晶尺寸较小）。 DTAB引起纤维的卷曲及其聚集，这完全改变了膜的结构。 DTAB修饰的膜对金黄色葡萄球菌亚种表现出抗菌性能。纺丝溶液中DTAB的浓度为0.5 wt％只会部分抑制细菌生长，而浓度为1.0 wt％会导致完全抑制细菌生长。

Published: 2018

Journal ：MACROMOLECULAR MATERIALS AND ENGINEERING

Impact Factor：3.856

Paper link: https://onlinelibrary.wiley.com/doi/abs/10.1002/mame.201700415