Sato Anna, Wang Ran, Ma Hongyang, Hsiao Benjamin S, Chu Benjamin
Ward Melville High School, East Setauket, NY 11733, USA.
J Electron Microsc (Tokyo). 2011;60(3):201-9. doi: 10.1093/jmicro/dfr019. Epub 2011 May 11.
We demonstrate a new class of composite fibrous membranes, consisting of an ultra-fine cellulose nanofibrous network infused into an electrospun polyacrylonitrile (PAN) nanofibrous scaffold on a melt-blown polyethylene terephthalate (PET) non-woven substrate for water purification. Depending on the infusion process and the ultra-fine cellulose nanofibers (UFCNs) used [e.g. modified ultra-fine cellulose nanofibers (m-UFCNs) or microcrystalline cellulose nanofibers (MCCNs)], different nanostructured scaffolds were formed as seen by electron microscopy. Membranes with UFCNs consist of an interwoven two-dimensional ultra-fine nanofibrous network that is deeply entangled with the electrospun scaffold and organized in a quasi-three-dimensional fashion, while those with MCCNs tend to locally wrap around the electrospun scaffolding nanofibers without forming a major network. Filtration tests illustrated that both membranes, while maintaining high permeation flux, exhibited excellent retention capabilities for simultaneous sieving for bacteria and adsorption for viruses.
我们展示了一类新型复合纤维膜，它由超精细纤维素纳米纤维网络注入到熔喷聚对苯二甲酸乙二酯（PET）非织造基材上的静电纺聚丙烯腈（PAN）纳米纤维支架中构成，用于水净化。根据注入过程和所使用的超精细纤维素纳米纤维（UFCN）[例如改性超精细纤维素纳米纤维（m-UFCN）或微晶纤维素纳米纤维（MCCN）]，通过电子显微镜观察可以看到形成了不同的纳米结构支架。含有UFCN的膜由交织的二维超精细纳米纤维网络组成，该网络与静电纺支架深度缠结并以准三维方式排列，而含有MCCN的膜则倾向于局部包裹静电纺支架纳米纤维而不形成主要网络。过滤测试表明，这两种膜在保持高渗透通量的同时，对细菌筛分和病毒吸附均表现出优异的截留能力。
