Loading Polymer Coated Magnetite Nanoparticles On Nylon 6 Nanomembranes By Three Methods
In this study carboxylic acid coated magnetite nanoparticles (CA-Fe3O4 NPs) were applied to mechanically robust, Nylon 6 nanomembranes by three different techniques; 1) simultaneous electrospraying-electrospinning, 2) layer-by-layer (LbL) assembly, and 3) chemical grafting of NPs onto Nylon 6. The aim of this study was to evaluate the NP treatment homogeneity by the three methods and examine the durability on the membranes for potential wastewater treatment applications. The carboxylic acid polymeric coating on the NPs facilitated loading by all methods to display differing chemical bonding pathways: hydrogen bonding, ionic bonding, and covalent bonding. Electrospinning the fibers while simultaneously electrospraying is a simple method to incorporate NPs within fibers independent of polymer-particle solvent compatibilities. LbL assembly can allow for the number of NP layers to be controlled. The grafting method can allow for the formation of a durable, covalent bond between the carboxylate groups of the NPs and amine end groups on Nylon 6. Main characterization techniques included electron microscopy, CIELAB spectrophotometry, and ICP-AES analysis. Results reveal that electrospinning-electrospraying and chemical grafting methods produced a homogeneous NP dispersion on the membranes. ICP-AES results indicate that the durability of the treatments is pH dependent and driven by electrostatic interactions. These surface treatment methods have not been previously attempted with Nylon 6 fibers and polymer coated Fe3O4 NPs. Additionally, few studies evaluate the durability of NP treatments on fibers although it is an issue of high concern and the NP treatment should be long lasting for the intended end-use.
Electrospraying; Layer-by-Layer assembly; EDC/NHS chemical grafting
Frey, Margaret W
Estroff, Lara A.
M.S. of Fiber Science
Master of Science
dissertation or thesis