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    Directed self-assembly of silica nanoparticles in ionic liquid-spun cellulose fibers

    Year: 2019

    Journal: J. Colloid Interface Sci., Volume 553, OCT 1, page 167–176

    Authors: Trojer, Markus Andersson; Olsson, Carina; Bengtsson, Jenny; Hedlund, Arthur; Bordes, Romain

    Organizations: Swedish research council FORMASSwedish Research CouncilSwedish Research Council Formas [2016-61]; Henni Auvinen at Biolin Scientific

    Keywords: Wet-spinning; Biocomposites; Mechanical properties; Surface topography; Plasma-enhanced chemical vapor deposition

    The application range of man-made cellulosic fibers is limited by the absence of cost- and manufacturing efficient strategies for anisotropic hierarchical functionalization. Overcoming these bottlenecks is therefore pivotal in the pursuit of a future bio-based economy. Here, we demonstrate that colloidal silica nanoparticles (NPs), which are cheap, biocompatible and easy to chemically modify, enable the control of the cross-sectional morphology and surface topography of ionic liquid-spun cellulose fibers. These properties are tailored by the silica NPs' surface chemistry and their entry point during the wet spinning process (dope solution (SiO2)-Si-D or coagulation bath (SiO2)-Si-C). For (SiO2)-Si-C-modified fibers, the coagulation mitigator dimethylsulphoxide allows for controlling the surface topography and the amalgamation of the silica NPs into the fiber matrix. For dope-modified fibers, we hypothesize that cellulose chains act as seeds for directed silica NP self-assembly. This results for (SiO2)-Si-D in discrete micron-sized rods, homogeneously distributed throughout the fiber and for glycidoxy-surface modified (SiO2)-Si-D@GLYEO in nano-sized surface aggregates and a cross-sectional core-shell fiber morphology. Furthermore, the dope-modified fibers display outstanding strength and toughness, which are both characteristic features of biological biocomposites. (C) 2019 Published by Elsevier Inc.
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