Direct Electrospinning of Cellulose–Chitosan Composite Nanofiber

Abstract

The direct electrospinning of a non‐derivatized cellulose (Cs)–chitosan (Ch) composite nanofiber is described for the first time. Either of two cellulose preparations from different sources, i.e., cotton (CsC) or bamboo (CsB), is fabricated into composite electrospun non‐woven fabrics (ESNWs) with Ch using the trifluoroacetic acid–acetic acid mixed solvent. The total concentration of Cs + Ch in the mixed solvent is fixed at 4.0 wt.‐% with various Cs/Ch weight ratios of 8:2, 5:5 (Figure shows CsB/Ch‐ESNW), and 2:8, which are fabricated into fine fibers in the Cs/Ch‐ESNWs having average diameters mostly <100 nm. The treatment of the composite fibers with an alkaline–alcohol solution produces the water‐resistant ESNWs, which can retain their fine fibrous network in aqueous environments.

Cationic derivative of electrospun non-woven cellulose-chitosan composite fabrics for immobilization of aminoacylase-I

“…10 Less than 1% of WL was observed for the salt-free Cs/Ch-ESNW, which indicated the complete removal of TFA after treatment with 0.1 N NaOH/EtOH. Elemental analysis of the salt-free ESNW revealed that more than 99% of the chitosan was retained after immersion in water, which also supported the complete removal of the TFA.…”

“…10 Briefly, the pre-spun solutions of Cs and Ch in TFA/AcOH were separately prepared. The Cs and Ch solutions were mixed at the weight ratio of Cs : Ch ¼ 4 : 6, and the total concentration of the blend solution was fixed at 4 wt%.…”

“…9 Our recent report on the direct electrospinning of cellulose-chitosan composite ESNWs is promising for the production of composite fibers with average nano-scale diameters. 10 The as-spun Cs/Ch-ESNW in water tends to swell or become distorted into a thin film due to the presence of trifluoroacetic acid (TFA) salts, which were derived from the spinning solvent. An appropriate post-spun treatment is to remove TFA using an alkaline-ethanol solution, which generates a water-resistant Cs/Ch-ESNW.…”

Electrospun Cellulose-Silk Composite Nanofibres Direct Mesenchymal Stem Cell Chondrogenesis in the Absence of Biological Stimulation

“…They were unable to fabricate blends with a higher cellulose content. Furthermore, acetic acid (AcOH) can be incorporated as a cosolvent with TFA to help reduce solution viscosity and enhance solution spinnability and has been used for the electrospinning of cellulose-chitosan composite fibres [15] and as an aqueous solvent for electrospinning cellulose acetate [16] and chitosan nanofibres [17]. It has also been used to control the viscosity of solutions in TFA when casting neat cellulose films [18] and blend films of cellulose and chitosan [19], [20].…”

Impact of Overlapping Collector on Orientated Deposition of Electrospun Nanofibers

“…Electrospinning can fabricate planar and three-dimensional structures by applying polymeric, metallic, ceramic, and organic materials [1][2][3][4]. In laboratories, electrospinning has been widely used to produce composite nanofibers [5], filtering films [6], solar cells [7], microsensors [8], and tissue scaffolds [9].…”