Cellulose-based electrospun nanofibers: a review

Abstract

Cellulosic materials have gained a lot of attention in the last decades because of their abundancy, renewability and excellent physicochemical properties. Meanwhile, research on nanofibers has also been increasing with the aim of producing or modifying materials that can have a wide range of applications, such as tissue engineering, drug delivery, protective clothing and wound dressing. In order to produce these fibers, electrospinning is shown to be a promising and extensively used technique. Electrospun cellulosic fibers maintain the optimal characteristics of cellulose while improving its surface area to volume ratio and mechanical properties, in addition to the possibility of surface tailoring of bulk materials. However, there are several limitations related to the utilization of cellulose and most of its derivatives with the electrospinning technique. Poor solubility in most common solvents and inability to melt are major drawbacks. Thus, this review describes mostly recent research in which cellulose and its derivatives have been the feedstock for fabrication of nanofibers by electrospinning, exploring processing details and potential applications.

A Forest‐Based Triboelectric Energy Harvester

“…Currently, electrospinning is finding applications in different areas such as healthcare and air filtration but also triboelectric nanogenerators. [41,42] The device stack is depicted in Figure 1a, where lignin and nitrocellulose (NC) fiber mats constitute the positive and negative triboelectric layers, respectively, while graphitized lignin fiber mats placed on the outer sides of the device act as electrodes. NC is typically formed by treating cellulose fibers with a mixture of sulfuric and nitric acids, resulting in the substitution of hydroxyl groups with nitrate groups (Figure 1b).…”

An Overview of Recent Progress in Nanofiber Membranes for Oily Wastewater Treatment

“… Various types of nanofiber production techniques. ( a ) Needle electrospinning, reproduced with permission from [ 21 ], copyright 2021 Springer Nature; ( b ) needleless electrospinning, reproduced with permission from [ 22 ], copyright 2021 Elsevier; ( c ) melt-blowing, reproduced with permission from [ 23 ], copyright 2013 Elsevier; ( d ) melt-blending, reproduced with [ 24 ], ( e ) drawing, reproduced with permission from [ 25 ], copyright 2014 Taylor & Francis; ( f ) centrifugal force spinning, reproduced with permission from [ 26 ], copyright 2018 Springer Nature; ( g ) phase separation, reproduced with permission from [ 25 ], copyright 2014 Taylor & Francis; ( h ) template synthesis, reproduced with permission from [ 25 ], copyright 2014 Taylor & Francis; and ( i ) self-assembly, reproduced with permission from [ 25 ], copyright 2014 Taylor & Francis. …”

Influência da tensão e da distância de trabalho na produção de nanofibras de acetato de celulose para aplicação em Engenharia de Tecidos

“…Essa discrepância provavelmente está associada ao uso de uma agulha com diâmetro interno maior (0,80 mm) por esses autores o que propiciou a produção de fibras com maiores diâmetros médios. Ademais, observa-se que para uma distância de trabalho fixa, o aumento da tensão elétrica aplicada ocasiona diminuição do diâmetro médio das nanofibras de AC, conforme descrito anteriormente na literatura [39][40][41][42]. Este comportamento pode ser explicado pela elevação das forças eletrostáticas e da densidade de cargas devido ao aumento da tensão, o que acelera o jato do polímero, causando assim um estreitamento do diâmetro da fibra [39][40][41][42].…”

“…Inúmeros trabalhos na literatura versam sobre a produção de mantas de nanofibras de acetato de celulose (NFAC) pelo método de eletrofiação utilizando diferentes parâmetros de processamento, tais como o uso de diversos solventes e misturas desses, diferentes concentrações da solução polimérica [32][33][34][35][36][37][38], tensões elétricas aplicadas e distâncias de trabalho [39][40][41][42]. Em relação à influência do solvente e da concentração polimérica na estrutura morfológica das nanofibras de AC pode-se destacar o trabalho de TUNGPRAPA et al [35].…”