An investigation on the effects of twist on geometry of the electrospinning triangle and polyamide 66 nanofiber yarn strength

Hajiani, F.; Jeddi, Ali Asghar Asgharian; Gharehaghaji, Ali Akbar

doi:10.1007/s12221-012-0244-3

Cited by 61 publications

(56 citation statements)

References 61 publications

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“…The inner core of the scaffold, composed the aligned nanofiber microstrands, was prepared by using a water vortex electrospinning system . Then, the microstrands were covered by a nanorough surface outer sheath in a two−nozzle electrospinning system . Both electrospinning systems have been already designed and employed by our research team …”

Section: Methodsmentioning

confidence: 99%

Promotion of spinal cord axon regeneration by 3D nanofibrous core–sheath scaffolds

Zamani

Tehran

Latifi

et al. 2013

J Biomedical Materials Res

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Since spinal cord injury is a complicated problem, neural tissue repair, and regeneration strategies have received a great deal of attention. In this study, a three-dimensional (3D) nanofibrous core-sheath scaffold with nanorough sheath and aligned core were fabricated by a combined electrospinning method with water vortex and two-nozzle system. In vitro and in vivo biological tests were carried out on the poly(lactic-co-glycolic acid) (PLGA) scaffolds. The cell morphology and proliferation evaluation of nerve cells on 3D PLGA scaffolds were studied. Cells were properly orientated along the aligned fiber direction of the scaffold. In animal studies, adult rats received a complete lateral hemisection at the T9-T10 level. Scaffolds were engrafted to bridge 3 mm defects of 10 adult rat spinal cords; 10 rats were used as controls. For 8 weeks, motor and sensory recovery by open field locomotor scale, narrow beam and tail flick tests were assessed. Locomotor and sensory scores of grafted animals were significantly better than the control group. Histological findings demonstrated that the scaffold supports the axonal regeneration of injured spinal cords and regenerating axons were seen to enter the graft and extend along its length.

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Section: Methodsmentioning

confidence: 99%

Promotion of spinal cord axon regeneration by 3D nanofibrous core–sheath scaffolds

Zamani

Tehran

Latifi

et al. 2013

J Biomedical Materials Res

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“…Most electrospun nanofibers are collected in the form of nonwoven webs [7]. However, nanofiber webs are deficient in mechanical strength due to the random orientations of the nanofibers [8,9], which limits their application in areas such as artificial organs and protective clothing [10,11]. Nanofiber filaments or yarns are expected to be one of the best approaches to solve this problem and uncover new opportunities for the development of 3D nanofibrous structures [10,12].…”

Section: Introductionmentioning

confidence: 99%

Nanofiber Filaments Fabricated by a Liquid-Bath Electrospinning Method

Tian¹,

Yan²,

Li³

et al. 2018

Novel Aspects of Nanofibers

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In order to investigate the forming process of multi-needle liquid-bath electrospun nanofiber filaments, nanofiber filaments were prepared using the multi-needle liquidbath electrospinning method in this chapter. The effect of auxiliary electrode on jet state, and bundling and drawing processes of nanofibers were studied. The results show that the forming process of nanofiber filaments was mainly influenced by electrostatic field interference, bundling process, and drawing process, including two processes: forming process of as-spun nanofiber filaments and post-drawing process. In the forming process of as-spun nanofiber filaments, when the auxiliary electrode was added, the electrostatic field interference between needles reduced, inducing the decrease of jet offsets and the enhancement of Taylor cone and jet stability, and nanofibers with skin-core structure were finally deposited on the bath in good condition. The bundling process of nanofiber filament was divided into three processes: wet process, wet-dry process, and dry process; the structure transformation of nanofiber filaments mainly occurred in the wet process. In the post-drawing process, the crystallinity and alignment degree of nanofibers increased, and nanofiber diameter decreased. The initial modulus and breaking stress of filaments increased while the breaking strain of filaments decreased. Finally, nanofiber filaments were produced with better structures and properties.

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“…In some instances, twisting nanofibre bundles (Fennessey & Farris, 2004;He, Huang, & Han, 2009) or strip cut nanofibre webs (Uddin, Ko, Xiong, Farouk, & Capaldi, 2009;Zhou, Fang, Wang, & Lin, 2012) after electrospinning have been reported. Continuous nanofibre yarns have also been produced by direct electrospinning using liquid bath (Khil, Bhattarai, Kim, Kim, & Lee, 2005;Smit, Bűttner, & Sanderson, 2005;Teo, Gopal, Ramaseshan, Fujihara, & Ramakrishna, 2007;Yousefzadeh, Latifi, Teo, Amani-Tehran, & Ramakrishna, 2011), solid surface (Dabirian & Hosseini, 2009;Dabirian, Hosseini, & Hosseini Ravandi, 2007;Dabirian, Ravandi, Sanatgar, & Hinestroza, 2011;Hajiani, Jeddi, & Gharehaghaji, 2012), and funnel or tube Ali, Zhou, Wang, & Lin, 2012;He, Qi, Zhou, & Cui, 2014) as collector.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, a few groups have reported the preparation of nanofibre yarns using a solid surface collector (Dabirian & Hosseini, 2009;Dabirian et al, 2007Dabirian et al, , 2011Hajiani et al, 2012). Nanofibre yarns prepared show enhanced mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Direct electrospinning of nanofibre yarns using a rotating ring collector

Shuakat

Lin

2015

The Journal of The Textile Institute

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Nanofibres prepared by electrospinning typically have randomly oriented fibrous structure. They have large surface-tovolume (or weight) ratio and excellent porous characteristic, which have shown enormous potential in diverse applications. However, electrospun nanofibres are often prepared in the form of randomly orientated fibrous web, which are fragile and difficult to be tailored in fibrous structures. Herein, we demonstrate a novel yarn electrospinning method which uses a rotating ring collector to convert newly electrospun nanofibres directly into a continuous yarn. The use of ring collector separates the yarn formation from the electrospinning zone. The deposition of later-spun nanofibres to the inner surface of fibrous cone eliminates hooked or curled nanofibres in the final yarn. The effects of polymer concentration and operating parameters on nanofibre and yarn morphology, diameter and the ring collector on yarn twist feature were examined. The nanofibre yarns had a surface twist angle up to 54.4°, and tensile strength as high as 93.6 MPa (elongation at break 242.6%). Increasing twist levels improves tensile strength and strain values.

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An investigation on the effects of twist on geometry of the electrospinning triangle and polyamide 66 nanofiber yarn strength

Cited by 61 publications

References 61 publications

Promotion of spinal cord axon regeneration by 3D nanofibrous core–sheath scaffolds

Promotion of spinal cord axon regeneration by 3D nanofibrous core–sheath scaffolds

Nanofiber Filaments Fabricated by a Liquid-Bath Electrospinning Method

Direct electrospinning of nanofibre yarns using a rotating ring collector

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