Improved spinnability of PA 6 solutions using AC electrospinning

Kalous, Tomáš; Holec, Pavel; Jirkovec, Radek; Lukáš, David; Chvojka, Jiří

doi:10.1016/j.matlet.2020.128761

Cited by 12 publications

(11 citation statements)

References 15 publications

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“…The acids were added in small doses to the basic solution. The dose of H 2 SO 4 was 0.2 mol/L, and that of CH 3 SO 3 H was 0.37 mol/L [ 28 ]. These values were found to result in the optimal AC electrospinning process.…”

Section: Methodsmentioning

confidence: 99%

“…This area of research is potentially interesting in terms of enhancing the productivity of AC electrospinning. This can be achieved by determining the optimal shape or frequency of the AC signal or via the modification of the electro-spun solution, as described in our previous study [ 28 ]. This paper thus addresses and presents a number of potential approaches to this issue.…”

Section: Introductionmentioning

confidence: 99%

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The Optimization of Alternating Current Electrospun PA 6 Solutions Using a Visual Analysis System

et al. 2021

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The electrospinning process that produces fine nanofibrous materials have a major disadvantage in the area of productivity. However, alternating current (AC) electrospinning might help to solve the problem via the modification of high voltage signal. The aforementioned productivity aspect can be observed via a camera system that focuses on the jet creation area and that measures the average lifespan. The paper describes the optimization of polyamide 6 (PA 6) solutions and demonstrates the change in the behavior of the process following the addition of a minor dose of oxoacid. This addition served to convert the previously unspinnable (using AC) solution to a high-quality electrospinning solution. The visual analysis of the AC electrospinning of polymeric solutions using a high-speed camera and a programmable power source was chosen as the method for the evaluation of the quality of the process. The solutions were exposed to high voltage applying two types of AC signal, i.e., the sine wave and the step change. All the recordings presented in the paper contained two sets of data: firstly, camera recordings that showed the visual expression of electrospinning and, secondly, signal recordings that provided information on the data position in the signal function.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Optimization of Alternating Current Electrospun PA 6 Solutions Using a Visual Analysis System

et al. 2021

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“…This is in line with previous observations from Kalous et al, who reported that the addition of an acid to the PA6 polymeric solution increases its conductivity, which is necessary to allow the formation of a stable fibrous plume during the ACES process. 29 The addition of ~0.2 mol/L of sulfuric acid facilitated the formation of a nanofibrous envelope structure that is shown in Figure 3c,g. It is clear that the nanofibers are completely wound around and uniformly oriented along the core yarn axis, similar to what was observed for the PU and PU-CHX CNYs.…”

Section: Spinnability and Surface Morphology Of Cnysmentioning

confidence: 97%

“…Figure 3e clearly shows that PU nanofibers can be formed by ACES with the employed DMF-based solution, which further expands the polymer range for this method. 20,21,25,26,29,30 The addition of CHX into the PU solution did not impair the electrospinning process, and PU-CHX composite yarns could be prepared under the same spinning condition. The resulting PU-CHX CNY also has an envelope that is completely wound around the PA6 core yarn and that is uniformly oriented along the core yarn axis.…”

Section: Spinnability and Surface Morphology Of Cnysmentioning

confidence: 99%

Composite yarns with antibacterial nanofibrous sheaths produced by collectorless alternating‐current electrospinning for suture applications

Madheswaran

Sivan

Valtera

et al. 2021

J of Applied Polymer Sci

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Fabrication of strong antibacterial composite nanofibrous yarns (CNYs) for suture applications by using common direct current electrospinning has been technologically challenging. In this work, we have demonstrated a more straightforward and facile approach to fabricate chlorhexidine (CHX)containing antibacterial nanofibrous sheaths wounded around a polyamide core yarn using a novel collectorless alternating-current electrospinning approach. Scanning electron microscopy results showed that the nanofibrous envelope was completely wrapped around the core yarn for both polymers, polyurethane, and polyamide 6 (PA6), used in this study. High-performance liquid chromatography after dissolving of the CNYs confirmed the presence of CHX in the yarns, while X-ray photoelectron spectroscopy and Fouriertransform infrared spectroscopy indicated that the amount is relatively low. The tensile properties of all the CNYs were better than of the core yarns and the CHX addition resulted in a lower envelope linear density and envelope adhesion force. Thermal gravimetric analysis showed that all CNYs are thermally stable within the temperature range of interest. Cytocompatibility tests with 3T3-SA mouse fibroblast cells and antibacterial evaluations with Escherichia coli and Staphylococcus aureus showed that the CHX-containing PA6-based CNYs are biocompatible and have antibacterial properties, suggesting that these yarns can be used as functional and mechanically performant sutures.

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“…Currently, there are only a few publications that deal with this technology. In recent publications, several polymers have been spun using AC electrospinning, such as gelatin, 18 polyamide 6, 19 poly(vinyl alcohol), 20 poly(ethylene oxide), 21 polyacrylonitrile, 22 or polycaprolactone, 23 which we have also addressed in this study.…”

Section: Introductionmentioning

confidence: 99%

Preparation of a Composite Scaffold from Polycaprolactone and Hydroxyapatite Particles by Means of Alternating Current Electrospinning

et al. 2021

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This research involved the production of polycaprolactone fiber layers via the alternating current electrospinning method. To construct the micro/nanofiber scaffold, mixtures of two molecular weight solutions, M n 45 000 and M n 80 000, were spun in differing proportions in a solvent system containing acetic acid, formic acid, and acetone in a ratio of 1:1:1. The composite fiber materials with hydroxyapatite particles were prepared from a solution that combined the different molecular weight solutions at a ratio of 1:3. The study resulted in the preparation of fiber layers containing 0, 5, 10, and 15% (wt) hydroxyapatite particles from the dry mass of the polycaprolactone. The strength, wettability, and surface energy of the composite materials were examined, and the results demonstrated that hydroxyapatite affects the fiber diameters, strength, and surface energy and, thus, the wettability of the fiber layers. The fibrous layers produced were further tested for cytotoxicity and cell viability and proliferation. The results obtained thus strongly indicate that the resulting bulky micro/nanofiber layers are suitable for further testing with a view to their eventual application in the field of bone tissue engineering.

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Improved spinnability of PA 6 solutions using AC electrospinning

Cited by 12 publications

References 15 publications

The Optimization of Alternating Current Electrospun PA 6 Solutions Using a Visual Analysis System

The Optimization of Alternating Current Electrospun PA 6 Solutions Using a Visual Analysis System

Composite yarns with antibacterial nanofibrous sheaths produced by collectorless alternating‐current electrospinning for suture applications

Preparation of a Composite Scaffold from Polycaprolactone and Hydroxyapatite Particles by Means of Alternating Current Electrospinning

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