Alternating current electrospinning: The impacts of various high-voltage signal shapes and frequencies on the spinnability and productivity of polycaprolactone nanofibers

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46747885%3A24210%2F22%3A00009077" target="_blank" >RIV/46747885:24210/22:00009077 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/46747885:24410/22:00009077 RIV/46747885:24510/22:00009077

Výsledek na webu

<a href="https://api.elsevier.com/content/article/eid/1-s2.0-S0264127521008637" target="_blank" >https://api.elsevier.com/content/article/eid/1-s2.0-S0264127521008637</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.matdes.2021.110308" target="_blank" >10.1016/j.matdes.2021.110308</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Alternating current electrospinning: The impacts of various high-voltage signal shapes and frequencies on the spinnability and productivity of polycaprolactone nanofibers

Popis výsledku v původním jazyce

The paper presents a discussion on the factors that influence the spinnability, morphology, fiber diameter and productivity of PCL ENF with respect to two specific aspects, i.e. the waveform and the frequency of the AC high-voltage signal applied. In summary, the study revealed that the waveform and the frequency comprise additional technological parameters with respect to the AC spinnability and the productivity of PCL ENF. The waveform strongly influences the formation of a stable fibrous plume. For example, the square and sine waveforms created plumes at 10 Hz. In contrast, the triangle waveform acted to inhibit spinnability at 10 Hz since it required more time to attain the critical voltage and the switching of the voltage polarity. The waveform exerts a significant impact on the morphological features of PCL ENF. In addition, various fiber diameter distributions were determined as a function of the waveform and applied frequency. The triangle and sine waveforms (with the exception of 50 and 30 Hz) can be used for the fabrication of smooth fibers without the presence of beads or spindles. The production of a trimodal fibrous morphology consisting of beads, spindle and helical fibers is possible via the application of the square waveform. The minimum and maximum mean fiber diameters (0.34 ± 0.2 and 2.05 ± 1.9) μm were obtained for the square and triangle waveforms at 30 Hz and 60 Hz, respectively. Higher frequency waveforms encouraged the formation of thicker fibers. All the 50 Hz waveforms evinced the three-fold higher mass production of nanofibers than did lower frequencies (10 or 20 Hz). The square waveform exhibited the highest productivity (23.6 ± 0.4) g/h followed by the sine (16.5 ± 0.3) g/h and the triangle (6.9 ± 0.2) g/h waveforms at 50 Hz. In addition, the original chemical structure of the PCL was not influenced by either the waveform or the frequency. The square waveform at 50 Hz thus comprises a high throughput technological parameter concerning PCL. Attaining a high PCL ENF production rate as a function of the waveform and frequency of the AC high-voltage signal represents a breakthrough in the field of electrospinning technology, and the attainment of various fiber morphologies and fiber diameter distributions comprised additional advantages. The study presented herein will be extended in the future so as to include the study of the effects of the waveform and frequency on the physico-chemical and mechanical properties of PCL ENF. Since there is no requirement for an electrically-active collector, the electrospun fibers can be deposited on any type of substrate. For instance, they can be deposited on classic yarns so as to produce a core-nanofibrous sheath structure at the industrial scale, a process that is extremely technologically challenging via the application of the standard DC electrospinning technique.

Název v anglickém jazyce

Alternating current electrospinning: The impacts of various high-voltage signal shapes and frequencies on the spinnability and productivity of polycaprolactone nanofibers

Popis výsledku anglicky

The paper presents a discussion on the factors that influence the spinnability, morphology, fiber diameter and productivity of PCL ENF with respect to two specific aspects, i.e. the waveform and the frequency of the AC high-voltage signal applied. In summary, the study revealed that the waveform and the frequency comprise additional technological parameters with respect to the AC spinnability and the productivity of PCL ENF. The waveform strongly influences the formation of a stable fibrous plume. For example, the square and sine waveforms created plumes at 10 Hz. In contrast, the triangle waveform acted to inhibit spinnability at 10 Hz since it required more time to attain the critical voltage and the switching of the voltage polarity. The waveform exerts a significant impact on the morphological features of PCL ENF. In addition, various fiber diameter distributions were determined as a function of the waveform and applied frequency. The triangle and sine waveforms (with the exception of 50 and 30 Hz) can be used for the fabrication of smooth fibers without the presence of beads or spindles. The production of a trimodal fibrous morphology consisting of beads, spindle and helical fibers is possible via the application of the square waveform. The minimum and maximum mean fiber diameters (0.34 ± 0.2 and 2.05 ± 1.9) μm were obtained for the square and triangle waveforms at 30 Hz and 60 Hz, respectively. Higher frequency waveforms encouraged the formation of thicker fibers. All the 50 Hz waveforms evinced the three-fold higher mass production of nanofibers than did lower frequencies (10 or 20 Hz). The square waveform exhibited the highest productivity (23.6 ± 0.4) g/h followed by the sine (16.5 ± 0.3) g/h and the triangle (6.9 ± 0.2) g/h waveforms at 50 Hz. In addition, the original chemical structure of the PCL was not influenced by either the waveform or the frequency. The square waveform at 50 Hz thus comprises a high throughput technological parameter concerning PCL. Attaining a high PCL ENF production rate as a function of the waveform and frequency of the AC high-voltage signal represents a breakthrough in the field of electrospinning technology, and the attainment of various fiber morphologies and fiber diameter distributions comprised additional advantages. The study presented herein will be extended in the future so as to include the study of the effects of the waveform and frequency on the physico-chemical and mechanical properties of PCL ENF. Since there is no requirement for an electrically-active collector, the electrospun fibers can be deposited on any type of substrate. For instance, they can be deposited on classic yarns so as to produce a core-nanofibrous sheath structure at the industrial scale, a process that is extremely technologically challenging via the application of the standard DC electrospinning technique.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20500 - Materials engineering

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Materials & Design

ISSN

0264-1275

e-ISSN

—

Svazek periodika

213

Číslo periodika v rámci svazku

January

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

—

Kód UT WoS článku

000734388700002

EID výsledku v databázi Scopus

2-s2.0-85120959892