Effect of viscoelasticity in polymer nanofiber electrospinning: Simulation using FENE-CR model

Akkoyun, Şerife; Öktem, Nuray

doi:10.1016/j.jestch.2020.12.017

Cited by 10 publications

(20 citation statements)

References 46 publications

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“…A high voltage is then applied between the nozzle and the grounded drum collector, and the resulting electric field generates a charge on the liquid surface. As the applied voltage increases, a repulsive electric force opposite the surface tension appears, forming a conical shape known as a Taylor cone at the tip of the needle 17–19 . The solution emerges from a jet in two stages (i): stretching jet, which is conducted by an applied voltage, and (ii) the whipping instability, which is primarily caused by Coulomb force 17–19 .…”

Section: Introductionmentioning

confidence: 99%

“…As the applied voltage increases, a repulsive electric force opposite the surface tension appears, forming a conical shape known as a Taylor cone at the tip of the needle. [17][18][19] The solution emerges from a jet in two stages (i): stretching jet, which is conducted by an applied voltage, and (ii) the whipping instability, which is primarily caused by Coulomb force. [17][18][19] The repulsion exceeds the surface tension and stretches the polymer droplet into the Taylor cone.…”

Section: Introductionmentioning

confidence: 99%

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Effects of applied voltage on the morphology and phases of electrospun poly(vinylidene difluoride) nanofibers

Nugraha

Chou

et al. 2022

Polymer International

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Electrospinning is a simple and flexible process in continuous fiber fabrication. We investigate the effect of applied voltage on morphology and phases of poly(vinylidene difluoride) nanofibers obtained using the electrospinning technique. Quantitative and qualitative analyses were performed employing multiple characterizations such as Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). The fiber diameter, affected by the spinning jet's deformation, has non-uniform distribution at low voltages (10-16 kV) and is uniform at higher voltages (20 kV). Fiber uniformity developed due to the increased tension, which shrank the Taylor cone. The highest electroactive fraction (F EA ) of phases was obtained for the smallest diameter fiber with an average diameter of 110 nm at an applied voltage of 20 kV. FTIR spectroscopy and XRD results indicate that the electric field raises the amount of F EA phase to 74% at the present working parameters. HRTEM analysis revealed that the crystallites are very small, with ⊍-phase showing a size of around 10 nm and ⊎-phase is only of nanometric scale. Results also show that the c-axis of ⊍-phase crystallites had a preferred orientation along the fiber axis. On the other hand, the c-axis of ⊎-phase had a preferred orientation perpendicular to the fiber axis, implying that the direction of crystal growth for the ⊍-phase and ⊎-phase was different.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of applied voltage on the morphology and phases of electrospun poly(vinylidene difluoride) nanofibers

Nugraha

Chou

et al. 2022

Polymer International

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“…Actually, this evolution is closely related to the concentration regimes of the polymer solutions but also to the thinning dynamics of the nanofibers. The morphology of the nanofibers is directly associated to the concentration regimes of the polymer solution but also to the polymer chain dynamics 44 . Nanofiber formation occurs when the polymer solution is in a semidilute regime.…”

Section: Resultsmentioning

confidence: 99%

“…The spinneret used was a needle with inner and outer diameters of 0.813 and 0.495 mm, respectively. The process parameters were a feed rate of 0.25 ml/h, a tip‐to‐collector distance of 14 cm and a voltage of 20 kV 44 . All the nanofibers were collected on a glass substrate of approximately 2 x 2 cm placed on the grounded metallic collector and labeled as PA12, PA14, PA16 and PA18.…”

Section: Methodsmentioning

confidence: 99%

“…The morphology of the nanofibers is directly associated to the concentration regimes of the polymer solution but also to the polymer chain dynamics. 44 Nanofiber formation occurs when the polymer solution is in a semidilute regime. Therefore, it is important to identify the overlap concentration c* corresponding to the boundary between dilute and semidilute regime.…”

Section: Morphological Analysismentioning

confidence: 99%

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Morphology, defects and polymer concentration related nonlinear absorption and optical limiting properties of electrospun polyamide 6 nanofibers

Pepe

Akkoyun

Karatay

et al. 2022

J of Applied Polymer Sci

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The effects of morphology, defects and polymer concentration on nonlinear absorption characteristics of electrospun polyamide 6 (PA 6) nanofibers were studied systematically. Scanning electron microscopy measurements showed that a deviation from uniform nanofibers to irregular cob-web nanofibers morphology occurred with increasing PA 6 concentration and fiber diameter. Open aperture Z-scan results indicated that the thinner uniform PA 6 nanofibers present higher nonlinear absorption. This observation is mainly attributed to a greatest light scattering for thicker uniform nanofibers, considering the linear optical analysis of the PA 6 nanofibers. As a secondary factor, this could be associated with defect state distribution within the band gap, which facilitates the contribution of two photon absorption (TPA) and free carrier absorption (FCA) to nonlinear absorption. Moreover, the thinner uniform nanofibers exhibit higher optical limiting behavior. Polyamide 6 nanofibers attract more attention for biomedical applications due to their good biocompatibility. However, to our knowledge, no study exists on PA 6 nanofibers nonlinear optical properties and their dependency on nanofiber morphology. Therefore, in line with the reported results, this report reveals that PA 6 nanofibers are a promising material for optoelectronic applications as well as biomedical applications.

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Formation, structure, and morphology of nanofiber mat on the base sodium‐carboxymethylcellulose/polyvinyl‐alcohol/silver nanoparticles composite

Ergashovich,

Abdupatto O'g'li,

Shodievich

et al. 2024

Polymers for Advanced Techs

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Stable silver nanoparticles were synthesized in solutions containing sodium‐carboxymethylcellulose and polyvinyl alcohol, and their structure, morphology, and physicochemical properties were studied. The morphology and diameter sizes of the nanofibers of carboxymethylcellulose/polyvinyl alcohol containing silver nanoparticles were investigated using atomic force microscopy and scanning electron microscopy. The investigations showed that nanofibers with diameter sizes ranging from 50 to 130 nm were obtained from the carboxymethylcellulose/polyvinyl alcohol/silver nanoparticles solution. The size and form of silver nanoparticles formed within the solution of carboxymethylcellulose/polyvinyl alcohol based on nanofiber were determined by X‐ray diffraction (XRD), UV–visible (UV–VIS) spectroscopy, and dynamic light scattering (DLS) investigations, revealing nanoparticles with diameters ranging from 5 to 26 nm. The nanofiber mat containing silver nanoparticles exhibited significant antimicrobial activity against both Staphylococcus epidermidis and Candida albicans. The nanofiber mat containing stable silver nanoparticles could be utilized as an antimicrobial facemask for air filtration and for the treatment of burn wounds.

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Effect of viscoelasticity in polymer nanofiber electrospinning: Simulation using FENE-CR model

Cited by 10 publications

References 46 publications

Effects of applied voltage on the morphology and phases of electrospun poly(vinylidene difluoride) nanofibers

Effects of applied voltage on the morphology and phases of electrospun poly(vinylidene difluoride) nanofibers

Morphology, defects and polymer concentration related nonlinear absorption and optical limiting properties of electrospun polyamide 6 nanofibers

Formation, structure, and morphology of nanofiber mat on the base sodium‐carboxymethylcellulose/polyvinyl‐alcohol/silver nanoparticles composite

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