Shear-aided annular needleless electrospinning

Molnár, Kolos

doi:10.1088/2053-1591/ab11fd

Cited by 10 publications

(4 citation statements)

References 26 publications

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“…Consequently, these results confirm that the microalgae-PVA system only adheres to the second hypothesis in the high shear rate regime for electrospinning. In general, shear rates in electrospinning are considered to be relatively high, reaching the range of 10 2 to 10 5 /s, [41][42][43] depending on the experimental setup and materials used. On the other hand, the shear rate obtained with our rotational viscometer was calculated to be 2.5 Â 10 À5 /s.…”

Section: Effects Of Microalgae Addition On the Viscosities And Fiber ...mentioning

confidence: 99%

Photosynthetic nano fibers: Living microalgae packaging into polyvinyl alcohol nanofibers using an electrospinning method

Haraguchi,

Demura,

Kawakita

et al. 2024

J of Applied Polymer Sci

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Although microalgae are often studied for their biochemical extracts, utilizing them in a viable state opens new avenues for sustainable oxygenation in various systems. This study addresses the challenges of maintaining system homeostasis and presents an effective method for immobilizing live microalgae within poly(vinyl alcohol) (PVA) nanofibers using electrospinning technology. Characterization techniques, including scanning electron microscopy (SEM), fluorescence microscopy, Fourier‐transform infrared (FTIR) spectroscopy, and differential scanning calorimetry (DSC), were used to validate successful immobilization. Rheological studies were performed to investigate the influence of microalgae on the fiber morphology. Changing the PVA concentration, the fiber diameter could be regulated between 150 and 650 nm in the spinnable range. The addition of microalgae to the solution increased the viscosity of the prepared solution and reduced the resulting fiber diameter by approximately 2/3. Our results show that PVA nanofibers effectively encapsulate living microalgae and allow for sustained transport of nutrients and metabolites. The photosynthetic efficacy of the encapsulated microalgae was evaluated using dissolved oxygen measurements and showed two times higher rates of oxygen production and consumption compared with a film‐based approach. Our results show that PVA nanofibers effectively encapsulated living microalgae and allowed for the sustained transport of nutrients and metabolites. This innovative methodology provides a robust platform for immobilizing living microorganisms, with broad implications for applications ranging from regenerative medicine to sustainable agriculture.

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Section: Effects Of Microalgae Addition On the Viscosities And Fiber ...mentioning

confidence: 99%

Photosynthetic nano fibers: Living microalgae packaging into polyvinyl alcohol nanofibers using an electrospinning method

Haraguchi,

Demura,

Kawakita

et al. 2024

J of Applied Polymer Sci

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“…It is well known that the electric field can influence these parameters [ 13 , 14 , 15 ], so that it can be expected that large nanofibrous membranes spun in a needleless process will have other physical properties at the borders, compared to the middle. Nevertheless, these variations along large nanofiber mats are only scarcely reported in the literature [ 10 , 16 , 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Homogeneity of Needleless Electrospun Nanofiber Mats

Morina,

Dotter,

Döpke

et al. 2023

Nanomaterials

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Nanofiber mats can be electrospun by different techniques, usually subdivided into needle-based and needleless. The latter allow for producing large-area nanofiber mats, e.g., with a width of 50 cm and lengths of several meters, if electrospinning proceeds for several hours, depending on the required thickness. Even spinning smaller samples, however, raises the question of homogeneity, especially if defined mechanical properties or a defined thickness is required, e.g., for filtration purposes. Very often, only the inner parts of such electrospun nanofiber mats are used to avoid too high variation of the nanofiber mat thickness. For this study, we used wire-based electrospinning to prepare nanofiber mats with slightly varying spinning parameters. We report investigations of the thickness and mass per unit area, measured on different positions of needleless electrospun nanofiber mats. Martindale abrasion tests on different positions are added as a measure of the mechanical properties. All nanofiber mats show unexpectedly strong variations of thickness, mass per unit area, and porosity, as calculated from the apparent density of the membranes. The thickness especially varied by nearly one order of magnitude within one sample, while the apparent density, as the most uniform parameter, still showed variations by more than a factor of two within one sample. This shows that even for apparently highly homogeneous areas of such nanofiber mats, variations cannot be neglected for all potential applications.

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“…In recent years, our research group developed the annular spinneret, reducing solvent volatilization and making use of polymer solution [29,30]. Molnar used a shear-aided annular needleless electrospinning method to generate nanofibers, and the shearing effect could decrease the shear-thinning solution, which made it easy to form jet initiation [31]. These research works provided some novel ideas for further study to improve the optimization of the needleless electrospinning spinneret.…”

Section: Introductionmentioning

confidence: 99%

Multiple-Jet Needleless Electrospinning Approach via a Linear Flume Spinneret

et al. 2019

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There is a great limitation to improving the quality and productivity of nanofibers through the conventional single-needle method. Using needleless electrospinning technology to generate multiple jets and enhance the productivity of nanofibers has attracted lots of interest for many years. This study develops a novel linear flume spinneret to fabricate nanofibers. Multiple jets with two rows can be formed simultaneously on the surface of the spinneret. The solution concentration has a significant impact on the average nanofiber diameter compared with applied voltage and collection distance. The effects of different spinning process parameters on the productivity of nanofibers are investigated. High-quality nanofibers with small nanofiber diameter and error can be fabricated successfully. The average nanofiber diameter is 108 ± 26 nm. The average error is 24%. The productivity of nanofibers can reach 4.85 ± 0.36 g/h, which is about 24 times more than that of the single-needle method. This novel linear flume spinneret needleless electrospinning technology exhibits huge potential for mass production of nanofibers in the field of industrialization.

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Shear-aided annular needleless electrospinning

Cited by 10 publications

References 26 publications

Photosynthetic nano fibers: Living microalgae packaging into polyvinyl alcohol nanofibers using an electrospinning method

Photosynthetic nano fibers: Living microalgae packaging into polyvinyl alcohol nanofibers using an electrospinning method

Homogeneity of Needleless Electrospun Nanofiber Mats

Multiple-Jet Needleless Electrospinning Approach via a Linear Flume Spinneret

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