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1

Manufacturing process and characterization of electrospun PVP/ZnO NPs nanofibers

Matysiak W., Tański T., Zaborowska M.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2019

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Vol. 67, nr 2

193--200

EN

Constantly developing nanotechnology provides the possibility of manufacturing nanostructured composites with a polymer matrix doped with ceramic nanoparticles, including ZnO. A specific feature of polymers, i.e. ceramic composite materials, is an amelioration in physical properties for polymer matrix and reinforcement. The aim of the paper was to produce thin fibrous composite mats, reinforced with ZnO nanoparticles and a polyvinylpyrrolidone (PVP) matrix obtained by means of the electrospinning process and then examining the influence of the strength of the reinforcement on the morphology and optical properties of the composite nanofibers. The morphology and structure of the fibrous mats was examined by a scanning electron microscope (SEM) with an energy dispersive spectrometer (EDS) and Fourier-transform infrared spectroscopy (FTIR). UV –Vis spectroscopy allowed to examine the impact of zinc oxide on the optical properties of PVP/ZnO nanofibers and to investigate the width of the energy gap.

2

Fabrication of Pure Electrospun Materials from Hyaluronic Acid

Pabjańczyk-Wlazło E., Krucińska I., Chrzanowski M., Szparaga G., Chaberska A., Kolesińska B., Komisarczyk A., Boguń M.

Fibres & Textiles in Eastern Europe

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2017

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Vol. 25, no. 3 (123)

45--52

EN

The aim of the research was to develop optimal conditions for manufacturing materials based on hyaluronic acid by the electrospun method. The studies were composed of three stages: the process of selection of the optimal solvent (mixture of solvents), the molecular weight of hyaluronic acid, and the concentration of biopolymer in the spinning solution. The influence of variable parameters on the rheological properties of the spinning solutions and electrospinning trails was tested. Depending on the electrospinning regime applied, the fibers obtained were characterised by a diameter of the order of 20 to 400 nm. As a result of the development works presented, an optimal molecular weight of the polymer, its concentration and system of solvents were determined, together with process parameters, ensuring a stable electrospinning process and relatively homogeneous nanofibers. Additionally studies on the residues of solvents used during electrosun formation were done and parameters of drying of the final materials were examined. This approach (verification of the presence of organic solvent residue in the nanofibrous formed) is important for the suitability of nanofibres as scaffolds for regenerative medicine. This study provides an opportunity for the understanding and identification of process parameters, allowing for predictable manufacturing nanofibers based on natural biopolymers, which makes it tremendously beneficial in terms of customisation.

PL

Celem badań było opracowanie optymalnych warunków otrzymywania nanowłókien z kwasu hialuronowego. Badania obejmowały następujące etapy realizacji pracy: proces doboru optymalnego rozpuszczalnika dla polimeru oraz dobór masy cząsteczkowej kwasu hialuronowego. Zbadano właściwości reologiczne roztworów oraz wpływ zmiennych parametrów procesowych na strukturę mikroskopową włókien. W zależności od zastosowanych parametrów elektroprzędzenia otrzymane włókna charakteryzowały się średnią rzędu od 20 do 400 nm. Dodatkowo przeprowadzono badania dotyczące pozostałości rozpuszczalników stosowanych w przygotowaniu roztworów przędzalniczych, co jest istotne z punktu widzenia wykorzystania tych materiałów w obrębie medycyny regeneracyjnej.

3

Synteza nanowłókna z bionanocelulozy (BNC)

Ceynowa P., Wittych J., Rytczak P., Kubiak K., Kołodziejczyk M., Mitura K., Krzewiński S., Symonowicz K., Bielecki S., Mitura S.

Elektronika : konstrukcje, technologie, zastosowania

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2014

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Vol. 55, nr 10

17-18

PL

Celem niniejszej pracy jest przedstawienie nowatorskiej metody wytwarzania nanowłókien z bionanocelulozy (BNC) wykorzystując metodę elektrospinningu.

EN

The purpose of this paper is to present a novel method of producing nanofibers with bionanocellulose (BNC) using the electrospinning method.

4

Simulation of the electrospinning process

Karra S., Srinivasa A. R.

International Journal of Applied Mechanics and Engineering

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2009

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Vol. 14, no 1

175-188

EN

The electrospinning process is modeled and the bending instability of a slender viscoelastic jet is simulated. This is accomplished by modifying the discrete bead model by Reneker et al. (2000). Specifically, the force due to surface tension is incorporated using the expression suggested by Kowalewski et al. (2005) (see Eq.(7)). The results obtained by the use of this modification seem to be in accord with the experimental observations reported in Reneker et al. (2000) (Fig.2). An attempt is also made to simulate the effect of a secondary electric field which could be used to control the electrospinning process and whipping instability. It is observed that the external secondary field considered here, unwinds the jet spirals, reduces the whipping instability and increases the tension in the fiber.