Electrospinning of Gelatin/Poly (Vinyl Pyrrolidone) Blends from Water/Acetic Acid Solutions

Salles, Taís Helena Costa; Lombello, Christiane Bertachini; d’Ávila, Marcos Akira

doi:10.1590/1516-1439.310114

Cited by 67 publications

(42 citation statements)

References 38 publications

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“…The initial weight loss at temperature of less than 150 °C was due to the evaporation of solvent and any moisture from the nanofibre. This result is similar to the findings of Kim et al [52] and Sales et al [53]. At the temperature range from 373 °C to 466 °C, another significant weight loss of 71.5% was detected in the graph, which is associated with the thermal decomposition of the main chain PVP polymer [52].…”

Section: Resultssupporting

confidence: 91%

Hydrogen Sorption of Magnesium Oxide Carbon Nanofibre Composite

Khafidz

Yaakob²,

Timmiati³

et al. 2019

MJAS

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Carbon nanofibres have high specific surface area to adsorb hydrogen on their surface and are widely investigated for hydrogen storage. Although carbon nanofibres can store a considerable amount of hydrogen, the adsorption of the latter must be conducted at cryogenic conditions. Here, MgO is proposed as a catalyst to improve the hydrogen storage performance of carbon nanofibres at room temperature because of the light weight MgO and its ability to dissociate hydrogen molecules. The magnesium oxidecarbon nanofibre (MgO-CNF) composite was prepared with polivinylpyrrolidone polymer and MgO via an electrospinner. The samples were characterised with field emission scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry and microgravimetric analysis. The MgO particles were formed on the surface and embedded inside the MgO-CNFs, thereby increasing the specific surface area. The assynthesised MgO-CNFs with a specific surface area of 547 m 2 /g can store 2.54 wt.% of hydrogen at room temperature, showing more than 30% improvement as compared with that of CNFs.

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Section: Resultssupporting

confidence: 91%

Hydrogen Sorption of Magnesium Oxide Carbon Nanofibre Composite

Khafidz

Yaakob²,

Timmiati³

et al. 2019

MJAS

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“…We observed that only mats produced from 17% w/w aqueous PVP had acceptable reproducibility, with mats formed by smooth fibres (Figure 1(a)) of well-defined size distribution with an average fibre size of 290 ± 50 nm (Figure 1(g,h)). Indeed, the rheological measurements indicated that 17% w/w PVP solution (Figure 1(f)) has sufficiently high viscosity (η) at the shear rates that match flow rates used during electrospinning process, and agrees with values reported by others [41]. Furthermore, it can be seen that the 17% PVP solution exhibits shear-thinning behaviour in the used shear rate regime (1-100 s -1 ), which is a critical condition for higher-viscosity solutions to be electrospun [42].…”

Section: Resultssupporting

confidence: 89%

UV cross-linked polyvinylpyrrolidone electrospun fibres as antibacterial surfaces

Maciejewska

Wychowaniec

Woźniak-Budych

et al. 2019

Science and Technology of Advanced Materials

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Many bacteria become progressively more resistant to antibiotics and it remains a challenging task to control their overall levels. Polymers combined with active biomolecules come to the forefront for the design of antibacterial materials that can address this encounter. In this work, we investigated the photo-crosslinking approach of UV-sensitive benzophenone molecule (BP) with polyvinylpyrrolidone (PVP) polymer within electrospun fibres. The BP and PVP solutions allowed fabricating polymer mats that were subsequently functionalised with antibacterial lysozyme. The physical properties of the crosslinked electrospun fibres were investigated by scanning electron microscopy and atomic force microscopy. The average diameter of the obtained fibres decreased from 290 ± 50 nm to 270 ± 70 nm upon the addition of the crosslinking molecules and then to 240 ± 80 nm and 180 ± 90 nm after subsequent crosslinking reaction at an increasing time: 3 and 5 h, respectively. The peak force quantitative nanomechanical mapping (PF-QNM) indicated the increase of DMT modulus of obtained cross-linked fibres from 4.1 ± 0.8 GPa to 7.2 ± 0.5 GPa. Furthermore, the successful crosslinking reaction of PVP and BP solution into hydrogels was investigated in terms of examining photo-crosslinking mechanism and was confirmed by rheology, Raman, Fourier transform infrared and nuclear magnetic resonance. Finally, lysozyme was successfully encapsulated within cross-linked PVP-BP hydrogels and these were successfully electrospun into mats which were found to be as effective antibacterial agents as pure lysozyme molecules. The dissolution rate of photo cross-linked PVP mats was observed to increase in comparison to pure PVP electrospun mats which opened a potential route for their use as antibacterial, on-demand, dissolvable coatings for various biomedical applications.

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“…These improved properties were attributed to the electrostatic interaction and hydrogen bonding between the amino polysaccharide and gelatin [ 54 , 55 ]. Foam [ 56 ], 3D printed substrates [ 57 , 58 ], electrospinning [ 59 ], phase separation [ 60 ], porogen leaching [ 61 ], freeze-drying [ 62 ] and textile structures [ 63 ] are methods that have been used to prepare scaffolds from biodegradable blends or composites, for biomedical applications.…”

Section: Introductionmentioning

confidence: 99%

Novel Blend for Producing Porous Chitosan-Based Films Suitable for Biomedical Applications

Nady

Kandil

2018

Membranes

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In this work, a chitosan–gelatin–ferulic acid blend was used in different ratios for preparing novel films that can be used in biomedical applications. Both acetic and formic acid were tested as solvents for the chitosan–gelatin–ferulic acid blend. Glycerol was tested as a plasticizer. The thickness, mechanical strength, static water contact angle and water uptake of the prepared films were determined. Also, the prepared films were characterized using different analysis techniques such as Fourier transform infrared spectroscopy (FT-IR) analysis, X-ray diffraction (XRD), thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). Acetic acid produced continuous compact surfaces that are not recommended for testing in biomedical applications. The plasticized chitosan–gelatin–ferulic acid blend, using formic acid solvent, produced novel hexagonal porous films with a pore size of around 10–14 µm. This blend is recommended for preparing films (scaffolds) for testing in biomedical applications as it has the advantage of a decreased thickness.

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Electrospinning of Gelatin/Poly (Vinyl Pyrrolidone) Blends from Water/Acetic Acid Solutions

Cited by 67 publications

References 38 publications

Hydrogen Sorption of Magnesium Oxide Carbon Nanofibre Composite

Hydrogen Sorption of Magnesium Oxide Carbon Nanofibre Composite

UV cross-linked polyvinylpyrrolidone electrospun fibres as antibacterial surfaces

Novel Blend for Producing Porous Chitosan-Based Films Suitable for Biomedical Applications

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