Development and characterization of highly oriented PAN nanofiber

Sadrjahani, Mehdi; Hoseini, Sayed Ali; Mottaghitalab, Vahid; Haghi, A. K.

doi:10.1590/s0104-66322010000400010

Cited by 24 publications

(17 citation statements)

References 10 publications

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“…SEM analysis of fibrous scaffolds by incorporating different image analysis methods is one of the renown methods for researchers to measure porosity parameters of woven fabric,41 nonwoven and membranes,37 and nanofiber scaffolds 38, 42–44. Although image processing of SEM micrographs for geometrical characterization is useful for measuring total porosity, pore shape, pore size and pore size distribution of relatively thin nonwovens, it cannot be applied to multilayer electrospun fibrous scaffolds.…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional pore structure analysis of Nano/Microfibrous scaffolds using confocal laser scanning microscopy

Bagherzadeh

Latifi

Najar

et al. 2012

J Biomedical Materials Res

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Specific internal pore architectures are required to provide the needed biological and biophysical functions for fibrous scaffolds as these architectures are critical to cell infiltration and in-grows performance. However, the key challenging on evaluating 3D pore structure of fibrous scaffolds for better understanding the capability of different structures for biological application is not well investigated. This article reports a fast, accurate, nondestructive, and comprehensive evaluation approach based on confocal laser scanning microscopy (CLSM) and three-dimensional image analysis to study the pore structure and porosity parameters of Nano/Microfibrous scaffolds. Also a new method of making the fiber fluorescent using quantum dots (QDs) was applied before 3D imaging. Fibrous scaffolds with different porosity parameters produced by electrospinning and their 3D-pore structure was evaluated by this approach and the results were compared to results of capillary flow porometry. The pore structural properties measured in this approach are in good agreement with that measured by the capillary flow porometry (with significant level 0.05). Furthermore, the introduced approach can measure the pore interconnectivity of the scaffold.

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Section: Introductionmentioning

confidence: 99%

Three‐dimensional pore structure analysis of Nano/Microfibrous scaffolds using confocal laser scanning microscopy

Bagherzadeh

Latifi

Najar

et al. 2012

J Biomedical Materials Res

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“…The higher the temperature and the greater the applied force, the higher the molecular chain orientation, resulting in higher tenacity and modulus for the fibers 6, 7, 8, 13. Whereas nanofibers were collected under tension and heated at over T g temperature in present work and by considering the strong and direct relation obtained between stress and molecular orientation parameter at previous study,12 it seems that the improvement of molecular chain orientation in the direction of nanofiber axis has had positive role in the attained mechanical behavior of treated PAN nanofibers.…”

Section: Resultsmentioning

confidence: 93%

“…The concentration of applied solution was 14% (wt %). These are optimized conditions based on high productivity and molecular orientation that were obtained at previous work 12…”

Section: Methodsmentioning

confidence: 99%

Mechanical and structural characterizations of simultaneously aligned and heat treated PAN nanofibers

Ravandi

Sadrjahani

2011

J of Applied Polymer Sci

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A simple and nonconventional electrospinning technique was employed for producing aligned polyacrylonitrile (PAN) nanofibers. A thermal zone was placed between syringe needles and collector in the electrospinning set up to obtain aligned and heat treated nanofibers. Suitable temperatures for heat treat process of PAN nanofibers was determined using differential scanning spectroscopy (DSC) technique. The influence of treatment temperature was investigated on morphology, internal structure and mechanical properties of collected PAN nanofibers. The average fiber diameter measured from SEM images exhibited decreasing trend at higher temperatures. FTIR spectra indicated no considerable difference between chemical structure of untreated and treated PAN nanofibers. Crystallization degree of PAN nanofibers cal-culated from WAXD patterns showed relatively low change with treatment temperature. Tenacity values of nanofiber bundles increased with increasing temperature while the extension values had an inverse trend. However, the modulus did not show a regular manner, but treated nanofibers had more modulus than untreated ones. The stress and modulus of PAN nanofibers increased to 112.9 MPa and 7.25 GPa at 270 C, respectively. Nanofibers treated at the highest temperature had the largest amount of crystallinity and strength.

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“…Production of aligned and molecularly oriented polyacrylonitrile (PAN) nanofibers using a nonconventional approach—that is, using two needles in opposite positions and a rotating collector perpendicular to the needle axis—has been reported by other researchers . Recent studies have shown that alignment of nanofibers improved molecular orientation and, consequently, improved mechanical properties in comparison with randomly oriented nanofibers . Production of PAN‐based nanofibrous tubular structures using the opposite‐charge electrospinning method has not been reported so far in the literature.…”

Section: Introductionmentioning

confidence: 99%

“…[29] Recent studies have shown that alignment of nanofibers improved molecular orientation and, consequently, improved mechanical properties in comparison with randomly oriented nanofibers. [30,31] Production of PAN-based nanofibrous tubular structures using the opposite-charge electrospinning method has not been reported so far in the literature. Polymer nanofibers can be continuous and have high mechanical properties, especially in the production of nanofibrous tubular scaffolds with oriented nanofibers.…”

Section: Introductionmentioning

confidence: 99%

Production of polyacrylonitrile/boehmite nanofibrous composite tubular structures by opposite‐charge electrospinning with enhanced properties from a low‐concentration polymer solution

2019

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Polyacrylonitrile (PAN)/boehmite nanofibrous composite tubular structures were fabricated from dilute polymer solutions using an opposite‐charge electrospinning method. The samples were characterized by X‐ray diffraction, Differential scanning calorimetry, scanning electron microscopy, Fourier‐transform infrared spectroscopy, fast Fourier transform, and tensile tests. The presence of boehmite nanoparticles in the electrospun PAN nanofibers prevented bead formation, resulting in uniform fibers with smaller diameters, and improved alignment from low‐concentration PAN polymer solutions. 1 wt% boehmite‐loaded nanofibrous composite tubular structure was selected as the optimal formulation to proceed with the crystallinity and tensile tests, which showed enhanced crystalline properties as well as an abrupt shift in tensile performance. The tensile properties of the nanofiber strongly depended on their crystalline properties. The strong intermolecular forces (hydrogen bonds) between the AlOH groups formed at the surface of boehmite nanoparticles and the polar CN groups along the polymer chains. In addition, the high electrical force between the two tips of the needles in the opposite charge set‐up can contribute to the control of electrical jet deposition instability when using a low‐concentration electrospinning solution, leading to enhanced properties.

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Development and characterization of highly oriented PAN nanofiber

Cited by 24 publications

References 10 publications

Three‐dimensional pore structure analysis of Nano/Microfibrous scaffolds using confocal laser scanning microscopy

Three‐dimensional pore structure analysis of Nano/Microfibrous scaffolds using confocal laser scanning microscopy

Mechanical and structural characterizations of simultaneously aligned and heat treated PAN nanofibers

Production of polyacrylonitrile/boehmite nanofibrous composite tubular structures by opposite‐charge electrospinning with enhanced properties from a low‐concentration polymer solution

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