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      저자 : Fatemeh Haghighat (검색결과 2 건)
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        Enhancement of the Mechanical Properties of PAN Nanofiber/Carbon Nanotube Composite Mats Produced via Needleless Electrospinning System

        Zahra Ahmadi,Seyed Abdolkarim Hosseini Ravandi,Fatemeh Haghighat,Farzad Dabirian 한국섬유공학회 2020 Fibers and polymers Vol.21 No.6

        The current research presents the optimization of the parameters involved in the production of polyacrylonitrile(PAN) nanofibers via the needleless electrospinning system. The experiments were designed using the Taguchi method toinvestigate the morphological, physical, and mechanical properties of the nanofibers. The single-wall carbon nanotubes(CNT) were used in order to improve the mechanical properties of the electrospun nanofibers. The diameter of the PANnanofibers in the needleless system was less than 300 nm, which was smaller than that in the conventional system. The resultsshowed that the concentration had the greatest impact on the fiber diameter than other parameters in both PAN and PAN/CNTnanofibers. The specific stress of the nanofibers produced by the needleless electrospinning system was lower than thatcreated by the conventional electrospinning system. Addition of The CNT caused to improve the specific stress of the PAN/CNT nanofibers compared with the PAN nanofibers. However, excessive amounts of CNT had a negative effect on theelongation and modulus because of the aggregation of CNT inside the nanofibers. The X-ray diffraction analysis was used tostudy the crystalline behavior of the PAN nanofibers produced via the needleless electrospinning system. The results showedthat the PAN nanofibers had amorphous structure compared with the conventional PAN nanofibers.

      • KCI등재

        Investigation on the Biodegradability and Antibacterial Properties of Nanohybrid Suture Based on Silver Incorporated PGA-PLGA Nanofibers

        Farzaneh Rouhollahi,Seyed Abdolkarim Hosseini,Farzaneh Alihosseini,Alireza Allafchian,Fatemeh Haghighat 한국섬유공학회 2018 Fibers and polymers Vol.19 No.10

        Polyglycolic acid-poly lactic glycolic acid (PGA-PLGA) electrospun nanofibers containing silver nanoparticles have been produced and twisted into the nanofibrous yarn. The morphology of nanofibers and produced yarns, as well as the mechanical properties of the yarns, were investigated. Furthermore, in vitro antibacterial properties and in vitro degradation behavior of yarns containing various silver nanoparticles were studied. SEM images confirmed that the addition of the silver nanoparticles into the polymer solution increases the fiber diameters. The result of the mechanical test of the yarns alone and used in two different forms of the knots was measured and results showed that the strength of the yarns without the knot was significantly more than that of others. The biodegradability test showed that the mechanical properties and the weight of the yarns were quickly reduced after subjecting to in vitro condition. The result of the antibacterial test indicated that the nanofiber yarns containing %3 silver nanoparticles were the most appropriate sample with a considerably antibacterial activity against both gram-positive bacterium Staphylococcus aureus and gram-negative bacterium Escherichia Coli with inhibition zones of 8.1 and 9.5 mm, respectively; which demonstrated that silver nanoparticles retained their effectiveness after the electrospinning process. Therefore the nanofibrous yarns containing silver nanoparticles could be successfully produced by the electrospinning process with the proper antibacterial property as a candidate for the surgical sutures.

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