Papers by Keyword: Electrospun

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Authors: Alvaro Antonio Alencar de Queiroz, José Carlos Bressiani, Ana Helena A. Bressiani, Olga Z. Higa, Gustavo Abel Abraham
Abstract: A novel bone scaffolding material was successfully fabricated by electrospinning from hyperbranched polyglycerol (HPGL) solutions containing nanoparticles of hydroxyapatite (HA). The potential use of the electrospun fibrous HPGL-HA scaffolds for bone regeneration was evaluated in vitro with human osteoblasts in terms of alkaline phosphatase (ALP) activity of the cells that were cultured directly on the scaffolds. The results were compared with those on corresponding HPLG-HA solution-cast film scaffolds. It was found that all of the fibrous scaffolds promoted much better adhesion and proliferation of cells than the corresponding film scaffolds.
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Authors: Jian Fei Xie
Abstract: Electrospun membrane filters used to remove particles from hot gases were highly desired to meet the requirement of application in high temperature. Polyimide is a kind of high performance polymer, especially for excellent thermal stability and chemical resistance. In this paper, the polyimide precursor poly (amic acid) (PAA) was synthesized from 3,3’,4,4’-oxydiphthalic anhydride (ODPA) and 4,4’-methylenedianiline (MDA), the polyimide (PI) ultrathin fiber membrane was fabricated by electrospinning and followed by thermal imidization. Scanning electron microscope (SEM), infrared spectrometry (IR), and thermogravimetric analysis (TGA) were used for the characterizations of the polyimide ultrathin fiber Membrane, the tests show that the diameter of ultrathin fiber is uniform with an average size of around 400nm and the membrane is thermally stable at a high temperature of 500°C.
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Authors: A. Mataram, Ahmad Fauzi Ismail, A.S. Mohruni, T. Matsura
Abstract: Effects of material and process parameters on the electrospun polyacrylonitrile fibers were experimentally investigated. Response surface methodology (RSM) was utilized to design the experiments at the setting of solution concentration, voltage and the collector distance. It also imparted the evaluation of the significance of each parameter on pore size, contact angle, modulus young and clean water permeability. Effect of applied voltage in micron-scale fiber diameter was observed to be almost negligible when solution concentration and collector distance were high. However, all three factors were found statistically significant in the production of nano-scale fibers. The response surface predictions revealed the parameter interactions for the resultant fiber diameter, and showed that there is negative correlation between the mean diameter and coefficient of variation for the fiber diameters were in agreement with the experimental results. Response surfaces were constructed to identify the processing window suitable for producing nanoscale fibers. A sub-domain of the parameter space consisting of the solution concentration, applied voltage and collector distance, was suggested for the potential nano scale fiber production.
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Authors: S. Phunturug, S. Rassameemasmaung, Winita Punyodom, Robert Molloy, A. Sirikulsathean, Krisda Suchiva, P. Piyakunakorn
Abstract: 75:25 poly (DL-lactide-co-ε-caprolactone) electrospun resorbable membranes were prepared by electrospinning and film casting techniques. Primary cultures of human periodontal ligament (HPDL) fibroblasts cells were seeded on the electrospun membranes, film-cast membranes, and control glass cover slips. The number of cell attached was determined at 1, 3, 24 and 72 h after cell seeding. Cell proliferation on the membranes was determined by MTT assay at 1.5 h and 1, 3, 5 and 7 days after cell seeding. The morphology of cells was also determined by SEM. The results indicated that the cell attached number and cell proliferation on the electrospun membranes were significantly higher than that of the film-cast membranes at every time point. From an SEM study, HPDL cells could healthy attach on both, the electrospun membranes and the film-cast membranes. HPDL cells were firmly attached to the membrane matrix in the electrospun membrane group. In the film-cast group, HPDL were loosely attached to the membrane surfaces. In conclusion, an electrospun membrane had better ability to promote HPDL cell attachment and proliferation than did film-cast membranes.
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Authors: Dong Hua Guan, Chun Peng Huang, Ji Liu, Kun Tian, Lin Niu, Ying He Lin, Yi Li Qu, Peng Wang, Yong Mei Ye, Zhi Qing Chen
Abstract: Poly 3-hydroxybutyrate (PHB) as a kind of polysaccharides has been proved promising for tissue engineering because of its biocompatibility and biodegradability. But its poor mechanical properties and hydrophilicity limit its application. In order to explore a new useful porch to improve the performance of PHB-based GTR membrane, membrane composed of nano-HA / PHB composite was manufactured through the air/jet electrospinning process which can potentially generate nanometer scale diameter fibers and enlarge surface area of materials while maintaining high porosity. Successively, the biomineralization behavior of the membrane in supersaturated calcification solution (SCS) was studied. The Results of this investigation show that the successfully manufactured porous nano-HA/PHB membrane has high activity in SCS and its ability of inducing the formation of mineral crystal in vitro than that of the unfilled PHB membrane. It can be concluded that the addition of nano-HA and the novel technology could improve the performance of the PHB-based GTR membrane.
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Authors: Wan Jin Cho, Jun Ho Kim, Se Heang Oh, Jin Ho Lee
Abstract: Electrospinning is a fabrication process that can produce highly porous nano-scale fiber-based matrices using an electrostatically driven jet of polymer solution. This method represents an attractive approach for polymeric biomaterial processing which provides the membrane structure that may retain mechanical strengths, flexibility, and high surface area. In this study, we prepared a guided bone regeneration (GBR) membrane with selective permeability, hydrophilicity, good mechanical strength and adhesiveness with bone using polycaprolactone (PCL) and Tween 80 by the electrospinning method. The prepared PCL and PCL/Tween 80 electrospun sheets were characterized via morphology observation, mechanical property, water absorbability, and model nutrient permeability. It was observed that the PCL/Tween 80 (3 wt%) electrospun sheet have an effective permeation of nutrients as well as the good mechanical strength to maintain a secluded space for the bone regeneration. From the results, the hydrophilized PCL/Tween 80 (3 wt%) electrospun sheet seem to be a good candidate as a GBR membrane.
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Authors: Antonella Macagnano, Emiliano Zampetti, Bianca Rita Pistillo, Andrea Bearzotti, Simone Pantalei, Riccardo d'Agostino
Abstract: In this work an attempt to obtain a more compact artificial system for gas sensing, properly designed on a transducer, is presented. This novel device can be applied for a wide application range such as environmental, bio-medical, agriculture etc. fields. In the Nature, a mucous layer covering olfactory receptor cells, selectively tunes chemical interactions among odorous molecules and sensing system. An odor, in fact, is perceived only if it is able to cross mucus of nasal cavity. A proper hydrophobic Teflon-like overcoating tunes chemical interactions, humidity free, between odorous molecules and sensing system, miming mucus covering olfactory receptor cells. Here the latters were represented by doped polyaniline added of polyethylenoxide. The interacting surface has been enormously enhanced creating nanofibrous coatings by electrospinning deposition technique. Such nanofibers can be compared with the olfactory cilia covered by mucus. Few modifications of both overlayers and nanofibrous polymers can encourage the developing of new chemical sensors for array sensor system generations. Surfaces analysis, electrical parameters and sensing properties of the double layers on interdigitated transducers have been investigated.
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Authors: Yan Ping Liu, Yi Bing Deng, Zheng Xiong Jiang
Abstract: Electrospinning and its application in filtration area have been caught much attention because of the large surface-to-volume ratio of nanoweb , which affects the filtration efficiency by possibly giving more particle-capture sites. In this study, PAN is electrospun to produce ultra-fine nonwovens, and its characteristics as filter media are investigated.
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Authors: Chun Mei Qiao, Ting Ting Jiang, Yin Ling Zhang, Wei Min Kang
Abstract: A kind of novel biodegradable Chlorinated Polyvinyl Chloride (CPVC) nanofibers using a mixture of Dimethyl Formamide (DMF) and Tetrahydrofuran (THF) as solvent were prepared by electrospinning process in this paper. The morphology of electrospun CPVC nanofiber nonwovens were investigated by scanning electron microscopy (SEM). Results indicated that the morphology and diameter of the electrospun fibers were influenced by CPVC solution concentration and the THF amount in the mixed solvents, and the finer and uniform nanofibers were electrospun from a mixed solvent of DMF and THF with ratio of 3/1(w/w).
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Authors: Prasit Pisesweerayos, Somsak Dangtip, Pitt Supaphol, Toemsak Srikhirin
Abstract: This research project produced two fabricated ultrafine conductive polymeric fibers. The first fiber was fabricated from a polymer and conductive polymer solution, and the second was fabricated from a polymer and metal nanoparticle/ nanocomposite. The resulting fibers were characterized and analyzed. For all fiber samples, the ultrafine polymeric fibers were fabricated using polyvinyl alcohol (PVA). The conductive polymer used in the first fiber sample was poly (3,4-ethylenedioxythiophene)/ polystyrene sulfonate (PEDOT/PSS). The conductive nanoparticles used in the second fiber sample were silver nanoparticles (AgNPs). The ultrafine conductive polymer fibers and the ultrafine conductive nanoparticle fibers were fabricated using an electrospining process. During the fabrication process of each fiber sample, different concentrations of either PEDOT/PSS, for fiber sample one, or AgNPs, for fiber sample two, were combined in PVA solution. Using optimal conditions, ultrafine fibers were fabricated at intervals of 5 min for the creation of random fibers, and intervals of 20 min for the creation of aligned fiber mats. The resulting fibers ranged from 0.1 μm to 0.2 μm in diameter. After characterization and analysis of the conductive ultrafine polymeric fibers, using either the PVA:PEDOT/PSS compound or the PVA:AgNPs compound, both samples produced greater conductive capacities with greater concentrations of solution. For the random fiber samples, the conductive capacity was sporadic. However, the ultrafine fiber mats (PVA:AgNPs) supported a capacity from 3.64 S/cm to 10.64 S/cm, and the PVA:PEDOT/PSS ultrafine fiber mats supported a capacity from 4.49 S/cm to 7.08 S/cm.
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