Готові списки джерел за темами / Blend electrospinning

Добірка наукової літератури з теми "Blend electrospinning"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Blend electrospinning"

Zhang, Lu, Lin Gang Wang, and Ping Hu. "Fabrication of Tissue Engineering Scaffolds via Multi-Jet and Component Alternate Electrospinning." Key Engineering Materials 288-289 (June 2005): 67–70. http://dx.doi.org/10.4028/www.scientific.net/kem.288-289.67.

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In this article, electrospinning of poly (ethylene oxide) (PEO) /egg white blend and that of poly (carbon dioxide-co-propylene oxide) were studied. Blend fibrous mats containing poly (carbon dioxide-co-propylene oxide) and PEO/egg white blend were obtained through multi-jet and component alternate eletrospinning, respectively. Component alternate electrospinning exhibits higher efficiency and produces better blended products than multi-jet electrospinning does because the inter-influence between different jets during multi-jet electrospinning greatly affects electrospinning process while component alternate electrospinning avoids such kind of influence.

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Nguyen, Jimmy, Ratib M. Stwodah, Christopher L. Vasey, Briget E. Rabatin, Benjamin Atherton, Paola A. D’Angelo, Kathleen W. Swana, and Christina Tang. "Thermochromic Fibers via Electrospinning." Polymers 12, no. 4 (April 6, 2020): 842. http://dx.doi.org/10.3390/polym12040842.

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Cholesteryl ester liquid crystals exhibit thermochromic properties related to the existence of a twisted nematic phase. We formulate ternary mixtures of cholesteryl benzoate (CB), cholesteryl pelargonate (CP), and cholesteryl oleyl carbonate (COC) to achieve thermochromic behavior. We aim to achieve thermochromic fibers by incorporating the liquid crystal formulations into electrospun fibers. Two methods of incorporating the liquid crystal (LC) are compared: (1) blend electrospinning and (2) coaxial electrospinning using the same solvent system for the liquid crystal. For blend electrospinning, intermolecular interactions seem to be important in facilitating fiber formation since addition of LC can suppress bead formation. Coaxial electrospinning produces fibers with higher nominal fiber production rates (g/hr) and with higher nominal LC content in the fiber (wt. LC/wt. polymer assuming all of the solvent evaporates) but larger fiber size distributions as quantified by the coefficient of variation in fiber diameter than blend electrospinning with a single nozzle. Importantly, our proof-of-concept experiments demonstrate that coaxially electrospinning with LC and solvent in the core preserves the thermochromic properties of the LC so that thermochromic fibers are achieved.

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Suresh, Sinduja, Oleksandr Gryshkov та Birgit Glasmacher. "Impact of setup orientation on blend electrospinning of poly-ε-caprolactone-gelatin scaffolds for vascular tissue engineering". International Journal of Artificial Organs 41, № 11 (31 жовтня 2018): 801–10. http://dx.doi.org/10.1177/0391398818803478.

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Introduction: This article explores the effect of horizontal and vertical setups on blend electrospinning with two polymers having vastly different properties – poly-ε-caprolactone and gelatin, and subsequent effect of the resulting microstructure on viability of seeded cells. Methods: Poly-ε-caprolactone and gelatin of varying blend concentrations were electrospun in horizontal and vertical setup orientations. NIH 3T3 fibroblasts were seeded on these scaffolds to assess cell viability changes in accordance with change in microstructure. Results: Blend electrospinning yielded a heterogeneous microstructure in the vertical orientation beyond a critical concentration of gelatin, and a homogeneous microstructure in the horizontal orientation. Unblended poly-ε-caprolactone electrospinning showed no significant difference in fibre diameter or pore size in either orientation. Mechanical testing showed reduced elasticity when poly-ε-caprolactone is blended with gelatin but an overall increase in tensile strength in the vertically spun samples. Cells on vertically spun samples showed significantly higher viabilities by day 7. Discussion: The composite microstructure obtained in vertically spun poly-ε-caprolactone -gelatin blends has a positive effect on viability of seeded cells. Such scaffolds can be considered suitable candidates for cardiovascular tissue engineering where cell infiltration is crucial.

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Zhu, Rui Tian, Ming Hao Tan, Peng Zhang, Liang Zhang, Xiao Ming Chen, and Fan Wen Yang. "Morphological Structure and Thermal Property of PLA/PCL Nanofiber by Electrospinning." Advanced Materials Research 1048 (October 2014): 418–22. http://dx.doi.org/10.4028/www.scientific.net/amr.1048.418.

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Poly (lactic) acid (PLA)/poly (caprolactone) (PCL) blends nanofibers, with mean diameter about 600nm, were prepared by electrospinning. This research focused on the morphological and thermal properties of nanofibers made from PLA/PCL bends with different PCL content. The results showed that the addition of PCL could improve the morphology of the nanofibers. The film with blend fiber at PLA/PCL ratio of 80:20 is characterized with the smoothest surface and the highest orientation. The diameter distribution of blend fibers is wider than that of pure PLA. The glass-transition temperature of PLA for blend fiber is higher than that of pure PLA, and their melting temperature is lower than that of pure PLA. It can be used in biomedical field for degradable membrane, anti-adhesive film and medical equipment.

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Kang, Wei Min, Bo Wen Cheng, Quan Xiang Li, and Fang Fang Zuo. "Novel Antibacterial Nanofibers of Chitosan and Polyurethane Prepared by Electrospinning." Advanced Materials Research 150-151 (October 2010): 1452–56. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.1452.

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The chitosan(CS)/polyurethane(PU) blend nanofibers have been prepared for the first time by electrospinning. Formic acid (FA) and Hexafluoroisopropanol (HFIP) were found to be the co-solvent for electrospinning. The CS/PU blend solutions in various ratios were studied for electrospinning into nanofibers. The diameter and morphology of the fibers were shown by scanning electron microscope (SEM). It was found that the average diameter of the chitosan/PU blend fibers became larger, and the morphology of the fibers became finer with the content of PU increasing. To show the molecular interactions, CS/PU fibers were characterized by Fourier transform infrared spectroscopy (FT-IR). Moreover, the antibaterial activity of blend nanofibers against Escherichia coil (E.coil) was measured via optical density method. The blend nanofibers exhibited satisfying antibacterial activity against E.coil, even the chitosan concentration was only 5wt%. Therefore, the spun nanofibers are expected to be used in the native extracellular matrix for tissue engineering.

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Xu, Jia, Jin Xian Wang, Xiang Ting Dong, Gui Xia Liu, and Wen Sheng Yu. "Effect of PEO on the Hydrophilicity of PLLA Ultrafine Fibers." Advanced Materials Research 535-537 (June 2012): 2390–93. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.2390.

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The Polyethylene oxide (PEO) / Poly (L-lactic acid) (PLLA) ultrafine blend fibers have been prepared by electrospinning. The hybrid solvent of trichloromethane and ethanol was found to be the co-solvent for electrospinning. The PEO/PLLA blend solutions in various ratios were studied for electrospinning into ultrafine fibers. The morphology of the fibers was shown by scanning electron microscope (SEM). The hydrophilicity of fiber samples was characterized by determining their water contact angle. The spun ultrafine fibers are expected to be used in the native extracellular matrix for tissue engineering.

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Sasithorn, Nongnut, and Lenka Martinová. "Preparation of Silk Fibroin/Gelatine Blend Nanofibresby Roller Electrospinning Method." Advanced Materials Research 849 (November 2013): 45–49. http://dx.doi.org/10.4028/www.scientific.net/amr.849.45.

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This study was focused on the preparation of electrospunnanofibres from silk fibroin (SF)/gelatin (GP) blends solution using a roller electro spinning method. The effects of mixing ratio in SF/GP blend solution on properties of spinning solution (e.g., viscosity, conductivity and surface tension) and morphology of electrospunfibres were studied. The SF/GP blends solution containing up to the gelatin content of 30% could be electro spun into the continuous fibrous structure. Average diameter of SF/GP electrospunfibres were increased by increasing the amount of gelatin in spinning solution. The SF/GP electrospunfibres showed bigger diameter and broader diameter distribution than pure silk fibroin electrospunfibres. The SF/GP nanofibres had diameters ranging from 400 to 1300 nm.

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Daelemans, Lode, Iline Steyaert, Ella Schoolaert, Camille Goudenhooft, Hubert Rahier, and Karen De Clerck. "Nanostructured Hydrogels by Blend Electrospinning of Polycaprolactone/Gelatin Nanofibers." Nanomaterials 8, no. 7 (July 20, 2018): 551. http://dx.doi.org/10.3390/nano8070551.

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Nanofibrous membranes based on polycaprolactone (PCL) have a large potential for use in biomedical applications but are limited by the hydrophobicity of PCL. Blend electrospinning of PCL with other biomedical suited materials, such as gelatin (Gt) allows for the design of better and new materials. This study investigates the possibility of blend electrospinning PCL/Gt nanofibrous membranes which can be used to design a range of novel materials better suited for biomedical applications. The electrospinnability and stability of PCL/Gt blend nanofibers from a non-toxic acid solvent system are investigated. The solvent system developed in this work allows good electrospinnable emulsions for the whole PCL/Gt composition range. Uniform bead-free nanofibers can easily be produced, and the resulting fiber diameter can be tuned by altering the total polymer concentration. Addition of small amounts of water stabilizes the electrospinning emulsions, allowing the electrospinning of large and homogeneous nanofibrous structures over a prolonged period. The resulting blend nanofibrous membranes are analyzed for their composition, morphology, and homogeneity. Cold-gelling experiments on these novel membranes show the possibility of obtaining water-stable PCL/Gt nanofibrous membranes, as well as nanostructured hydrogels reinforced with nanofibers. Both material classes provide a high potential for designing new material applications.

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Teng, Shu-Hua, Peng Wang, and Hyoun-Ee Kim. "Blend fibers of chitosan–agarose by electrospinning." Materials Letters 63, no. 28 (November 2009): 2510–12. http://dx.doi.org/10.1016/j.matlet.2009.08.051.

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Bajaj, Bharat, Sang Joon Yoon, Byeong Hee Park, and Jae Rock Lee. "Coiled Fibers of Poly (Amide-Co-Imide) PAI and Poly (Trimellitic Anhydride Chloride-Co-4, 4'-Methylene Dianiline) (PTACM) by using Mechano-Electrospinning." Journal of Engineered Fibers and Fabrics 7, no. 2_suppl (June 2012): 155892501200702. http://dx.doi.org/10.1177/155892501200702s06.

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Non-linear coil shaped uniform fibers were synthesized with the blend solution of Poly (amide-co-imide) PAI (torlon)/Poly (trimellitic anhydride chloride-co-4, 4'-methylene dianiline) (PTACM) in solvent mixing ratio of DMSO and THF (6:4) by using mechano-electrospinning. The linear shape and decrease in size of fiber was observed as the concentration of blend solution decreases from 30–27 %. However if concentration was reduced to 26 %, regular coil shaped uniform fibers were produced. We also found that solution prepared in 6:4 (DMSO/THF) and concentration less than 26 % did not facilitate continuous electrospinning. The properties of these blends were investigated using a rotational rheometer and SEM, in an attempt to understand the relationships between their rheological and morphological properties. It was concluded that concentration of solution played an important role to the diameter of fiber and significant impact on the shape of fiber.

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Дисертації з теми "Blend electrospinning"

Goktas, Ahmet. "Electrospinning Of Polystyrene/butly Rubber Blends: A Parametric Study." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609361/index.pdf.

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Nanofibers, which have high surface area to volume ratio and better mechanical properties, are nanomaterials that both industry and scientists have started to show great attention in the last two decades. They are used in many areas such as life and filtration sciences, sensors, and composite reinforcement etc. Among five main production types, electrospinning is the best candidate for further development with a wide range of opportunities to be applied to all types of polymers and ceramics. This method uses electrically charged jet of polymers or liquid states of polymers to produce fibers from micro dimensions down to nano dimensions. Electrospinning setup has mainly three parts
(i) an AC/DC high voltage equipment which creates high electrical potential, (ii) a syringe, and (iii) a collecting screen. The purpose of this study is to electrospin polystyrene/butyl rubber blends and to investigate the effects of electrospinning parameters on the fibers produced. In this study, polystyrene/butyl rubber blends were electrospun by changing the applied voltage, the tip-to-collector distance, the flowrate, and the butyl rubber content in the fiber. Finally, morphology of electrospun fibers was characterized by SEM. The average fiber diameters varied from 760 nm to nearly 10 µ
m. Increasing butyl rubber content in the fiber resulted in a decrease in the final fiber diameter. Increasing applied voltage also caused a decrease in the final fiber diameter. The tip-to-collector distance did not affect the average fiber diameter. Increasing flowrate yielded fibers with larger diameters. Finally, the addition of non-ionic surfactant decreased the average fiber diameter.

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Аврунін, О. Г., O. G. Avrunin, М. Ю. Тимкович, M. Tymkovych, B. Glasmacher, and O. Gryshkov. "Ethylene glycol improves cryopreservation of cell-seeded electrospun scaffolds in cryobags." Thesis, Zalozba FE, 2020. http://openarchive.nure.ua/handle/document/13884.

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Cryopreservation of functional three-dimensional tissue-engineered constructs described. This work suggests that using controlled cryopreservation steps and EG as a non-toxic CPA, efficient cryopreservation of TECs in cryobags becomes feasible.

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Yan, Han. "Electrospinning-Derived Carbon/Graphite Nanofiber Mats from a Polyimide-Mesophase Pitch Blend Precursor for Flexible Thermal Management Thin Films." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1309678439.

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Giani, Niccolò. "Membrane elettrofilate a base di miscele polimeriche per la modifica strutturale di compositi laminati." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16214/.

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I compositi laminati presentano problematiche legate alla delaminazione, ovvero al distaccamento delle lamine costituenti, ed allo scarso smorzamento delle vibrazioni (damping). L’obiettivo del presente elaborato di tesi è lo sviluppo e la produzione di membrane nanofibrose prodotte mediante elettrofilatura di blend polimeriche per la modifica strutturale di compositi laminati al fine di migliorarne la proprietà di damping e la resistenza alla delaminazione. Particolare attenzione è stata posta all’ottimizzazione sia dei parametri della soluzione (principalmente concentrazione e sistema solvente) che dei parametri di processo (portata, voltaggio applicato e distanza ago-collettore). La morfologia delle nanofibre è stata osservata mediante microscopia a scansione elettronica (SEM), la quale ha confermato la presenza di nanofibre con diametro nanometrico (200-800 nm), e prive di difetti (beads). Inoltre, le membrane sono state caratterizzate termicamente (TGA e DSC) e meccanicamente (prove di trazione).

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Mafuma, Tendai Simbarashe. "Immobilisation of electric eel acetylcholinesterase on nanofibres electrospun from a nylon and chitosan blend." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1001620.

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Organophosphates and carbamates are potent inhibitors of the neurotransmitter acetylcholinesterase. This inhibition results in the blocking of nerve signal transference into the post synaptic neuron leading to loss of muscle action and death. Because of the universal mechanisms of signal transduction in animals, these inhibitors have been widely used as agricultural pesticides as well as chemical warfare agents (nerve agents). Health issues associated with pesticide usage result from the fact that both the pesticides and their breakdown products often end up in water and food sources as well as in the soil. As a result, there has been an increase in the number of studies aimed at the detection of these pesticides in the environment. One popular research area is enzyme based biosensor construction. Some important criteria for consideration during the construction of biosensors are the importance of a suitable solid support as well as the enzyme immobilisation method. Recently, there has been increased interest in using nano-scale material e.g. using nanoparticles as enzyme support material. This is largely due to their advantages such as large surface area to volume ratio as well as reduced mass transfer resistance. Electrospinning is a straight forward and cost effective method for producing nanofibres from any soluble polymer(s). The applications of electrospun nanofibres have been reported in clinical studies, biofuel production as well as bioremediation. In this study two polymers were selected: nylon for its mechanical stability and chitosan for its biocompatibility and hydrophilicity, for the fabrication of electrospun nanofibres which would function as immobilisation support material for acetylcholinesterase. The first objective of this study was to electrospin nanofibres from a nylon-6 and chitosan blend solution. A binary solvent system consisting of formic acid and acetic acid (50:50) successfully dissolved and blended the polymers which were subsequently electrospun. Scanning electron microscopy characterisation of the nanofibres showed that (i) a nylon-6: chitosan ratio of 16%: 3% resulted in the formation of bead free nanofibres and (ii) the fibres were collected in non-woven mats characterised by different size nanofibres with average diameters of 250 nm for the main fibres and 40 nm for the smaller nanofibres. Fourier transform infra-red (FT-IR) analysis of the nanofibres indicated that a new product had been formed during the blending of the two polymers. The second aim of the study was to carry out a facile immobilisation of electric eel acetylcholinesterase via glutaraldehyde (GA) cross-linking. Glutaraldehyde solution 5% (v/v) resulted in the immobilisation of 0.334 mg/cm² of acetylcholinesterase onto the nanofibres. The immobilisation procedure was optimised with reference to acetylcholinestease and crosslinker concentrations, incubation time and the cross-linking method. A comparative investigation into the optimum pH and temperature conditions, pH and thermal stabilities, substrate and inhibition kinetics was then carried out on free and immobilised acetylcholinesterase. The final objective of this study was to determine the storage stabilities of the immobilised and free enzymes as well as the reusability characteristics of the immobilised acetylcholinesterase. Several conclusions were drawn from this study. Acetylcholinesterase was successfully immobilised onto the surface of nylon-6:chitosan nanofibres with retention of its activity. There was a shift in the pH optimum of the immobilised acetylcholineseterase by 0.5 units towards a neutral pH. Although both free and immobilised acetylcholinesterase exhibited the same optimum temperature, immobilised acetylcholinesterase showed enhanced thermal stability. In terms of pH stability, immobilised acetylcholinesterase showed greater stability at acidic pH whilst free acetylcholinesterase was more stable under alkaline pH conditions. Relative to free acetylcholinesterase, the immobilised enzyme showed considerable storage stability retaining ~50% of its activity when stored for 49 days at 4°C. Immobilised acetylcholinesterase also retained > 20% of its initial activity after 9 consecutive reuse cycles. When exposed to fixed concentrations of carbofuran or demeton-S-methyl sulfone, immobilised acetylcholinesterase showed similar inhibition characteristics to that of the free enzyme. The decrease in enzyme activity observed after immobilisation to the nanofibres may have been due to several reasons which include some enzyme molecules being immobilised in structural conformations which reduced substrate access to the catalytic site, participation of the catalytic residues in immobilisation and enzyme denaturation due to the reaction conditions used for acetylcholinesterase immobilisation. Similar observations have been widely reported in literature and this is one of the major drawbacks of enzyme immobilisation. In conclusion, nylon-6:chitosan electrospun nanofibres were shown to be suitable supports for facile acetylcholinesterase immobilisation and the immobilised enzyme has potential for use in pesticide detection. Future recommendations for this study include a comparative study of the GA cross-linking method for AChE immobilisation which will lead to more intensely bound enzyme molecules to prevent non-specific binding. An investigation into the effect of inhibitors on stored immobilised AChE, as well as reactivation and reuse studies, may also be useful for determining the cost-effectiveness of reusing immobilised AChE for pesticide detection in environmental water samples. Several models have been designed for the determination of the kinetic parameters for immobilised enzymes. These take into account the mass transfer resistance as well as the overall charge of the immobilisation matrix. The use of these models to analyse experimental data will give a clear understanding of the effects of immobilisation on enzyme activity

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Devadas, Suchitha. "Fabrication of Lignin-Based Nanofibers: Influence of Lignin Type, Blend Ratios, and Total Polymer Concentration." University of Dayton / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=dayton160831003121355.

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Biber, Erkan. "Production And Characterization Of Nanofibers From Polycaprolactam And Ethylene-butyl Acrylate-maleic Anhydride Terpolymer Mixture." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/2/12611870/index.pdf.

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The impact strength of Nylon 6 was improved by adding Ethylene- n-Butyl acrylate- maleic anhydride (E-nBA-MAH) terpolymer with various concentrations from 0% (w/w) to 15% (w/w). The bare interaction energy between two polymers was investigated by using melting point depression approach utilizing both the Flory-Huggins (FH) theory and the Sanchez-Lacombe Equation of State (SL EOS). The solution of the mixture was electrospun, and the effects of process parameters on the expected radii of nanofibers were investigated. The effects of process parameters such as polymer concentration in solution, electrical field, diameter of syringe needle, feed rate, and collector geometry on nanofibers were studied. The statistical analysis to relate these parameters on the diameter of nanofibers was carried out by using Johnson SB distribution. The ratio of elastic modulus to viscosity coefficient of nanofibers was worked out by using AFM and combined viscoelastic models. The experiments were carried out on single fiber. The ratio came out to be a function of nanofiber diameter and terpolymer concentration. Isothermal crystallization kinetics and WAXS diffraction patterns of blends revealed and also SEM images supported that after 5% addition of elastomeric terpolymer, the interaction between the components of the blend gets weaker. The elastic modulus of the blend with 5% of terpoymer was greater than that of the neat Nylon 6, but the elastic modulus decreased for the blends containing more than 5% terpolymer.

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Munj, Hrishikesh. "CO2 ASSISTED PROCESSING OF BIOCOMPATIBLE ELECTROSPUN POLYMER BLENDS." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1400693315.

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Chaparro, Francisco Javier. "Biocompatible Electrospun Vehicles To Enhance the Effectiveness Of Anti-Fertility Strategies And Their Biomimetic Properties As Blood Vessel Scaffolds." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1514986344784852.

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Favi, Pelagie Marlene. "Electrospun Blends of Polydioxanone and Poly(lactic Acid): Mechanical, Morphological, and Permeability Studies." VCU Scholars Compass, 2007. http://hdl.handle.net/10156/1271.

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Частини книг з теми "Blend electrospinning"

Jishnu, N. S., S. K. Vineeth, Akhila Das, Neethu T. M. Balakrishnan, Anjumole P. Thomas, M. J. Jabeen Fatima, Jou-Hyeon Ahn, and Raghavan Prasanth. "Electrospun PVdF and PVdF-co-HFP-Based Blend Polymer Electrolytes for Lithium Ion Batteries." In Electrospinning for Advanced Energy Storage Applications, 201–34. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8844-0_8.

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Salas, Carlos L., and Carlos L. Salas. "Electrospinning of Soy Protein Nanofibers: Synthesis and Applications." In Soy Protein-Based Blends, Composites and Nanocomposites, 135–54. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781119419075.ch6.

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Wei, M., B. Kang, C. Sung, and J. Mead. "Preparation of Nanofibers with Controlled Phase Morphology from Electrospinning of Polybutadiene—Polycarbonate Blends." In ACS Symposium Series, 149–62. Washington, DC: American Chemical Society, 2006. http://dx.doi.org/10.1021/bk-2006-0918.ch011.

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Buzgo, Matej, Andrea Mickova, Michala Rampichova, and Miroslav Doupnik. "Blend electrospinning, coaxial electrospinning, and emulsion electrospinning techniques." In Core-Shell Nanostructures for Drug Delivery and Theranostics, 325–47. Elsevier, 2018. http://dx.doi.org/10.1016/b978-0-08-102198-9.00011-9.

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"Effects of Electric Field and Sericin Content in the Blend on the Nanofi bers Uniformity." In Electrospinning of Nanofibers in Textiles, 81–85. Apple Academic Press, 2011. http://dx.doi.org/10.1201/b12229-13.

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"Electrospinning Of Nanofibers And Porosity." In Nanostructured Polymer Blends and Composites in Textiles, 235–52. Apple Academic Press, 2016. http://dx.doi.org/10.1201/b19370-12.

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Pant, Bishweshwar, and Mira Park. "Electrospun Nanofibers for Drug Delivery Applications." In Innovative Approaches for Nanobiotechnology in Healthcare Systems, 33–51. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-7998-8251-0.ch002.

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Анотація:

Nanofiber systems with various composition and biological properties have been extensively studied for various biomedical applications. The electrospinning process has been regarded as one of the versatile techniques to prepare nano to microfibers. The electrospun nanofibers are being used especially in textile industries, sensors, filters, protective clothing, energy storage materials, and biomedical applications. In the last decade, electrospun nanofibers have been highly investigated for drug delivery systems to achieve a therapeutic effect in specifically targeted sites. Various drugs or biomolecules can be easily loaded into the electrospun nanofibers by direct or indirect methods. The proper selection of polymers (or blends of various polymers), drugs, solvents to prepare the composite nanofibers with desired morphology are the tools in enhancing the bioavailability, stability, and bioactivity of drugs.

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Тези доповідей конференцій з теми "Blend electrospinning"

Jaehyun Hur, Seung-Nam Cha, Kyuhyun Im, Sung Won Lee, Unyong Jeong, Jongmin Kim, and Jong-Jin Park. "P3HT-PS blend nanofiber FET based on electrospinning." In 2010 IEEE 10th Conference on Nanotechnology (IEEE-NANO). IEEE, 2010. http://dx.doi.org/10.1109/nano.2010.5697915.

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Kang, Yong-qiang, Lu-lu Li, Yan-gong Yang, and Le-jing Li. "Electrospinning of MF-PAN Blend Fibers: The Effect of MF-PAN-DM Blend Solution Composition." In The 3rd International Conference on Machinery, Materials Science and Energy Engineering (ICMMSEE 2015). WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814719391_0048.

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Choi, Eun Sik, Sunanda Roy, Hyun Chan Kim, K. C. Park, and Jaehwan Kim. "Electrospinning of cellulose nanofiber and poly(vinyl alcohol) blend: experiment and simulation." In Nano-, Bio-, Info-Tech Sensors and 3D Systems, edited by Jaehwan Kim. SPIE, 2019. http://dx.doi.org/10.1117/12.2513855.

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Ji, Yali, Isaac Rodriguez, and Gary L. Bowlin. "Electrospinning of Chitin Whisker-Reinforced Nanocomposite Fibrous Scaffolds." In ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80104.

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Chitin is the second most abundant biopolymer next to cellulose and possesses many favorable properties such as non-toxicity, high crystallinity, biocompatibility and biodegradability. Acid-treatment of chitin can dissolve regions of low lateral order, resulting in elongated rod-like nanocrystals, termed “whiskers”. Chitin whiskers (CWs) are an emerging and novel nanofiller that have been shown to bring about reinforcing effects on both synthetic and natural polymeric structures. The biocompatibility and biodegradability also make it one of the most promising fillers.1 However; it was thought that CWs can only well disperse in aqueous solution, and poorly disperse in organic solvents, which to some extent restricts the development of CW-based nanocomposites. In a previous study, we found that the CW can be well dispersed in 1,1,1-trifluoroethanol (TFE) solvent which is a good solvent for commonly used biodegradable polymers such as polycaprolactone (PCL), polylactide (PLA) and polydioxanone (PDO). Thus, it is possible to blend CWs with these biopolymers to prepare nanocomposite scaffolds. Electrospinning is a rather simple and promising technique to fabricate scaffolds, since the resulting microstructures are similar to the extracellular matrix (ECM) with potential facilitate the design of surgical implants and promote tissue regeneration. Thus, the focus of this work was to develop CW-reinforced nanocomposite fiber scaffolds via electrospinning and investigate their mechanical and biological properties, expecting them to be potential candidates for bone tissue engineering applications.

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Flueckiger, Jonas, Frank K. Ko, and Karen C. Cheung. "Electrospun Electroactive Polymer and Metal Oxide Nanofibers for Chemical Sensor Applications." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-39220.

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We present the fabrication of a polymer blend PANi/PEO nanofiber based sensor as well as a metal oxide TiO2 nanofiber based sensor. Electrospinning was used for the fabrication of the electroactive nanofibers. The conductivity of those fibers is highly sensitive to the chemical environment and is modified through the adsorption of different species. Used as a chemiresistor the nanofibers offer a higher sensitivity than thin films due to the increased surface to volume ratio. Impedance spectroscopy was used for electrical characterization of the fibers showing high sensitivity. Preliminary measurements of the sensors dynamic response when exposed to alternating chemical environments showed fast response times and good signal stability.

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Yan, Karen Chang, Michael Rossini, Michael Sebok, and John Sperduto. "Concentration Characterization of Encapsulated Macromolecules in Electrospun Alginate Fibers Using Image Analysis." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-52585.

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Electrospun fibers made of biocompatible polymers have been used as scaffolds in tissue engineering to mimic the fibrous environment found in the extracellular matrix (ECM) of biological tissue; and bioactive macromolecules can also be encapsulated in the electrospun fibers. In order to control the release of these encapsulated macromolecules, it is of great interest to understand how the release rate is affected by the sizes of molecules, cross-linking as well as electrospinning configuration (single axial versus co-axial). Fluorescein imaging technique has been applied in quantifying molecular transport phenomena. This paper presents an image analysis method to establish a baseline correlation between the fluorescent intensity and the macromolecule concentration in the electrospun fibers. In this study, alginate and Poly(ethylene oxide) (PEO) blend polymer aqueous solution (1:1 ratio, 3% w/v) was used to electrospin fibers and fluorescein-isothiocyanate dextran (FITC-dextran) with different molecular weights was chosen as the encapsulated macromolecule. Linear correlation was established based on the statistical analysis of electrospun fiber images, and imaging parameters effects were also identified.

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Yan, Karen Chang, Aren Moy, and Michael Sebok. "Modeling of Diffusive Behavior of Macromolecules Encapsulated in Electrospun Fibers." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-67770.

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Electrospun (ES) fibers made of biocompatible polymers have been used as scaffolds in tissue engineering due to the potential to mimic the fibrous environment found in the extracellular matrix of biological tissue. Bioactive macromolecules such as growth factors have also been incorporated in the electrospun fibers to promote cell growth and differentiation. Therefore, it is critical to understand and control the release rate of the bioactive molecules. This paper presents the development of a stochastic simulation method to model the diffusive behaviors of macromolecules encapsulated in electrospun fibers. Specifically, a given ES fiber sample is represented by a set of random fibers with total fiber number denoted as N. Each fiber in the set is assumed as a cylinder and has a randomly assigned diameter and length, these parameters are based on statistical distributions determined from physical fiber samples. The Fick’s diffusion equation is used to solve the concentration of encapsulated macromolecules in the fiber due to diffusion. Upon obtaining the solution of the concentration of molecules in individual fibers, one can determine the overall diffusion behavior for a given sample with random fibers distributed. A subsequent statistical characterization can be performed based on the results of a set of random generated samples. Moreover, the developed method can be applied to the diffusion of macromolecules encapsulated in microspheres. The developed method was implemented in MATHEMATICA. As an example, the ES fiber samples were generated via electrospinning alginate and poly(ethylene oxide) (PEO) blend polymer aqueous solution (1:1 ratio, 3% w/v), and FITC–dextran was mixed in the polymer solution to enable fluorescent image analysis. The fiber diameter, length and number of fibers were determined based on the fluorescent images of fiber samples. Parametric study was conducted to examine how the diffusive behavior of encapsulated macromolecules is affected by the fiber diameters, total number of fibers, diffusion constants, and boundary conditions. Furthermore, the stochastic analyses were conducted for cases of the diffusion of macromolecules encapsulated in microspheres. The model predictions agree well with the experimental data obtained from the literature.

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Martinova, Lenka, and Daniela Lubasova. "Reasons for using polymer blends in the electrospinning process." In INTERNATIONAL CONFERENCE ON NANOTECHNOLOGY - RESEARCH AND COMMERCIALIZATION 2011: (ICONT 2011). AIP, 2012. http://dx.doi.org/10.1063/1.4769138.

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Kang, Jia-Chen, Min Wang, and Xiao-Yan Yuan. "Bicomponent Fibrous Scaffolds of Controlled Composition for Tissue Engineering Applications." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-10989.

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Electrospinning has been widely studied for constructing tissue engineering scaffolds because of the morphological and size effects of electrospun fibers on cell behavior. Research on electrospun tissue engineering scaffolds has been based mainly on using solutions of single polymer or blends of polymers dissolved in common solvents, which has put limitations to scaffolds that can be built. There is an increasing need for using the multi-source and multi-power electrospinning approach to fabricate multicomponent fibrous scaffolds because these scaffolds have great potential for tissue engineering and controlled (drug) release applications. In the present study, bicomponent fibrous scaffolds were fabricated through dual-source and dual-power electrospinning using poly(L-lactic acid) (PLLA) and gelatin polymers. The experimental setup ensured that the solution and electrospinning parameters for each electrospun fibrous component were controlled separately and hence the morphology of electrospun fibers could be controlled and optimized. By adjusting the number of syringes that fed polymer solutions, the composition of bicomponent scaffolds (i.e. the weight percentage of gelatin varying from 0 to 100%) could also be controlled. Such controls would yield scaffolds of desired properties (hydrophilicity, degradation rate, strength, etc.) After electrospinning, pure gelatin scaffolds and bicomponent scaffolds were crosslinked by glutaraldehyde (GA) and genipin, respectively, using different crosslinking methods. Both crosslinked and non-crosslinked scaffolds were studied using various techniques (scanning electron microscopy (SEM) for scaffold morphology, differential scanning calorimetry (DSC) for polymer crystallinity, contact angle measurement for hydrophilicity, tensile testing for mechanical properties and crosslinking efficiency, etc.). It was found that the bicomponent scaffolds were more hydrophilic than pure PLLA scaffolds due to the presence of gelatin fibers. The tensile strength of bicomponent scaffolds was also increased after crosslinking. Using our experimental setup, bicomponent scaffolds could be constructed for tissue engineering with enhanced mechanical properties, biocompatibility and biodegradability. Furthermore, in the bicomponent scaffolds, while PLLA fibers could act as the structural component with a slower degradation rate, the gelatin fibers could be used as a carrier for therapeutic agents (drugs and therapeutic biomolecules). With controlled degrees of the crosslinking of gelatin, the release of therapeutic agents from gelatin fibers would be controlled.

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Chen, Shih-Hsien, Guo-Jyun Lai, and Jyh-Ping Chen. "Preparation of biomimetic nanofibers by electrospinning of blends of silk fibroin and chitosan for bone tissue engineering." In 2011 IEEE 4th International Nanoelectronics Conference (INEC). IEEE, 2011. http://dx.doi.org/10.1109/inec.2011.5991742.

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