Thematische Bibliographien / Nanofibrous materials

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Auswahl der wissenschaftlichen Literatur zum Thema „Nanofibrous materials“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 1. Februar 2022

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Zeitschriftenartikel zum Thema "Nanofibrous materials"

Zhong, Wen, Malcolm M. Q. Xing und Howard I. Maibach. „Nanofibrous materials for wound care“. Cutaneous and Ocular Toxicology 29, Nr. 3 (02.06.2010): 143–52. http://dx.doi.org/10.3109/15569527.2010.489307.

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Burger, Christian, Benjamin S. Hsiao und Benjamin Chu. „NANOFIBROUS MATERIALS AND THEIR APPLICATIONS“. Annual Review of Materials Research 36, Nr. 1 (August 2006): 333–68. http://dx.doi.org/10.1146/annurev.matsci.36.011205.123537.

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GÜLER, BUKET, und FUNDA CENGİZ ÇALLIOĞLU. „Comparative analysis of superabsorbent properties of PVP and PAA nanofibres“. Industria Textila 72, Nr. 04 (01.09.2021): 460–66. http://dx.doi.org/10.35530/it.072.04.1806.

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This study presents the comparative analysis of production, characterization and absorption properties of Polyvinylpyrrolidone (PVP) and Polyacrylic acid (PAA) nanofibres. Firstly, optimization studies about polymer (PVP and PAA), superabsorbent additive (waterlock)(WL) and crosslinker agent (sodium persulfate and glutaraldehyde)concentrations were achieved. Then solution properties such as conductivity, surface tension and viscosity were determined. Electrospinning was carried out under the optimum process parameters (voltage, distance between the electrodes, solution feed rate etc.) to obtain superabsorbent nanofibrous surfaces. Surface and fibre morphologies were analysed with Scanning Electron Microscopy (SEM) and thickness of nanoweb and weight in grams of nanofibres were also measured. Lastly, optimized PVP and PAA nanofibres were compared in terms of absorption properties with water and synthetic urine with various times from 5 to 86400 seconds. According to the results, generally fine, smooth and uniform nanofibres were obtained. It was observed that the solution viscosity, conductivity, and average fibre diameter increase with waterlock (WL) and cross-linker additions while surface tension was not change. In addition, PAA nanofibres’ absorption capacity with water and synthetic urine was higher than PVP nanofibres, while PVP nanofibres’ absorption rate is higher. It is possible to say that electrospun nanofibrous surfaces that are ultra-thin, light, porous and with high specific surface area to volume ratio are promising for new superabsorbent materials.

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Ungur, Ganna. „Nanofibrous Filtering Materials With Catalytic Activity“. Advanced Materials Letters 5, Nr. 8 (01.08.2014): 422–28. http://dx.doi.org/10.5185/amlett.2014.amwc1025.

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Dong, Yuping, Yuqi Zheng, Keyan Zhang, Yueming Yao, Lihuan Wang, Xiaoran Li, Jianyong Yu und Bin Ding. „Electrospun Nanofibrous Materials for Wound Healing“. Advanced Fiber Materials 2, Nr. 4 (21.03.2020): 212–27. http://dx.doi.org/10.1007/s42765-020-00034-y.

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Sinha, M. K., B. R. Das, D. Bharathi, N. E. Prasad, B. Kishore, P. Raj und K. Kumar. „Electrospun Nanofibrous Materials for Biomedical Textiles“. Materials Today: Proceedings 21 (2020): 1818–26. http://dx.doi.org/10.1016/j.matpr.2020.01.236.

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Zhou, Shufei, und Wen Zhong. „Adhesion and Binding in Nanofibrous Materials“. Journal of Adhesion Science and Technology 24, Nr. 1 (Januar 2010): 35–44. http://dx.doi.org/10.1163/016942409x12538865055953.

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Zhang, Zhanpeng, und Peter X. Ma. „From Nanofibrous Hollow Microspheres to Nanofibrous Hollow Discs and Nanofibrous Shells“. Macromolecular Rapid Communications 36, Nr. 19 (06.08.2015): 1735–41. http://dx.doi.org/10.1002/marc.201500342.

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Venugopal, J., Molamma P. Prabhakaran, Yanzhong Zhang, Sharon Low, Aw Tar Choon und S. Ramakrishna. „Biomimetic hydroxyapatite-containing composite nanofibrous substrates for bone tissue engineering“. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 368, Nr. 1917 (28.04.2010): 2065–81. http://dx.doi.org/10.1098/rsta.2010.0012.

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The fracture of bones and large bone defects owing to various traumas or natural ageing is a typical type of tissue malfunction. Surgical treatment frequently requires implantation of a temporary or permanent prosthesis, which is still a challenge for orthopaedic surgeons, especially in the case of large bone defects. Mimicking nanotopography of natural extracellular matrix (ECM) is advantageous for the successful regeneration of damaged tissues or organs. Electrospun nanofibre-based synthetic and natural polymer scaffolds are being explored as a scaffold similar to natural ECM for tissue engineering applications. Nanostructured materials are smaller in size falling, in the 1–100 nm range, and have specific properties and functions related to the size of the natural materials (e.g. hydroxyapatite (HA)). The development of nanofibres with nano-HA has enhanced the scope of fabricating scaffolds to mimic the architecture of natural bone tissue. Nanofibrous substrates supporting adhesion, proliferation, differentiation of cells and HA induce the cells to secrete ECM for mineralization to form bone in bone tissue engineering. Our laboratory (NUSNNI, NUS) has been fabricating a variety of synthetic and natural polymer-based nanofibrous substrates and synthesizing HA for blending and spraying on nanofibres for generating artificial ECM for bone tissue regeneration. The present review is intended to direct the reader’s attention to the important subjects of synthetic and natural polymers with HA for bone tissue engineering.

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Yousefzadeh, Maryam, Masoud Latifi, Mohammad Amani-Tehran, Wee-Eong Teo und Seeram Ramakrishna. „A Note on the 3D Structural Design of Electrospun Nanofibers“. Journal of Engineered Fibers and Fabrics 7, Nr. 2 (Juni 2012): 155892501200700. http://dx.doi.org/10.1177/155892501200700204.

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In this paper, various three-dimensional (3D) nanofibrous structures were constructed based on liquid support systems and alteration of the solution charge property. Structures fabricated from the liquid support system include a nanofibrous ring and spindle-shaped nanofibrous ones. The ease of fabricating fluffy, randomly organized nanofibrous structure by altering the charge capacity of the electrospun solution is also demonstrated. The set-up conditions for the design of the nanofibrous structures using these techniques are discussed.

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Dissertationen zum Thema "Nanofibrous materials"

Angelikopoulos, Panagiotis. „Rational design of nanofibrous materials“. Thesis, Heriot-Watt University, 2010. http://hdl.handle.net/10399/2346.

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Making Carbon nanotubes a functional material for widespread use is a very cumbersome and challenging task. Not only do CNT materials require the tubes to be well dispersed and individualized rather than in bundles but resulting material has much poorer properties than expected due to insufficient load transfer between crossing CNT. This work tries to provide insight and solutions onto both of these problems, by employing computer simulations to reveal the dual nature of surfactant mediated forces on CNT. A generic coarse grain model has been used along with a dissipative particle dynamics thermostat and implicit solvent treatment. Results illustrate that depending on the bulk concentration of surfactants and their geometry, one can control the surfatantmediated forces on tubes being able to trigger both tube gluing or dispersion. Furthermore, an adsorption study elucidating the differences between surfactant adsorption on individual tubes and their bundles has been done. Surfactants follow a superlinear synergetic adsorption isothermon individual tubes,whereas adsorb via a Langmuir mechanism on their bundles. This work provides a solid framework of knowledge and insight regarding the nature of CNT and surfactants interaction and adsorption, providing rational arguments for the design of optimum CNT materials.

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Palazzetti, Roberto <1984&gt. „Electrospun nanofibrous interleaves in composite laminate materials“. Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5245/.

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The present work aims for investigate the influence of electrospun Nylon 6,6 nanofibrous mat on the behavior of composite laminates. The main idea is that nanofibrous interleaved into particular ply-to-ply interfaces of a laminate can lead to significant improvements of mechanical properties and delamination/damage resistance. Experimental campaigns were performed to investigate how nanofibers affect both the static and dynamic behavior of the laminate in which they are interleaved. Fracture mechanics tests were initially performed on virgin and 8 different configuration of nanomodified specimens. The purposes of this first step of the work are to understand which geometrical parameters of the nanointerleave influence the behavior of the laminate and, to find the optimal architecture of the nanofibrous mat in order to obtain the best reinforcement. In particular, 3 morphological parameters are investigated: nanofibers diameter, nanofibers orientation and thickness of the reinforce. Two different values for each parameter have been used, and it leads to 8 different configurations of nanoreinforce. Acoustic Emission technique is also used to monitor the tests. Once the optimum configuration has been found, attention is focused on the mechanism of reinforce played by the nanofibers during static and dynamic tests. Low velocity impacts and free decay tests are performed to attest the effect of nanointerlayers and the reinforce mechanism during the dynamic loads. Bump tests are performed before and after the impact on virgin and two different nanomodified laminates configurations. The authors focused their attention on: vibrational behavior, low velocity impact response and post-impact vibration behavior of the nano-interleaved laminates with respect to the response of non-nanomodified ones. Experiments attest that nanofibers significantly strength the delamination resistance of the laminates and increase some mechanical properties. It is demonstrated that the nanofibers are capable to continue to carry on the loads even when the matrix around them is broken.

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Wang, Chong, und 王翀. „Electrospun multicomponent and multifunctional nanofibrous tissue engineering scaffolds : fabrication, characteristics and biological performance“. Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/206645.

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Electrospinning has attracted great attention in the fields of tissue engineering and controlled release of drugs/biomolecules. The aim of this project was to investigate electrospinning of nanofibers with core-shell structures using emulsion electrospinning, the formation of monolithic and core-shell structured nanofibrous drug/biomolecule delivery vehicles using polymers such as poly(D,L-lactic acid) (PDLLA) and poly(lactic-co-glycolic acid) (PLGA), and the formation of multicomponent bone tissue engineering scaffolds with angiogenic property, osteoinductivity and osteoconductivity. The foundation of this project was laid by investigating monocomponent scaffolds. First, effects of properties of polymer solutions and water-in-oil (w/o) emulsions and electrospinning parameters on the morphology, diameter and structure of fibers were systematically investigated. Second, drugs (vancomycin and rifamycin) and a model protein (bovine serum albumin) were incorporated in monolithic or core-shell nanofibers via blend electrospinning or emulsion electrospinning to form single or dual delivery systems, providing fundamental understandings. Growth factors such as recombinant human bone morphogenetic protein-2 (rhBMP-2) and basic-fibroblast growth factor (b-FGF) were then incorporated in PLGA or PDLLA nanofibrous delivery vehicles. The in vitro release behaviour of drugs and biomolecules was studied. Third, calcium phosphate (Ca-P) nanoparticles were synthesized and used for fabricating Ca-P/PLGA and Ca-P/PDLLA nanocomposite scaffolds. Homogeneous distribution of Ca-P in fibrous scaffolds could be achieved. With the assistance of emulsion electrospinning and nanocomposite electrospinning, bicomponent scaffolds containing rhBMP-2 and Ca-P nanoparticles were fabricated using dual-source dual-power electrospinning. The fibrous component ratio could be varied by using multiple syringes for electrospinning fibers. The structure and properties, including in vitro release behaviour, of mono- and bicomponent scaffolds were studied in detail. Tricomponent scaffolds incorporated with recombinant human vein endothelial growth factor (rhVEGF), rhBMP-2 and Ca-P nanoparticles were subsequently fabricated using multi-source dual-power electrospinning. To achieve a sequential release of firstly rhVEGF and then rhBMP-2, PLGA/polyethylene glycol (PEG) blends and PLGA were used for incorporating rhVEGF and rhBMP-2, respectively. For tricomponent scaffolds with different component ratios, different release amounts but similar release profiles could be achieved for the growth factors. In vitro biological investigations were conducted for mono-, bi- and tricomponent scaffolds. Pre-osteoblast cells (MC3T3-E1) were found to attach, spread, proliferate and express alkaline phosphatase (ALP) activity on rhBMP-2 and Ca-P nanoparticle incorporated bicomponent scaffolds. Calcium deposition was also observed in cells cultured with bicomponent scaffolds. Human umbilical vein endothelial cells (HUVECs) were found to attach, spread, proliferate on tricomponent scaffolds and rhVEGF released from mono-, bi- and tricomponent scaffolds could facilitate cell proliferation and migration, indicating released rhVEGF could promote angiogenesis. C3H10T1/2 cell line and human bone marrow derived mesenchymal stem cells (hBMSCs) were found to attach, spread and proliferate on bi- and tricomponent scaffolds. As compared with cells seeded on monocomponent scaffolds, C3H10T1/2 cells and hBMSCs on bi- and tricomponent scaffolds expressed higher ALP activity. Enhanced mineralization was observed for C3H10T1/2 cells and hBMSCs seeded bicomponent scaffolds comprising rhBMP-2/PLGA and Ca-P/PLGA fibers and also tricomponent scaffolds. hBMSCs seeded on rhBMP-2/PLGA and Ca-P/PLGA monocomponent scaffolds expressed abundant F-actin and vinculin, while bicomponent and tricomponent scaffolds induced much more F-actin and vinculin expression.
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Liang, Meng. „Spatial organization of electric charges and discharge kinetics of nanofibers elaborated by electrospinning : application to the elaboration of 3D structured nanofibrous materials“. Thesis, Strasbourg, 2020. http://www.theses.fr/2020STRAE002.

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L’electrospinning est un procédé permettant la production de matériaux nanofibreux sous l'action d'un champ électrostatique intense. Au cours du procédé, une solution de polymère en régime semi-dilué enchevêtré est introduite dans une aiguille métallique soumise à un potentiel électrique élevé. Lorsque le champ électrique entre l'aiguille et une contre-électrode métallique reliée à la terre électrique, appelée collecteur, est suffisamment fort (de l’ordre de 1 kV/cm), un jet de la solution est violemment éjecté vers le collecteur. Pendant le vol entre l'aiguille et le collecteur, le jet est soumis à des instabilités électro-hydrodynamiques qui provoquent des mouvements de fouet favorisant l'évaporation du solvant et la réduction du diamètre. Après un temps de vol de quelques ms, une nanofibre polymère solide est déposée sur le collecteur sous la forme d’un scaffold non-tissé. Lorsque la nanofibre chargée électriquement est mise en contact avec le collecteur, elle se décharge progressivement. La cinétique de la décharge électrique mais aussi la façon dont les charges sont réparties à la surface du matériau pendant le procédé déterminent l'organisation et la structuration 3D finale du scaffold.Les travaux de cette thèse ont consisté à mesurer les charges électriques portées par la nanofibre lors de son dépôt mais aussi à étudier comment ces charges se dissipent dans la membrane et dans le temps, une fois la nanofibre déposée. Cette étude a ensuite été appliquée au développement de scaffolds nanofibreux de structure contrôlée en 3D
Electrospinning is a process allowing the production of nanofibrous materials under the action of an intense electrostatic field. During the process, a polymer solution in a semi-diluted entangled regime is fed to a metal needle submitted to a high electrical potential. When the electric field between the needle and a metal counter electrode connected to the electrical ground, called a collector, is strong enough (i.e. about 1 kV/cm), a jet of the solution is violently ejected towards the collector. During the flight between the needle and the collector, the jet is subjected to electro-hydro-dynamic instabilities resulting in whipping movements that promote solvent evaporation and diameter reduction. After a flight time of a few ms, a solid polymer nanofiber in the form of a non-woven membrane is deposited on the collector. When the electrically charged nanofibre is brought into contact with the collector, it gradually discharges. The kinetics of electrical discharge but also the way in which the charges are distributed on the surface of the material during the process determine the organization and the final 3D structuring of the membrane.The work of this thesis consisted in measuring the electrical charges carried by the nanofibre during its deposition but also in studying how these charges dissipate in the membrane and over time once the nanofibre has been deposited. This study was then applied to develop nanofiber membranes with a controlled 3D structure

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Tchang, Cervin Nicholas. „Porous Materials from Cellulose Nanofibrils“. Doctoral thesis, KTH, Fiberteknologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-155065.

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In the first part of this work a novel type of low-density, sponge-like material for the separation of mixtures of oil and water has been prepared by vapour deposition of hydrophobic tri-chloro-silanes on ultra-porous cellulose nanofibril (CNF) aerogels. To achieve this, a highly porous (>99%) robust CNF aerogel with high structural flexibility is first formed by freeze-drying an aqueous suspension of the CNFs. The density, pore size distribution and wetting properties of the aerogel can be tuned by selecting the concentration of the CNF suspension before freeze-drying. The hydrophobic light-weight aerogels are almost instantly filled with the oil phase when they selectively absorb oil from water, with a capacity to absorb up to 45 times their own weight. The oil can subsequently be drained from the aerogel and the aerogel can then be subjected to a second absorption cycle. The second part is about aerogels with different pore structures and manufactured with freeze-drying and supercritical carbon dioxide for the preparation of super slippery surfaces. Tunable super slippery liquid-infused porous surfaces (SLIPS) were fabricated through fluorination of CNFsand subsequent infusion with perfluorinated liquid lubricants. CNF-based self-standing membranes repelled water and hexadecane with roll-off angles of only a few degrees. The lifetime of the slippery surface was controlled by the rate of evaporation of the lubricant, where the low roll-off angle could be regained with additional infusion. Moreover, adjusting the porosity of the membranes allowed the amount of infused lubricant to be tuned and thereby the lifetime. The CNF-based process permitted the expansion of the concept to coatings on glass, steel, paper and silicon. The lubricant-infused films and coatings are optically transparent and also feature self-cleaning and self-repairing abilities. The third part describes how porous structures from CNFs can be prepared in a new way by using a Pickering foam technique to create CNF-stabilized foams. This technique is promising for up-scaling to enable these porous nanostructured cellulose materials to be produced on a large scale. With this technique, a novel, lightweight and strong porous cellulose material has been prepared by drying aqueous foams stabilized with surface-modified CNFs. Confocal microscopy and high-speed video imaging show that the long-term stability of the wet foams can be attributed to the octylamine-coated, rod-shaped CNF nanoparticles residing at the air-liquid interface which prevent the air bubbles from collapsing or coalescing. Careful removal of the water yields a porous cellulose-based material with a porosity of 98 %, and measurements with an autoporosimeter (APVD) reveal that most pores have a radius in the range of 300 to 500 μm. In the fourth part, the aim was to clarify the mechanisms behind the stabilizing action of CNFs in wet-stable cellulose foams. Factors that have been investigated are the importance of the surface energy of the stabilizing CNF particles, their aspect ratio and charge density, and the concentration of CNF particles at the air-water interface. In order to investigate these parameters, the viscoelastic properties of the interface have been evaluated using the pendant drop method. The properties of the interface have also been compared by foam stability tests to clarify how the interface properties can be related to the foam stability over time. The most important results and conclusions are that CNFs can be used as stabilizing particles for aqueous foams already at a concentration as low as 5 g/L. The reasons for this are the high aspect ratio which is important for gel formation and the viscoelastic modulus of the air-water interface. Foams stabilized with CNFs are therefore much more stable than foams stabilized by cellulose nanocrystals (CNC). The charge density of the CNFs affects the level of liberation of the CNFs within large CNF aggregates and hence the number of contact points at the interface, and also the gel formation and viscoelastic modulus. The charges also lead to a disjoining pressure related to the long-range repulsive electrostatic interaction between the stabilized bubbles, and this contributes to foam stability. In the fifth part, the aim was to develop the drying procedure in order to producea dry porous CNF material using the wet foam as a precursor and to evaluate the dry foam properties. The wet foam was dried in an oven while placed on a liquid-filled porous ceramic frit to preserve and enhance the porous structure in the dried material and prevent the formation of larger cavities and disruptions. The cell structure has been studied by SEM microscopy and APVD (automatic pore volume distribution). The mechanical properties have been studied by a tensile tester (Instron 5566) and the liquid absorption ability with the aid of the APVD-equipment. By changing the charge density of the CNFs it is possible to prepare dry foams with different densities and the lowest density was found to be 6 kg m-3with a porosity of 99.6 %. The Young ́s modulus in compression was 50 MPa and the energy absorption was 2340kJ m-3 for foams with a density of 200 kg m-3. The liquid absorption of the foam with a density of 13 kg m-3 is 34 times its own weight. By chemically cross-linking the foam,it wasalso possible to empty the liquid-filled foams by compression and then to reabsorb the liquid to the same degree with maintained foam integrity. This new processing method also shows great promise for preparing low-density cellulose foams continuously and could be very suitable for industrial up-scaling.

QC 20141103

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Butchosa, Robles Núria. „Tailoring Cellulose Nanofibrils for Advanced Materials“. Doctoral thesis, KTH, Biokompositer, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-155056.

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Cellulose nanofibrils (CNFs) are nanoscale fibers of high aspect ratio that can be isolated from a wide variety of cellulosic sources, including wood and bacterial cellulose. With high strength despite of their low density, CNFs are a promising renewable building block for the preparation of nanostructured materials and composites. To fabricate CNF-based materials with improved inherent rheological and mechanical properties and additional new functionalities, it is essential to tailor the surface properties of individual CNFs. The surface structures control the interactions between CNFs and ultimately dictate the structure and macroscale properties of the bulk material. In this thesis we have demonstrated different approaches, ranging from non-covalent adsorption and covalent chemical modification to modification of cellulose biosynthesis, to tailor the structure and surface functionalities of CNFs for the fabrication of advanced materials. These materials possess enhanced properties such as water-redispersibility, water absorbency, dye adsorption capacity, antibacterial activity, and mechanical properties. In Paper I, CNFs were modified via the irreversible adsorption of carboxymethyl cellulose (CMC). The adsorption of small amounts of CMC onto the surface of CNFs prevented agglomeration and co-crystallization of the nanofibrils upon drying, and allowed the recovery of rheological and mechanical properties after redispersion of dried CNF samples. In Paper II, CNFs bearing permanent cationic charges were prepared through quaternization of wood pulp fibers followed by mechanical disintegration. The activation of the hydroxyl groups on pulp fibers by alkaline treatment was optimized prior to quaternization. This optimization resulted in individual CNFs with uniform width and tunable cationic charge densities. These cationic CNFs demonstrated ultrahigh water absorbency and high adsorption capacity for anionic dyes. In Paper III, via a similar approach as in Paper II, CNFs bearing polyethylene glycol (PEG) were prepared by covalently grafting PEG to carboxylated pulp fibers prior to mechanical disintegration. CNFs with a high surface chain density of PEG and a uniform width were oriented to produce macroscopic ribbons simply by mechanical stretching of the CNF hydrogel network before drying. The uniform grafted thin monolayer of PEG on the surface of individual CNFs prevented the agglomeration of CNFs and facilitated their alignment upon mechanical stretching, thus resulted in ribbons with ultrahigh tensile strength and modulus. These optically transparent ribbons also demonstrated interesting biaxial light scattering behavior. In Paper IV, bacterial cellulose (BC) was modified by the addition of chitin nanocrystals (ChNCs) into the growing culture medium of the bacteria Acetobacter aceti which secretes cellulose in the form of entangled nanofibers. This led to the in situ incorporation of ChNCs into the BC nanofibers network and resulted in BC/ChNC nanocomposites exhibiting bactericidal activity. Further, blending of BC nanofibers with ChNCs produced nanocomposite films with relatively lower tensile strength and modulus compared to the in situ cultivated ones. The bactericidal activity increased significantly with increasing amount of ChNCs for nanocomposites prepared by direct mixing of BC nanofibers and ChNCs. In Paper V, CNFs were isolated from suspension-cultured wild-type (WT) and cellulose-binding module (CBM) transformed tobacco BY-2 (Nicotiana tabacum L. cv bright yellow) cells. Results from strong sulfuric acid hydrolysis indicated that CNFs from transgenic cells overexpressing CBM consisted of longer cellulose nanocrystals compared to CNFs from WT cells. Nanopapers prepared from CNFs of transgenic cells demonstrated significantly enhanced toughness compared to CNFs of WT cells.

QC 20141103

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Zadorosny, Lincon [UNESP]. „Produção e caracterização de micro e nanofibras de Poli(fluoreto de vinilideno) - PVDF obtidos pela técnica de fiação por sopro em solução“. Universidade Estadual Paulista (UNESP), 2013. http://hdl.handle.net/11449/91972.

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Nanofibras poliméricas de poli(fluoreto de vinilideno) – PVDF – foram produzidas pela técnica de fiação por sopro em solução (FSS) a partir de soluções de PVDF/N,N, Dimetilformamida – DMF. Foram estudadas as influências da variação da concentração polimérica (15, 20, 25 e 30%, m/v), distância de trabalho (15, 18, 21 e 24 cm), taxa de alimentação (19, 38 e 76 μL/min), e pressão do gás (100, 140 e 180 kPa), sobre a morfologia e diâmetro das nanoestruturas. O diâmetro médio das nanofibras obtidas variou entre 91 e 245 nm. Imagens de MEV apontam que, dentre os parâmetros estudados, o que promoveu maior alteração morfológica das nanofibras foi a concentração polimérica, fator diretamente relacionado à viscosidade da solução. A variação dos demais parâmetros promoveu menores alterações tanto estruturais quanto morfológicas nos filmes nanofibrosos. Análises termogravimétricas (TGA) revelaram que os filmes são termicamente estáveis até uma temperatura de 420 °C. Difratometria de raios X (DRX) indicaram a presença das fases cristalinas α e β, sendo a fase β mais evidenciada para as nanofibras e PVDF casting. O filme obtido por FSS apresentou maior ângulo de contato, demostrando ser mais hidrofóbico. Ensaios de tensão deformação mostraram que os filmes nanofibrosos apresentaram uma deformação até a ruptura de 72%, cerca de 1,7 e 3,1 vezes maior que os obtidos por casting e prensagem a quente, respectivamente. Verificou-se também um decréscimo no módulo de elasticidade e do limite de resistência à tração das nanofibras, comparativamente aos outros filmes
Poly(vinylidene fluoride) – PVDF Nanofibers were produced by solution blow spinning technique (SBS) from solutions PVDF/N,N, Dimethylformamide – DMF. It was investigated the influence of the polymeric concentration (15, 20, 25 e 30% w/v), work distance (15, 18, 21 and 24 cm), feed rate (19, 38 e 76 μL/min), and gas pressure (100, 140 e 180 kPa), on the morphology of the nanostructure and diameter of the nanofibers. The average diameter of the obtained nanostructure was on the range 91 - 245 nm. SEM images show that, among the studied parameters, the concentration of the solution promoted the grater changes in the morphology of the polymer nanofibers. Such factor is directly related to the viscosity of the solution. Variation of the other parameters promoted both structural and morphological changes in the nanofiber films. Termograviometric analyses showed that the films are thermally stable up to 420°C. X-ray diffraction (XRD) indicated the presence of the crystalline phases α and β. However, the β phase is more evident in the nanofibers and in the PVDF casting. The films obtained by SBS showed higher contact angle, which means that they are more hydrophobic. Stress-strain tests showed that nanofiber films had a break deformation of 72%, approximately 1.7 and 3.1 times higher than those obtained by casting and hot pressing, respectively. There was also a decrease in the elastic modulus and in the tensile strength of the PVDF nanofibers when compared with the other films

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Zadorosny, Lincon. „Produção e caracterização de micro e nanofibras de Poli(fluoreto de vinilideno) - PVDF obtidos pela técnica de fiação por sopro em solução /“. Ilha Solteira, 2013. http://hdl.handle.net/11449/91972.

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Orientador: Luiz Francisco Malmonge
Banca: Walter Katsumi Sakamoto
Banca: Antonio Riul Júnior
Resumo: Nanofibras poliméricas de poli(fluoreto de vinilideno) - PVDF - foram produzidas pela técnica de fiação por sopro em solução (FSS) a partir de soluções de PVDF/N,N, Dimetilformamida - DMF. Foram estudadas as influências da variação da concentração polimérica (15, 20, 25 e 30%, m/v), distância de trabalho (15, 18, 21 e 24 cm), taxa de alimentação (19, 38 e 76 μL/min), e pressão do gás (100, 140 e 180 kPa), sobre a morfologia e diâmetro das nanoestruturas. O diâmetro médio das nanofibras obtidas variou entre 91 e 245 nm. Imagens de MEV apontam que, dentre os parâmetros estudados, o que promoveu maior alteração morfológica das nanofibras foi a concentração polimérica, fator diretamente relacionado à viscosidade da solução. A variação dos demais parâmetros promoveu menores alterações tanto estruturais quanto morfológicas nos filmes nanofibrosos. Análises termogravimétricas (TGA) revelaram que os filmes são termicamente estáveis até uma temperatura de 420 °C. Difratometria de raios X (DRX) indicaram a presença das fases cristalinas α e β, sendo a fase β mais evidenciada para as nanofibras e PVDF casting. O filme obtido por FSS apresentou maior ângulo de contato, demostrando ser mais hidrofóbico. Ensaios de tensão deformação mostraram que os filmes nanofibrosos apresentaram uma deformação até a ruptura de 72%, cerca de 1,7 e 3,1 vezes maior que os obtidos por casting e prensagem a quente, respectivamente. Verificou-se também um decréscimo no módulo de elasticidade e do limite de resistência à tração das nanofibras, comparativamente aos outros filmes
Abstract: Poly(vinylidene fluoride) - PVDF Nanofibers were produced by solution blow spinning technique (SBS) from solutions PVDF/N,N, Dimethylformamide - DMF. It was investigated the influence of the polymeric concentration (15, 20, 25 e 30% w/v), work distance (15, 18, 21 and 24 cm), feed rate (19, 38 e 76 μL/min), and gas pressure (100, 140 e 180 kPa), on the morphology of the nanostructure and diameter of the nanofibers. The average diameter of the obtained nanostructure was on the range 91 - 245 nm. SEM images show that, among the studied parameters, the concentration of the solution promoted the grater changes in the morphology of the polymer nanofibers. Such factor is directly related to the viscosity of the solution. Variation of the other parameters promoted both structural and morphological changes in the nanofiber films. Termograviometric analyses showed that the films are thermally stable up to 420°C. X-ray diffraction (XRD) indicated the presence of the crystalline phases α and β. However, the β phase is more evident in the nanofibers and in the PVDF casting. The films obtained by SBS showed higher contact angle, which means that they are more hydrophobic. Stress-strain tests showed that nanofiber films had a break deformation of 72%, approximately 1.7 and 3.1 times higher than those obtained by casting and hot pressing, respectively. There was also a decrease in the elastic modulus and in the tensile strength of the PVDF nanofibers when compared with the other films
Mestre

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Neves, Roberta Motta. „Produção e caracterização de nanocompósitos expandidos de poliestireno, reforçados com nanofibras e nanowhiskers de celulose obtidas a partir de fibra de curauá“. reponame:Repositório Institucional da UCS, 2017. https://repositorio.ucs.br/handle/11338/3474.

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A busca por materiais de origem natural, com menos impacto ambiental e com as mesmas propriedades de materis sintéticos está cada vez mais em foco nas pesquisas na área de engenharia. Um modo de fazer isto é o desenvolvimento de nancompósitos reforçados por materiais oriundos de fibras naturais visto que estas possuem em sua estrutura celulose e a celulose é o composto presente em maior quantidade no planeta. Dentro dos nanocompósitos existe a classe dos nanocompósitos expandidos que combinam boas propriedades mecânicas com densidade reduzida e capacidade superior de isolamento térmico e acústico, quando comparados aos nanocompósitos convencionais não expandidos. Nanocompósitos expandidos são materiais que possuem pelo menos três fases: uma contínua (matriz polimérica), a fase dispersa (elementos de reforço) e a presença de espaços vazios no interior da estrutura, denominadas células. O poliestireno (PS) é um polímero muito utilizado na produção de materiais expandidos. Nesse sentido, o presente estudo tem por objetivo, primeiramente a obtenção das nanofibras (NFC) e nanowhiskers (NWC) de celulose ambas extraídas de fibras de curauá (FC). As NFC foram obtidas pelo processo de desfibrilação e os NWC a partir do método de oxidação. Estas foram caracterizadas quanto sua morfologia por microscopia eletrônica de transmissão (MET), microscopia eletrônica de varredura com emissão de campo (MEV-FEG), grau de polimerização (GP), quanto sua estrutura cristalina (DRX), quanto suas propriedades térmicas (TG) e quanto a estrutura química (FTIR). Após, ocorreu o desenvolvimento de nanocompósitos de poliestireno (PS) reforçado com NFC e NWC, nas seguintes concentrações de reforço: 0,25%, 0,50% e 1,00% (m/m). Avaliou-se a influência da incorporação dos reforços na matriz por DMA onde observou-se um aumento no módulo de armazenamento e de perda para todos os nanocompósitos, em relação ao PS sem reforço. Após os nanocompósitos foram expandidos utilizando dióxido de carbono em estado supercrítico como agente expansor e os nanocompósitos expandidos foram avaliados por propriedades mecânicas (resistência à compressão), na morfologia final do nanocompósito expandido por MEV-FEG e por distribuição de tamanho de células. Nos nanocompósitos expandidos, a incorporação das NFC promoveu um aumento na resistência a compressão e uma diminuição no tamanho de células, quando comparado as amostras reforçadas com NWC e PS puro. De modo geral, a incorporação dos NWC nos nanocompósitos antes da expansão proporcionaram melhores resultados quando comprados ao reforçados com NFC. Por poutro lado a incorporação de NFC nos nanocompósitos expandidos proporcionaram melhores resultados quando comparados aos reforçados com NWC.
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The search for materials of natural origin, with less environmental impact and with the same properties of synthetic materials is increasingly focused on research in the field of engineering. One way to doing this is a development of nanocomposites reinforced with materials obtained from natural fibers, because that have on your biologic structure cellulose and the cellulose is present in greater quantity in the planet. Within the nanocomposites there is a class of expanded nanocomposites that combine good mechanical properties with reduced density and superior capacity of thermal and acoustic insulation when compared to conventional non-expanded nanocomposites. Expanded nanocomposites are materials that have at least three phases: a continuous (polymer matrix), the dispersed phase (reinforcing elements) and the presence of voids inside the structure, called cells. Polystyrene (PS) is a polymer widely used in the production of expanded materials. In this sense, the aim of the present study were firstly to obtain nanofibers (NFC) and nanowhiskers (NWC) of cellulose both extracted from curauá fibers (CF). The NFCs were obtained by the defibrillation process and the NWC from the oxidation method. These were characterized by their transmission electron microscopy (TEM), scanning electron microscopy with field emission (SEM), degree of polymerization (GP), their crystalline structure (XRD), and their thermal properties (TG) and the chemical structure by Fourier-transform infrared spectroscopy (FTIR). After that, the next step was the development of PS/NFC and PS/NWC nanocomposites in the following reinforcement concentrations: 0.25%, 0.50% and 1.00% (w/w). The influence of the incorporation of the reinforcements in the matrix by DMA was evaluated, where an increase in the storage and loss modulus was observed for all the nanocomposites, in relation to the PS without reinforcement. After the nanocomposites were expanded using carbon dioxide in the supercritical state as an expander and the expanded nanocomposites were evaluated by mechanical properties (compressive strength), in the final morphology of the expanded nanocomposite by SEM and by cell size distribution. In the expanded nanocomposites, the incorporation of the NFC promoted an increase in the compressive strength and a decrease in the cell size when compared to the samples reinforced with NWC and pure PS. In general, the incorporation of NWC in nanocomposites prior to expansion provided better results when purchased from NFC-reinforced ones. On the other hand, the incorporation of NFC in the expanded nanocomposites provided better results when compared to those reinforced with NWC.

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Li, Shuangwu. „Surface properties of electrospun polymer nanofibres“. Thesis, Queen Mary, University of London, 2010. http://qmro.qmul.ac.uk/xmlui/handle/123456789/548.

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Fibrous materials are used in a variety of applications due to their relatively high surface area to volume ratio as well as anisotropic behaviour. Electrospinning is a popular fabrication technique which produces polymer nanofibres with a potentially high molecular orientation. The surface of polymer fibres plays a significant role in many applications thus measurement of their surface properties is essential but challenging due to their relatively small size. In this thesis, ultrafine nanofibres have been produced by electrospinning with their nanofibre morphology controlled by varying different processing parameters. Atomic force microscopy (AFM) adhesion contact mechanics and individual nanofibre wetting measurements have been conducted to explore surface properties of the produced electrospun polymer fibres. Results using traditional Owens-Wendt plots applied to our nanomaterials show electrospun nanofibres have a higher dispersive surface free energy compared to bulk polymer film but a lower polar contribution, giving a total surface free energy in excess of bulk equivalents. A novel proposed model indicates that this nanofibre dispersive surface free energy is intimately linked to density of the polymer and ultimately the molecular spacing or orientation for the polymer chains. Comparisons are made with bulk polymer films to show that a high degree of molecular orientation is present at least at the surface of the polymer nanofibre. Structure investigations on electrospun fibres of polyvinyl alcohol using FTIR and XPS surface techniques explore how an increase in hydrogen bonds formed within nanofibres rather than on the fibre surface enhance this dispersive contribution but lowers the polar contribution. The wetting behaviour of electrospun fibre is extended to assemblies at length scales above individual fibres to highlight how superhydrophobic surfaces can be produced from nanofibre networks with defined spacings and geometries. This superhydrophobicity was adequately described by a Cassie-Baxter model modified to account for the fibrous geometry.

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Bücher zum Thema "Nanofibrous materials"

Guceri, Selcuk, Yuri G. Gogotsi und Vladimir Kuznetsov, Hrsg. Nanoengineered Nanofibrous Materials. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2550-1.

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Wang, Ce, und Yanbo Liu. Advanced Nanofibrous Materials Manufacture Technology Based on Electrospinning. Taylor & Francis Group, 2019.

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Wang, Ce, und Yanbo Liu. Advanced Nanofibrous Materials Manufacture Technology Based on Electrospinning. Taylor & Francis Group, 2019.

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Wang, Ce, und Yanbo Liu. Advanced Nanofibrous Materials Manufacture Technology Based on Electrospinning. Taylor & Francis Group, 2019.

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Wang, Ce, und Yanbo Liu. Advanced Nanofibrous Materials Manufacture Technology Based on Electrospinning. Taylor & Francis Group, 2019.

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Advanced Nanofibrous Materials Manufacture Technology Based on Electrospinning. Taylor & Francis Group, 2019.

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(Adapter), Jennifer Wright, Selcuk Guceri (Editor), Yury G. Gogotsi (Editor) und Vladimir Kuznetsov (Editor), Hrsg. Nanoengineered Nanofibrous Materials (NATO Science Series II: Mathematics, Physics and Chemistry). Springer, 2004.

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(Adapter), Jennifer Wright, Selcuk Guceri (Editor), Yury G. Gogotsi (Editor) und Vladimir Kuznetsov (Editor), Hrsg. Nanoengineered Nanofibrous Materials (Nato Science Series II: Mathematics, Physics and Chemistry). Springer, 2004.

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Buchteile zum Thema "Nanofibrous materials"

Yoda, Minami, Jean-Luc Garden, Olivier Bourgeois, Aeraj Haque, Aloke Kumar, Hans Deyhle, Simone Hieber et al. „Nanofibrous Materials and Composites“. In Encyclopedia of Nanotechnology, 1543. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-90-481-9751-4_100498.

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Wang, Wei, Zhigao Zhu, Qiao Wang und Ruisha Shi. „Functionalization of Electrospun Nanofibrous Materials“. In Advanced Nanofibrous Materials Manufacture Technology Based on Electrospinning, 243–82. Boca Raton, FL : Taylor & Francis Group, LLC, CRC Press is an imprint of Taylor & Francis Group, an Informa Business, [2018]: CRC Press, 2019. http://dx.doi.org/10.1201/9780429085765-8.

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Palit, Sukanchan. „Carbon Nanotubes and its Applications in Diverse Areas of Science and Engineering: A Critical Overview“. In Engineered Carbon Nanotubes and Nanofibrous Materials, 1–27. Toronto ; New Jersey : Apple Academic Press, 2019. | Series: AAP research notes on nanoscience and nanotechnology: Apple Academic Press, 2018. http://dx.doi.org/10.1201/9781351048125-1.

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Palit, Sukanchan. „Engineered Nanomaterials, Nanomaterials, and Carbon Nanotubes: A Vision for the Future“. In Engineered Carbon Nanotubes and Nanofibrous Materials, 29–53. Toronto ; New Jersey : Apple Academic Press, 2019. | Series: AAP research notes on nanoscience and nanotechnology: Apple Academic Press, 2018. http://dx.doi.org/10.1201/9781351048125-2.

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Abraham, Jiji, Kalarikkal Nandakumar, C. George Soney und Thomas Sabu. „Surface Characteristics of Ionic Liquid-Modified Multiwalled Carbon Nanotube-Based Styrene-Butadiene Rubber Nanocomposites: Contact Angle Studies“. In Engineered Carbon Nanotubes and Nanofibrous Materials, 55–71. Toronto ; New Jersey : Apple Academic Press, 2019. | Series: AAP research notes on nanoscience and nanotechnology: Apple Academic Press, 2018. http://dx.doi.org/10.1201/9781351048125-3.

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Esmaeili, M., R. Ansari und A. K. Haghi. „Progress on Carbon Nanotube Pull-Out Simulation With Particular Application on Polymer Matrix Via Finite Element Model Method“. In Engineered Carbon Nanotubes and Nanofibrous Materials, 73–99. Toronto ; New Jersey : Apple Academic Press, 2019. | Series: AAP research notes on nanoscience and nanotechnology: Apple Academic Press, 2018. http://dx.doi.org/10.1201/9781351048125-4.

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Palit, Sukanchan. „Environmental Engineering Applications of Carbon Nanotubes: A Critical Overview and a Vision for the Future“. In Engineered Carbon Nanotubes and Nanofibrous Materials, 101–26. Toronto ; New Jersey : Apple Academic Press, 2019. | Series: AAP research notes on nanoscience and nanotechnology: Apple Academic Press, 2018. http://dx.doi.org/10.1201/9781351048125-5.

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Iqbal, Sajid, Rangnath Ravi, Anujit Ghosal, Jaydeep Bhattacharya und Sharif Ahmad. „Advances in Carbon Nanotube-Based Conducting Polymer Composites“. In Engineered Carbon Nanotubes and Nanofibrous Materials, 127–41. Toronto ; New Jersey : Apple Academic Press, 2019. | Series: AAP research notes on nanoscience and nanotechnology: Apple Academic Press, 2018. http://dx.doi.org/10.1201/9781351048125-6.

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Ravi, Rangnath, Sajid Iqbal, Ghosal Anujit und Ahmad Sharif. „Carbon Nanotubes-Based Adsorbent: An Efficient Water Purification Technology“. In Engineered Carbon Nanotubes and Nanofibrous Materials, 143–66. Toronto ; New Jersey : Apple Academic Press, 2019. | Series: AAP research notes on nanoscience and nanotechnology: Apple Academic Press, 2018. http://dx.doi.org/10.1201/9781351048125-7.

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Zafar, Fahmina, Eram Sharmin, Hina Zafar und Nahid Nishat. „Polylactic Acid/Carbon Nanotubes-Based Nanocomposites for Biomedical Applications“. In Engineered Carbon Nanotubes and Nanofibrous Materials, 167–86. Toronto ; New Jersey : Apple Academic Press, 2019. | Series: AAP research notes on nanoscience and nanotechnology: Apple Academic Press, 2018. http://dx.doi.org/10.1201/9781351048125-8.

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Konferenzberichte zum Thema "Nanofibrous materials"

Lyubun, German P., und Nadezda O. Bessudnova. „A comparative evaluation of mechanical properties of nanofibrous materials“. In Saratov Fall Meeting 2013, herausgegeben von Elina A. Genina, Vladimir L. Derbov, Igor Meglinski und Valery V. Tuchin. SPIE, 2014. http://dx.doi.org/10.1117/12.2051930.

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Patel, Khyati K., Ashish N. Aphale, Isaac G. Macwan, Miad Faezipour und Prabir K. Patra. „Polycaprolactone nanofibrous materials as an efficient dry eye test strip“. In 2014 Health Innovations and POCT. IEEE, 2014. http://dx.doi.org/10.1109/hic.2014.7038885.

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Fridrichová, L., M. Frydrych, M. Herclík, R. Knížek und K. Mayerová. „Nanofibrous membrane as a moisture barrier“. In THE 3RD JOINT INTERNATIONAL CONFERENCE ON ENERGY ENGINEERING AND SMART MATERIALS (ICEESM-2018) AND INTERNATIONAL CONFERENCE ON NANOTECHNOLOGY AND NANOMATERIALS IN ENERGY (ICNNE-2018). Author(s), 2018. http://dx.doi.org/10.1063/1.5051103.

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Sahoo, Bibhuti Bhusan, Ipsita Priyadarshini und Bibekananda Sundaray. „Study of mechanical properties of electrospun polyacrylonitrile nanofibrous membrane“. In NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0061272.

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Onyilagha, Obiora U., Yichun Ding und Zhengtao Zhu. „Freestanding electrospun nanofibrous materials embedded in elastomers for stretchable strain sensors“. In Micro- and Nanotechnology Sensors, Systems, and Applications XI, herausgegeben von M. Saif Islam und Thomas George. SPIE, 2019. http://dx.doi.org/10.1117/12.2517160.

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Liangxi Li, Jonathan E. Cook, Zhongyang Cheng und Xinyu Zhang. „PVDF/PPy nanofibrous membranes for peripheral nerve lesion treatments“. In 2017 Joint IEEE International Symposium on the Applications of Ferroelectric (ISAF)/International Workshop on Acoustic Transduction Materials and Devices (IWATMD)/Piezoresponse Force Microscopy (PFM). IEEE, 2017. http://dx.doi.org/10.1109/isaf.2017.8000209.

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Balashov, V., E. Chepeleva, V. Tsvelaya, M. Slotvitsky, S. Pavlova, A. Ponomarenko, A. Dokuchaeva et al. „Use of polylactic nanofibrous scaffolds as a substrate for cardiomyocytes cultivation“. In PROCEEDINGS OF THE ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES. Author(s), 2018. http://dx.doi.org/10.1063/1.5083267.

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Wei, Ning, Ran Xu und Rongzhi Tang. „Immobilization of Horseradish Peroxidase on Modified Electrospun Nanofibrous Membrane for 2,4-Dichlorophenol Removal“. In The Second International Conference on Materials Chemistry and Environmental Protection. SCITEPRESS - Science and Technology Publications, 2018. http://dx.doi.org/10.5220/0008188902830292.

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Tyurin, Alexander I., Vyacheslav V. Rodaev, Vladimir M. Vasyukov und Tatiana S. Pirozhkova. „Development of new nanofibrous ceramics based on zirconium dioxide for catalytic application“. In PROCEEDINGS OF THE ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES. Author(s), 2018. http://dx.doi.org/10.1063/1.5083556.

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Kouhi, Monireh, Mohammadhossein Fathi, Jayarama Reddy Venugopal, Morteza Shamanian und Seeram Ramakrishna. „Preparation and characterization of biohybrid poly (3-hydroxybutyrate-co-3-hydroxyvalerate) based nanofibrous scaffolds“. In 6TH INTERNATIONAL BIENNIAL CONFERENCE ON ULTRAFINE GRAINED AND NANOSTRUCTURED MATERIALS: (UFGNSM2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5018946.

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Berichte der Organisationen zum Thema "Nanofibrous materials"

Zhigilei, Leonid V. Scaling Laws and Mesoscopic Modeling of Heat Transfer in Nanofibrous Materials and Composites. Fort Belvoir, VA: Defense Technical Information Center, November 2013. http://dx.doi.org/10.21236/ada595916.

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