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Dissertations / Theses on the topic 'Nanofibrous materials'

Author: Grafiati

Published: 28 June 2021

Last updated: 29 July 2025

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1

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 the

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2

Palazzetti, Roberto <1984&gt. "Electrospun nanofibrous interleaves in composite laminate materials." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5245/1/Tesi.pdf.

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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 speci

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3

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 speci

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4

Wang, Chong, and 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 fou

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5

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 so

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6

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 ligh

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7

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 ul

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8

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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Made available in DSpace on 2014-06-11T19:25:33Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-03-04Bitstream added on 2014-06-13T19:12:23Z : No. of bitstreams: 1 zadorosny_l_me_ilha.pdf: 3393568 bytes, checksum: b39b59b685225b543349760ff3d66599 (MD5)<br>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

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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<br>Banca: Walter Katsumi Sakamoto<br>Banca: Antonio Riul Júnior<br>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 nanofibra

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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 acúst

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11

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 diffe

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12

Calíope, Priscila Braga. "Caracterização de nanofibras através de técnicas de processamento de imagens." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/3/3142/tde-28102009-172405/.

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O electrospinning (deposição eletrostática) representa um método simples e conveniente para preparar bras poliméricas e bras cerâmicas com interiores sólidos ou ocos, excepcionalmente longos em comprimento, uniformes no diâmetro, variando no intervalo de dezenas de nanômetros a vários micrômetros, com diversicadas composições. Apesar da potencialidade e versatilidade da Microscopia Eletrônica de Varredura existe um grande problema de caracterizar nanobras, já que este processo não é feito automaticamente. Este trabalho apresenta uma nova metodologia para extração automática de medidas em image

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13

Törneman, Hedda. "Development of a porous material from cellulose nanofibrils." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-179266.

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Cellulose nanofibrils are a biobased and renewable material with potential to be used in many different applications. Such applications include air filtration, absorption of liquids, and thermal insulation. To be used for these applications the cellulose nanofibrils must form a porous and dry material. However, maintaining some degree of porosity after drying is difficult, since the fibrils are extracted in liquid and tend to collapse into a dense material upon drying. Certain methods have proven effective for making a dry porous material from cellulose nanofibrils, but these are often expens

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Josefsson, Gabriella. "Elasticity of Cellulose Nanofibril Materials." Doctoral thesis, Uppsala universitet, Tillämpad mekanik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-240250.

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The demand for renewable load-carrying materials is increasing with increasing environmental awareness. Alternative sources for materials manufacturing and design have to be investigated in order to replace the non-biodegradable materials. The work presented in this thesis investigates structure-property relations of such renewable materials based on cellulose nanofibrils. Cellulose is the most abundant polymer on earth and exists in both ordered and disordered phases, where the ordered crystalline cellulose shows excellent mechanical properties. The celluloses nanofibril is composed of partly

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15

Yao, Jian. "High strength and high modulus electrospun nanofibres." Thesis, Queen Mary, University of London, 2014. http://qmro.qmul.ac.uk/xmlui/handle/123456789/9120.

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In the last two decades, a rapidly growing polymer processing technology, electrospinning, has attracted great interests as it provides a viable and simple method to create ultra-fine continuous fibres. Despite the potential utilization of electrospun nanofibres in many fields, their success is limited so far due to their poor mechanical properties compared to corresponding textile fibres made from the same polymers, which is mainly ascribed to the low degree of orientation and chain extension of the macromolecules along the fibre axis in such fibres. In this thesis, first an in-depth review o

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16

Dunnill, Charles. "Synthesis, characterisation and properties of tantalum based inorganic nanofibres." Connect to e-thesis, 2007. http://theses.gla.ac.uk/173/.

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Thesis (Ph.D.) - University of Glasgow, 2007.<br>Ph.D. thesis submitted to the Department of Chemistry, Faculty of Physical Sciences, University of Glasgow, 2007. Includes bibliographical references. Print version also available.

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17

Wang, Qijue. "Nanofibrils As The Basic Building Blocks Of Spider Silk." W&M ScholarWorks, 2020. https://scholarworks.wm.edu/etd/1593092048.

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Spider silk is a natural high-performance biopolymer with superior mechanical properties, resulting from its hierarchical structure. With protein nanofibrils observed in various spider and silkworm silks, the critical role of nanofibrils in achieving the silk's mechanical behavior has been widely suggested by both experimental observations and numerical simulations. However, a close review of available evidence of silk nanofibrils reveals many crucial aspects are still largely ambiguous or unknown. This further hinders the development of advanced silk-based materials. The simple structure of t

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18

Bittencourt, Jéssyka Carolina. "Fabricação e caracterização de nanofibras condutoras de Poli(álcool vinílico) com Polianilina (PVA/PANI) para a utilização em sensores de gás amônia /." Presidente Prudente, 2017. http://hdl.handle.net/11449/151348.

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Orientador: Clarissa de Almeida Olivati<br>Banca: Valdemiro Pereira de Carvalho Junior<br>Banca: Edson Laureto<br>Resumo: Neste trabalho, nanofibras de Poli(álcool vinílico) com PVA foram produzidas, variando os parâmetros de eletrofiação: concentração de PVA, rotação e distância do coletor. Após o estudo dos parâmetros de eletrofiação, foram produzidas nanofibras através da adição do polímero condutor, polianilina, PANI, em diferentes concentrações, na matriz isolante de PVA. As nanofibras foram caracterizadas morfologicamente através da técnica de Microscopia eletrônica de Varredura, no qual

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19

Casadei, Lorenzo. "Sviluppo di un sistema di caratterizzazione elettroacustica per materiali piezoelettrici nanofibrosi." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Nell'elaborato di tesi vengono descritti il processo per la realizzazione di membrane piezoelettriche nanofibrose e lo sviluppo di un sistema di caratterizzazione elettroacustica per materiali piezoelettrici nanofibrosi. Viene successivamente trattata la caratterizzazione delle membrane prodotte utilizzando prima una sorgente vibrazionale sinusoidale e successivamente una sorgente vibrazionale impulsiva.

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Zhang, Zhifei. "Polytetrafluoroethylene nanofibres fabricated by the island-in-the-sea method." Thesis, Queen Mary, University of London, 2017. http://qmro.qmul.ac.uk/xmlui/handle/123456789/25989.

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Polytetrafluoroethylene (PTFE) has some unique properties such as high hydrophobicity and high resistance to elevated temperatures, chemicals and solvents, which make it of interest for numerous fibre and textile applications. However, PTFE normally has a very high viscosity and poor flowability in the melt due to its ultra-high molecular weight, meaning that it cannot be readily melt-spun into textile fibres. In addition, PTFE is insoluble in all common organic solvents, prohibiting its use in common solution spinning methods such as dry, wet or electrospinning. Here we aim to develop an easy

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Nazir, Ahsan. "Modelling and optimization of electrospun materials for technical applications." Thesis, Mulhouse, 2016. http://www.theses.fr/2016MULH0598/document.

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Ce travail de recherche traite de l’optimisation et de la modélisation de nanofibres obtenues par filage électrostatique pour des applications techniques en tant que, a) cellules résistives pour génération de chaleur et b) couche ultra filtrante pour système de protection respiratoire. Afin d’intégrer ces matériaux nanofibreux aux applications visées, deux procédés de production ont été mis en oeuvre, à savoir mono-aiguille et multijets. Une étude statistique a été réalisée pour modéliser et optimiser les non-tissés de nanofibres pour des productions à échelle laboratoire et semi-industrielle.

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Keulder, Liesl. "The preparation of polyolefin nanofibres by solution electrospinning." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80277.

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Thesis (PhD)--Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: Solution electrospinning is a technique used to produce polymer micro- or nanofibres. Recently a great deal of research has been done on the application of polymer nanofibres produced by this method. The solution electrospinning of polyolefins have not been researched in-depth mainly due to the difficulty in dissolving these polymers in suitable electrospinning solvents. We managed to electrospin polypropylene copolymers at room temperature, obtaining both polymer micro- and nanofibres. A suitable solvent system was developed (

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Rempel, Silvana Pereira. "Obtenção de micro/nanofibras poliméricas por fiação por sopro : parâmetros e aplicação no controle de pragas agrícolas." reponame:Repositório Institucional da UCS, 2018. https://repositorio.ucs.br/11338/3937.

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Este trabalho apresenta a obtenção de micro/nanofibras de EVA utilizando o método de fiação por sopro em solução e sua possibilidade de aplicação na agricultura, no controle de pragas, através da incorporação de feromônios sexuais sintéticos. Soluções com concentração de 0,5−15% em massa de EVA em xileno: clorofórmio (96:4% em peso) foram preparadas com base no parâmetro de solubilidade do copolímero. A viscosidade das soluções, assim como o regime de concentração foi determinado por meio de medidas reológicas. A morfologia e estrutura das fibras foram avaliadas por meio de microscopia eletrôn

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Terrones-Maldonado, Mauricio. "Production and characterisation of novel fullerene-related materials : nanotubes, nanofibres and giant fullerenes." Thesis, University of Sussex, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361404.

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Pottathara, Yasir Beeran. "Graphene based Composites with Cellulose Nanofibrils for Energy storage applications." Thesis, Lorient, 2017. http://www.theses.fr/2017LORIS450/document.

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La recherche sur les matériaux diélectriques souples et biodégradable a été augmenté considérablement en raison de l'augmentation des exigences concernant l'énergie et les questions environnementales. Les composites polymériques, avec constante diélectrique élevée ont ainsi, été préférés par rapport aux composites à base de céramique pour les périphériques de stockage de l'énergie. L'objectif de cette thèse est de fabriquer une électrode biodégradable matériaux à base de nano-fibrilles de cellulose natives et oxydés (CNF) et de graphène pour améliorer le stockage diélectrique ainsi que les app

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Muller, Daliana. "Incorporação de polímeros intrinsecamente condutores em nanofibras de celulose bacteriana." Florianópolis, 2012. http://repositorio.ufsc.br/xmlui/handle/123456789/99476.

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Tese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Ciência e Engenharia de Materiais<br>Made available in DSpace on 2013-03-04T20:47:41Z (GMT). No. of bitstreams: 1 304106.pdf: 4098740 bytes, checksum: 4900c3d95de1e41dfd987f663838d1b5 (MD5)<br>Nesta tese foi estudada a incorporação de polímeros condutores como polipirrol (PPy), polianilina (PAni) e poli(3,4 etileno dioxi tiofeno) (PEDOT) em membranas de celulose bacteriana (CB) a partir do processo de polimerização oxidativa in situ do pirrol (Py), anilina (Ani) ou 3,4 etileno dioxitiofe

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Ractz, Guilherme Segatt. "Síntese de nanofibras de polianilina e preparação do nanocompósito de polipropileno / polianilina." Pontifícia Universidade Católica do Rio Grande do Sul, 2012. http://hdl.handle.net/10923/7422.

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Made available in DSpace on 2015-06-25T02:05:26Z (GMT). No. of bitstreams: 1 000471013-Texto+Completo-0.pdf: 1943495 bytes, checksum: 36e051cefa7a9d47d6a0d608dff24d67 (MD5) Previous issue date: 2012<br>The following paper reports the synthesis of polyaniline (PANI) nanofibers and the making of nanocomposites that have polypropylene as their polymer matrix. Polyaniline nanofibers have been synthesized by the quick-mix method. Hydrochloridric and sulfuric acids were evaluated as dopant agents in different reaction temperatures: 25, 60 and 100 °C. Polypropylene (PP) nanocomposites were prepared

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Valente, Cristhiane Alvim. "Síntese de nanofibras de polipirrol para potencial aplicação em conduto biodegradável para regeneração nervosa." Pontifícia Universidade Católica do Rio Grande do Sul, 2014. http://hdl.handle.net/10923/6856.

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Made available in DSpace on 2014-10-15T02:01:02Z (GMT). No. of bitstreams: 1 000462029-Texto+Completo-0.pdf: 6506501 bytes, checksum: ac4fdb8832287abddfd8e14f596d52a1 (MD5) Previous issue date: 2014<br>Injury of peripheral nerves of accidents at work or home are common carriers and scallfolds of biodegradable polymers with temporary structural function to assist in the regeneration of damaged living tissue are being explored. Conducting polymers such as polypyrrole (PPy), have also been explored because of biocompatibility to various cell types and ease of synthesis. Artificial Nerve Guidanc

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Oliveira, Juliana Bovi de. "Obtenção de Nanofibras de Carbono a partir do Processo de Eletrofiação /." Guaratinguetá, 2016. http://hdl.handle.net/11449/138173.

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Orientador: Edson Cocchieri Botelho<br>Coorientadora: Lília Müller Guerrini<br>Banca: Mirabel Cerqueira Rezende<br>Banca: Silvia Sizuka Oishi<br>Resumo: Nos últimos anos, reforços constituídos de nanoestruturas em carbono, tais como nanotubos de carbono, fulerenos, grafenos e nanofibras de carbono, vêm sendo muito pesquisados devido às suas elevadas propriedades mecânicas, elétricas e térmicas. Uma vez que, as nanofibras de carbono consistem em um reforço contínuo (ou na forma de mantas) de elevada área superficial específica, associado ao fato de que estas podem ser obtidas a um baixo custo e

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Zhu, Jian [Verfasser], and Seema [Akademischer Betreuer] Agarwal. "High-performance Electrospun Polymer Nanofibres and Their Composite Materials with Hectorite / Jian Zhu ; Betreuer: Seema Agarwal." Bayreuth : Universität Bayreuth, 2019. http://d-nb.info/1196201730/34.

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Graebin, Ana Paula. "Síntese de compósitos baseados em polietileno/nanofibras de polianilina e grafite." Pontifícia Universidade Católica do Rio Grande do Sul, 2015. http://hdl.handle.net/10923/7406.

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Made available in DSpace on 2015-06-20T02:07:24Z (GMT). No. of bitstreams: 1 000470698-Texto+Completo-0.pdf: 3211899 bytes, checksum: 304adc552bbe30591d967a6721608b0c (MD5) Previous issue date: 2015<br>The research work is related to the preparation of polymer composites based on polyaniline (PAni) and graphite. Polyaniline nanofibers were synthesized by the method of rapid mixing. Hybrid load (PAni/NLG) was synthesized by polymerizing aniline in the presence of graphite nanosheets (NLG). Polymer composites were prepared using differents methodologies: melt blending and in situ polymerizatio

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Maccaferri, Emanuele. "Studio di membrane nanofibrose ottenute da elettrofilatura di poliarammidi per il rinforzo di materiali compositi." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10069/.

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Uno tra i principali problemi dei compositi è il fenomeno della delaminazione. In questo lavoro di tesi sono state prodotte membrane nanofibrose ottenute mediante elettrofilatura di poliarammidi, da impiegare come rinforzo per contrastare tale fenomeno. Sono state quindi preparate soluzioni di Nomex con differenti combinazioni di concentrazione e solvente da sottoporre ad elettrofilatura, e sono stati ricercati i parametri di processo ottimali. La qualità delle nanofibre è stata valutata attraverso analisi SEM e successivamente sono state determinate le proprietà termo-meccaniche delle membran

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Anún, Joaquin, and Fabio Josè Bagatello. "Diseño e implementación de un equipo de electrohilado para la obtención de nanofibras de hidroxiapatita en gelatina." Bachelor's thesis, Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales, 2017. http://hdl.handle.net/11086/6537.

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Proyecto Integrador (I.Biom.)--FCEFN-UNC, 2017<br>Busca describir el proceso de diseño, fabricación e implementación de un equipo para la producción de nanofibras de gelatina e hidroxiapatita, a partir de una técnica denominada electrohilado o electrospinning

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Oliveira, Felipo de. "Síntese de nanocompósitos de nanofibras de polianilina e polietileno por meio da polimerização “IN SITU”." Pontifícia Universidade Católica do Rio Grande do Sul, 2011. http://hdl.handle.net/10923/3334.

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Made available in DSpace on 2013-08-07T18:54:45Z (GMT). No. of bitstreams: 1 000434521-Texto+Completo-0.pdf: 3294968 bytes, checksum: fbcc929bfb1cb1c681e58d0bf2918d23 (MD5) Previous issue date: 2011<br>This work is related to the synthesis of polyaniline nanofibers, a conducting polymer with high electrical conductivity. Nanocomposites with polyaniline nanofibers as filler and polyethylene as the polymer matrix were prepared. The polyaniline nanofibers with average diameters of 80 nm were obtained by interfacial polymerization approach and the nanofibers were characterized by scanning electr

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Alves, Annelise Kopp. "Obtenção de micro e nanofibras de TiO2 por electrospinning : caracterização de propriedades e atividade fotocatalítica." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2008. http://hdl.handle.net/10183/13513.

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Este trabalho versou sobre a obtenção de micro e nanofibras de óxido de titânio pela técnica de electrospinning de uma solução polimérica. A obtenção do sistema sol-gel, precursor de óxidos e aditivos, foi baseada na hidrólise e condensação de sais, como propóxido de titânio, cloreto de zircônio e nitrato de cério. Foram investigadas soluções poliméricas de PVA, PVB, PVP e POE, em diferentes concentrações, 5, 10, 15 e 20%, em meio aquoso, ou alcoólico. Esses sistemas foram caracterizados quanto a sua viscosidade e condutividade iônica. Após um período de 24h de repouso, as soluções poliméricas

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Fall, Andreas. "Cellulose nanofibril materials with controlled structure : the influence of colloidal interactions." Licentiate thesis, KTH, Fiberteknologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-49159.

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Nanoparticles are very interesting components. Due to their very large specific surface area they possess properties in between molecules and macroscopic materials. In addition, a material built up of hierarchically assembled nanoparticles could obtain unique properties, not possessed by the nanoparticles themself. A very interesting group of nanoparticles is the cellulose nanofibrils. The fibrils are found in various renewable resources such as wood, bacteria and tunicates. In this work fibrils extracted from wood is studied. In wood the fibrils are the smallest fibrous component with the app

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Vincent, Cécile. "Le composite cuivre / nanofibres de carbone." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2008. http://tel.archives-ouvertes.fr/tel-00377607.

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Le matériau composite Cu/NFC (Nano Fibre de Carbone) peut être utilisé en tant que drain thermique par les industriels de l'électronique de puissance. En remplacement du cuivre, il doit combiner une conductivité thermique élevée et un coefficient de dilatation thermique adapté à celui de la céramique du circuit imprimé (alumine ou nitrure d'aluminium). Après avoir étudié les propriétés de la matrice cuivre et des NFC, plusieurs méthodes de synthèse du composite Cu/NFC ont été développées. Le composite a tout d'abord été élaboré par métallurgie des poudres. Puis, dans le but d'améliorer l'homog

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Ractz, Guilherme Segatt. "S?ntese de nanofibras de polianilina e prepara??o do nanocomp?sito de polipropileno / polianilina." Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2012. http://tede2.pucrs.br/tede2/handle/tede/6171.

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Submitted by Setor de Tratamento da Informa??o - BC/PUCRS (tede2@pucrs.br) on 2015-06-24T21:45:32Z No. of bitstreams: 1 471013 - Texto Completo.pdf: 1943495 bytes, checksum: 36e051cefa7a9d47d6a0d608dff24d67 (MD5)<br>Made available in DSpace on 2015-06-24T21:45:32Z (GMT). No. of bitstreams: 1 471013 - Texto Completo.pdf: 1943495 bytes, checksum: 36e051cefa7a9d47d6a0d608dff24d67 (MD5) Previous issue date: 2012-07-16<br>The following paper reports the synthesis of polyaniline (PANI) nanofibers and the making of nanocomposites that have polypropylene as their polymer matrix. Polyaniline nanofibe

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Schifino, Gioacchino. "Elettrofilatura di miscele di cheratina e PLA caricate con ossido di grafene per la produzione di materiali nanofibrosi." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19189/.

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In questo elaborato di tesi sperimentale sono state preparate delle nanofibre elettrofilate di cheratina e PLA caricate con differenti percentuali in peso di grafene ossido. In questo particolare sistema, la dimensione del nano-rinforzo è paragonabile alla dimensione delle nanofibre (circa 150 nm), contrariamente alle convenzionali dimensioni dei rinforzi utilizzati per creare materiali compositi. La matrice polimerica utilizzata è una miscela costituita da cheratina e PLA che ha mostrato interazioni positive di interfase tra i due polimeri. Sono stati studiati gli effetti dei parametri di p

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Godoy, Vitor Alexandre Garcia. "Processamento de nanofibras de poliamida 66 / nanotubos de carbono de múltiplas camadas por eletrofiação." Universidade Federal de São Carlos, 2010. https://repositorio.ufscar.br/handle/ufscar/866.

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Made available in DSpace on 2016-06-02T19:12:20Z (GMT). No. of bitstreams: 1 4465.pdf: 10774781 bytes, checksum: 2e442c2a3e4dd9681006bcb583a7c8af (MD5) Previous issue date: 2010-03-26<br>Financiadora de Estudos e Projetos<br>Nanocomposite fibers with polymer matrix have many applications, such as protective clothing, filtration and artificial blood vessels. Many of these applications require that the fiber has nanometric size due to some properties, as high surface area and high aspect ratio. In this research, aligned and non-aligned nanocomposites of polyamide 6,6 with multiwalled carbon na

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Silva, Bárbara Estefânia de Almeida. "Tratamento a plasma de nanofibrilas de celulose para aplicação em compósitos." Universidade Federal de São Carlos, 2017. https://repositorio.ufscar.br/handle/ufscar/9160.

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Submitted by Milena Rubi ( ri.bso@ufscar.br) on 2017-10-17T16:37:26Z No. of bitstreams: 1 SILVA_Barbara_2017.pdf: 2018251 bytes, checksum: 6dab58bc6d22c81d23f1cfb7011353bf (MD5)<br>Approved for entry into archive by Milena Rubi ( ri.bso@ufscar.br) on 2017-10-17T16:37:37Z (GMT) No. of bitstreams: 1 SILVA_Barbara_2017.pdf: 2018251 bytes, checksum: 6dab58bc6d22c81d23f1cfb7011353bf (MD5)<br>Approved for entry into archive by Milena Rubi ( ri.bso@ufscar.br) on 2017-10-17T16:37:47Z (GMT) No. of bitstreams: 1 SILVA_Barbara_2017.pdf: 2018251 bytes, checksum: 6dab58bc6d22c81d23f1cfb7011353bf (MD5)<

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Moreira, Francys Kley Vieira. "Desenvolvimento de nanocompósitos poliméricos biodegradáveis a partir de pectina, amido e nanofibras de celulose." Universidade Federal de São Carlos, 2010. https://repositorio.ufscar.br/handle/ufscar/817.

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Made available in DSpace on 2016-06-02T19:12:05Z (GMT). No. of bitstreams: 1 3298.pdf: 5267625 bytes, checksum: c21d0a6b7606b0e18816dca04d889675 (MD5) Previous issue date: 2010-09-16<br>Universidade Federal de Sao Carlos<br>The objective of this project was the preparation of biodegradable films from polymer blends of citrus pectin (PEC) and thermoplastic starch (TPS) and the modification of its mechanical properties by formation of nanocomposites with cellulose nanofibers (NCel). The project was conducted in three stages. Firstly, the nanofibers were obtained from bleached sugarcane bagasse

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Graebin, Ana Paula. "S?ntese de comp?sitos baseados em polietileno/nanofibras de polianilina e grafite." Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2015. http://tede2.pucrs.br/tede2/handle/tede/6152.

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Submitted by Setor de Tratamento da Informa??o - BC/PUCRS (tede2@pucrs.br) on 2015-06-19T11:25:03Z No. of bitstreams: 1 470698 - Texto Completo.pdf: 3211899 bytes, checksum: 304adc552bbe30591d967a6721608b0c (MD5)<br>Made available in DSpace on 2015-06-19T11:25:03Z (GMT). No. of bitstreams: 1 470698 - Texto Completo.pdf: 3211899 bytes, checksum: 304adc552bbe30591d967a6721608b0c (MD5) Previous issue date: 2015-03-23<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES<br>The research work is related to the preparation of polymer composites based on polyaniline (PAni) and grap

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Oliveira, Marco Aurélio Vinchi. "Desenvolvimento de um sistema de rotofiação para obtenção e investigação da formação de matrizes nanofibrosas poliméricas." reponame:Repositório Institucional da UFABC, 2017.

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Ferrand, Alice. "Développement de biomatériaux nanofibreux/microporeux actifs pour la régénération osseuse." Thesis, Strasbourg, 2012. http://www.theses.fr/2012STRAE030.

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Les nanotechnologies sont en train de révolutionner le domaine biomédical et plus particulièrement l’ingénierie tissulaire. Elles permettent aujourd’hui, non seulement de réparer mais aussi de régénérer les tissus. Cette nanomédecine régénérative est particulièrement adaptée pour répondre aux besoins importants liés aux maladies dégénératives, au vieillissement et aux traumatismes.Mon travail de thèse s’inscrit dans ce contexte et concerne l’élaboration de biomatériaux nanofibreux et microporeux actifs pour la régénération osseuse. Notre objectif essentiel est de réaliser un implant biodégrada

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D'Anniballe, Riccardo. "Sviluppo e caratterizzazione elettromeccanica di un sensore piezoelettrico nanofibroso per applicazioni in laminati compositi." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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Nell’elaborato di tesi magistrale, dal titolo “Sviluppo e caratterizzazione elettromeccanica di un sensore piezoelettrico nanofibroso per applicazioni in laminati compositi”, si è studiata la possibilità di produrre un laminato composito sensorizzato con finalità di Structural Health Monitoring (SHM). Lo studio si è concentrato sui materiali piezoelettrici che risultano particolarmente adatti per finalità di sensing in quanto rispondono ad uno stimolo meccanico con una variazione nel livello di polarizzazione elettrica. Nel lavoro di tesi è descritto il processo produttivo in tutte le sue fasi

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Valente, Cristhiane Alvim. "S?ntese de nanofibras de polipirrol para potencial aplica??o em conduto biodegrad?vel para regenera??o nervosa." Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2014. http://tede2.pucrs.br/tede2/handle/tede/3268.

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Made available in DSpace on 2015-04-14T13:59:10Z (GMT). No. of bitstreams: 1 462029.pdf: 6506501 bytes, checksum: ac4fdb8832287abddfd8e14f596d52a1 (MD5) Previous issue date: 2014-03-28<br>Injury of peripheral nerves of accidents at work or home are common carriers and scallfolds of biodegradable polymers with temporary structural function to assist in the regeneration of damaged living tissue are being explored. Conducting polymers such as polypyrrole (PPy), have also been explored because of biocompatibility to various cell types and ease of synthesis. Artificial Nerve Guidance Conduits wit

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Liu, Erming. "Synthesis of one-dimensional nanocomposites based on alumina nanofibres and their catalytic applications." Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/48323/1/Erming_Liu_Thesis.pdf.

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Materials with one-dimensional (1D) nanostructure are important for catalysis. They are the preferred building blocks for catalytic nanoarchitecture, and can be used to fabricate designer catalysts. In this thesis, one such material, alumina nanofibre, was used as a precursor to prepare a range of nanocomposite catalysts. Utilising the specific properties of alumina nanofibres, a novel approach was developed to prepare macro-mesoporous nanocomposites, which consist of a stacked, fibrous nanocomposite with a core-shell structure. Two kinds of fibrous ZrO2/Al2O3 and TiO2/Al2O3 nanocomposites wer

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Silva, Pierre Weinmann da. "Obtenção de blendas poliméricas de polipropileno contendo como carga condutiva um nanocompósito formado por nanofibras de polianilina e nanolâminas de grafite." Pontifícia Universidade Católica do Rio Grande do Sul, 2012. http://hdl.handle.net/10923/7441.

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Made available in DSpace on 2015-06-30T02:06:17Z (GMT). No. of bitstreams: 1 000471334-Texto+Completo-0.pdf: 4524191 bytes, checksum: f5450152427bd38ead2e27ad8d28c46b (MD5) Previous issue date: 2012<br>This work aims to obtain polymer blends containing polypropylene wtih conductive nanofibers formed by polyaniline and graphite nanosheets. Will study the effects of morphology and the electrical and mechanical properties of the resulting polymer. The polyaniline nanofibers are synthesized in the presence of graphite nanosheets using the methodology of rapid mixing. The preparation of blends of

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Wei, Jiayuan. "Preparation and characterization of nanocellulose-based carbon dioxide adsorbing aerogels." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-66166.

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CO2 adsorption is considered as a promising strategy to decrease the amount of CO2 in the atmosphere and stop global warming. The goal of this project is to prepare a cellulose-based CO2 adsorbent with a good mass transfer. Monolithic adsorbent based on cellulose nanofibrils (CNF) was fabricated via freeze-casting. 0.1g or 0.5g cellulose acetate (CA) or 0.1g acetylated CNC (aCNC) was dipped into the crosslinked aerogel to increase its CO2 capacity. Acetylation of CNC was confirmed by Fourier transformed infrared spectroscopy (FT-IR) and the degree of substitution was determined to be 1.6 throu

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