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Littérature scientifique sur le sujet « Carbon microfibrils »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 31 juillet 2025

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Articles de revues sur le sujet "Carbon microfibrils"

Thomas, Lynne, and Michael Jarvis. "Unravelling the nanostructure of cellulose microfibrils." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C1321. http://dx.doi.org/10.1107/s2053273314086781.

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Cellulose is the most abundant naturally occurring polymer and has diverse applications in biology, energy and engineering. The cellulose nanostructure has implications on the mechanical strength of natural materials such as wood and nanocelluloses are also being used to create high-performance composite materials with properties comparable to aramid fibres and carbon nanotubes. The efficiency of breakdown of cellulose into ethanoic alcohols for biofuels is also strongly linked to the aggregation of cellulose fibres into microfibrils. Despite this, the nanostructure of cellulose microfibrils i

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Festucci-Buselli, Reginaldo A., Wagner C. Otoni, and Chandrashekhar P. Joshi. "Structure, organization, and functions of cellulose synthase complexes in higher plants." Brazilian Journal of Plant Physiology 19, no. 1 (2007): 1–13. http://dx.doi.org/10.1590/s1677-04202007000100001.

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Annually, plants produce about 180 billion tons of cellulose making it the largest reservoir of organic carbon on Earth. Cellulose is a linear homopolymer of beta(1-4)-linked glucose residues. The coordinated synthesis of glucose chains is orchestrated by specific plasma membrane-bound cellulose synthase complexes (CelS). The CelS is postulated to be composed of approximately 36 cellulose synthase (CESA) subunits. The CelS synthesizes 36 glucose chains in close proximity before they are further organized into microfibrils that are further associated with other cell wall polymers. The 36 glucos

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LIN, R. J. T., D. BHATTACHARYYA, and S. FAKIROV. "INNOVATIVE MANUFACTURING OF CARBON NANOTUBE-LOADED FIBRILLAR POLYMER COMPOSITES." International Journal of Modern Physics B 24, no. 15n16 (2010): 2459–65. http://dx.doi.org/10.1142/s021797921006509x.

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The concept of microfibrillar composite (MFC) has been used to create a new type of polymer composites, in which the reinforcing microfibrils are loaded with carbon nanotubes (CNT). Polyamide 66 (PA66) has been melt blended with polypropylene in a twin screw extruder with and without CNT, and thereafter cold drawn to create a fibrillar state as well as to align the CNT in the PA66 microfibrils. The drawn bristles were compression moulded at 180°C to prepare MFC plates. The scanning electron microscope (SEM) observations indicate near perfect distribution of CNT in the reinforcing PA66 microfib

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Wang, Yu, Song Liu, Huihao Zhu, et al. "The Entangled Conductive Structure of CB/PA6/PP MFCs and Their Electromechanical Properties." Polymers 13, no. 6 (2021): 961. http://dx.doi.org/10.3390/polym13060961.

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In this work, carbon black (CB)/polyamide 6 (PA6)/polypropylene (PP) microfibrillar composites (MFCs) were fabricated through an extrusion (hot stretching) heat treatment process. The CB-coated conductive PA6 microfibrils with high aspect ratio were in situ generated as a result of the selective accumulation of CB at the interface. At the proper temperature, a 3D entangled conductive structure was constructed in the PP matrix, due to topological entanglement between these conductive microfibrils. This unique conductive structure provided the PP composites with a low electrical conductivity per

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Zheng, Yunzhen, Daniel J. Cosgrove, and Gang Ning. "High-Resolution Field Emission Scanning Electron Microscopy (FESEM) Imaging of Cellulose Microfibril Organization in Plant Primary Cell Walls." Microscopy and Microanalysis 23, no. 5 (2017): 1048–54. http://dx.doi.org/10.1017/s143192761701251x.

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AbstractWe have used field emission scanning electron microscopy (FESEM) to study the high-resolution organization of cellulose microfibrils in onion epidermal cell walls. We frequently found that conventional “rule of thumb” conditions for imaging of biological samples did not yield high-resolution images of cellulose organization and often resulted in artifacts or distortions of cell wall structure. Here we detail our method of one-step fixation and dehydration with 100% ethanol, followed by critical point drying, ultrathin iridium (Ir) sputter coating (3 s), and FESEM imaging at a moderate

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Sun, Hui, Haijuan Kong, Haiquan Ding, et al. "Improving UV Resistance of Aramid Fibers by Simultaneously Synthesizing TiO2 on Their Surfaces and in the Interfaces Between Fibrils/Microfibrils Using Supercritical Carbon Dioxide." Polymers 12, no. 1 (2020): 147. http://dx.doi.org/10.3390/polym12010147.

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Aramid fibers with low density and high strength, modulus, and thermal resistance are widely used in applications such as bulletproof vests and cables. However, owing to their chemical structure, they are sensitive to ultraviolet light, which degrades the fibers’ useful mechanical properties. In this study, titanium dioxide (TiO2) nanoparticles were synthesized both on the aramid III fiber surface and in the interfacial space between the fibrils/microfibrils in supercritical carbon dioxide (scCO2) to improve the UV resistance of aramid fibers. The effects of scCO2 treatment pressure on the TiO

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Chen, Qian-ying, Jing Gao, Kun Dai, et al. "Nonlinear current-voltage characteristics of conductive polyethylene composites with carbon black filled pet microfibrils." Chinese Journal of Polymer Science 31, no. 2 (2012): 211–17. http://dx.doi.org/10.1007/s10118-013-1203-1.

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Bolgova, A. L., A. A. Shevtsov, N. A. Arkharova, et al. "MICROSTRUCTURE OF GEL FILMS OF BACTERIAL CELLULOSE SYNTHESIZED UNDER STATIC CONDITIONS OF CULTIVATION OF THE GLUCONACETOBACTER HANSENII GH-1/2008 STRAIN ON NUTRIENT MEDIA WITH DIFFERENT CARBON SOURCES." Кристаллография 68, no. 4 (2023): 607–14. http://dx.doi.org/10.31857/s002347612370025x.

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The study presents a comparative analysis of the structures of dried films of bacterial cellulose (BC) produced by bacteria of the Gluconacetobacter hansenii GH-1/2008 strain under static conditions of cultivation on nutrient media with different carbon sources, such as glucose, sucrose, maltose, fructose, and lactose. It was found that the supramolecular structure of the films is a three-dimensional network composed of orientationally ordered microfibrils with an average diameter from 30 to 60 nm, which consist of crystalline and amorphous regions. An analysis of the powder X-ray diffraction

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Carvelli, Valter, Toru Fujii, and Kazuya Okubo. "The effect of microfibrils cellulose modified epoxy on the quasi-static and fatigue behaviour of open hole carbon textile composites." Journal of Composite Materials 52, no. 24 (2018): 3365–80. http://dx.doi.org/10.1177/0021998318765623.

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The extensive experimental investigation aimed to assess the effects of hybrid epoxy resin with micro-fibrillated cellulose on tensile quasi-static and fatigue behaviour of open hole carbon plain weave composites. The hybridization of the matrix allowed an improved damage tolerance of the composite leading to increase of the quasi-static tensile strength and extension of the fatigue life. The enhanced mechanical performance of the notched composites was connected to the bridging effect of cellulose microfibrils preventing or delaying the cracks propagation in the matrix and along the fibres in

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Ruben, George C., and Gordon H. Bokelman. "Freeze-dried and platinum-carbon replicated 35Å cellulose microfibrils are triple-stranded and left-hand twisted." Proceedings, annual meeting, Electron Microscopy Society of America 44 (August 1986): 58–61. http://dx.doi.org/10.1017/s0424820100142013.

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To contrast enhance unidirectional (45° angle) 15-18Å thick Pt/C coated cellulose specimens backed with 100-173Å thick carbon films, micrographs were contrast reversed on Kodak 7302 fine grain positive film. In addition to increasing the contrast of 10-20Å features, the Pt/C coated surfaces are now white and the molecular details are modulated on this background in blacks and shades of grey for easy structural interpretation. By shooting a tilt series at 10° intervals at 105X on a JEM 100CX at 80KV with a 5mm focal length and a 40μ objective aperture, a 6.6Å resolution and a 2710Å depth of fie

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Thèses sur le sujet "Carbon microfibrils"

DISTEFANO, GAETANO. "Nanoporous dipeptide crystals as selective gas sorbents and polymerization nanovessels." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2012. http://hdl.handle.net/10281/29103.

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Hydrophobic dipeptide crystals recently emerged as novel “organic zeolites” featuring tailorable pore size. In fact, seven out of nine pairwise combinations of L-isoleucine, L-valine and L-alanine amino acids crystallize according to the same charge-assisted hydrogen bond pattern, generating a family of microporous materials with right-handed 1D channels, having diameters in the sub-nanometer domain (<6Å), aliphatic environment and different degrees of helicity. The relationship between pore size and material properties was investigated with respect to gas separation, exploiting the affinity o

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Prado, Giovana Gabriel. "Projeto e caracterização de membranas cerâmicas utilizando microfibras como precursoras de porosidade." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/18/18146/tde-25052015-091114/.

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Este trabalho trata do estudo da introdução de fibras poliméricas como agente porogênico na manufatura de membranas cerâmicas de alta resistência mecânica. Membranas cerâmicas são utilizadas para a separação de substâncias onde a estabilidade química e a resistência à alta temperatura são requeridas; na engenharia mecânica é também aplicada como mancais aerostáticos. A escolha do processo de manufatura destas membranas e o projeto da porosidade da estrutura cerâmica é de grande importância. Quando se utiliza da adição de elementos porogênicos, que são substâncias que se decompõem durante a que

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Karanjikar, Mukund R. Tatarchuk Bruce J. "Low temperature oxidation of carbon monoxide using microfibrous entrapped catalysts for fire escape mask application." Auburn, Ala., 2005. http://hdl.handle.net/10415/1276.

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Sathitsuksanoh, Noppadon Tatarchuk Bruce J. "Sequestration of CO₂ by chemically reactive aqueous K₂CO₃ in high efficiency adsorbents using microfibrous media entrapped support particulates." Auburn, Ala., 2007. http://repo.lib.auburn.edu/2006%20Fall/Theses/SATHITSUKSANOH_NOPPADON_5.pdf.

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Oliveira, Juliana Bovi de. "Obtenção e caracterização de compósitos de epóxi/microfibras elastoméricas/fibras de carbono para aplicações aeronáuticas /." Guaratinguetá, 2020. http://hdl.handle.net/11449/192431.

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Orientador: Edson Cocchieri Botelho Resumo: Esta pesquisa visa o processamento de compósitos termorrígidos laminados multifuncionais, via moldagem por compressão a quente, constituídos por fibras de carbono, resina epóxi e mantas de poli(butadieno) (BR) produzidas via processo de eletrofiação. Estas mantas têm como função proporcionar maior tenacidade ao compósito obtido, aumentando sua tolerância ao dano e consequentemente, elevando sua aplicabilidade no setor aeroespacial. Para o desenvolvimento deste trabalho de pesquisa, primeiramente, foram produzidas mantas de poli(butadieno) por elet

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Rosenberger, Andressa Giombelli. "Eletrofiação no preparo de sensor eletroquímico a base de nanotubos de carbono." Universidade Estadual do Oeste do Paraná, 2017. http://tede.unioeste.br/handle/tede/3098.

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Submitted by Marilene Donadel (marilene.donadel@unioeste.br) on 2017-09-29T01:08:32Z No. of bitstreams: 1 Andressa_G_Rosenberger_2017.pdf: 2187152 bytes, checksum: eeb5c275b57d9c489c86178a66925400 (MD5) Made available in DSpace on 2017-09-29T01:08:32Z (GMT). No. of bitstreams: 1 Andressa_G_Rosenberger_2017.pdf: 2187152 bytes, checksum: eeb5c275b57d9c489c86178a66925400 (MD5) Previous issue date: 2017-03-01 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES Fundação Araucária de Apoio ao Desenvolvimento Científico e Tecnológico do Estado do Paraná (FA) Water is

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Segura, Alcaraz María del Pilar. "Empleo de textiles en aplicaciones de absorción sonora." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/159786.

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[ES] Esta memoria de tesis presenta una contribución al estudio de los materiales textiles en el campo de la absorción sonora. En concreto, se ha trabajado con la asociación de una capa absorbente fibrosa constituida por una estructura laminar no tejida cuya composición es poliéster y una capa resistiva a base de tejido de calada también compuesta de poliéster. El objetivo de este trabajo consiste en evaluar las variaciones que provocan los cambios en distintos parámetros de construcción de la capa resistiva, sobre el comportamiento del conjunto ante el sonido. Para abordar el problema se empl

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Livres sur le sujet "Carbon microfibrils"

E, Kretschmann David, and Forest Products Laboratory (U.S.), eds. Long-term effects of elevated carbon dioxide concentration on sour orange wood specific gravity, modulus of elasticity, and microfibril angle. U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 2007.

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Long-term effects of elevated carbon dioxide concentration on sour orange wood specific gravity, modulus of elasticity, and microfibril angle. U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 2007.

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Actes de conférences sur le sujet "Carbon microfibrils"

Vazquez, Analía, Teresa M. Piqué, Catalina Gómez Hoyos, and Mariano M. Escobar. "Study of Kinetic, Structure and Properties Evaluation of Organically Modified Montmorillonites and Micro Nanocellulose Added to Cement Paste." In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-84214.

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The effect of the addition of cellulose microfibrils, water soluble polymer, nanoclays and carbon nanotubes to the cement paste was studied. The hydration kinetic was determined by means of an adiabatic rise temperature method. The addition of polymer to the cement paste produced the highest delay in the hydration kinetic followed by the addition of organically modified montmorillonites in a polymer solution. Flexion and compression strength were determined. Some admixtures produced an increase of the cement paste’s void content. Cellulose produced a change in the rheology and a delay in the h

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Khromova, I., O. Mitrofanov, M. Navarro-Cia, et al. "Resonant terahertz absorption in carbon microfibres." In 2015 9th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS). IEEE, 2015. http://dx.doi.org/10.1109/metamaterials.2015.7342477.

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Silva, João Batista Lamari Palma e., Camila Tiemi Ozaki e Silva, Stephanie Cucolo Marçula, Rosa Cristina Cecche Lintz, and Luísa Andréia Gachet. "Análise de propriedades elétricas de argamassa armada com microfibras de carbono." In XV SIMPÓSIO BRASILEIRO DE TECNOLOGIA DAS ARGAMASSAS. ANTAC, 2025. https://doi.org/10.46421/sbta.v15.6735.

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Argamassas multifuncionais têm sido desenvolvidas para aplicações em sistemas de autossensoriamento, blindagem eletromagnética, proteção catódica, entre outras. Nesta pesquisa foi produzida argamassa baseada nos limites da norma NBR 11173 (argamassas armadas), com microfibra de carbono. Foram analisadas propriedades de resistências mecânicas e módulo de elasticidade, bem como elétricas, por meio da impedância e ângulo de fase. A partir dos resultados obtidos, constatou-se um aumento na resistência à tração na flexão, bem como na condutividade elétrica. Com isso, pode-se concluir que o traço es

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Holmes, Benjamin, Nathan J. Castro, Jian Li, and Lijie Grace Zhang. "Development of a Biomimetic Electrospun Microfibrous Scaffold With Multiwall Carbon Nanotubes for Cartilage Regeneration." In ASME 2013 2nd Global Congress on NanoEngineering for Medicine and Biology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/nemb2013-93202.

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Cartilage defects, which are caused by a variety of reasons such as traumatic injuries, osteoarthritis, or osteoporosis, represent common and severe clinical problems. Each year, over 6 million people visit hospitals in the U.S. for various knee, wrist, and ankle problems. As modern medicine advances, new and novel methodologies have been explored and developed in order to solve and improve current medical problems. One of the areas of investigation that has thus far proven to be very promising is tissue engineering [1, 2]. Since cartilage matrix is nanocomposite, the goal of the current work

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Rapports d'organisations sur le sujet "Carbon microfibrils"

Kretschmann, David, James Evans, Mike Wiemann, Bruce A. Kimball, and Sherwood B. Idso. Long-term effects of elevated carbon dioxide concentration on sour orange wood specific gravity, modulus of elasticity, and microfibril angle. U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 2007. http://dx.doi.org/10.2737/fpl-rn-307.

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