Crystalline Fibers
Mostrando 1-12 de 33 artigos, teses e dissertações.
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1. Mullite macro-needles for reinforcement of refractory castables
Abstract Ceramic macro-needles incorporation as reinforcement in commercial refractory castable was studied. Ceramic macro-needles (Ø2x20 mm) were made from kaolinite clay and gibbsite to obtain mullite as the main crystalline phase. Specimens with the ceramic reinforcement were evaluated by compression after being treated at two temperatures (815 and 1400
Cerâmica. Publicado em: 2022
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2. CELLULOSE NANOFIBERS FROM CASSAVA AGRO-INDUSTRIAL WASTE AS REINFORCEMENT IN PVA FILMS
Cellulose nanofibers (CNF) have been applied in composite systems due to the abundance of raw material, excellent mechanical and thermal properties. In this work, CNF was prepared from agroindustrial waste and used in specified amounts in polyvinyl alcohol (PVA) composites. The FTIR spectra of CNF, chemically purified cellulose (CPC) and Cassava Agro-industr
Quím. Nova. Publicado em: 2020-06
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3. An Evaluation of the Dielectric Barrier Discharge Treatment on the Mechanical, Structural and Morphological Properties of Carbon Fibers
ABSTRACT: Carbon fibers (CFs) have been widely applied in the manufacture of polymeric composites. The mechanical properties of these composites depend on the adhesion in the matrix/CF interface. Since the CFs have poor adhesion properties, a surface treatment of the CFs becomes necessary. The plasma process used in this work was the dielectric barrier disch
J. Aerosp. Technol. Manag.. Publicado em: 29/03/2018
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4. Effect of Alkaline and Hot Water Treatments on the Structure and Morphology of Piassava Fibers
The effect of alcaline and hot water surface treatments of piassava Attalea funifera fibers was investigated. The efficiency of each treatment was evaluated by Fourier transform infrared spectroscopy, X-ray diffractometry, optical microscopy, scanning electron microscopy and atomic force microscopy. The alkaline treatments were effective in removing the supe
Mat. Res.. Publicado em: 01/02/2018
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5. Dynamic mechanical analysis and crystalline analysis of hemp fiber reinforced cellulose filled epoxy composite
Abstract The Dynamic mechanical behavior of chemically treated and untreated hemp fiber reinforced composites was investigated. The morphology of the composites was studied to understand the interaction between the filler and polymer. A series of dynamic mechanical tests were performed by varying the fiber loading and test frequencies over a range of testing
Polímeros. Publicado em: 2017-12
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6. Variation of structures of ingredients of desiccated coconut during hydrolysis by hydrochloric acid at low temperature
Abstract Owing to the high content of lignocellulose, desiccated coconut become a healthy material for dietary fiber supplementation. In this study, the changes in solubility of the fibers of desiccated coconut were evaluated. The changes of the pHs and weight losses were studied. Furthermore, variations of the ingredient structures of desiccated coconut by
Food Sci. Technol. Publicado em: 26/10/2017
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7. The effect of hot multistage drawing on molecular structure and optical properties of polyethylene terephthalate fibers
In this work, mechanical and structural parameters related to the optical properties of polyethylene terephthalate (PET) fibers drawn at hot multistage have been investigated. The changes in optical parameters upon changing draw ratio are used to obtain the mechanical orientation factors
and , various orientation functions f2(θ), f4 Materials Research. Publicado em: 17/07/2012
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8. Materials produced from plant biomass: part II: evaluation of crystallinity and degradation kinetics of cellulose
In this study Eucalyptus grandis (CEG) and Pinus taeda (CPT) cellulose fibers obtained from kraft and sulfite pulping process, respectively, were characterized using Fourier transform infrared (FTIR) spectroscopy and thermogravimetry (TGA). The degradation kinetic parameters were determined by TGA using Coats and Redfern method. FTIR results showed that CPT
Materials Research. Publicado em: 22/05/2012
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9. CRYSTALLINE FLUORIDE FIBER LASER AND CHARACTERIZATION OF RARE EARTH DOPED FIBERS / Laser de fibra monocristalina de fluoretos e caracterização de fibras dopadas com terras raras
Diode pumped solid state lasers have supplied a large part of the search for high power lasers, with good beam quality, in addition, these lasers are useful for generation of visible laser radiation. Fiber lasers have the capacity to reach these high powers with a good beam quality, due to its special design which confines the radiation through long fiber le
Publicado em: 2008
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10. Casca de arroz processada via enzimólise como fonte de carbono para produção de celulose por Acetobacter xylinum / Rice husk processed with hidrolityc enzimes as source of carbon for the production of bacterial cellulose by Acetobacter xylinum
Bacterial cellulose (BC) has been applied in the electronic industry and in medicine as a wound dressing film. However, the high manufacturing cost limits its wide-scale use. To reduce the costs of the process and obtain a differentiated product, this work proposes the use of rice husk as a substrate for the production of BC, since it consists of minerals, c
Publicado em: 2008
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11. Elaboration and characterization of nanostructured biocements for biomedical applications
Biocements formed from the composition Ca/P have been studied and developed since 1983. These biomaterials are promissing and have aroused great interest to biomedical surgery applications, fixation of prostheses and filling and reconstruction of bones. They can be employed as an element of load to fix implant and bone structure. In addition, biocements are
Materials Research. Publicado em: 2007-06
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12. Processamento de compósitos de poli (tereftalato de etileno) reciclado reforçado com fibras de vidro
In this work, flake and post-condensed PET composites of different glass fiber contents (0, 20, 30 and 40%) were prepared. Tow kinds of fibers were employed: one fiber having an amino silane-based surface treatment and another one having an epoxi silane-based surface treatment. The composites were extruded in a single-screw extruder with a barrier double-fli
Publicado em: 2007