scholarly journals Scanning Electron Microscope Configuration of Recycled Carbon Fiber Composites: Mini Review

2019 ◽  
Author(s):  
Seyed Hossein Mamanpush ◽  
Azadeh Tavousi Tabatabaei
Keyword(s):  
Electron Microscope ◽  
Carbon Fiber ◽  
Scanning Electron Microscope ◽  
Fiber Composites ◽  
Carbon Fiber Composites ◽  
Pull Out ◽  
Heat Treated ◽  
Significant Difference ◽  
Carbon Fiber Epoxy ◽  
Scanning Electron

Carbon fiber composites (CFCs) were mechanically refined and classified the scanning electron microscope (SEM) configuration of untreated and heat-treated mechanically recycled carbon fiber epoxy and carbon fiber vinyl ester composite were examined by using scanning electron microscopy (SEM). SEM Results indicate that the main defects in the structure of recycled CFCs are broken fibers, fiber pull-out, fiber-matrix separation. Also Comparing SEM of untreated and heat-treated recycled CFC indicates that there is no significant difference between their micrographs.

Electrohydrodynamic Casting Polymeric Carbon Nanofibers From Different Precursors for the Hyperthermia Application

2018 ◽  
Author(s):  
Nadia N. Boutros ◽  
Ann D. Chen ◽  
Ryan N. Gan ◽  
Yong X. Gan
Keyword(s):  
Heat Treatment ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Carbon Nanofiber ◽  
Test Sample ◽  
Fiber Composites ◽  
Metal Salts ◽  
Heat Treated ◽  
Polymeric Carbon ◽  
Scanning Electron

The purpose of this work was to develop and analyze different materials that would be able to create the partially carbonized nanofibers through electrohydrodynamic casting followed by heat treatment. Test samples were created with different precursors containing polymer solutions and different added metal salts. After performing a series of steps to create each test sample, the sample was heat-treated to generate carbon nanofiber composites. The morphology of the carbon nanofiber composites was observed using a scanning electron microscope. Hyperthermia tests on typical fiber composites were performed.

Preparation of Biodegradable Gradient Polymer by Microwave

2011 ◽  
Vol 236-238 ◽  
pp. 1949-1953 ◽  
Author(s):  
Ji Yan Liu ◽  
Xue Qing Liu
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Polymeric Membrane ◽  
Thickness Direction ◽  
Composition And Structure ◽  
Significant Difference ◽  
Gradient Variation ◽  
Percentage Ratio ◽  
Scanning Electron

A biodegradable gradient polymeric membrane based on chitosan (CS) and polyvinyl alcohol (PVA) has been prepared by microwave technique. The composition and morphology variation along the thickness direction in membrane were measured by elemental analysis and scanning electron microscope (SEM). The tensile properties of CS/PVA gradient membrane were tested. Results showed that the content of either polymer shows a gradient variation along the thickness direction. SEM photographs exhibit that morphology also evolves gradually with the varying percentage ratio of two polymers. As a result of such variations in composition and structure, the mechanical properties on both sides exhibit a significant difference. Compared with conventional isotropic membrane, gradient membrane has improved mechanical properties.

Influence of prophylaxis on the microleakage of sealants: in vitro study

2002 ◽  
Vol 26 (4) ◽  
pp. 371-375 ◽  
Author(s):  
Ana Beatriz Alonso Chevitarese ◽  
Orlando Chevitarese ◽  
Ivete Pomarico Ribeiro de Souza ◽  
Roberto Braga de Carvalho Vianna
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
In Vitro Study ◽  
Optical Microscope ◽  
Vitro Study ◽  
Significant Difference ◽  
Group A ◽  
Group B ◽  
Scanning Electron

The aim of this study was to evaluate the influence of prophylaxis on the sealants microleakage in 30 premolars divided into: Group A, Group B and Group C. The teeth were analyzed using the optical microscope (OM) and at scanning electron microscope (SEM). There was a statitical significant difference among the groups regarding the presence of microleakage, but not with the presence of tags.

Metallography and Corrosion Product Studies on Archaeological Bronze Fragments from the Qu Cun Site

1996 ◽  
Vol 462 ◽  
Author(s):  
W. T. Chase ◽  
Quanyu Wang
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Corrosion Product ◽  
Electron Microprobe ◽  
X Ray Diffraction ◽  
X Ray ◽  
Heat Treated ◽  
Western Zhou ◽  
Future Work ◽  
Scanning Electron

ABSTRACTThe authors studied a suite of fragments of corroded bronzes from the Tienma-Qu Cun site, a Western Zhou city and cemetery complex dating from ca. 1000 to ca. 650 B.C‥ Conventional metallographic techniques were used along with scanning electron microscope, electron microprobe and x-ray diffraction. The bronzes are very varied in structure and composition. Most are cast, moderate-tin bronzes, but some are high or low in tin or lead. A few show a worked and annealed structure, and some of the cast bronzes were also heat treated (possibly by use as cooking pots). corrosion patterns also vary greatly, from almost uncorroded to total mineralization. Periodic and esquential corrosion phenomena were detected, as well as patination applied when the bronzes were made. We had hoped to be able to ascertain the causes of the different penetration of corrosion in these samples, but that must remain for future work.

scholarly journals Evaluation of two different root-end cavity preparation techniques: A scanning electron microscope study

2013 ◽  
Vol 07 (02) ◽  
pp. 186-190 ◽  
Author(s):  
Seda Aydemir ◽  
Hale Cimilli ◽  
Afife Binnaz Hazar Yoruç ◽  
Nevin Kartal
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Control Group ◽  
Laser Materials ◽  
Cavity Preparation ◽  
Scanning Electron Microscope Study ◽  
Yag Laser ◽  
Significant Difference ◽  
Laser Group ◽  
Scanning Electron

ABSTRACT Objective: In this study, we aimed to evaluate and compare the dentinal walls of root-end cavities for the presence of cracks after cavity preparation using US retrotips and Er: YAG laser. Materials and Methods: Fifty single-rooted teeth were prepared by Protaper NiTi rotary system and obturated by lateral condensation. Three milimeters of root-end was resected. Twenty teeth were prepared with US retrotip (Group 1), 20 teeth with Er: YAG laser (Group 2), and 10 teeth without retropreparation (control group). The root-end surfaces were examined under a scanning electron microscope (SEM). Then the cracks of the resected root surfaces were evaluated on microphotographs. Results: No statistically significant difference was detected between US Group and Laser Group for complete, incomplete, intradentinal, and total number of cracks (P = 0.47, P = 0.80, P = 0.69, P = 0.869, respectively). Conclusion: Statistical analysis revealed no significant effect of retropreparation technique on the development of apical cracks (P > 0.05).

Electromechanical study of carbon fiber composites

1998 ◽  
Vol 13 (11) ◽  
pp. 3081-3092 ◽  
Author(s):  
Xiaojun Wang ◽  
Xuli Fu ◽  
D. D. L. Chung
Keyword(s):  
Carbon Fiber ◽  
Electrical Resistance ◽  
Fiber Composites ◽  
Single Fiber ◽  
Fiber Direction ◽  
Carbon Fiber Composites ◽  
Fiber Waviness ◽  
Pull Out ◽  
The Matrix ◽  
Fiber Matrix

Electromechanical testing involving simultaneous electrical and mechanical measurements under load was used to study the fiber-matrix interface, the fiber residual compressive stress, and the degree of marcelling (fiber waviness) in carbon fiber composites. The interface study involved single fiber pull-out testing while the fiber-matrix contact electrical resistivity was measured. The residual stress study involved measuring the electrical resistance of a single fiber embedded in the matrix while the fiber was subjected to tension through its exposed ends. The marcelling study involved measuring the electrical resistance of a composite in the through-thickness direction while tension within the elastic regime was applied in the fiber direction.

Preparation of TiO2/CNT Composites and Effect of CNT's Structure on Morphology of Nano-TiO2

2013 ◽  
Vol 750-752 ◽  
pp. 259-264
Author(s):  
Feng Li ◽  
He Bian ◽  
Hui Zhang
Keyword(s):  
Heat Treatment ◽  
Carbon Fiber ◽  
Sol Gel ◽  
Fiber Composites ◽  
Carbon Fiber Composites ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure And Morphology ◽  
Morphology And Structure ◽  
Scanning Electron

Four kinds of TiO2/CNT (or carbon fiber) composites were successfully prepared by the sol-gel method using Ti(OBu)4 as precursor of TiO2, and untreated CNT, carboxylic CNT, hydroxylated CNT and carbon fiber were used as carriers, respectively. After heat treatment at 400 and 800°C, TiO2/CNT nanocomposites and purified TiO2 were obtained. Their structure and morphology were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results indicate that different carbon nanotubes and nanofiber have notable influences on the morphology and structure of TiO2 nanocrystals.

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