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https://www.readbyqxmd.com/read/29442772/mechanical-and-electrical-properties-of-direct-spun-carbon-nanotube-fibers-exposed-to-ultrahigh-temperatures-in-vacuum
#1
Xiao-Shan Zhang, Ling-Wei Yang, Hai-Tao Liu, Mei Zu
Carbon nanotube (CNT) fibers are promising reinforcements in ceramic matrix composites where the service environments involve extremely high temperatures that are generally beyond 1000 °C. This work focuses on the thermal stability of a direct spun CNT fiber in vacuum and in a wide temperature (25-2000 °C). The microstructure, mechanical and electrical properties of the fibers as a function of the heat-treatment temperature were investigated. The results show that high temperature exposure could increase the defect density and loosen the packing state of the fiber, but enhance the graphitization degree of the CNTs...
June 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29434426/reappraisal-of-percutaneous-transluminal-laser-angioplasty
#2
REVIEW
Shoichi D Takekawa
Background and aims: We devised a technique to treat peripheral arterial disease (PAD) with laser, i.e. percutaneous transluminal laser angioplasty (PTLA). Considerable good results were obtained with PTLA, but it is apparently considered obsolete as a technique to treat occlusive arterial disease of peripheral arteries, perhaps because of the development and improvement of stents and the ease of their use compared to the somewhat intricate technique required for PTLA. Although the author admits the usefulness of stents, they are foreign to a human body...
December 31, 2017: Laser Therapy
https://www.readbyqxmd.com/read/29413864/simultaneous-measurements-of-ascorbate-and-glutamate-in-vivo-in-the-rat-brain-using-carbon-fiber-nanocomposite-sensors-and-microbiosensor-arrays
#3
Nuno R Ferreira, Ana Ledo, João Laranjinha, Greg A Gerhardt, Rui M Barbosa
Nanocomposite sensors consisting of carbon fiber microelectrodes modified with Nafion® and carbon nanotubes, and ceramic-based microelectrode biosensor arrays were used to measure ascorbate and glutamate in the brain with high spatial, temporal and chemical resolution. Nanocomposite sensors displayed electrocatalytic properties towards ascorbate oxidation, translated into a negative shift from +0.20V to -0.05V vs. Ag/AgCl, as well as a significant increase (10-fold) of electroactive surface area. The estimated average basal concentration of ascorbate in vivo in the CA1, CA3 and dentate gyrus (DG) sub regions of the hippocampus were 276±60μM (n=10), 183±30μM (n=10) and 133±42μM (n=10), respectively...
January 31, 2018: Bioelectrochemistry
https://www.readbyqxmd.com/read/29411972/3d-fiber-network-reinforced-bicontinuous-composite-solid-electrolyte-for-dendrite-free-lithium-metal-batteries
#4
Dan Li, Long Chen, Tianshi Wang, Li-Zhen Fan
Replacement of flammable organic liquid electrolytes with solid Li+ conductors is a promising approach to realize excellent performance of Li metal batteries. However, ceramic electrolytes are either easily reduced by Li metal or penetrated by Li dendrites through their grain boundaries, and polymer electrolytes are also faced with instability on the electrode/electrolyte interface and weak mechanical property. Here we report a 3D fiber-network reinforced bicontinuous solid composite electrolyte with flexible Li+-conductive network (lithium aluminum titanium phosphate (LATP)/polyacrylonitrile (PAN)), which helps to enhance electrochemical stability on the electrode/electrolyte interface by isolating Li and LATP, and suppress Li dendrites growth by mechanical reinforcement of fiber-network for the composite solid electrolyte...
February 7, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29387618/fracture-resistance-of-tilted-premolars-restored-with-different-post-core-systems
#5
Khalid M Abdelaziz, Ashraf A Khalil, Ibrahim Y Alsalhi, Ali J Almufarrij, Ahmed Y Mojathel
Aims and Objective: To assess the effect of root tilt on the fracture resistance and failure pattern of endodontically-treated premolars restored with different post-core systems. Materials and Methods: Ninety endodontically-treated premolars were mounted in acrylic blocks with 0°, 12°, and 24° axial root tilt. Teeth in each group were restored in three subgroups with cast post-core, readymade metal posts and composite cores, and fiber post and composite cores...
November 2017: Journal of International Society of Preventive & Community Dentistry
https://www.readbyqxmd.com/read/29385032/disilicate-dental-ceramic-surface-preparation-by-1070-nm-fiber-laser-thermal-and-ultrastructural-analysis
#6
Carlo Fornaini, Federica Poli, Elisabetta Merigo, Nathalie Brulat-Bouchard, Ahmed El Gamal, Jean-Paul Rocca, Stefano Selleri, Annamaria Cucinotta
Lithium disilicate dental ceramic bonding, realized by using different resins, is strictly dependent on micro-mechanical retention and chemical adhesion. The aim of this in vitro study was to investigate the capability of a 1070 nm fiber laser for their surface treatment. Samples were irradiated by a pulsed fiber laser at 1070 nm with different parameters (peak power of 5, 7.5 and 10 kW, repetition rate (RR) 20 kHz, speed of 10 and 50 mm/s, and total energy density from 1.3 to 27 kW/cm²) and the thermal elevation during the experiment was recorded by a fiber Bragg grating (FBG) temperature sensor...
January 31, 2018: Bioengineering
https://www.readbyqxmd.com/read/29373487/the-mechanical-properties-of-biocompatible-apatite-bone-cement-reinforced-with-chemically-activated-carbon-fibers
#7
Anne V Boehm, Susanne Meininger, Annemarie Tesch, Uwe Gbureck, Frank A Müller
Calcium phosphate cement (CPC) is a well-established bone replacement material in dentistry and orthopedics. CPC mimics the physicochemical properties of natural bone and therefore shows excellent in vivo behavior. However, due to their brittleness, the application of CPC implants is limited to non-load bearing areas. Generally, the fiber-reinforcement of ceramic materials enhances fracture resistance, but simultaneously reduces the strength of the composite. Combining strong C-fiber reinforcement with a hydroxyapatite to form a CPC with a chemical modification of the fiber surface allowed us to adjust the fiber-matrix interface and consequently the fracture behavior...
January 26, 2018: Materials
https://www.readbyqxmd.com/read/29346725/rapid-chemical-vapor-infiltration-of-silicon-carbide-minicomposites-at-atmospheric-pressure
#8
Kenneth Petroski, Shannon Poges, Chris Monteleone, Joseph Grady, Ram Bhatt, Steven L Suib
The chemical vapor infiltration technique is one of the most popular for the fabrication of the matrix portion of a ceramic matrix composite. This work focuses on tailoring an atmospheric pressure deposition of silicon carbide onto carbon fiber tows using the methyltrichlorosilane (CH3SiCl3) and H2 deposition system at atmospheric pressure to create minicomposites faster than low pressure systems. Adjusting the flow rate of H2 bubbled through CH3SiCl3 will improve the uniformity of the deposition as well as infiltrate the substrate more completely as the flow rate is decreased...
January 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29341858/respiratory-assessment-of-refractory-ceramic-fibers-in-a-heating-technician-population
#9
David Lucas, Vincent Clamagirand, Pascale Capellmann, Agnès Hervé, Gilles Mauguen, Yannik Le Mer, Dominique Jegaden
Refractory ceramic fibers (RCF) have been extensively used for insulation in condensing boilers. The aim of this study was to evaluate the respiratory exposure to these fibers among maintenance heating technicians. We first created a working group (Carsat Brittany and Finistère Occupational Health Services) and carried out a sampling strategy. Atmospheric measurements were done during work tasks, and filters were analyzed by phase contrast microscopy (PCM) and scanning electron microscopy (SEM) in French approved laboratories...
January 17, 2018: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/29329225/optical-fiber-demodulation-system-with-high-performance-for-assessing-fretting-damage-of-steam-generator-tubes
#10
Peijian Huang, Ning Wang, Junying Li, Yong Zhu, Jie Zhang, Zhide Xi
In order to access the fretting damage of the steam generator tube (SGT), a fast fiber Fabry-Perot (F-P) non-scanning correlation demodulation system based on a super luminescent light emitting diode (SLED) was performed. By demodulating the light signal coming out from the F-P force sensor, the radial collision force between the SGT and the tube support plate (TSP) was interrogated. For higher demodulation accuracy, the effects of the center wavelength, bandwidth, and spectrum noise of SLED were discussed in detail...
January 12, 2018: Sensors
https://www.readbyqxmd.com/read/29305571/laser-application-to-the-root-surface-increases-the-bonding-strength-of-surface-treated-prefabricated-glass-fiber-posts-in-teeth-with-excessive-substance-loss
#11
Zuhal Gorus, Ayse Mese, Berivan Dundar Yilmaz, Ozkan Adiguzel
BACKGROUND This study examined the effect of roughening of the root surface using an erbium-doped yttrium aluminum garnet (Er: YAG) laser on the binding strength of teeth undergoing root canal treatment. MATERIAL AND METHODS Ninety single-rooted teeth were used and assigned randomly to 9 groups (n=10 each). Root canals were prepared using the FlexMaster rotary system. An Er: YAG laser was applied to the root canals in Group 1, with no surface treatment of the glass-fiber post. In Group 2, aluminum oxide particles were applied...
January 6, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29280967/biomarkers-for-pulmonary-inflammation-and-fibrosis-and-lung-ventilation-function-in-chinese-occupational-refractory-ceramic-fibers-exposed-workers
#12
Xiaojun Zhu, Yishuo Gu, Wenjun Ma, Panjun Gao, Mengxuan Liu, Pei Xiao, Hongfei Wang, Juan Chen, Tao Li
Refractory ceramic fibers (RCFs) can cause adverse health effects on workers' respiratory system, yet no proper biomarkers have been used to detect early pulmonary injury of RCFs-exposed workers. This study assessed the levels of two biomarkers that are related to respiratory injury in RCFs-exposed workers, and explored their relations with lung function. The exposure levels of total dust and respirable fibers were measured simultaneously in RCFs factories. The levels of TGF-β1 and ceruloplasmin (CP) increased with the RCFs exposure level (p < 0...
December 27, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29251451/cad-cam-post-and-core-using-different-esthetic-materials-fracture-resistance-and-bond-strengths
#13
Denis Roberto Falcão Spina, Rogério Goulart da Costa, Isabelli Carolini Farias, Leonardo Gonçalves da Cunha, André Vicente Ritter, Carla Castiglia Gonzaga, Giselle Maria Correr
PURPOSE: To evaluate the fracture resistance (FR), and push-out bond strengths (BS) of custom-made CAD/CAM post-and-cores manufactured with different esthetic materials. METHODS: 90 single-rooted extracted teeth were selected, endodontically treated and prepared to receive the posts. The specimens were randomly divided into three equal groups according to the material: hybrid ceramic Vita Enamic (HC); nano-ceramic resin composite Lava Ultimate (RC); and experimental epoxy-resin reinforced by glass-fiber (FG)...
December 2017: American Journal of Dentistry
https://www.readbyqxmd.com/read/29244887/carbon-fiber-framework-for-full-arch-implant-supported-fixed-dental-prostheses-supporting-resin-based-composite-and-lithium-disilicate-ceramic-crowns-case-report-and-description-of-features
#14
Giuseppe Castorina
This case report presents a new approach for shock-absorbing carbon-fiber composite frameworks for full-arch implant-supported fixed dental prostheses supporting resin-based and lithium disilicate ceramic crowns. It describes the characteristics of the materials used, the procedures for implementing the framework, and the requirements to achieve the best mechanical and clinical properties. The result is a full-arch prosthesis with masticatory load shock-absorption capacities, chemical bonding between materials, good esthetics, and wear similar to natural enamel...
December 15, 2017: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/29211127/evaluation-of-stress-distribution-in-endodontically-weakened-teeth-restored-with-different-crown-materials-3d-fea-analysis
#15
Izabela C M Moris, Carolina Alves Moscardini, Luana Kelle Batista Moura, Yara Teresinha Corrêa Silva-Sousa, Erica Alves Gomes
This study evaluated the stress distribution in endodontically treated teeth, weakened (W) or not weakened (NW), restored with different materials of prosthetic crown using 3D-FEA. Models of a maxillary canine were constructed based on micro-CT images and divided into the groups: G1 (control) - sound tooth; G2 to G7 - endodontically treated teeth restored with glass fiber post (GFP); which G2 to G4 simulated NW root and G5 to G7 simulated W root. For crown material the teeth were restored with: G2 and G5: metallic coping and ceramic veneering, G3 and G6: zirconia coping and ceramic veneering, G4 and G7: alumina coping and ceramic veneering...
November 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/29195390/an-embeddable-optical-strain-gauge-based-on-a-buckled-beam
#16
Yang Du, Yizheng Chen, Chen Zhu, Yiyang Zhuang, Jie Huang
We report, for the first time, a low cost, compact, and novel mechanically designed extrinsic Fabry-Perot interferometer (EFPI)-based optical fiber sensor with a strain amplification mechanism for strain measurement. The fundamental design principle includes a buckled beam with a coated gold layer, mounted on two grips. A Fabry-Perot cavity is produced between the buckled beam and the endface of a single mode fiber (SMF). A ceramic ferrule is applied for supporting and orienting the SMF. The principal sensor elements are packaged and protected by two designed metal shells...
November 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29178150/towards-a-kieselguhr-and-pvpp-free-clarification-and-stabilization-process-of-rough-beer-at-room-temperature-conditions
#17
Alessio Cimini, Mauro Moresi
In this work, the main constraint (that is, beer chilling and chill haze removing) of the current beer conditioning techniques using Kieselguhr filtration and Polyvinylpolypyrrolidone (PVPP) treatment was overcome by developing a novel higher-throughput conditioning process, operating at room temperatures with no use of filter aids. The effect of filtration temperature (TF ) in the range of 0 to 40 °C on the hydraulic permeability of ceramic hollow-fiber (HF) membranes with nominal pore size of 0.2 to 1.4 μm, as well as on their limiting permeation flux (J* ) when feeding precentrifuged rough beer, was preliminarily assessed...
November 27, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/29170562/enhanced-durability-of-carbon-nanotube-grafted-hierarchical-ceramic-microfiber-reinforced-epoxy-composites
#18
Ajay Krishnamurthy, Donald L Hunston, Amanda L Forster, Bharath Natarajan, Andrew H Liotta, Sunny S Wicks, Paul E Stutzman, Brian L Wardle, J Alexander Liddle, Aaron M Forster
As carbon nanotube (CNT) infused hybrid composites are increasingly identified as next-generation aerospace materials, it is vital to evaluate their long-term structural performance under aging environments. In this work, the durability of hierarchical, aligned CNT grafted aluminoborosilicate microfiber-epoxy composites (CNT composites) are compared against baseline aluminoborosilicate composites (baseline composites), before and after immersion in water at 25 °C (hydro) and 60 °C (hydrothermal), for extended durations (90 d and 180 d)...
December 2017: Carbon
https://www.readbyqxmd.com/read/29144425/selective-laser-sintering-of-porous-silica-enabled-by-carbon-additive
#19
Shuai Chang, Liqun Li, Li Lu, Jerry Ying Hsi Fuh
The aim of this study is to investigate the possibility of a freeform fabrication of porous ceramic parts through selective laser sintering (SLS). SLS was proposed to manufacture ceramic green parts because this additive manufacturing technique can be used to fabricate three-dimensional objects directly without a mold, and the technique has the capability of generating porous ceramics with controlled porosity. However, ceramic printing has not yet fully achieved its 3D fabrication capabilities without using polymer binder...
November 16, 2017: Materials
https://www.readbyqxmd.com/read/29124996/a-30-year-mortality-and-respiratory-morbidity-study-of-refractory-ceramic-fiber-workers
#20
Grace LeMasters, James E Lockey, Timothy J Hilbert, Linda S Levin, Jeff W Burkle, Ralph Shipley, Charles Perme, Cristopher A Meyer, Carol H Rice
AIM: Report mortality (n = 1119), cancer incidence (n = 1207) and radiographic (n = 1451) findings from a 30-year investigation of current and former refractory ceramic fiber (RCF) workers. METHODS: Cause of death, health and work histories, radiographs and spirometry were collected. Mortality and cancer incidence were analyzed. Logistic regression analysis investigated the associations of latency and cumulative fiber exposure (CFE) on radiographic changes...
August 2017: Inhalation Toxicology
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