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https://www.readbyqxmd.com/read/28434434/local-structural-damage-evaluation-of-a-c-c-sic-ceramic-matrix-composite
#1
Benedicta D Arhatari, Matthew Zonneveldt, John Thornton, Brian Abbey
Ceramic matrix composites (CMCs) are structural materials, which have useful properties that combine high strength at high temperatures with moderate toughness. Carbon fibers within a matrix of carbon and silicon carbide, called C/C-SiC, are a particular class of CMC noted for their high oxidation resistance. Here we use a combination of four-point bending and X-ray radiography, to study the mechanical failure of C/C-SiC CMCs. Correlating X-ray radiographic and load/displacement curve data reveals that the fiber bundles act to slow down crack propagation during four-point bending tests...
April 24, 2017: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/28405030/splitting-co2-with-a-ceria-based-redox-cycle-in-a-solar-driven-thermogravimetric-analyzer
#2
M Takacs, S Ackermann, A Bonk, M Neises-von Puttkamer, Ph Haueter, J R Scheffe, U F Vogt, A Steinfeld
Thermochemical splitting of CO2 via a ceria-based redox cycle was performed in a solar-driven thermogravimetric analyzer. Overall reaction rates, including heat and mass transport, were determined under concentrated irradiation mimicking realistic operation of solar reactors. Reticulated porous ceramic (RPC) structures and fibers made of undoped and Zr(4+)-doped CeO2, were endothermally reduced under radiative fluxes of 1280 suns in the temperature range 1200-1950 K and subsequently re-oxidized with CO2 at 950-1400 K...
April 2017: AIChE Journal
https://www.readbyqxmd.com/read/28403361/effect-of-different-composite-core-materials-on-fracture-resistance-of-endodontically-treated-teeth-restored-with-frc-posts
#3
Prapaporn Panitiwat, Prarom Salimee
Objective: This study evaluated the fracture resistance of endodontically treated teeth restored with fiber reinforced composite posts, using three resin composite core build-up materials, (Clearfil Photo Core (CPC), MultiCore Flow (MCF), and LuxaCore Z-Dual (LCZ)), and a nanohybrid composite, (Tetric N-Ceram (TNC)). Material and Methods: Forty endodontically treated lower first premolars were restored with quartz fiber posts (D.T. Light-Post) cemented with resin cement (Panavia F2...
March 2017: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/28402738/ferrule-effect-dominates-over-use-of-a-fiber-post-when-restoring-endodontically-treated-incisors-an-in-vitro-study
#4
P Magne, P C Lazari, M A Carvalho, T Johnson, A A Del Bel Cury
OBJECTIVES: The aim of this study was to investigate the restoration of broken-down endodontically treated incisors with the ferrule effect using glass ceramic crowns bonded to composite resin core buildups with or without a fiber post. A no-ferrule group with post was also included for comparison. METHODS AND MATERIALS: Thirty decoronated endodontically treated bovine incisors with a 2-mm ferrule were restored with a direct buildup using a nanohybrid direct composite resin (Miris 2 and Optibond FL) with or without a glass-fiber-reinforced post...
April 12, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28381016/lasing-of-surface-polished-polycrystalline-ho-yag-yttrium-aluminum-garnet-fiber
#5
Hyunjun Kim, Randall S Hay, Sean A McDaniel, Gary Cook, Nicholas G Usechak, Augustine M Urbas, Kathleen N Shugart, HeeDong Lee, Ali H Kadhim, Dean P Brown, Benjamin Griffin, Geoff E Fair, Randall G Corns, Santeri A Potticary, Frank K Hopkins, Kent L Averett, David E Zelmon, Triplicane A Parthasarathy, Kristin A Keller
A polycrystalline 1.5% Ho: YAG fiber with a diameter of 31 µm was prepared. Surface roughness from grain boundary grooving was reduced by polishing, which decreased the fiber scattering coefficient from 76 m<sup>-1</sup> to 35 m<sup>-1</sup>. Lasing tests were done on this fiber with a SF57 Schott glass cladding. Lasing was confirmed by spectrum narrowing with threshold pump power lower than 500 mW and a slope efficiency of 7%. To our knowledge, this is the first lasing demonstration from a small diameter polycrystalline ceramic fiber...
March 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28380729/semiconductor-saturable-absorber-q-switching-of-a-holmium-micro-laser
#6
Ruijun Lan, Xavier Mateos, Yicheng Wang, Josep Maria Serres, Pavel Loiko, Jiang Li, Yubai Pan, Uwe Griebner, Valentin Petrov
We report on a Holmium micro-laser passively Q-switched by a semiconductor saturable absorber (SSA), for the first time to the best of our knowledge. It is based on a 1 at.% Ho:YAG ceramic with good energy storage capability and several commercial transmission-type SSAs with 0.24% modulation depth. Under in-band pumping by a Tm fiber laser at 1910 nm, the Ho micro-laser generated 450 mW at 2089 nm with 37% slope efficiency. Stable 89 ns, 3.2 μJ pulses are achieved at a repetition rate of 141 kHz. Further shortening of the laser pulses is feasible with the increase of the modulation depth of the SSA while power scaling may lead to Q-switching at MHz-range repetition rates...
March 6, 2017: Optics Express
https://www.readbyqxmd.com/read/28371150/polyester-fibers-can-be-rendered-calcium-phosphate-binding-by-surface-functionalization-with-bisphosphonate-groups
#7
Alessandro Polini, Daniela Geta Petre, Michele Iafisco, Sonia de Lacerda Schickert, Anna Tampieri, Jeroen van den Beucken, Sander C G Leeuwenburgh
Fibers are often used as structural elements to improve the mechanical properties of materials such as brittle ceramic matrices by facilitating the dissipation of energy. However, this energy dissipation is mainly controlled by the interface between the two components, and a poorly designed fiber-matrix interface strongly reduces the efficacy of fiber reinforcement. Here, we present a versatile approach to control the affinity of biocompatible fibers to calcium-containing matrices in order to maximize the efficacy of reinforcement of calcium phosphates based bioceramics by means of polymeric fibers...
March 28, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28368041/controllable-optical-modulation-of-blue-green-up-conversion-fluorescence-from-tm-3-er-3-single-doped-glass-ceramics-upon-two-step-excitation-of-two-wavelengths
#8
Zhi Chen, Shiliang Kang, Hang Zhang, Ting Wang, Shichao Lv, Qiuqun Chen, Guoping Dong, Jianrong Qiu
Optical modulation is a crucial operation in photonics for network data processing with the aim to overcome information bottleneck in terms of speed, energy consumption, dispersion and cross-talking from conventional electronic interconnection approach. However, due to the weak interactions between photons, a facile physical approach is required to efficiently manipulate photon-photon interactions. Herein, we demonstrate that transparent glass ceramics containing LaF3: Tm(3+) (Er(3+)) nanocrystals can enable fast-slow optical modulation of blue/green up-conversion fluorescence upon two-step excitation of two-wavelengths at telecom windows (0...
April 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28358045/glass-ceramic-optical-fiber-containing-ba2tisi2o8-nanocrystals-for-frequency-conversion-of-lasers
#9
Zaijin Fang, Xusheng Xiao, Xin Wang, Zhijun Ma, Elfed Lewis, Gerald Farrell, Pengfei Wang, Jing Ren, Haitao Guo, Jianrong Qiu
A glass-ceramic optical fiber containing Ba2TiSi2O8 nanocrystals fabricated using a novel combination of the melt-in-tube method and successive heat treatment is reported for the first time. For the melt-in-tube method, fibers act as a precursor at the drawing temperature for which the cladding glass is softened while the core glass is melted. It is demonstrated experimentally that following heat treatment, Ba2TiSi2O8 nanocrystals with diameters below 10 nm are evenly distributed throughout the fiber core...
March 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28350452/velcro-inspired-sic-fuzzy-fibers-for-aerospace-applications
#10
Amelia H C Hart, Ryota Koizumi, John Hamel, Peter Samora Owuor, Yusuke Ito, Sehmus Ozden, Sanjit Bhowmick, Syed Asif Syed Amanulla, Thierry Tsafack, Kunttal Keyshar, Rahul Mital, Janet Hurst, Robert Vajtai, Chandra Sekhar Tiwary, Pulickel M Ajayan
The most recent and innovative silicon carbide (SiC) fiber ceramic matrix composites, used for lightweight high-heat engine parts in aerospace applications, are woven, layered, and then surrounded by a SiC ceramic matrix composite (CMC). To further improve both the mechanical properties and thermal and oxidative resistance abilities of this material, SiC nanotubes and nanowires (SiCNT/NWs) are grown on the surface of the SiC fiber via carbon nanotube conversion. This conversion utilizes the shape memory synthesis (SMS) method, starting with carbon nanotube (CNT) growth on the SiC fiber surface, to capitalize on the ease of dense surface morphology optimization and the ability to effectively engineer the CNT-SiC fiber interface to create a secure nanotube-fiber attachment...
April 5, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28343925/influence-of-alveolar-bone-loss-and-cement-layer-thickness-on-the-biomechanical-behavior-of-endodontically-treated-maxillary-incisors-a-3-dimensional-finite-element-analysis
#11
Amanda Maria de Oliveira Dal Piva, João Paulo Mendes Tribst, Rodrigo Othávio de Assunção E Souza, Alexandre Luiz Souto Borges
INTRODUCTION: In order to understand the mechanical behavior of a weakened incisor, this study aimed to evaluate the stress distribution caused by different alveolar bone heights and cement layer thickness. METHODS: A finite element analysis was conducted for this investigation. An intact maxillary central incisor was initially modeled, and the bone of the models was modified in order to simulate 4 levels of bone height: BL0 (no bone loss), BL1 (1/3 bone loss), BL2 (1/2 bone loss), and BL3 (2/3 bone loss)...
March 23, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28336850/influence-of-solution-properties-and-process-parameters-on-the-formation-and-morphology-of-ysz-and-nio-ceramic-nanofibers-by-electrospinning
#12
Gerard Cadafalch Gazquez, Vera Smulders, Sjoerd A Veldhuis, Paul Wieringa, Lorenzo Moroni, Bernard A Boukamp, Johan E Ten Elshof
The fabrication process of ceramic yttria-stabilized zirconia (YSZ) and nickel oxide nanofibers by electrospinning is reported. The preparation of hollow YSZ nanofibers and aligned nanofiber arrays is also demonstrated. The influence of the process parameters of the electrospinning process, the physicochemical properties of the spinning solutions, and the thermal treatment procedure on spinnability and final microstructure of the ceramic fibers was determined. The fiber diameter can be varied from hundreds of nanometers to more than a micrometer by controlling the solution properties of the electrospinning process, while the grain size and surface roughness of the resulting fibers are mainly controlled via the final thermal annealing process...
January 13, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28266570/spectroscopic-properties-in-er-3-doped-germanotellurite-glasses-and-glass-ceramics-for-mid-infrared-laser-materials
#13
Shiliang Kang, Xiudi Xiao, Qiwen Pan, Dongdan Chen, Jianrong Qiu, Guoping Dong
Transparent Er(3+)-doped germanotellurite glass ceramics (GCs) with variable Te/Ge ratio were prepared by controllable heat-treated process. X-ray diffraction (XRD) and transmission electron microscope (TEM) confirmed the formation of nanocrystals in glass matrix. Raman spectra were used to investigate the evolution of glass structure and photon energy. Fourier transform infrared (FTIR) spectra were introduced to characterize the change of hydroxyl group (OH(-)) content. Enhanced 2.7 μm emission was achieved from Er(3+)-doped GCs upon excitation with a 980 nm laser diode (LD), and the influence of GeO2 concentration and heat-treated temperature on the spectroscopic properties were also discussed in detail...
March 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28242456/the-proangiogenic-potential-of-a-novel-calcium-releasing-composite-biomaterial-orthotopic-in-vivo-evaluation
#14
Hugo Oliveira, Sylvain Catros, Oscar Castano, Sylvie Rey, Robin Siadous, Douglas Clift, Joan Marti-Munoz, Marc Batista, Reine Bareille, Josep Planell, Elisabeth Engel, Joëlle Amédée
Insufficient angiogenesis remains a major hurdle in current bone tissue engineering strategies. An extensive body of work has focused on the use of angiogenic factors or endothelial progenitor cells. However, these approaches are inherently complex, in terms of regulatory and methodologic implementation, and present a high cost. We have recently demonstrate the potential of electrospun poly(lactic acid) (PLA) fiber-based membranes, containing calcium phosphate (CaP) ormoglass particles, to elicit angiogenesis in vivo, in a subcutaneous model in mice...
February 24, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28218658/uw-imaging-of-seismic-physical-models-in-air-using-fiber-optic-fabry-perot-interferometer
#15
Qiangzhou Rong, Yongxin Hao, Ruixiang Zhou, Xunli Yin, Zhihua Shao, Lei Liang, Xueguang Qiao
A fiber-optic Fabry-Perot interferometer (FPI) has been proposed and demonstrated for the ultrasound wave (UW) imaging of seismic-physical models. The sensor probe comprises a single mode fiber (SMF) that is inserted into a ceramic tube terminated by an ultra-thin gold film. The probe performs with an excellent UW sensitivity thanks to the nanolayer gold film, and thus is capable of detecting a weak UW in air medium. Furthermore, the compact sensor is a symmetrical structure so that it presents a good directionality in the UW detection...
February 17, 2017: Sensors
https://www.readbyqxmd.com/read/28212978/a-systematic-review-of-the-survival-and-complication-rates-of-inlay-retained-fixed-dental-prostheses
#16
REVIEW
Junyu Chen, He Cai, Lai Suo, Yiyuan Xue, Jian Wang, Qianbing Wan
OBJECTIVES: The aim of this systematic review was to investigate the survival and complication rates of inlay-retainer fixed dental prostheses (IRFDPs). DATA/SOURCES: A systematic search was conducted in the PubMed, EMBASE, and Cochrane Library databases in English and time filters (articles published from 1960) were used. STUDY SELECTION: Randomized controlled trails (RCTs), controlled clinical trials (CCTs) and prospective cohort studies on IRFDPs with a mean follow-up period of at least 2 years were included...
February 23, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28196165/effect-of-cervical-collar-removal-on-the-fracture-load-of-anterior-zirconia-crowns
#17
Fernanda Campos, Mayra Cardoso, Renata Marques de Melo, Marco Antonio Bottino, Rodrigo Oa Souza
The objective of this study was to assess the influence of the extension of collar and fatigue cycling on the fracture load of anterior zirconia crowns. A total of 60 anterior full-crown preparations (central incisor) were machined in glass fiber-filled epoxy resin. Zirconia copings were designed and milled using computer-aided design/computer-assisted manufacture (thickness: buccal = 0.62 mm, lingual = 0.65 mm, incisal = 0.72 mm). The cervical collars (occlusogingival height = 0.8 mm, buccolingual width = 1...
March 2017: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/28188891/3-2-deoxy-%C3%AE-d-erythro-pentafuranosyl-pyrimido-1-2-%C3%AE-purin-10-3h-one-deoxyguanosine-adducts-of-workers-exposed-to-asbestos-fibers
#18
Stefano Bonassi, Filippo Cellai, Armelle Munnia, Donatella Ugolini, Alfonso Cristaudo, Monica Neri, Mirta Milić, Alessandra Bonotti, Roger W Giese, Marco E M Peluso
Asbestos is the commercial name for a group of silicate minerals naturally occurring in the environment and widely used in the industry. Asbestos exposure has been associated with pulmonary fibrosis, mesothelioma, and malignancies, which may appear after a period of latency of 20-40 years. Mechanisms involved in the carcinogenic effects of asbestos are still not fully elucidated, although the oxidative stress theory suggests that phagocytic cells produce large amounts of reactive oxygen species, due to their inability to digest asbestos fiber...
March 15, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/28111383/fracture-strength-of-cad-cam-fabricated-lithium-disilicate-and-resin-nano-ceramic-restorations-used-for-endodontically-treated-teeth
#19
Merve Bankoğlu Güngör, Bilge Turhan Bal, Handan Yilmaz, Cemal Aydin, Seçil Karakoca Nemli
The purpose of the present study was to evaluate and compare the fracture strength and failure modes of endocrowns, zirconia post, and fiber post supported restorations and predict the clinical outcomes of six different prostheses used for endodontically treated teeth. Sixty (n=10) maxillary central incisors were restored with zirconia post/resin-nano-ceramic crown (ZrRNC), fiber post/resinnano-ceramic crown (FbRNC), zirconia post/lithium disilicate ceramic crown (ZrLDS), fiber post/lithium disilicate ceramic crown (FbLDS), resin-nano-ceramic endocrown (EndoRNC), and lithium disilicate ceramic endocrown (EndoLDS)...
March 31, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28040948/fiber-based-modulated-optical-reflectance-configuration-allowing-for-offset-pump-and-probe-beams
#20
A Fleming, C Folsom, C Jensen, H Ban
A new fiber-based modulated optical reflectance configuration is developed in this work. The technique maintains the fiber-based heating laser (pump) and detection laser (probe) in close proximity at a fixed separation distance in a ceramic ferrule. The pump beam periodically heats the sample inducing thermal waves into the sample. The probe beam measures the temperature response at a known distance from the pump beam over a range of heating modulation frequencies. The thermal diffusivity of the sample may be calculated from the phase response between the input heat flux and the temperature response of a sample having a reflective surface...
December 2016: Review of Scientific Instruments
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