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https://www.readbyqxmd.com/read/28799331/flexible-sic-si3n4-composite-nanofibers-with-in-situ-embedded-graphite-for-highly-efficient-electromagnetic-wave-absorption
#1
Peng Wang, Laifei Cheng, Yani Zhang, Litong Zhang
SiC/Si3N4 composite nanofibers with in situ embedded graphite, which show highly efficient electromagnetic (EM) wave absorption performance in gigahertz frequency, were prepared by electrospinning with subsequent polymer pyrolysis and annealing. By means of incorporating graphite and Si3N4 into SiC , the EM wave absorption properties of the nanofibers were improved. The relationship among processing, fibers microstructure and their superior EM absorption performance were systematically investigated. The EM wave absorption capability, effective absorption bandwidth (EAB) of nanofibers can be simply controlled by adjusting annealing atmosphere and temperature...
August 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28773966/comparisons-of-damage-evolution-between-2d-c-sic-and-sic-sic-ceramic-matrix-composites-under-tension-tension-cyclic-fatigue-loading-at-room-and-elevated-temperatures
#2
Longbiao Li
In this paper, comparisons of damage evolution between 2D C/SiC and SiC/SiC ceramic-matrix composites (CMCs) under tension-tension cyclic fatigue loading at room and elevated temperatures have been investigated. Fatigue hysteresis loops models considering multiple matrix cracking modes in 2D CMCs have been developed based on the damage mechanism of fiber sliding relative to the matrix in the interface debonded region. The relationships between the fatigue hysteresis loops, fatigue hysteresis dissipated energy, fatigue peak stress, matrix multiple cracking modes, and interface shear stress have been established...
October 19, 2016: Materials
https://www.readbyqxmd.com/read/28773908/characteristics-of-ceramic-fiber-modified-asphalt-mortar
#3
Jiuming Wan, Shaopeng Wu, Yue Xiao, Quantao Liu, Erik Schlangen
Ceramic fiber, with a major composition of Al₂O₃ and SiO₂, has advantages of stability at relatively high temperature, big specific surface area and resistance to external mechanical vibration. It has the potential contribution of improving the rutting resistance and temperature sensitivity of modified asphalt binder by proper modification design. In this research, ceramic fiber was introduced into both pen 60/80 and pen 80/100 asphalt binder by different weight ratios. An asphalt penetration test, softening point test, ductility test and dynamic viscoelastic behavior were conducted to characterize and predict the ceramic fiber modified asphalt mortar (CFAM)...
September 21, 2016: Materials
https://www.readbyqxmd.com/read/28772723/toughening-mechanisms-in-nanolayered-max-phase-ceramics-a-review
#4
REVIEW
Xinhua Chen, Guoping Bei
Advanced engineering and functional ceramics are sensitive to damage cracks, which delay the wide applications of these materials in various fields. Ceramic composites with enhanced fracture toughness may trigger a paradigm for design and application of the brittle components. This paper reviews the toughening mechanisms for the nanolayered MAX phase ceramics. The main toughening mechanisms for these ternary compounds were controlled by particle toughening, phase-transformation toughening and fiber-reinforced toughening, as well as texture toughening...
March 30, 2017: Materials
https://www.readbyqxmd.com/read/28772544/synergistic-effects-of-stress-rupture-and-cyclic-loading-on-strain-response-of-fiber-reinforced-ceramic-matrix-composites-at-elevated-temperature-in-oxidizing-atmosphere
#5
Longbiao Li
In this paper, the synergistic effects of stress rupture and cyclic loading on the strain response of fiber-reinforced ceramic-matrix composites (CMCs) at elevated temperature in air have been investigated. The stress-strain relationships considering interface wear and interface oxidation in the interface debonded region under stress rupture and cyclic loading have been developed to establish the relationship between the peak strain, the interface debonded length, the interface oxidation length and the interface slip lengths...
February 15, 2017: Materials
https://www.readbyqxmd.com/read/28772389/optically-clear-and-resilient-free-form-%C3%A2%C2%B5-optics-3d-printed-via-ultrafast-laser-lithography
#6
Linas Jonušauskas, Darius Gailevičius, Lina Mikoliūnaitė, Danas Sakalauskas, Simas Šakirzanovas, Saulius Juodkazis, Mangirdas Malinauskas
We introduce optically clear and resilient free-form micro-optical components of pure (non-photosensitized) organic-inorganic SZ2080 material made by femtosecond 3D laser lithography (3DLL). This is advantageous for rapid printing of 3D micro-/nano-optics, including their integration directly onto optical fibers. A systematic study of the fabrication peculiarities and quality of resultant structures is performed. Comparison of microlens resiliency to continuous wave (CW) and femtosecond pulsed exposure is determined...
January 2, 2017: Materials
https://www.readbyqxmd.com/read/28766145/in-vitro-genotoxicity-of-asbestos-substitutes-induced-by-coupled-stimulation-of-dissolved-high-valence-ions-and-oxide-radicals
#7
Tingting Huo, Faqin Dong, Jianjun Deng, Qingbi Zhang, Wei Ye, Wei Zhang, Pingping Wang, Dongping Sun
The wide use of asbestos and its substitutes has given rise to studies on their possible harmful effects on human health and environment. However, their toxic effects remain unclear. The present study was aimed to disclose the coupled effects of dissolved high-valence ions and oxide radicals using the in vitro cytotoxicity and genotoxicity of chrysotile (CA), nano-SiO2 (NS), ceramic fiber (CF), glass fiber (GF), and rock wool (RW) on Chinese hamster lung cells V79. All samples induced cell mortality correlated well with the chemical SiO2 content of asbestos substitutes and the amount of dissolved Si...
August 1, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28756658/polymers-for-3d-printing-and-customized-additive-manufacturing
#8
Samuel Clark Ligon, Robert Liska, Jürgen Stampfl, Matthias Gurr, Rolf Mülhaupt
Additive manufacturing (AM) alias 3D printing translates computer-aided design (CAD) virtual 3D models into physical objects. By digital slicing of CAD, 3D scan, or tomography data, AM builds objects layer by layer without the need for molds or machining. AM enables decentralized fabrication of customized objects on demand by exploiting digital information storage and retrieval via the Internet. The ongoing transition from rapid prototyping to rapid manufacturing prompts new challenges for mechanical engineers and materials scientists alike...
August 9, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28755493/osteoinductive-porous-biphasic-calcium-phosphate-ceramic-as-an-alternative-to-autogenous-bone-grafting-in-the-treatment-of-mandibular-bone-critical-size-defects
#9
Paula Sanches Santos, Tania Mary Cestari, Jéssica Botto Paulin, Renato Martins, Caroline Andrade Rocha, Ricardo Vinícius Nunes Arantes, Bruna Carolina Costa, Cássio Morilla Dos Santos, Gerson Francisco Assis, Rumio Taga
The bone-induction capacity of a porous biphasic calcium phosphate (pBCP) using heterotopic implantation in mouse (mHI-model) and its efficacy as substitute for autograft in mandibular critical-size defect in rabbit (rabMCSD-model) was investigated. In mHI-model, pBCP was implanted into the thigh muscles and bone formation was histomorphometrically and immunohistochemically evaluated. In rabMCSD-model, 13 mm bone defects were treated with pBCP or autograft and bone repair comparatively evaluated by radiographic and histomorphometric methods...
July 29, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28735790/patient-specific-finite-element-analysis-of-fiber-post-and-ferrule-design
#10
Monise de Paula Rodrigues, Priscilla Barbosa Ferreira Soares, Andréa Dollores Correia Miranda Valdivia, Roberto Sales Pessoa, Crisnicaw Veríssimo, Antheunis Versluis, Carlos José Soares
INTRODUCTION: A ferrule on anterior endodontic-treated teeth has been evaluated using clinical trials, in vitro tests, and finite element analysis (FEA). The patient-specific FEA with a nonuniform ferrule and nonlinear contact biting load associated with clinical validation can be used to predict failure. METHODS: A patient was selected with both maxillary central incisors with different ferrule designs who received endodontic treatment and restoration using a fiber post, composite core, and computer aided design and computer aided manufacturing lithium disilicate ceramic crowns...
July 20, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28731208/super-strong-super-stiff-macrofibers-with-aligned-long-bacterial-cellulose-nanofibers
#11
Sha Wang, Feng Jiang, Xu Xu, Yudi Kuang, Kun Fu, Emily Hitz, Liangbing Hu
With their impressive properties such as remarkable unit tensile strength, modulus, and resistance to heat, flame, and chemical agents that normally degrade conventional macrofibers, high-performance macrofibers are now widely used in various fields including aerospace, biomedical, civil engineering, construction, protective apparel, geotextile, and electronic areas. Those macrofibers with a diameter of tens to hundreds of micrometers are typically derived from polymers, gel spun fibers, modified carbon fibers, carbon-nanotube fibers, ceramic fibers, and synthetic vitreous fibers...
July 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28713120/sealing-ability-of-esthetic-post-and-core-systems
#12
Thamer Almohareb
AIM: To review the literature on the sealing ability of esthetic post systems with different cementation techniques. BACKGROUND: An important factor for successful root canal treatment is the development of a coronal seal to the treated root canal system. Review result: The current literature describes promising results using fiber posts with a dual-cure, self-etch resin cement system. However, none of the published results describe a post system or cementation technique that achieved a homogeneous and tight coronal seal...
July 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28680547/fracture-resistances-of-zirconia-cast-ni-cr-and-fiber-glass-composite-posts-under-all-ceramic-crowns-in-endodontically-treated-premolars
#13
Sareh Habibzadeh, Hamid Reza Rajati, Habib Hajmiragha, Shima Esmailzadeh, Mohamadjavad Kharazifard
PURPOSE: The aim of the present study was to evaluate the fracture resistances of zirconia, cast nickel-chromium alloy (Ni-Cr), and fiber-composite post systems under all-ceramic crowns in endodontically treated mandibular first premolars. MATERIALS AND METHODS: A total of 36 extracted human mandibular premolars were selected, subjected to standard endodontic treatment, and divided into three groups (n=12) as follows: cast Ni-Cr post-and-core, one-piece custom-milled zirconia post-and-core, and prefabricated fiber-glass post with composite resin core...
June 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28663858/infrared-radiative-properties-and-thermal-modeling-of-ceramic-embedded-textile-fabrics
#14
David M Anderson, John R Fessler, Matthew A Pooley, Scott Seidel, Michael R Hamblin, Haskell W Beckham, James F Brennan
The infrared optical properties of textiles are of great importance in numerous applications, including infrared therapy and body thermoregulation. Tuning the spectral response of fabrics by the engineering of composite textile materials can produce fabrics targeted for use in these applications. We present spectroscopic data for engineered polyester fabric containing varying amounts of ceramic microparticles within the fiber core and report a spectrally-dependent shift in infrared reflectance, transmittance and absorptance...
March 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28639660/a-flexible-robust-and-antifouling-asymmetric-membrane-based-on-ultra-long-ceramic-polymeric-fibers-for-high-efficiency-separation-of-oil-water-emulsions
#15
Kui Wang, Wubulikasimu Yiming, Jayaprakash Saththasivam, Zhaoyang Liu
Polymeric and ceramic asymmetric membranes have dominated commercial membranes for water treatment. However, polymeric membranes are prone to becoming fouled, while ceramic membranes are mechanically fragile. Here, we report a novel concept to develop asymmetric membranes based on ultra-long ceramic/polymeric fibers, with the combined merits of good mechanical stability, excellent fouling resistance and high oil/water selectivity, in order to meet the stringent requirements for practical oil/water separation...
July 6, 2017: Nanoscale
https://www.readbyqxmd.com/read/28619003/hydroxyapatite-as-a-nanomaterial-for-advanced-tissue-engineering-and-drug-therapy
#16
Juha Tuukkanen, Miho Nakamura
Hydroxyapatite (HAp) is a complicated ceramic material that varies between the way it appears in biological systems and how it is synthesized as various calcium phosphates. HAp varies in chemical composition of substituting atoms, crystallinity, grain size and electrical polarization. HAp can form solid to macro-, micro- and nanoporous structures. Also, particulate HAp can have highly porous structure. HAp can be used as coatings for metal implants in thicknesses from hundreds of microns down to hundreds of nanometers...
June 15, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28603415/electroactive-batio3-nanoparticle-functionalized-fibrous-scaffolds-enhance-osteogenic-differentiation-of-mesenchymal-stem-cells
#17
Yiping Li, Xiaohan Dai, Yunyang Bai, Yun Liu, Yuehong Wang, Ousheng Liu, Fei Yan, Zhangui Tang, Xuehui Zhang, Xuliang Deng
It has been proven that the surface topographic cues of fiber arrangement can induce osteogenic differentiation of mesenchymal stem cells. However, this effect alone is weak and insufficient to meet the needs of regenerative medicine. In this work, electroactivity concept was introduced to enhance the osteoinductivity of fibrous scaffolds. The randomly oriented and aligned electroactive fibrous scaffolds of poly-(l-lactic acid) (PLLA) with incorporation of ferroelectric ceramic BaTiO3 (BTO) nanoparticles (NPs) were fabricated by electrospinning...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28560471/impact-of-laser-fiber-tip-cleavage-on-power-output-for-ureteroscopy-and-stone-treatment
#18
M Haddad, E Emiliani, Y Rouchausse, F Coste, L Berthe, S Doizi, S Buttice, B Somani, O Traxer
PURPOSE: Holmium:YAG laser is the most used laser for urolithiasis. Generally, we use metallic scissors to cut the fiber tip to restore its effectiveness. Many cleaving methods have been described to avoid fiber damage and to restore its greatest power to the fiber. There is a lack of information regarding which cleaving method should be used and its effect on the fiber. In order to compare these effects, we studied different cleavage methods in terms of power output and its effects on the fiber...
May 30, 2017: World Journal of Urology
https://www.readbyqxmd.com/read/28531647/multifunctional-plla-ceramic-fiber-membranes-for-bone-regeneration-applications
#19
Daniel Santos, Dina M Silva, Pedro S Gomes, Maria H Fernandes, José D Santos, Vitor Sencadas
A novel method to process electrospun poly(l-lactic acid) (PLLA) membranes incorporating glass reinforced hydroxyapatite granules (gHA) interspacially between the polymeric fibers is reported, thus increasing the surface area for cellular interactions. gHA granules (≤150μm) electrospun together with the polymer solution, lead to an average fiber diameter of 550±150nm for pristine PLLA and 440±170nm for the composite samples. An increase of the overall porosity was observed, from 79±3% for the PLLA up to 88±5% for the hybrid samples, keeping material's wettability and mechanical properties...
May 12, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28496207/selective-doping-of-ni-2-in-highly-transparent-glass-ceramics-containing-nano-spinels-znga2o4-and-zn1-x-ga2-2x-ge-x-o4-for-broadband-near-infrared-fiber-amplifiers
#20
Zhigang Gao, Yinyao Liu, Jing Ren, Zaijin Fang, Xiaosong Lu, Elfed Lewis, Gerald Farrell, Jun Yang, Pengfei Wang
Selective doping of Ni(2+) in octahedral sites provided by nanocrystals embedded in glass-ceramics (GCs) is crucial to the enhancement of broadband near-infrared (NIR) emission. In this work, a NIR emission with a full-width-at-half-maximum (FWHM) of 288 nm is first reported from ZnGa2O4: Ni(2+) nano-spinels embedded GCs with excellent transparency. A comparison is made of the NIR luminescence properties of Ni(2+) doped GCs containing ZnGa2O4, germanium-substituted ZnGa2O4 nano-spinels (Zn1+x Ga2-2x Ge x O4), and Zn2GeO4/Li2Ge4O9 composite nanocrystals that are free of Ga(3+)...
May 11, 2017: Scientific Reports
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