keyword
MENU ▼
Read by QxMD icon Read
search

Ceramics

keyword
https://www.readbyqxmd.com/read/29355718/trivalent-chromium-incorporated-in-a-crystalline-calcium-phosphate-matrix-accelerates-materials-degradation-and-bone-formation-in-vivo
#1
Barbe Rentsch, Anne Bernhardt, Anja Henß, Seemun Ray, Claudia Rentsch, Martha Schamel, Uwe Gbureck, Michael Gelinsky, Stefan Rammelt, Anja Lode
Remodeling of calcium phosphate bone cements is a crucial prerequisite for their application in the treatment of large bone defects. In the present study trivalent chromium ions were incorporated into a brushite forming calcium phosphate cement in two concentrations (10 and 50 mmol/mol β-tricalcium phosphate) and implanted into a femoral defect in rats for 3 and 6 month, non-modified brushite was used as reference. Based on our previous in vitro findings indicating both an enhanced osteoclastic activity and cytocompatibility towards osteoprogenitor cells we hypothesized a higher in vivo remodeling rate of the Cr3+ doped cements compared to the reference...
January 17, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29354847/dopamine-functionalization-of-batio3-an-effective-strategy-for-the-enhancement-of-electrical-magnetoelectric-and-thermal-properties-of-batio3-pvdf-trfe-nanocomposites
#2
Anshida Mayeen, Kala M S, M S Jayalakshmy, Sabu Thomas, Didier Rouxel, Jacob Philip, R N Bhowmik, Nandakumar Kalarikkal
Electro-active polymer-ceramic composite systems are emerging materials in the fields of nanoelectronic, microelectromechanical and macroelectronic device applications. Still more precise and concise research studies have yet to come in the areas of energy storage, harvesting, energy conversion, etc. In line with this, we have synthesized and analyzed PVDF-TrFE based nanocomposites of both functionalized and non-functionalized BaTiO3 (BTO). All the samples were prepared as free standing films by employing a solvent cast method...
January 22, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29350726/3d-assembly-of-ti3c2-mxene-directed-by-water-oil-interfaces
#3
Renji Bian, Ruizhi Lin, Guilin Wang, Gang Lu, Weiqiang Zhi, Shanglin Xiang, Tingwei Wang, Paul S Clegg, Dongyu Cai, Wei Huang
MXene is an emerging class of 2D materials exfoliated from ternary carbide and nitride ceramics. The exfoliation process, which is an acid etching approach, functionalizes the MXene surface with -OH, -O and -F groups. These functional groups offer significant opportunities for tuning the colloidal properties of the MXene nanoblocks; importantly, this tunability points the way towards a facile route for assembling these nanoblocks into 3D architectures that are in demand for many applications. This route, presented for the first time here, uses water/oil interfaces for assembling Ti3C2-MXene in 3D architectures...
January 19, 2018: Nanoscale
https://www.readbyqxmd.com/read/29348633/contrasting-patterns-of-prehistoric-human-diet-and-subsistence-in-northernmost-europe
#4
Mirva Pääkkönen, Auli Bläuer, Bjørnar Olsen, Richard P Evershed, Henrik Asplund
Current archaeological evidence indicates the transition from hunting-fishing-gathering to agriculture in Northern Europe was a gradual process. This transition was especially complex in the prehistoric North Fennoscandian landscape where the high latitude posed a challenge to both domestic animal breeding and cereal cultivation. The conditions varied, the coastal dwellers had access to rich marine resources and enjoyed a milder climate due to the Gulf Stream, while those living in the inland Boreal forest zone faced longer and colder winters and less diversity in animal and plant resources...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29348234/chiromagnetic-nanoparticles-and-gels
#5
Jihyeon Yeom, Uallisson S Santos, Mahshid Chekini, Minjeong Cha, André F de Moura, Nicholas A Kotov
Chiral inorganic nanostructures have high circular dichroism, but real-time control of their optical activity has so far been achieved only by irreversible chemical changes. Field modulation is a far more desirable path to chiroptical devices. We hypothesized that magnetic field modulation can be attained for chiral nanostructures with large contributions of the magnetic transition dipole moments to polarization rotation. We found that dispersions and gels of paramagnetic Co3O4 nanoparticles with chiral distortions of the crystal lattices exhibited chiroptical activity in the visible range that was 10 times as strong as that of nonparamagnetic nanoparticles of comparable size...
January 19, 2018: Science
https://www.readbyqxmd.com/read/29347885/preparation-of-affordable-and-multi-functional-clay-based-ceramic-filter-matrix-for-treatment-of-drinking-water
#6
H Puttaiah Shivaraju, Henok Egumbo, P Madhusudan, K M Anil Kumar, G Midhun
In the present study, affordable clay-based ceramic filters with multi-functional properties were prepared using low-cost and active ingredients. The characterization results of as-prepared materials clearly revealed well crystallinity, structural elucidation, extensive porosity, higher surface area, higher stability, and durability which apparently enhance the treatment efficiency. The filtration rates of ceramic filter were evaluated under gravity and the results obtained were compared with typical gravity slow sand filter...
January 18, 2018: Environmental Technology
https://www.readbyqxmd.com/read/29347851/the-era-of-biofunctional-biomaterials-in-orthopedics-what-does-the-future-hold
#7
Mubashar Rehman, Asadullah Madni, Thomas J Webster
Titanium-based materials do not fulfill all the requirements of orthopedic implants due to a mismatch in mechanical properties with bone which are prone to change during the course of bone growth. Biofunctional biomaterials are a new class of materials that show bioactivity and adaptability at any stage of bone growth. Areas covered: Different biofunctional biomaterials have evolved over time that can enhance calcium phosphate (CaP) precipitation, stimulate osteogenic differentiation, and can control osteoblast gene expression...
January 18, 2018: Expert Review of Medical Devices
https://www.readbyqxmd.com/read/29347327/effective-dielectric-response-of-dispersions-of-graded-particles
#8
M Ya Sushko
Based upon our compact group approach and the Hashin-Shtrikman variational theorem, we propose a solution, which effectively incorporates many-particle effects in concentrated systems, to the problem of the effective quasistatic permittivity of dispersions of graded dielectric particles. After the theory is shown to recover existing analytical results and simulation data for dispersions of hard dielectric spheres with power-law permittivity profiles, we use it to describe the effective dielectric response of nonconducting polymer-ceramic composites modeled as dispersions of dielectric core-shell particles...
December 2017: Physical Review. E
https://www.readbyqxmd.com/read/29346725/rapid-chemical-vapor-infiltration-of-silicon-carbide-minicomposites-at-atmospheric-pressure
#9
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/29346723/shear-induced-brittle-failure-along-grain-boundaries-in-boron-carbide
#10
Xiaokun Yang, Shawn P Coleman, Jerry Lasalvia, William A Goddard, Qi An
The roles of grain boundaries (GB) in mechanical properties have been examined extensively for metals and alloys; however, for covalent solids their roles in deformation response to applied stress are much less established. We consider here the unusual ceramic, boron carbide (B4C), which is very hard and lightweight but exhibits brittle impact behavior. We used quantum mechanics (QM) simulations to determine the mechanical response in the atomistic structures at GBs under pure shear and also with biaxial shear deformation that mimics indentation stress conditions...
January 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29346297/the-dynamic-performance-of-flexural-ultrasonic-transducers
#11
Andrew Feeney, Lei Kang, George Rowlands, Steve Dixon
Flexural ultrasonic transducers are principally used as proximity sensors and for industrial metrology. Their operation relies on a piezoelectric ceramic to generate a flexing of a metallic membrane, which delivers the ultrasound signal. The performance of flexural ultrasonic transducers has been largely limited to excitation through a short voltage burst signal at a designated mechanical resonance frequency. However, a steady-state amplitude response is not generated instantaneously in a flexural ultrasonic transducer from a drive excitation signal, and differences in the drive characteristics between transmitting and receiving transducers can affect the measured response...
January 18, 2018: Sensors
https://www.readbyqxmd.com/read/29342890/polymer-ceramic-composite-scaffolds-the-effect-of-hydroxyapatite-and-%C3%AE-tri-calcium-phosphate
#12
Boyang Huang, Guilherme Caetano, Cian Vyas, Jonny James Blaker, Carl Diver, Paulo Bártolo
The design of bioactive scaffolds with improved mechanical and biological properties is an important topic of research. This paper investigates the use of polymer-ceramic composite scaffolds for bone tissue engineering. Different ceramic materials (hydroxyapatite (HA) and β-tri-calcium phosphate (TCP)) were mixed with poly-ε-caprolactone (PCL). Scaffolds with different material compositions were produced using an extrusion-based additive manufacturing system. The produced scaffolds were physically and chemically assessed, considering mechanical, wettability, scanning electron microscopy and thermal gravimetric tests...
January 14, 2018: Materials
https://www.readbyqxmd.com/read/29342851/laser-machining-and-in-vitro-assessment-of-wollastonite-tricalcium-phosphate-eutectic-glasses-and-glass-ceramics
#13
Daniel Sola, Lorena Grima
Bioactivity and ingrowth of ceramic implants is commonly enhanced by a suitable interconnected porous network. In this work, the laser machining of CaSiO₃‒Ca₃(PO₄)₂ biocompatible eutectic glass-ceramics and glasses was studied. For this purpose, 300 µm diameter craters were machined by using pulsed laser radiation at 532 nm with a pulsewidth in the nanosecond range. Machined samples were soaked in simulated body fluid for 2 months to assess the formation of a hydroxyapatite layer on the surface of the laser machined areas...
January 13, 2018: Materials
https://www.readbyqxmd.com/read/29341858/respiratory-assessment-of-refractory-ceramic-fibers-in-a-heating-technician-population
#14
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/29340480/bone-repair-access-of-boneceramic%C3%A2-in-5-mm-defects-study-on-rat-calvaria
#15
André Luis da Silva Fabris, Leonardo Perez Faverani, Pedro Henrique Silva Gomes-Ferreira, Tárik Ocon Braga Polo, Joel Ferreira Santiago-Júnior, Roberta Okamoto
OBJECTIVE: The aim of this study was to evaluate the osteoconductive potential of BoneCeramic™ on bone healing in rat calvaria 5-mm defects. MATERIAL AND METHODS: A 5-mm calvaria bone defect was induced in three groups and the defect was not filled with biomaterial [Clot Group (CG)], autogenous bone (AG), or Bone Ceramic Group (BCG). Animals were euthanized after 14 or 28 days and the bone tissue within the central area of the bone defect was evaluated. Results were compared using ANOVA and Tukey test (p<0...
January 15, 2018: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/29338270/effect-of-calcium-on-the-microstructure-and-corrosion-behavior-of-microarc-oxidized-mg-xca-alloys
#16
Yaokun Pan, Chuanzhong Chen, Rui Feng, Hongwei Cui, Benkui Gong, Tingting Zheng, Yarou Ji
Magnesium alloys are potential biodegradable implants for biomedical applications, and calcium (Ca) is one kind of ideal element being examined for magnesium alloys and biodegradable ceramic coatings owing to its biocompatibility and mechanical suitability. In this study, microarc oxidation (MAO) coatings were prepared on Mg-xCa alloys to study the effect of Ca on the microstructure and corrosion resistance of Mg-xCa alloys and their surface MAO coatings. The electrochemical corrosion behavior was investigated using an electrochemical workstation, and the degradability and bioactivity were evaluated by soaking tests in simulated body fluid (SBF) solutions...
January 16, 2018: Biointerphases
https://www.readbyqxmd.com/read/29337879/microwave-backscatter-based-wireless-temperature-sensor-fabricated-by-an-alumina-backed-au-slot-radiation-patch
#17
Fei Lu, Haixing Wang, Yanjie Guo, Qiulin Tan, Wendong Zhang, Jijun Xiong
A wireless and passive temperature sensor operating up to 800 °C is proposed. The sensor is based on microwave backscatter RFID (radio frequency identification) technology. A thin-film planar structure and simple working principle make the sensor easy to operate under high temperature. In this paper, the proposed high temperature sensor was designed, fabricated, and characterized. Here the 99% alumina ceramic with a dimension of 40 mm × 40 mm × 1 mm was prepared in micromechanics for fabrication of the sensor substrate...
January 16, 2018: Sensors
https://www.readbyqxmd.com/read/29337645/conservative-approach-for-treatment-of-maxillary-lateral-incisor-agenesis-with-the-deciduous-tooth-retained-18-month-follow-up
#18
Cecm Lameira, S R Mestrener, Nip Pini, F M Salomão, A A Pesqueira, T C Fagundes
This case describes a female patient with agenesis of the maxillary right lateral incisor, with her permanent canine in its position and the deciduous canine retained. Additionally, she presented with a maxillary left peg lateral incisor. To solve her functional and esthetic complaints, a multidisciplinary approach involving perio-restorative procedures was proposed. Periodontal surgeries were performed to align the gingival contour, and the restorative approach utilized ceramic veneers. At the 18-month clinical and radiographic follow-up, the treatment outcome was stable, with maintenance of the clinical results achieved and without any sign of deciduous tooth resorption...
January 16, 2018: Operative Dentistry
https://www.readbyqxmd.com/read/29337644/performance-of-monolithic-and-veneered-zirconia-crowns-after-endodontic-treatment-and-different-repair-strategies
#19
A Scioscia, A Helfers, S Soliman, G Krastl, N U Zitzmann
OBJECTIVES: To investigate failure loads of monolithic and veneered all-ceramic crowns after root canal treatment and to analyze marginal integrity of repair fillings. METHODS AND MATERIALS: Seventy-two human molars were restored with monolithic (Zr-All) or veneered (Zr-Ven) zirconia crowns. Molars were assigned to six groups (n=12 per group) depending on restoration material, access type (no access cavity [control] or endodontic treatment [test]), and type of filling (one-step [1-st] or two-step [2-st])...
January 16, 2018: Operative Dentistry
https://www.readbyqxmd.com/read/29336858/are-ceramic-bearings-becoming-cost-effective-for-all-patients
#20
Steven M Kurtz, Edmund C Lau, Doruk Baykal, Susan M Odum, Bryan D Springer, Thomas K Fehring
BACKGROUND: The purpose of this study is to analyze whether the cost for ceramic-on-polyethylene (C-PE) and ceramic-on-ceramic (COC) bearings used in primary total hip arthroplasty (THA) was changing over time, and if the cost differential between ceramic bearings and metal-on-polyethylene (M-PE) bearings was approaching the previously published tipping point for cost-effectiveness of $325. METHODS: A total of 245,077 elderly Medicare patients (65+) who underwent primary THA between 2010 and 2015 were identified from the United States Medicare 100% national administrative hospital claims database...
December 21, 2017: Journal of Arthroplasty
keyword
keyword
11179
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"