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https://www.readbyqxmd.com/read/29725492/biodegradable-magnesium-alloys-developed-as-bone-repair-materials-a-review
#1
REVIEW
Chen Liu, Zheng Ren, Yongdong Xu, Song Pang, Xinbing Zhao, Ying Zhao
Bone repair materials are rapidly becoming a hot topic in the field of biomedical materials due to being an important means of repairing human bony deficiencies and replacing hard tissue. Magnesium (Mg) alloys are potentially biocompatible, osteoconductive, and biodegradable metallic materials that can be used in bone repair due to their in situ degradation in the body, mechanical properties similar to those of bones, and ability to positively stimulate the formation of new bones. However, rapid degradation of these materials in physiological environments may lead to gas cavities, hemolysis, and osteolysis and thus, hinder their clinical orthopedic applications...
2018: Scanning
https://www.readbyqxmd.com/read/29725491/surface-morphology-study-of-chemical-vapor-transport-of-zno-crystals
#2
Long Fan, Jia Li, Dawei Yan, Liping Peng, Tao Jiang, Xueming Wang, Weidong Wu
A chemical vapor transport (CVT) method was implemented to grow bulk ZnO crystals. X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), and optical microscope (OM) studies were carried out to characterize the surface properties of the grown crystal. The XRD result indicated the exposed solid-vapor interface of the as-grown crystal was composed of (0001) and [Formula: see text] faces. Using SEM and OM, we observed small hexagonal pyramids and microstructures formed of crosslines on the as-grown crystal and found hexagonal thermal etching pits on the surfaces of seed crystals...
2018: Scanning
https://www.readbyqxmd.com/read/29721128/structural-and-kinetic-hydrogen-sorption-properties-of-zr-0-8-ti-0-2-co-alloy-prepared-by-ball-milling
#3
Hui He, Huaqin Kou, Wenhua Luo, Tao Tang, Zhiyong Huang, Ge Sang, Guanghui Zhang, Jingwen Ba, Meng Liu
The effects of ball milling on the hydrogen sorption kinetics and microstructure of Zr0.8 Ti0.2 Co have been systematically studied. Kinetic measurements show that the hydrogenation rate and amount of Zr0.8 Ti0.2 Co decrease with increasing the ball milling time. However, the dehydrogenation rate accelerates as the ball milling time increases. Meanwhile, the disproportionation of Zr0.8 Ti0.2 Co speeds up after ball milling and the disproportionation kinetics is clearly inclined to be linear with time at 500°C...
2018: Scanning
https://www.readbyqxmd.com/read/29692874/fast-specimen-boundary-tracking-and-local-imaging-with-scanning-probe-microscopy
#4
Yongbing Wen, Jianmin Song, Xinjian Fan, Danish Hussain, Hao Zhang, Hui Xie
An efficient and adaptive boundary tracking method is developed to confine area of interest for high-efficiency local scanning. By using a boundary point determination criterion, the scanning tip is steered with a sinusoidal waveform while estimating azimuth angle and radius ratio of each boundary point to accurately track the boundary of targets. A local scan region and path are subsequently planned based on the prior knowledge of boundary tracking to reduce the scan time. Boundary tracking and local scanning methods have great potential not only for fast dimension measurement but also for sample surface topography and physical characterization, with only scanning region of interest...
2018: Scanning
https://www.readbyqxmd.com/read/29682145/preparation-and-anodizing-of-sicp-al-composites-with-relatively-high-fraction-of-sicp
#5
Bin Wang, Shengguan Qu, Xiaoqiang Li
By properly proportioned SiC particles with different sizes and using squeeze infiltration process, SiCp/Al composites with high volume fraction of SiC content (Vp = 60.0%, 61.2%, 63.5%, 67.4%, and 68.0%) were achieved for optical application. The flexural strength of the prepared SiCp /Al composites was higher than 483 MPa and the elastic modulus was increased from 174.2 to 206.2 GPa. With an increase in SiC volume fraction, the flexural strength and Poisson's ratio decreased with the increase in elastic modulus...
2018: Scanning
https://www.readbyqxmd.com/read/29675119/microscopic-features-of-fractured-fragment-of-nickel-titanium-endodontic-instruments-by-two-different-modes-of-torsional-loading
#6
Ibrahim H Abu-Tahun, Sang Won Kwak, Jung-Hong Ha, Hyeon-Cheol Kim
This study compared the microscopic features of the fractured endodontic nickel-titanium (NiTi) rotary instruments by two different torsional loadings: repetitive torsional loading (RTL) and single torsional loading (STL) based on the International Organization for Standardization (ISO). ProTaper Next, HyFlex EDM, and V-Taper 2 were compared in this study. In the STL method, the torsional load was applied after fixing the 3 mm tip of the file, by continuous clockwise rotation (2 rpm) until fracture. In the RTL method, a preset rotational loading (0...
2018: Scanning
https://www.readbyqxmd.com/read/29675118/effect-of-the-different-high-volume-fraction-of-sic-particles-on-the-junction-of-bismuthate-glass-sic-p-al-composite
#7
Bin Wang, Shengguan Qu, Xiaoqiang Li
The in-house developed bismuthate glass and the SiCp /Al composites with different volume fractions of SiC particles (namely, 60 vol.%, 65 vol.%, 70 vol.%, and 75 vol.%) were jointed by vacuum hot-pressing process. The novel material can be used for the space mirror. The SiCp is an abbreviation for SiC particle. Firstly, the SiCp /Al composites with different vol.% of SiC particle were manufactured by using infiltration process. In order to obtain a stable bonding interface, the preoxide layers were fabricated on the surfaces of these composites for reacting with the bismuthate glass...
2018: Scanning
https://www.readbyqxmd.com/read/29643971/scanning-electron-microscopic-studies-of-microwave-sintered-al-sic-nanocomposites-and-their-properties
#8
M A Himyan, M Penchal Reddy, F Ubaid, R A Shakoor, A M A Mohamed
Al-metal matrix composites (AMMCs) reinforced with diverse volume fraction of SiC nanoparticles were synthesized using microwave sintering process. The effects of the reinforcing SiC particles on physical, microstructure, mechanical, and electrical properties were studied. The phase, microstructural, and surface analyses of the composites were systematically conducted using X-ray diffraction (XRD), scanning electron microscope (SEM), and surface profilometer techniques, respectively. The microstructural examination revealed the homogeneous distribution of SiC particles in the Al matrix...
2018: Scanning
https://www.readbyqxmd.com/read/29643970/in-vitro-degradation-behaviors-of-manganese-calcium-phosphate-coatings-on-an-mg-ca-zn-alloy
#9
Yichang Su, Yingchao Su, Wei Zai, Guangyu Li, Cuie Wen
In order to decrease the degradation rate of magnesium (Mg) alloys for the potential orthopedic applications, manganese-calcium phosphate coatings were prepared on an Mg-Ca-Zn alloy in calcium phosphating solutions with different addition of Mn2+ . Influence of Mn content on degradation behaviors of phosphate coatings in the simulated body fluid was investigated to obtain the optimum coating. With the increasing Mn addition, the corrosion resistance of the manganese-calcium phosphate coatings was gradually improved...
2018: Scanning
https://www.readbyqxmd.com/read/29619143/synthesis-and-performance-evaluation-of-pulse-electrodeposited-ni-aln-nanocomposite-coatings
#10
Kamran Ali, Sivaprasad Narayana, R A Shakoor, Paul C Okonkwo, Moinuddin M Yusuf, Abdullah Alashraf, Ramazan Kahraman
This research work presents the microscopic analysis of pulse electrodeposited Ni-AlN nanocomposite coatings using SEM and AFM techniques and their performance evaluation (mechanical and electrochemical) by employing nanoindentation and electrochemical methods. The Ni-AlN nanocomposite coatings were developed by pulse electrodeposition. The nickel matrix was reinforced with various amounts of AlN nanoparticles (3, 6, and 9 g/L) to develop Ni-AlN nanocomposite coatings. The effect of reinforcement concentration on structure, surface morphology, and mechanical and anticorrosion properties was studied...
2018: Scanning
https://www.readbyqxmd.com/read/29576841/different-setting-conditions-affect-surface-characteristics-and-microhardness-of-calcium-silicate-based-sealers
#11
Dong-Kyu Yang, Sunil Kim, Jeong-Won Park, Euiseong Kim, Su-Jung Shin
Objective: To investigate the effect of different setting conditions on surface microhardness and setting properties of calcium silicate-based sealers. Methods: Three sealers, EndoSequence Bioceramic (BC; Brasseler USA, Savannah, GA, USA), Endoseal MTA (ES; Maruchi, Wonju, Korea), and Well-Root ST (WR; Vericom, Chuncheon, Korea), were compared. Specimens were exposed to either butyric acid (pH 5.4) or phosphate-buffered saline (PBS [pH 7.4]) for 48 h and stored at 100% humidity for 12 days...
2018: Scanning
https://www.readbyqxmd.com/read/29552269/influence-of-cu-content-on-the-microstructure-and-mechanical-properties-of-cr-cu-n-coatings
#12
Ji Cheng Ding, Teng Fei Zhang, Zhi Xin Wan, Hai Juan Mei, Myung Chang Kang, Qi Min Wang, Kwang Ho Kim
The Cr-Cu-N coatings with various Cu contents (0-25.18 (±0.17) at.%) were deposited on Si wafer and stainless steel (SUS 304) substrates in reactive Ar+N2 gas mixture by a hybrid coating system combining pulsed DC and RF magnetron sputtering techniques. The influence of Cu content on the coating composition, microstructure, and mechanical properties was investigated. The microstructure of the coatings was significantly altered by the introduction of Cu. The deposited coatings exhibit solid solution structure with different compositions in all of the samples...
2018: Scanning
https://www.readbyqxmd.com/read/29541283/the-role-of-scanning-electron-microscopy-in-the-direct-diagnosis-of-onychomycosis
#13
Xueping Yue, Aiping Wang, Qing Li
Purpose: The purpose of this study was to evaluate the role of scanning electron microscopy (SEM) in the direct diagnosis of suspected onychomycosis with negative mycological test results. Methods: Outpatients diagnosed with suspected onychomycosis with negative mycological test results, including direct microscopic examination with 10% potassium hydroxide (KOH) and fungal culture, on 3 separate occasions were recruited. A small piece of infected nail was obtained for SEM examination...
2018: Scanning
https://www.readbyqxmd.com/read/29507649/magnetization-analysis-by-spin-polarized-scanning-electron-microscopy
#14
REVIEW
Teruo Kohashi
Spin-polarized scanning electron microscopy (spin SEM) is a method for observing magnetic-domain structures by detecting the spin polarization of secondary electrons. It has several unique abilities such as detection of full magnetization orientation and high-spatial-resolution measurement. Several spin-SEM experiments have demonstrated that it is a promising method for studying various types of magnetic materials and devices. This review paper presents several spin-SEM observations to demonstrate the capability and potential of spin SEM...
2018: Scanning
https://www.readbyqxmd.com/read/29484086/the-ferroelectric-domain-structures-induced-by-electron-beam-scanning-in-lithium-niobate
#15
Evgeny Vlasov, Dmitry Chezganov, Maria Chuvakova, Vladimir Ya Shur
Ferroelectric domain structure has been formed under the action of electron beam scanning in congruent lithium niobate single crystal covered by surface dielectric layer. The obtained types of the domain patterns have been considered as subsequent stages of domain structure evolution. The dependence on irradiated charge density of domain density, length, and period of domain rays and stripe domain width was used for characterization of the domain structure evolution. The threshold irradiated charge density necessary for the formation of solid stripe domain has been revealed...
2018: Scanning
https://www.readbyqxmd.com/read/29445427/a-novel-open-framework-cu-ge-based-chalcogenide-anode-material-for-sodium-ion-battery
#16
Quan Sun, Lin Fu, Chaoqun Shang
Open-framework chalcogenides are potential electrode materials for sodium-ion batteries (SIBs) due to their architectures with fast-ion conductivity. Herein, we report on the successful synthesis of open-framework Cu-Ge-based chalcogenides [Cu8 Ge6 Se19 ](C5 H12 N)6 (CGSe) and the research of their energy storage application as SIB anodes for the first time. As a result, the CGSe anode exhibited good electrochemical performances such as high reversible capacity (463.3 mAh g-1 ), excellent rate performance, and considerable cycling stability...
2017: Scanning
https://www.readbyqxmd.com/read/29430276/corrosion-properties-of-34crmo4-steel-modified-by-shot-peening
#17
Qiang Zheng, Kejian Li, Xueguo Yin, Bingbing Li, Chunhong Li, Yilong Ma, Jianchun Sun, Dengming Chen
A nanocrystalline layer was prepared on the surface of 34CrMo4 steel by time controlling shot peening (SP, i.e., 1, 5, 10, and 20 minutes). Field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) analysis, and transmission electron microscope (TEM) were applied to analyze the surface, cross-sections, and grain size of the specimens before and after SP. The electrochemical corrosion behavior was used to simulate a liquid under the oil and gas wells environment. It was characterized by the potentiodynamic polarization test and electrochemical impedance spectroscopy (EIS)...
2017: Scanning
https://www.readbyqxmd.com/read/29422981/axisymmetric-contact-problem-for-a-flattened-cell-contributions-of-substrate-effect-and-cell-thickness-to-the-determination-of-viscoelastic-properties-by-using-afm-indentation
#18
Xinyao Zhu, Lanjiao Liu, Zuobin Wang, X Liu
Nanoindentation technology has proven to be an effective method to investigate the viscoelastic properties of biological cells. The experimental data obtained by nanoindentation are frequently interpreted by Hertz contact model. However, in order to validate Hertz contact model, some studies assume that cells have infinite thickness which does not necessarily represent the real situation. In this study, a rigorous contact model based upon linear elasticity is developed for the interpretation of indentation tests of flattened cells...
2017: Scanning
https://www.readbyqxmd.com/read/29422980/facile-synthesis-of-indium-sulfide-flexible-electrospun-carbon-nanofiber-for-enhanced-photocatalytic-efficiency-and-its-application
#19
Liu Han, Haohao Dong, Dong Mao, Baolv Hua, Qinyu Li, Dong Fang
Heterojunction system has been proved as one of the best architectures for photocatalyst owing to extending specific surface area, expanding spectral response range, and increasing photoinduced charges generation, separation, and transmission, which can provide better light absorption range and higher reaction site. In this paper, Indium Sulfide/Flexible Electrospun Carbon Nanofiber (In2 S3 /CNF) heterogeneous systems were synthesized by a facile one-pot hydrothermal method. The results from characterizations of SEM, TEM, XRD, Raman, and UV-visible diffuse reflectance spectroscopy displayed that flower-like In2 S3 was deposited on the hair-like CNF template, forming a one-dimensional nanofibrous network heterojunction photocatalyst...
2017: Scanning
https://www.readbyqxmd.com/read/29410714/extracting-cross-sectional-clinical-images-based-on-their-principal-axes-of-inertia
#20
Yuzhou Fan, Liangping Luo, Marija Djuric, Zhiyu Li, Djordje Antonijevic, Petar Milenkovic, Yueyang Sun, Ruining Li, Yifang Fan
Cross-sectional imaging is considered the gold standard in diagnosing a range of diseases. However, despite its widespread use in clinical practice and research, no widely accepted method is available to reliably match cross-sectional planes in several consecutive scans. This deficiency can impede comparison between cross-sectional images and ultimately lead to misdiagnosis. Here, we propose and demonstrate a method for finding the same imaging plane in images obtained during separate scanning sessions. Our method is based on the reconstruction of a "virtual organ" from which arbitrary cross-sectional images can be extracted, independent of the axis orientation in the original scan or cut; the key is to establish unique body coordinates of the organ from its principal axes of inertia...
2017: Scanning
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