scholarly journals Micro/nano-hierarchical structured TiO 2 coating on titanium by micro-arc oxidation enhances osteoblast adhesion and differentiation

2019 ◽  
Vol 6 (4) ◽  
pp. 182031 ◽  
Author(s):  
Xumeng Pan ◽  
Yada Li ◽  
Adil O. Abdullah ◽  
Weiqiang Wang ◽  
Min Qi ◽  
...  
Keyword(s):  
Dental Implants ◽  
Xrd Analysis ◽  
Cell Counting ◽  
Minor Amount ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mg63 Cells ◽  
Micro Arc Oxidation ◽  
Osteoblast Adhesion ◽  
A Minor

Nano-structured and micro/nano-hierarchical structured TiO 2 coatings were produced on polished titanium by the micro-arc oxidation (MAO) technique. This study was conducted to screen a suitable structured TiO 2 coating for osteoblast adhesion and differentiation in dental implants. The formulation was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and wettability testing. Adhesion, proliferation and osteogenic differentiation of MG63 cells were analysed by SEM, Cell Counting Kit-8 (CCK-8) and quantitative real-time PCR. The micro/nano-hierarchical structured TiO 2 coating with both slots and pores showed the best morphology and wettability. XRD analysis revealed that rutile predominated along with a minor amount of anatase in both TiO 2 coatings. Adhesion and extension of MG63 cells on the micro/nano-hierarchical structured TiO 2 coating were the most favourable. MG63 cells showed higher growth rates on the micro/nano-hierarchical structured TiO 2 coating at 1 and 3 days. Osteogenic-related gene expression was markedly increased in the micro/nano-hierarchical structured TiO 2 coating group compared with the polished titanium group at 7, 14 and 21 days. These results revealed the micro/nano-hierarchical structured TiO 2 coating as a promising surface modification and suitable biomaterial for use with dental implants.

Effect of Cao from Different Sources on the Nanostructured Cordierite

2011 ◽  
Vol 364 ◽  
pp. 368-371 ◽  
Author(s):  
Ibrahim Norfadhilah ◽  
Mohamad Hasmaliza ◽  
Zainal Arifin Ahmad ◽  
J. Banjuraizah
Keyword(s):  
Xrd Analysis ◽  
Oxide Material ◽  
X Ray Diffraction ◽  
Minor Phase ◽  
Major Phase ◽  
X Ray ◽  
Pure Oxide ◽  
Crystallite Sizes ◽  
A Minor ◽  
Different Sources

Cordierite was synthesized via glass-route using mineral and pure oxide material. Kaolin, talc, dolomite, magnesia, alumina, silica, and calcium oxide were mixed and melted. CaO from mineral and pure oxide was added in order to investigate the properties of each material in cordierite system. Sample was characterized using X-ray diffraction (XRD) analysis and dilatometer testing. The result showed that when 5wt% CaO from mineral (C5 Min) was added and sintered at 900°C, α-cordierite exist as major phase and anorthite as a minor phase. While for a sample consists of 5wt% CaO from pure oxide (C5 Ox), α-cordierite was present as major phases, µ-cordierite and anorthite as minor phases. Crystallite sizes of each material were in nanorange and crystallite size of C5 Ox was less than C5 Min.

La-Doped CaCu3Ti4O12 Ceramics Sintered in Argon Environment

2010 ◽  
Vol 173 ◽  
pp. 167-172
Author(s):  
N. Shafiza Afzan Sharif ◽  
Sabar Derita Hutagalung ◽  
Zainal A. Ahmad
Keyword(s):  
Single Phase ◽  
Xrd Analysis ◽  
Lattice Parameter ◽  
Lattice Expansion ◽  
X Ray Diffraction ◽  
X Ray ◽  
Group A ◽  
Cubic Structure ◽  
A Minor ◽  
La Doped

The properties of undoped and La-doped CaCu3Ti4O12 ceramics synthesized via solid state reaction under argon environment had been studied. It was found that La-doped CCTOs gave higher dielectric constant and lower dielectric loss than undoped CCTO. X-ray diffraction (XRD) analysis indicated that all of the sintered samples have single-phase cubic structure (space group ). A minor shifted was observed in the peak positions for La-doped samples, which are attributed to the lattice expansion. The lattice parameter obtained from XRD analysis is 7.348 Å for undoped CCTO and increases to 7.348 – 7.377 Å for La-doped CCTOs. The results proven that La ions have effectively substituted into the Ca site of CCTO.

High-permittivity microwave dielectric ceramics based on (1 - x)(Li1/2Nd1/2)TiO3–xCaTiO3

2015 ◽  
Vol 29 (10n11) ◽  
pp. 1540026 ◽  
Author(s):  
Weijun Zhang ◽  
Xingyu Chen ◽  
Aiqing Jia ◽  
Shuxin Bai
Keyword(s):  
Continuous Solid Solution ◽  
Secondary Phase ◽  
Xrd Analysis ◽  
Minor Amount ◽  
Conventional Solid State Reaction ◽  
High Permittivity ◽  
X Ray ◽  
The Matrix ◽  
Dielectric Ceramics ◽  
A Minor

Microwave (MW) dielectric ceramics in (1 - x)( Li 1/2 Nd 1/2) TiO 3–x CaTiO 3 (0.2 ≤ x ≤ 0.8) composition were prepared through the conventional solid-state reaction. X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM) combined with energy dispersive X-ray analysis (EDX) indicated that the matrix phase was a continuous solid solution with orthorhombic perovskite structure. A minor amount of secondary phase was detected only in the composition of x = 0.7 and 0.8. The (1 - x)( Li 1/2 Nd 1/2) TiO 3–x CaTiO 3 ceramics showed a very high permittivity of 118–153 and reasonable Q × f0 values of 2360–5930 GHz as x increased from 0.2 to 0.8. The temperature coefficient of resonant frequency (τf) of the samples increased with increasing x value and was approximately linearly proportional to εr. Bi 4 B 2 O 9 addition effectively tailored the τf of (1 - x)( Li 1/2 Nd 1/2) TiO 3–x CaTiO 3 ceramics to near zero at low temperature, and induced no degradation of Q × f0 value. The x = 0.3 composition with 20 wt .% Bi 4 B 2 O 9 addition sintered at 1050°C exhibited dielectric properties of εr = 112.4, Q × f0 = 2414 GHz and τf = 8.9 ppm/°C.

scholarly journals Effect of sintering on crystallization and structural properties of soda lime silica glass

2017 ◽  
Vol 49 (4) ◽  
pp. 409-417 ◽  
Author(s):  
Mohd Zaid ◽  
Khamirul Matori ◽  
Aziz Ab ◽  
Zaidan Wahab ◽  
Siti Rashid
Keyword(s):  
Random Network ◽  
Glass Ceramics ◽  
Soda Lime ◽  
Xrd Analysis ◽  
Linear Shrinkage ◽  
Minor Amount ◽  
Chemical Bonds ◽  
X Ray ◽  
Ceramic Insulators ◽  
A Minor

The effect of sintering temperatures on crystallization and structural of the soda lime silica (SLS) glass was reported. Elemental weight composition of the SLS glass powder was identified through Energy dispersive X-ray fluorescence (EDXRF) analysis while the thermal behavior of the glass was determined using Differential thermal analysis (DTA) technique. Archimedes? method and direct geometric measurement were respectively used to determine bulk density and linear shrinkage of the glass samples. Crystallisation behavior of the samples was investigated by X-ray diffraction (XRD) analysis and chemical bonds present in the samples were measured using Fourier Transform Infrared (FTIR) spectroscopy. Results showed an increase in the density and linear shrinkage of the samples as a function of the sintering temperature. The XRD analysis revealed the formation of ?-quartz (SiO2) and a minor amount of devitrite phases in the samples and these were further verified through the detection of chemical bonds by FTIR after sintering at 800?C. The properties of the glass-ceramics can be explained on the basis of crystal chemistry which indicated that the alkali ions formed as carriers in the random network structure and can be recommended for the manufacture of glass fiber or toughened glass-ceramic insulators.

Microstructure and nonohmic properties of SnO2–Ta2O5–TiO2 varistor system doped with CuO

2014 ◽  
Vol 28 (15) ◽  
pp. 1450085 ◽  
Author(s):  
Zhijian Peng ◽  
Ruichao Gao ◽  
Feng Jiang ◽  
Jianfeng He ◽  
Xiuli Fu
Keyword(s):  
Processing Method ◽  
Minor Amount ◽  
Ceramic Processing ◽  
X Ray Diffraction ◽  
Doping Amount ◽  
X Ray ◽  
Field Versus ◽  
Xrd Patterns ◽  
A Minor ◽  
Conventional Ceramic Processing

The microstructure and nonohmic properties of SnO 2– Ta 2 O 5– TiO 2- CuO varistor system were investigated. The proposed samples were doped with different contents of CuO (0–6 mol%) and sintered at 1400°C for 2 h with conventional ceramic processing method. In all the samples, the commonly identified phase was SnO 2 (rutile); however, with increasing doping amount of CuO , the peaks of CuO phase emerged in the X-ray diffraction (XRD) patterns. Scanning electron microscopy (SEM) examination on the fractured surfaces of the samples revealed that a minor amount of CuO dopant can facilitate the sintering of the varistor ceramics, but excessive CuO would mainly segregate at grain-boundaries. The doped CuO may also act as a modifier in the SnO 2 based varistors. The measured electric-field versus current-density characteristics of the samples indicated that both nonlinear exponent and varistor voltage increased with increasing doping amount of CuO up to 3 mol% and then decreased with excessive CuO .

Identification of acid-insoluble filter-plugging compounds and optimal acid-washing procedures for tubular backpulse pressure filters

TAPPI Journal ◽  
2011 ◽  
Vol 10 (1) ◽  
pp. 17-23
Author(s):  
KEVIN TAYLOR ◽  
RICH ADDERLY ◽  
GAVIN BAXTER
Keyword(s):  
Calcium Sulfate ◽  
Membrane Filter ◽  
Sulfamic Acid ◽  
Xrd Analysis ◽  
Metal Sulfides ◽  
X Ray Diffraction ◽  
X Ray ◽  
Gypsum Formation ◽  
Acid Washing ◽  
Hydrolysis Of

Over time, performance of tubular backpulse pressure filters in kraft mills deteriorates, even with regular acid washing. Unscheduled filter replacement due to filter plugging results in significant costs and may result in mill downtime. We identified acid-insoluble filter-plugging materials by scanning electron microscope/energy-dispersion X-ray spectroscopy (SEM/EDS) and X-ray diffraction (XRD) analysis in both polypropylene and Gore-Tex™ membrane filter socks. The major filter-plugging components were calcium sulfate (gypsum), calcium phosphate (hydroxylapatite), aluminosilicate clays, metal sulfides, and carbon. We carried out detailed sample analysis of both the standard acid-washing procedure and a modified procedure. Filter plugging by gypsum and metal sulfides appeared to occur because of the acid-washing procedure. Gypsum formation on the filter resulted from significant hydrolysis of sulfamic acid solution at temperatures greater than 130°F. Modification of the acid-washing procedure greatly reduced the amount of gypsum and addition of a surfactant to the acid reduced wash time and mobilized some of the carbon from the filter. With surfactant, acid washing was 95% complete after 40 min.

scholarly journals X-ray and Neutron Study on the Structure of Hydrous SiO2 Glass up to 10 GPa

Minerals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 84 ◽  
Author(s):  
Satoru Urakawa ◽  
Toru Inoue ◽  
Takanori Hattori ◽  
Asami Sano-Furukawa ◽  
Shinji Kohara ◽  
...  
Keyword(s):  
Oxide Glasses ◽  
Void Space ◽  
X Ray Diffraction ◽  
Amorphous Sio2 ◽  
Sio2 Glass ◽  
X Ray ◽  
X Ray Scattering ◽  
Medium Range ◽  
Two Phases ◽  
A Minor

The structure of hydrous amorphous SiO2 is fundamental in order to investigate the effects of water on the physicochemical properties of oxide glasses and magma. The hydrous SiO2 glass with 13 wt.% D2O was synthesized under high-pressure and high-temperature conditions and its structure was investigated by small angle X-ray scattering, X-ray diffraction, and neutron diffraction experiments at pressures of up to 10 GPa and room temperature. This hydrous glass is separated into two phases: a major phase rich in SiO2 and a minor phase rich in D2O molecules distributed as small domains with dimensions of less than 100 Å. Medium-range order of the hydrous glass shrinks compared to the anhydrous SiO2 glass by disruption of SiO4 linkage due to the formation of Si–OD deuterioxyl, while the response of its structure to pressure is almost the same as that of the anhydrous SiO2 glass. Most of D2O molecules are in the small domains and hardly penetrate into the void space in the ring consisting of SiO4 tetrahedra.

A study on using expanded perlite with hydroxyapatite: Reinforced bio-composites

2021 ◽  
pp. 095441192199656
Author(s):  
Erdoğan Karip ◽  
Mehtap Muratoğlu
Keyword(s):  
Body Fluid ◽  
Xrd Analysis ◽  
Cold Isostatic Pressing ◽  
Expanded Perlite ◽  
X Ray Diffraction ◽  
Pressing Method ◽  
X Ray ◽  
Infra Red ◽  
Ft Ir

People are exposed to different kinds of diseases or various accidents in life. Hydroxyapatite (HA) has been widely employed for bone treatment applications. In this study, HA was extracted from sheep bones. Bio-composites were doped with 1, 5, and 10 wt.% of expanded perlite and 5 wt.% of ZrO2–MgO-P2O5. The bio-composites were prepared by the cold isostatic pressing method (250 MPa) and sintered at 900°C for 1 h. In order to evaluate the characteristics of the bio-composites, microhardness, density, X-ray diffraction (XRD), Fourier transform infra-red spectroscopy (FT-IR), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) analyses were carried out on them. Additionally, the specimens whose characteristics were determined were kept in synthetic body fluid (SBF), and their in vitro behavior was examined. As a result, it was observed that microhardness increased as both the weight and the grain size of the expanded perlite were increased. Calcium silicate, tri-calcium phosphate, and hydroxyapatite were observed in the XRD analysis of all samples, and the formation of apatite structures was increased by addition of ZrO2–MgO–P2O5.

scholarly journals Hydrothermal Ageing and Its Effect on Fracture Load of Zirconia Dental Implants

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3103
Author(s):  
Laurent Gremillard ◽  
Agnès Mattlet ◽  
Alexandre Mathevon ◽  
Damien Fabrègue ◽  
Bruno Zberg ◽  
...  
Keyword(s):  
Dental Implants ◽  
Fracture Load ◽  
Accelerated Ageing ◽  
Dental Ceramics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dental Restorations ◽  
Different Temperatures ◽  
Mechanical Performances ◽  
Kinetics Of

Due to growing demand for metal-free dental restorations, dental ceramics, especially dental zirconia, represent an increasing share of the dental implants market. They may offer mechanical performances of the same range as titanium ones. However, their use is still restricted by a lack of confidence in their durability and, in particular, in their ability to resist hydrothermal ageing. In the present study, the ageing kinetics of commercial zirconia dental implants are characterized by X-ray diffraction after accelerated ageing in an autoclave at different temperatures, enabling their extrapolation to body temperature. Measurements of the fracture loads show no effect of hydrothermal ageing even after ageing treatments simulated a 90-year implantation.

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