scholarly journals Analysis of structure, bioactivity and hardness of titanium incorporated bioactive glass

2019 ◽  
Vol 6 (2) ◽  
pp. 128-137
Keyword(s):  
Bioactive Glass ◽  
Body Fluid ◽  
Glass Composition ◽  
Hardness Testing ◽  
X Ray Diffraction ◽  
X Ray ◽  
Tio2 Addition ◽  
Diffraction Patterns ◽  
Hardness Values ◽  
Microscopy Images

A series of bioactive glass composition were prepared, and the effects of TiO2 addition on the structure, bioactivity and hardness of the glasses were analyzed. This study consisted of glass characterization, simulated body fluid (SBF) trials, and hardness testing. Three glasses were formulated, where a SiO2-CaO-Na2O-P2O5 bioactive glass was used as control, with the addition of 5 and 10 wt.% TiO2 at the expense of CaO. X-ray diffraction patterns confirmed that an amorphous microstructure was obtained for all three glasses. Differential thermal analysis indicated an increase in the glass transition temperature of the glass series from 660°C to 721°C with the incorporation of TiO2. Hot stage microscopy results exhibited higher sintering and softening temperatures for TiO2 containing glasses. Each glass was then incubated in SBF for 1, 10, and 30 days. Scanning electron microscopy images confirmed that the calcium phosphate particulates were precipitated on control glass after 10 days, however, for TiO2 containing glasses, the deposition layer was only observed after 30 days. The hardness of SBF incubated samples were tested, where TiO2 containing glasses showed significantly higher hardness values at each incubation period, with 0.72 GPa for control and 1.71 GPa for the TiO2 containing glass, after 30 days of incubation.

scholarly journals Enhanced apatite precipitation on a biopolymer-coated bioactive glass

2015 ◽  
Vol 1 (1) ◽  
Author(s):  
M. Araújo ◽  
M. Miola ◽  
A. Venturello ◽  
G. Baldi ◽  
J. Perez ◽  
...  
Keyword(s):  
Bioactive Glass ◽  
Body Fluid ◽  
Organic Coating ◽  
Medical Applications ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
Ph Measurements ◽  
X Ray ◽  
Ft Ir ◽  
Scanning Electron

AbstractIn this work, sintered pellets of a silica-based bioactive glass were dip-coated with a biocompatible natural-derived polymer in order to investigate the influence of the organic coating on the glass bioactivity. After the sintering process optimization, uncoated and coated pellets have been characterized by means of scanning electron microscopy with energy dispersive spectroscopy (SEM, EDS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and pH measurements, after the immersion in a simulated body fluid (SBF). An increased apatite forming ability and a better control of the pH during soaking of the samples in SBF were observed in the presence of the biopolymer. This result opens a new insight on the simple fabrication of highly bioactive hybrid inorganic-organic materials for medical applications.

Facile Refluxing Synthesis of Hydroxyapatite Nanoparticles

2015 ◽  
Vol 68 (8) ◽  
pp. 1293 ◽  
Author(s):  
Pakvipar Chaopanich ◽  
Punnama Siriphannon
Keyword(s):  
Crystallite Size ◽  
Reaction Times ◽  
Single Step ◽  
Hydroxyapatite Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Aqueous Mixture ◽  
Diffraction Patterns ◽  
Microscopy Images

Hydroxyapatite (HAp) nanoparticles were successfully synthesized from an aqueous mixture of Ca(NO3)2·4H2O and (NH4)2HPO4 by a facile single-step refluxing method using polystyrene sulfonate (PSS) as a template. The effects of reaction times, pH, and PSS concentration on the HAp formation were investigated. It was found that the crystalline HAp was obtained under all conditions after refluxing the precursors for 3 and 6 h. The longer refluxing time, the greater the crystallinity and the larger the crystallite size of the HAp nanoparticles. The HAp with poor crystallinity was obtained at pH 8.5; however, the well-crystallized HAp was obtained when reaction pH was increased to 9.5 and 10.5. In addition, the X-ray diffraction patterns revealed that the presence of PSS template caused the reduction of HAp crystallite size along the (002) plane from 52.6 nm of non-template HAp to 43.4 nm and 41.4 nm of HAp with 0.05 and 0.2 wt-% PSS template, respectively. Transmission electron microscopy images of the synthesized HAp revealed the rod-shaped crystals of all samples. The synthesized HAp nanoparticles were modified by l-aspartic acid (Asp) and l-arginine (Arg), having negative and positive charges, respectively. It was found that the zeta potential of HAp was significantly changed from +5.46 to –24.70 mV after modification with Asp, whereas it was +4.72 mV in the Arg-modified HAp. These results suggested that the negatively charged amino acid was preferentially adsorbed onto the synthesized HAp surface.

Intergrowth of several solid phases from the Y–Ni–B–C system in a large YNi2B2C crystal

2008 ◽  
Vol 41 (4) ◽  
pp. 738-746 ◽  
Author(s):  
Torsten Weissbach ◽  
Tilmann Leisegang ◽  
Andreas Kreyssig ◽  
Matthias Frontzek ◽  
Jens-Uwe Hoffmann ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
X Ray Diffraction ◽  
Orientation Relation ◽  
X Ray ◽  
Polished Cross Section ◽  
Diffraction Patterns ◽  
The Individual ◽  
Microscopy Images ◽  
Scanning Electron

A YNi2B2C single crystal containing traces of foreign phases was inspected by means of neutron and X-ray diffraction as well as scanning electron microscopy and X-ray spectroscopy methods. The diffraction patterns obtained from the experiments look similar to those expected for a superstructure. Nevertheless, they can be interpreted as crystallographically oriented precipitations of YB2C2and Ni2B within the YNi2B2C crystal, formed during the cooling process. The orientation relation between the lattices was obtained from experimental neutron and X-ray data. Structure refinements of the collected X-ray data were performed by separation of the intensity data of the individual phases. Scanning electron microscopy images of the inclusions found on a polished cross section of the crystal are presented; their chemical composition was determined using wavelength-dispersive X-ray analysis.

In Vitro Bioactivity of Composite of Nanophase Titania/Bioactive Glass-Ceramic in Simulated Body Fluid

2005 ◽  
Vol 288-289 ◽  
pp. 171-174
Author(s):  
Hui Wang ◽  
Bang Cheng Yang ◽  
Qi Feng Yu ◽  
Dayi Wu ◽  
Xing Dong Zhang
Keyword(s):  
Simulated Body Fluid ◽  
Bioactive Glass ◽  
Glass Ceramic ◽  
Body Fluid ◽  
Mechanical Analysis ◽  
Apatite Formation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Biomechanical Compatibility

Titania ceramics is lack of bone-bonding ability even if it has excellent biocompatibility. Recently, it is even found that the nanophase titania ceramics could enhance the proliferation of osteoblasts. If the bone-bonding ability of this material is improved, it would be a potential bone replacement material. Bioactive glass-ceramic (BGC) is provided with the best bioactivity in biomaterials. In this study, the apatite formation ability and the mechanic properties of titania ceramic were investigated by the accession of BGC. Four samples: TiO2 ceramic, TiO2 +10%BGC, TiO2 +20%BGC and BGC were prepared respectively. These ceramics were exposed to a simulated body fluid (SBF) for 7, 14 and 21d. Scanning electron microscopy (SEM), energy dispersive X-ray detector (EDX) and thin film X-ray diffraction (TF-XRD) results showed that the apatite formation of the ceramics was improved by adding BGC into nanophase titania ceramic. The mechanical analysis showed the biomechanical compatibility was also improved by adding BGC into nanophase titania ceramic.

Modification of Ge2Sb2Te5 by the Addition of SiOx for Improved Operation of Phase Change Random Access Memory

2005 ◽  
Vol 888 ◽  
Author(s):  
Jin-Seo Noh ◽  
Dong-Seok Suh ◽  
Sang Mock Lee ◽  
Kijoon H. P. Kim ◽  
Woong-Chul Shin ◽  
...  
Keyword(s):  
Room Temperature ◽  
Random Access ◽  
X Ray Diffraction ◽  
Access Memory ◽  
X Ray ◽  
Transmission Electron ◽  
Diffraction Patterns ◽  
Critical Requirement ◽  
Current Reduction ◽  
Microscopy Images

ABSTRACTConventional Ge2Sb2Te5 (GST) was modified by adding up a small amount of SiOx, using co-sputtering technique from multiple targets. The SiOx content was gradually increased by increasing the power applied to SiOx target, up to 8 volume percent. The sheet resistance of SiOx-containing GST exponentially increased, when the room-temperature-deposited samples were annealed at 300 °C. Transmission electron microscopy images revealed that no SiOx particulates were formed, which was confirmed by Gattan image filtering. It was indicated by x-ray diffraction patterns that the grain size of SiOx-containing GST is smaller than normal GST with lattice locally distorted at its crystalline state, suggesting that molecular SiOx is homogeneously distributed throughout the GST matrix. We observed that the crystallization temperature of SiOx-containing GST is gradually elevated by increasing the SiOx content, while the melting point decreased. These observations led to the reset current reduction, which is a critical requirement for the high density PRAM.

Effects of the Sintering Temperature on Structural and Bioactivity in BaFe12O19-P2O5-CaO-Na2O Bioactive Glass Ceramic

2015 ◽  
Vol 804 ◽  
pp. 147-150
Author(s):  
Pratthana Intawin ◽  
Kamonpan Pengpat ◽  
Wilaiwan Leenakul ◽  
Tawee Tunkasiri
Keyword(s):  
Mechanical Properties ◽  
Bioactive Glass ◽  
Glass Ceramic ◽  
Sintering Temperature ◽  
Glass Ceramics ◽  
Microstructural Properties ◽  
Hardness Testing ◽  
X Ray Diffraction ◽  
X Ray

In this research, the effects of sintering temperatures on structural and bioactivity in BaFe12O19 (BF) /P2O5-CaO-Na2O bioactive glass ceramics were investigated. The BF/P2O5-CaO-Na2O bioactive glass ceramics were fabricated under various sintering temperatures in a range of 550-700 oC. X-ray diffraction (XRD) technique and the scanning electron microscopy (SEM) are used to characterize phase and microstructure. The studied samples were evaluated for mechanical properties by hardness testing. Moreover, the bioactivities of studied samples were studied by using simulated body fluid (SBF) in vitro. It was found that, the sintering temperatures are the most influential parameter on microstructure and mechanical properties of the bioactive glass ceramics. The highest density of studied ceramics was found in the sample sintered at 700 oC. The microstructural properties of the studies samples were investigated and the results were then correlated with the characteristics of sintering temperature as well as the microstructure of the bioactive glass ceramic. Moreover, the covering of bone-like apatite layer on the surface sample after a 7 day immersion in SBF suggested that the BF/P2O5-CaO-Na2O glass ceramics have acceptable bioactivities.

Facile Preparation of Cadmium Gallate Nanoparticles as a Novel Photocatalyst with High Efficiency and Stability

2019 ◽  
Vol 11 (5) ◽  
pp. 678-682
Author(s):  
Ce Liang ◽  
Nian Tao ◽  
Bowen Wang ◽  
Wenjun Liu ◽  
Ke Bi ◽  
...  
Keyword(s):  
High Efficiency ◽  
Blue Shift ◽  
X Ray Diffraction ◽  
Calcination Process ◽  
X Ray ◽  
Subsequent Calcination ◽  
Uv Visible ◽  
Diffraction Patterns ◽  
Performance Results ◽  
Microscopy Images

In this work, we introduced a facile approach for preparing cadmium gallate (CdGa2 O4 nanoparticles, and we first studied the photocatalytic properties of this ternary spinel oxide. Through a solvothermal process for the formation of precursor and the subsequent calcination process for recrystallization, CdGa2 O4 nanoparticles with diameter of ca. 12 nm were synthesized. They were characterized by using X-ray diffraction patterns and electron microscopy images. UV-visible diffuse absorption spectroscopy was also conducted; its spectra indicate that CdGa2 O4 nanoparticles have strong but small blue-shift absorption relative to that of the bulk samples. Moreover, the CdGa2 O4 nanoparticles could photocatalytically decompose rhodamine B (RhB) molecules with high efficiency in aqueous solution under ultraviolet irradiation. Notably, this novel photocatalyst exhibited outstanding recycling stability, and it retained almost the same capacity in the fourth photocatalytic cycle. We deduce that the high photocatalytic performance results from the large specific surface area, energetic photoinduced carriers, and inherent stability.

Ambient Condition Synthesis of Ag Submicron Crystallites from AgNO3, H2O2 and NH3•H2O

2011 ◽  
Vol 391-392 ◽  
pp. 1392-1395
Author(s):  
Jing Li ◽  
Yong Cai Zhang
Keyword(s):  
Aqueous Solutions ◽  
Atmospheric Pressure ◽  
Cost Effective ◽  
Cubic Phase ◽  
Present System ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cost Effective Method ◽  
Diffraction Patterns ◽  
Microscopy Images

A simple and cost-effective method based on the reduction of AgNO3 by H2O2 (5 vol.%) in 2.5–5 vol.% NH3•H2O aqueous solutions at room temperature and under atmospheric pressure was developed for the synthesis of Ag submicron crystallites. X-ray diffraction patterns demonstrated that the resultant products were pure cubic phase Ag powders. Field emission scanning electronic microscopy images showed that the Ag powders synthesized in 2.5 and 5 vol.% NH3•H2O aqueous solutions comprised submicron crystallites with the sizes of about 355–580 and 200–650 nm, respectively. Besides, the possible formation mechanism of Ag powders in the present system was also proposed.

Chemistry, morphology and structural characteristics of synthetic Al-lizardite

Clay Minerals ◽  
2010 ◽  
Vol 45 (2) ◽  
pp. 131-143 ◽  
Author(s):  
M. Bentabol ◽  
M. D. Ruiz Cruz ◽  
I. Sobrados
Keyword(s):  
Structural Characteristics ◽  
X Ray Diffraction ◽  
Hydrothermal Conditions ◽  
Single Population ◽  
X Ray ◽  
Cell Parameters ◽  
Transmission Electron ◽  
Diffraction Patterns ◽  
Microscopy Images ◽  
Stacking Disorder

AbstractAl-lizardite has been synthesized under hydrothermal conditions (200ºC). Morphologically, Al-lizardite consists of thin platy particles ~400 Å wide and ~150 Å thick. Structurally, the X-ray diffraction patterns indicate that the 2H2 polytype is dominant, with cell parameters: a = 5.311(0.006) Å; c = 14.333 (0.013) Å and space group P63. High-resolution transmission electron microscopy images revealed, however, the presence of other polytypes and abundant stacking disorder. Chemically, Al-lizardite consists of a single population with average tetrahedral composition Si1.74Al0.26. In contrast to previously described Al-rich serpentines (amesite and Al-lizardite), this Al-lizardite is characterized by an asymmetrical Al distribution, with VIAl ≈0.70 and IVAl ≈0.25 atoms per formula unit.

Development of New Composition of Bioactive Glass Powder from SiO2-CaO-Na2O-P2O5 System through Melt-Derived Route

2017 ◽  
Vol 888 ◽  
pp. 267-272 ◽  
Author(s):  
Nurul Farhana Ibrahim ◽  
Hasmaliza Mohamad ◽  
Siti Noor Fazliah Mohd Noor
Keyword(s):  
Bioactive Glass ◽  
Glass Composition ◽  
Glass Structure ◽  
Amorphous Structure ◽  
X Ray Diffraction ◽  
Silica Network ◽  
Carbonate Group ◽  
Xrd Pattern ◽  
X Ray ◽  
Amorphous Glass

In this studies, melt-derived route was employed to fabricate new composition of bioactive glass (BG) from SiO2-CaO-Na2O-P2O5 system. Amorphous glass structure is confirmed through X-ray diffraction (XRD). Fourier transform infrared spectroscope (FTIR) confirmed the formation of silica network with the existence of functional groups Si-O-Si (bend), Si-O-Si (tetrahedral) and Si-O-Si (stretch) for all glass composition. The bioactivity of all BG is verified by incubation in Hank’s Balanced Salt Solution (HBSS) for 1h and 24h. Based on XRD pattern, it is confirmed that all glass composition remained in amorphous structure even after 24h of immersion with weak characteristic of carbonate group (C-O) and P-O band detected in FTIR analysis on carbonated hyrdoxyapatite (CHA) formation. Therefore, the objective to develop new composition of BG is achiveable despite the lack of CHA formation.

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