Preparation and Characterization of (HAp/SiO&lt;sub&gt;2&lt;/sub&gt;)/Ti Biocomposites

Zhang, Xue; Xiu, Zhi Meng; Li, Xiao Wu

doi:10.4028/www.scientific.net/amr.217-218.88

Cited by 5 publications

(3 citation statements)

References 19 publications

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“…Then some of these Ca 2+ rapidly reacted with CDHA (see eq ) to form HA crystals; meanwhile, during the continued release of the Ca 2+ and P 5+ from BGCC coating into SBF solution, a large number of the silanol (Si–OH) groups formed in the surface layer of BGCC coating directly from SiO 2 or from the reactions of the BG phase of BGC powders and the hydration products of Ca 2 SiO 4 with H 2 O. The formation of Si–OH groups has an important effect on the nucleation and amount of HA. − Higher Ca 2+ concentration can induce apatite formation on the surface of the specimens; moreover, the other ions, like HPO 4 2– , CO 3 2– , etc., from the SBF solution would promote the formation of apatite nuclei. Once the nuclei were formed, the crystal will continuously grow up, because the SBF was oversaturated with respect to apatite, and finally the HA deposition layer was formed.…”

Section: Results and Discussionmentioning

confidence: 99%

Preparation and Characterizations of Bioglass Ceramic Cement/Ca–P Coating on Pure Magnesium for Biomedical Applications

Zhang

et al. 2013

ACS Appl. Mater. Interfaces

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Magnesium has been recently recognized as a biodegradable metal for bone substitute applications. In order to improve the biocompatibility and osteointegration of pure Mg, two kinds of coatings, i.e., the Ca-P coating and bioglass ceramic cement (BGCC)/Ca-P coating, were prepared on the pure Mg ribbons in the present work. The Ca-P coating was obtained by aqueous solution method. Subsequently, Ca-P coated Mg was immersed into the BGCC slurry, which was prepared by the mix of SiO2-CaO-P2O5 bioglass ceramic (BGC) powders and phosphate liquid with a liquid-to-solid ratio (L/S) of 1.6, to obtain BGCC/Ca-P coating by a dipping-pulling method. The microstructures, morphologies, and compositions of these coatings have been characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) with energy-dispersive spectroscopy (EDS). The effect of these coatings on the mineralization activity of pure Mg has been investigated. The results indicated that both the Ca-P coating and BGCC/Ca-P coating could promote the nucleation of osteoconductive minerals, i.e., bone-like apatite, and the hydroxyapatite (HA) layer formed on the surface of the BGCC/Ca-P coating is obviously more dense, thick, and stable than that formed on the Ca-P coating after immersion in SBF solution for 15 days. The potentiodynamic polarization test indicated that the corrosion current density of the BGCC/Ca-P coated Mg is obviously lower than that of the Ca-P coating and 10 times lower than that of uncoated Mg. These results demonstrated that the BGCC/Ca-P coating can increase significantly the corrosion resistance of Mg and introduce a high biocompatibility of the bone-Mg substrate interface. In summary, the newly developed BGCC/Ca-P coated Mg has a good potential for biomedical applications.

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Section: Results and Discussionmentioning

confidence: 99%

Preparation and Characterizations of Bioglass Ceramic Cement/Ca–P Coating on Pure Magnesium for Biomedical Applications

Zhang

et al. 2013

ACS Appl. Mater. Interfaces

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“…VE‐cadherin is expressed only on ECs and functions as a gatekeeper of endothelial junctions . Therefore, CD144 is the most specific marker for EMPs . In contrast to PECAM‐1 and MCAM, VE‐cadherin is specifically located at adherence junctions .…”

Section: Empsmentioning

confidence: 99%

Endothelial microparticles act as novel diagnostic and therapeutic biomarkers of circulatory hypoxia‐related diseases: a literature review

Deng

Wang

Zhang

2017

J Cellular Molecular Medi

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Circulatory hypoxia‐related diseases (CHRDs), including acute coronary syndromes, stroke and organ transplantation, attract increased attention due to high morbidity and mortality. Mounting evidence shows that hypoxia‐induced oxidative stress, coagulation, inflammation and angiogenesis play extremely important roles in the physiological and pathological processes of CHRD‐related vascular endothelial injury. Interestingly, hypoxia, even hypoxia‐induced oxidative stress, coagulation and inflammation can all induce release of endothelial microparticles (EMPs). EMPs, shed from activated or apoptotic endothelial cells (ECs), reflect the degree of EC damage, and elevated EMP levels are found in several CHRDs. Furthermore, EMPs, which play an important role in cell‐to‐cell communication and function, have confirmed pro‐coagulant, proinflammatory, angiogenic and other functions, affecting pathological processes. These findings suggest that EMPs and CHRDs have a very close relationship, and EMPs may help to identify CHRD phenotypes and stratify the severity of disease, to improve risk stratification for developing CHRDs, to better define prophylactic strategies and to ameliorate prognostic characterization of patients with CHRDs. This review summarizes the known and potential roles of EMPs in the diagnosis, staging, treatment and clinical prognosis of CHRDs.

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“…By means of the wet impregnation method (17)(18)(19), Salazar (20) synthesized two types of tungstenbased catalysts, one using titania (TiO 2 ) as the support of the active phase and the other using zirconia (ZrO 2 ). The catalyst with WO 3 (active phase) supported on TiO 2 (rutile) showed higher activity and selectivity toward ethanol production.…”

Section: Introductionmentioning

confidence: 99%

Estudio computacional por DFT de la superficie (001) de WO3 tetragonal (P4/nmm)

Loaiza-Orduz

Araujo-López

Urresta

et al. 2018

inycomp

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El WO3 tetragonal tiene importancia en reacciones catalíticas tales como la hidratación del etileno, que es unaalternativa a la obtención de etanol por fermentación. Sin embargo, muy poco se conoce acerca de la estructuray propiedades electrónicas de la superficie de WO3 tetragonal con posible actividad catalítica. En este trabajo, secaracterizó la superficie WO3 (001) mediante simulaciones computacionales utilizando la teoría del funcionalde densidad. Se determinaron los parámetros de la celda unitaria y los correspondientes ángulos y distancias deenlace, y se calculó la densidad de estados (DOS) en volumen obteniéndose un valor para el ancho de banda de0.6 eV. Se generaron dos modelos de superficie en la dirección (001) del volumen, uno sin átomos de oxígeno enla superficie (modelo I) y otro con un solo átomo de oxígeno en la superficie (modelo II). Para ambos modelos seusaron en los cálculos cuatro capas de átomos y un vacío de 14 Å entre losas vecinas. Se obtuvieron valores de135.01 y 40.55 meV/ Å2 para las energías superficiales de los modelos I y II respectivamente, mostrando que elmodelo II tiene asociada una mayor probabilidad de representar al catalizador de WO3. Se calculó la densidad deestados de ambos modelos, observándose un ancho de banda cercano a cero.

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Preparation and Characterization of (HAp/SiO<sub>2</sub>)/Ti Biocomposites

Cited by 5 publications

References 19 publications

Preparation and Characterizations of Bioglass Ceramic Cement/Ca–P Coating on Pure Magnesium for Biomedical Applications

Preparation and Characterizations of Bioglass Ceramic Cement/Ca–P Coating on Pure Magnesium for Biomedical Applications

Endothelial microparticles act as novel diagnostic and therapeutic biomarkers of circulatory hypoxia‐related diseases: a literature review

Estudio computacional por DFT de la superficie (001) de WO3 tetragonal (P4/nmm)

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