Effect of Na+ and NaOH concentrations on the surface morphology and dissolution behavior of hydroxyapatite

Mao, Zu-Li; Yang, Xiao; Zhu, Shengli; Cui, Zhenduo; Li, Zhaoyang

doi:10.1016/j.ceramint.2014.10.162

Cited by 10 publications

(6 citation statements)

References 46 publications

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“…Hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 , HA) bio-ceramic which has good bioactivity and osteo-inductivity is a major component of human bones and teeth [4,5,6]. Therefore, hydroxyapatite coatings are usually prepared on the surface of clinical medical implants to facilitate the growth of newborn bones in organism [7,8]. Nowadays, the main bone scaffold materials that are widely evaluated are non-degradable metal materials such as titanium and its alloys, 316 L stainless steel, etc.…”

Section: Introductionmentioning

confidence: 99%

Properties and Mechanism of Hydroxyapatite Coating Prepared by Electrodeposition on a Braid for Biodegradable Bone Scaffolds

Ling

Lin

et al. 2019

Nanomaterials

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Hydroxyapatite (HA) coating is successfully prepared by electrodeposition on the surface of polyvinyl alcohol (PVA)/polylactic acid (PLA) braid which serves as a potential biodegradable bone scaffold. The surface morphology, element composition, crystallinity and chemical bonds of HA coatings at various deposition times (60, 75, 90, 105 and 120 min) are characterized by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR), respectively. Average Surface roughness (Ra) of HA coating is observed by confocal microscopy. The results reveal that the typical characteristic peaks of the FTIR spectrum confirm that HA coating is successfully prepared on the rugged surface of the PVA/PLA braid. The XRD results indicate that the crystallinity of HA can be improved by increasing deposition time. In the 90 min-deposition, hydroxyapatite has a dense and uniform coating morphology, Ca/P ratio of 1.7, roughness of 0.725 μm, which shows the best electrodeposition performance. The formation mechanism of granular and plate-like hydroxyapatite crystals is explained by the structural characteristics of a hydroxyapatite unit cell. This study provides a foundation for a bone scaffold braided by biodegradable fibers.

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Section: Introductionmentioning

confidence: 99%

Properties and Mechanism of Hydroxyapatite Coating Prepared by Electrodeposition on a Braid for Biodegradable Bone Scaffolds

Ling

Lin

et al. 2019

Nanomaterials

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“…However, as shown in Figure b, the V-HAP prepared under pH = 13 showed lower activity as compared to pH 11. The addition of NaOH may have prevented the formation of HAP because of the reaction between Na and PO 4 to form NaHPO 4 , Na 2 HPO 4 , and Na 3 PO 4 . , Another possibility is that Na was doped onto the HAP structure, which could influence the doping of V into the structure. , Therefore, pH 11 was chosen as the optimum pH for the V-HAP synthesis for HMF oxidation.…”

Section: Resultsmentioning

confidence: 99%

Exploiting an Efficient and Stable Catalyst for the Selective Oxidation of 5-Hydroxymethylfurfural to 2,5-Diformylfuran by Incorporating Vanadium in the Framework of Hydroxyapatite

Patria

Kumar

Luo

et al. 2022

ACS Sustainable Chem. Eng.

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Hydroxyapatite displays immense potential in catalysis because of its properties to form doped single and multiphasic systems. In the present study, vanadium-incorporated hydroxyapatite was investigated for aerobic oxidation of 5-hydroxymethylfurfural to 2,5-diformylfuran. The amount of vanadium precursor and the pH in catalyst synthesis were significant factors in defining the catalytic properties of V-HAP. The morphologies and structures of the catalysts were well studied. Field emission scanning electron microscopy revealed different morphologies of the catalyst with varying amounts of vanadium and pH, suggesting that both these factors play a critical role in determining the catalytic properties. Through X-ray diffraction spectra, the incorporation of vanadium ions into the HAP framework by replacing phosphate ions was confirmed by the augmentation of lattice parameters and unit cell volume. The vanadium amount corresponding to x = 3 and pH 11 for the synthesis of the catalyst displayed good catalytic efficiency for HMF conversion. To further enhance the performance of the synthesized catalyst, the reaction parameters such as the temperature of reaction and catalyst loading were optimized. Under optimum reaction conditions, 78% HMF conversion with 63 and 81% DFF yield and selectivity, respectively, was observed. V-HAP (x = 3) was highly stable in nature and did not show a decrease in activity during experimental cycles, thereby showing that the incorporated vanadium did not leach out and that the catalyst was recyclable, which was also confirmed by energy-dispersive X-ray spectroscopy results. V-HAP (x = 3) was also compared with V2O5-HAP and was found to have superior catalytic properties as compared to the latter. This study contributes to the development of green and stable catalysts for biomass conversion.

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“…The nanocrystalline structure closely resembles the nanostructure of fully set CPC published in earlier studies [ 4 , 5 ]. Those would only be expected to show adverse formation effects in an acidic environment, while NaOH concentrations might, on the contrary, lead to a more pronounced HAp formation in the case of a cement that has not yet entirely completed the setting reaction [ 50 ]. The appearance of microcracks in addition to the surface roughness [ 51 ] in the PCL fibers after etching ( Figure 4 E,F) might indicate an impact by strong forces that the PCL fibers experienced during hardening of the CPC strands, proving that both materials integrate with each other.…”

Section: Discussionmentioning

confidence: 99%

3D Plotting of Calcium Phosphate Cement and Melt Electrowriting of Polycaprolactone Microfibers in One Scaffold: A Hybrid Additive Manufacturing Process

Kilian

Witzleben

Lanaro

et al. 2022

JFB

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The fabrication of patient-specific scaffolds for bone substitutes is possible through extrusion-based 3D printing of calcium phosphate cements (CPC) which allows the generation of structures with a high degree of customization and interconnected porosity. Given the brittleness of this clinically approved material, the stability of open-porous scaffolds cannot always be secured. Herein, a multi-technological approach allowed the simultaneous combination of CPC printing with melt electrowriting (MEW) of polycaprolactone (PCL) microfibers in an alternating, tunable design in one automated fabrication process. The hybrid CPC+PCL scaffolds with varying CPC strand distance (800–2000 µm) and integrated PCL fibers featured a strong CPC to PCL interface. While no adverse effect on mechanical stiffness was detected by the PCL-supported scaffold design; the microfiber integration led to an improved integrity. The pore distance between CPC strands was gradually increased to identify at which critical CPC porosity the microfibers would have a significant impact on pore bridging behavior and growth of seeded cells. At a CPC strand distance of 1600 µm, after 2 weeks of cultivation, the incorporation of PCL fibers led to pore coverage by a human mesenchymal stem cell line and an elevated proliferation level of murine pre-osteoblasts. The integrated fabrication approach allows versatile design adjustments on different levels.

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Effect of Na+ and NaOH concentrations on the surface morphology and dissolution behavior of hydroxyapatite

Cited by 10 publications

References 46 publications

Properties and Mechanism of Hydroxyapatite Coating Prepared by Electrodeposition on a Braid for Biodegradable Bone Scaffolds

Properties and Mechanism of Hydroxyapatite Coating Prepared by Electrodeposition on a Braid for Biodegradable Bone Scaffolds

Exploiting an Efficient and Stable Catalyst for the Selective Oxidation of 5-Hydroxymethylfurfural to 2,5-Diformylfuran by Incorporating Vanadium in the Framework of Hydroxyapatite

3D Plotting of Calcium Phosphate Cement and Melt Electrowriting of Polycaprolactone Microfibers in One Scaffold: A Hybrid Additive Manufacturing Process

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