Gas injection approach for synthesis of hydroxyapatite nanorods via hydrothermal method

Nosrati, Hassan; Sarraf-Mamoory, Rasoul; Le, Dang Quang Svend; Bünger, Cody; Emameh, Reza Zolfaghari; Dabir, Fatemeh

doi:10.1016/j.matchar.2019.110071

Cited by 37 publications

(63 citation statements)

References 58 publications

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“…It can be concluded that the leached obtained showed no significant toxicity to the osteoblasts culture (over a 7-day period). The only difference with the previously published work [52] is the morphology of the cells that are globular. The presence of GNR, which has become hydrophobic by the loss of its surface agents, may have caused this change.…”

Section: Resultscontrasting

confidence: 56%

“…Figure 2 shows the XRD pattern of GNR-HA powders, HA crystal planes, and FESEM images of GNR-HA powders. According to the XRD pattern of the synthesized powders (Figure 2a), full conformity is achieved between the reference standard of pure HA (JCPDS 09-0432) and the peaks obtained [52]. Accordingly, the HA has a high purity hexagonal structure.…”

Section: High-resolution Transmission Electron Microscopymentioning

confidence: 58%

“…As previously reported [52], sintering of the powders was performed at 950 • C. The biocompatibility assays were performed exactly similar to the previous report [52]. The Archimedes method was used to calculate the relative density of sintered samples (ASTM C373-88).…”

Section: Evaluation Of the Sinteredsamplesmentioning

confidence: 99%

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Synthesis of Graphene Nanoribbons–Hydroxyapatite Nanocomposite Applicable in Biomedicine and Theranostics

Nosrati

Sarraf-Mamoory

Ahmadi

et al. 2020

JNT

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In order to investigate the effect of graphene nanoribbons on the final properties of hydroxyapatite-based nanocomposites, a solvothermal method was used at 180 °C and 5 h for the synthesis of graphene nanoribbons–hydroxyapatite nanopowders by employing hydrogen gas injection. Calcium nitrate tetrahydrate and diammonium hydrogenphosphate were used as calcium and phosphate precursors, respectively. To synthesize the powders, a solvent containing diethylene glycol, anhydrous ethanol, dimethylformamide, and water was used. Graphene oxide nanoribbons were synthesized by chemical unzipping of carbon nanotubes under oxidative conditions. The synthesized powders were consolidated by spark plasma sintering methodat 950 °C and a pressure of 50 MPa. The powders and sintered samples were then evaluated using X-ray diffraction, Raman spectroscopy, high-resolution transmission electron microscopy, Vickers microindentation techniques, and biocompatibility assay. The findings of this study showed that the final powders synthesized by the solvothermal method had calcium to phosphate ratio of about 1.67. By adding a small amount of graphene nanoribbon (0.5%W), elastic modulus and hardness of hydroxyapatite increased dramatically. In biological experiments, the difference of hydroxyapatite effect in comparison with the nanocomposite was not significant. The findings of this study showed that graphene nanoribbons have a positive effect on the properties of hydroxyapatite, and these findings would be useful for the medical and theranostic application of this type of nanocomposites.

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Section: Resultscontrasting

confidence: 56%

Section: High-resolution Transmission Electron Microscopymentioning

confidence: 58%

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Synthesis of Graphene Nanoribbons–Hydroxyapatite Nanocomposite Applicable in Biomedicine and Theranostics

Nosrati

Sarraf-Mamoory

Ahmadi

et al. 2020

JNT

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“…But at high loading rates, the energy was spent on elastic deformation, plastic deformation, nucleation and growth of created cracks. The hardness and elastic modulus of this composite (hydrothermal process in 5 h) at 1 N loading was equal to the properties of pure HA under similar conditions and the hydrothermal process in 10 h [37]. This indicated that the presence of rGO sheets had a great influence on the mechanical properties because of the lower crystallinity of the powders at low synthesis times.…”

Section: Preparation Of Ha-rgo Nanocompositementioning

confidence: 66%

“…Elastic modulus and hardness were calculated from the load-displacement curves (figure 2(c)) using Oliver-Pharr method [36]. Table 1 shows the specifications for the analytical methods and devices [34,37]. A diamond nail was used to evaluate the nanocomposite's resistance to scratch.…”

Section: Preparation Of Ha-rgo Nanocompositementioning

confidence: 99%

Investigating the mechanical behavior of hydroxyapatite-reduced graphene oxide nanocomposite under different loading rates

Nosrati

Sarraf-Mamoory

et al. 2020

Nano Ex.

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In this study, the hydroxyapatite (HA)-reduced graphene oxide (rGO) nanocomposite was investigated for its mechanical properties. The nanocomposite used in this study was made in two stages. The HA-rGO powders were first synthesized by hydrogen gas injected hydrothermal method, and then consolidated by spark plasma sintering. HA-rGO nanocomposite was subjected to Vickers indentation experiments with different loading rates. Various analyzes have been used in this study, including x-rays diffraction, field emission scanning electron microscopy, high-resolution transmission electron microscopy, fast fourier transform, and inverse fast fourier transform. The findings of this study showed that the HA in this nanocomposite was reinforced with rGO sheets coated with HA. As the loading rate increased, the slope of the curves in the elastic region was increased, indicating that the elastic modulus was increased. Also, the contact depth at higher loading rates was increased. Plastic deformation was higher at higher loading rates and the hardness had increased. As the loading rate increased from 300 mN to 1 N, the hardness and elastic modulus increased with more slope than when the loading rate changed from 1 N to 2 N. The presence of rGO sheets had partially controlled the HA brittleness.

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Investigating the structure, solubility, and antibacterial properties of silver‐ and copper‐doped hydroxyapatite

et al. 2022

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Hydroxyapatite (HA) powders were synthesized by the wet precipitation method in which two experimental compositions were synthesized (10 mol% Ag-HA and Cu-HA)where the CaNO 3 content was partially substituted with AgNO 3 and Cu(NO 3 ) 2 .X-ray diffraction (XRD) was employed to characterize changes to the HA structure as the dopants (Cu 2+ , Ag + ) were incorporated into the materials structure. Energydispersive X-ray spectroscopy (EDS) determined confirmed the compositions and found that the Ca/P ratio was 1.63 for the control (HA) while Ag-HA and Cu-HA exhibited (X + Ca)/P ratios of 1.79 and 1.65, respectively. Antibacterial efficacies were evaluated against E. coli and S. aureus, as a function of surface area and incubation time. The more prominent antibacterial effects were observed with both Ag-HA and Cu-HA and the materials antibacterial influence was maintained with respect to time. Ion release studies of each HA composition (15, 30, and 45 days) showed that Cu-HA released significantly more Cu 2+ (36.1 ± 5.1 mg/L) than Ag + (2.9 ± 1.2 mg/L) from Ag-HA. Analysis of each composition incubated in simulated body fluid (SBF) exhibited surface depositions that are likely calcium phosphate (CaP). Cytocompatibility testing in MC 3T3 Osteoblasts showed slight reductions in cell viability when tested using MTT assay, however cell adhesion studies were positive for each composition.

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Gas injection approach for synthesis of hydroxyapatite nanorods via hydrothermal method

Cited by 37 publications

References 58 publications

Synthesis of Graphene Nanoribbons–Hydroxyapatite Nanocomposite Applicable in Biomedicine and Theranostics

Synthesis of Graphene Nanoribbons–Hydroxyapatite Nanocomposite Applicable in Biomedicine and Theranostics

Investigating the mechanical behavior of hydroxyapatite-reduced graphene oxide nanocomposite under different loading rates

Investigating the structure, solubility, and antibacterial properties of silver‐ and copper‐doped hydroxyapatite

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