Preparation and characterization of carboxyl functionalized multiwall carbon nanotubes–hydroxyapatite composites

Barabáş, Réka; Katona, Gabriel; Bogya, Erzsébet Sára; Diudea, Mircea V.; Szentes, A.; Zsirka, Balázs; Kovács, József; Kékedy-Nagy, Ladislau; Czikó, Melinda

doi:10.1016/j.ceramint.2015.06.104

Cited by 28 publications

(20 citation statements)

References 46 publications

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“…XRD diffractograms of non‐mineralized scaffold and CHCN3 are shown in Figure . The CHCN scaffold (Figure a) showed characteristic peaks at 8.3°, 11.3°, 18.2°, and 22.7° that corresponds to chitosan/carbon nanotubes association as described earlier . For the mineralized scaffold (Figure b), reflection peaks were observed at 25.9° (002) and 31.9° (211) which correspond to hydroxyapatite (HA) .…”

Section: Resultssupporting

confidence: 64%

In Vitro Mineralization Study of Chitosan/Carbon Nanotubes Scaffolds: Effect of Mineralization Cycles

Horn

Martins

Plepis

2018

Macromolecular Symposia

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In this study, bioactive scaffolds of chitosan/carbon nanotubes with calcium phosphate deposits with potential use in bone tissue regeneration were developed. Alternate mineralization processes using 1, 2, or 3 cycles are performed to investigate the nucleation of phosphate salts in the scaffolds. Characterization is carried out by thermogravimetry (TG), scanning electron microscopy (SEM), energy dispersive X‐ray spectroscopy (EDX), and X‐ray diffraction (XRD). TG curves confirmed that the number of mineralization cycles influence the amount of nucleated inorganic phosphate with an increase of up to 22%. As observed by SEM, the quantity and the size of pores decreased as a function of the number of mineralization cycles. The nucleated mineral is spherical in shape and with an average size of 0.73 ± 0.10 μm. An increase in the mineralization cycles promoted an increase in the quantity of calcium phosphate and the Ca/P ratio also showed dependence with the mineralization cycles. As observed by XRD, calcium phosphate deposited in scaffolds is calcium deficient hydroxyapatite. The crystallite size is estimated using the Sherreŕs equation as being of 15 ± 1 nm.

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Section: Resultssupporting

confidence: 64%

In Vitro Mineralization Study of Chitosan/Carbon Nanotubes Scaffolds: Effect of Mineralization Cycles

Horn

Martins

Plepis

2018

Macromolecular Symposia

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“…The thermal analysis of the sintered samples at 900 o C revealed no significant weight loss or exothermic/endothermic effects for decomposition or other transformation processes, while for dried samples at 105 o C, the combustion of fMWCNT between 400 and 600 o C was observed [12].…”

Section: Thermal Analysismentioning

confidence: 90%

“…According to BET measurements, the dried NCs (Hap-MWCNT-D -206 m 2 /g) had larger specific surface area than the sintered NCs (Hap-MWCNT-S -7.20 m 2 /g). A possible explanation for this difference is that MWCNTs were combusted from the structure during sintering at 900 o C resulting in lower specific surface area [12].…”

Section: Specific Surface Area (Bet)mentioning

confidence: 99%

“…Recently, great attention has been paid to the ions (Na, Mg, K, Sr, Zn, Ba, Cu, Al, Fe, F, Cl and Si) substituted Hap in order to create chemical compositions with more similarity to natural bone mineral [9,11]. Furthermore, the mechanical properties of Hap can be improved by adding carbon nanotubes (CNTs), but their toxicity still represents a major challenge, numerous conflicting studies demonstrating both toxic and nontoxic behavior [12,14]. The synthesized CNTs tend to agglomerate due to van der Waals forces and can be well-dispersed in water or organic solvents, without physical or chemical modification [15,16].…”

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of hydroxyapatite based nano-composite biomorphic implants

Barabáş¹,

Rigo²,

Eniszné-Bódogh³

et al. 2018

Studia UBB Chemia

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The aim of this study was the preparation and characterization of different biomorphic implants based on calcined cattle bones coated with hydroxyapatite (Hap) based nanocomposites in different ratios. For comparison, molded nanocomposites were also produced as biomorphic implants. The obtained nanocomposite/implants were characterized using Xray diffraction, light microscopy and scanning electron microscopy, Brunauer-Emmett-Teller surface area and apparent porosity. The release of Ca and P in simulated body fluid was monitored by X-ray fluorescence. The adsorption capacity and extended-release dosage of implants were investigated with ibuprofen, an anti-inflammatory drug, by UV-VIS spectroscopy. The highest adsorption efficiency and stability were obtained for sintered (S) (Hap-) and 20% gelatin (G) nanocomposite (Hap-20G-S) and bone parts coated with Hap-S and Hap-20G-S nanocomposite, respectively. The best results (high adsorption efficiency and slow release-low desorption capacity) were obtained for molded Hap-20G-S composite, without bone. In summary, the cattle bones with hydroxyapatite coatings show great promise in production of inexpensive and patient-specific bone implants.

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“…[1][2][3][4] Nanocomposites based on MWCNT dispersed in other materials received substantial attention to alleviate the obstacles associated with the limited scope of MWCNT towards the widespread utilization. 9,10 Despite the properties of MWCNTs, their excellence in various applications is limited due to propensity of weak dispersivity in different solvents. 9,10 Despite the properties of MWCNTs, their excellence in various applications is limited due to propensity of weak dispersivity in different solvents.…”

Section: Introductionmentioning

confidence: 99%

Decorated multi-walled carbon nanotubes with Sm doped fluorapatites: synthesis, characterization and catalytic activity

2016

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Novel and sustainable heterogeneous catalysts, namely, multi-walled carbon nanotubes (MWCNT) decorated with Sm doped fluorapatite nanocomposites (MWCNT/Sm-FAp) were prepared by facile coprecipitation method using glutamic acid as an organic modifier with different loadings of Sm (1%, 2%, 3%, 5%, and 7%). The nanocomposites were characterized by powder X-ray diffraction (PXRD), Fourier transform infra-red spectroscopy (FT-IR), microscopic techniques (FESEM, HRTEM), energy dispersive Xray spectrometer (EDX) and Brunauer-Emmett-Teller method (BET) surface area, and thermogravimetric analysis (TGA). The SEM and TEM results confirmed that with varying Sm loading, the nanocomposites attained varied particles sizes in the nano-grade scale with different morphologies. The N 2 adsorption isotherm results showed that the BET surface area of nanocomposites enhanced from MWCNT/1% Sm-FAp (47.60 m 2 g À1 ) to MWCNT/7% Sm-FAp (62.00 m 2 g À1 ). The robust catalytic behavior of the MWCNT/ Sm-FAp nanocomposites impressively showcased the esthetic results in the highly selective synthesis of the 1,2,4-triazole moiety from aromatic aldehydes. The catalytic efficiency increased with rise in Sm% from 1% to 5% in the nanocomposite. With MWCNTs/5% Sm-FAp nanocomposite as the catalyst, the reaction recorded 96% yield of triazole in short reaction times (10 min). Fig. 3 FESEM, EDX, HRTEM micrographs of (a-c) MWCNT/1% Sm-FAp (d-f) MWCNT/2% Sm-FAp (g-i) MWCNT/3% Sm-FAp (j-l) MWCNT/5% Sm-FAp (m-o) MWCNT/7% Sm-FAp. This journal is View Article Online a Reaction conditions: substituted benzaldehyde (1.0 mmol), thiosemicarbazide (1.0 mmol) catalyst and ethanol (5.0 mL) were stirred at room temperature.This journal is

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Preparation and characterization of carboxyl functionalized multiwall carbon nanotubes–hydroxyapatite composites

Cited by 28 publications

References 46 publications

In Vitro Mineralization Study of Chitosan/Carbon Nanotubes Scaffolds: Effect of Mineralization Cycles

In Vitro Mineralization Study of Chitosan/Carbon Nanotubes Scaffolds: Effect of Mineralization Cycles

Preparation and characterization of hydroxyapatite based nano-composite biomorphic implants

Decorated multi-walled carbon nanotubes with Sm doped fluorapatites: synthesis, characterization and catalytic activity

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