Materials for Tissue Engineering

Vallet‐Regí, María; Salinas, Antonio J.

doi:10.1002/9783527691036.hsscvol4029

Cited by 5 publications

(5 citation statements)

References 94 publications

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“…The spectrum shows bands at 475, 575, 966, 1090-1220 and 3370 cm −1 , attributed to stretching modes of phosphate and O-H functional groups, respectively (Figure 3a). The stretching band of C=O of the CO 3 2− group at 1660 cm −1 indicates the incorporation of carbonate in apatite structure that could improve the absorption or catalytic activity of HAp. To prove that the carbonate, phosphate and hydroxyl sites on the catalyst are stable after each run of recyclability, we obtained the FT-IR spectrum of HAp after five runs ( Figure 3b) and compared with fresh HAp (Figure 3a).…”

Section: Op Oetmentioning

confidence: 99%

Synthesis and characterization of nanocrystalline hydroxyapatite and its catalytic behavior towards synthesis of 3,4‐disubstituted isoxazole‐5(4H)‐ones in water

Maleki

Chahkandi

Tayebee

et al. 2019

Applied Organom Chemis

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In the present work, the nanocrystalline particles of hydroxyapatite (HAp) using an easy alkoxide‐based sol–gel technique including triethyl phosphate [PO (OC2H5)3] and Ca (NO3)2·4H2O as P and Ca precursors have been synthesized. The sample characterization was performed by X‐ray diffraction, Fourier transform‐infrared analysis, scanning electron microscopy, thermal analysis (thermogravimetric analysis/differential thermal analysis), and elemental analysis of energy‐dispersive X‐ray analysis. It is interesting that single phase of HAp was obtained at a low firing temperature of 500°C. Modified Scherrer equation as the Williamson−Hall method was applied for the measurement of crystallite size distributions and micro‐strain of the sample. The determined crystallite size by complementary technique of transmission electron microscopy has good consistency with those obtained from the Scherrer formula. Moreover, we reported the one‐pot synthesis of 3,4‐disubstituted isoxazole‐5(4H)‐ones through the aqueous solution reaction of three components of ethyl acetoacetate, hydroxylamine hydrochloride and various aromatic aldehydes at room temperature. This protocol offers several advantages, including a simple work‐up procedure, very short reaction times (under 25 min), in accordance with the principles of green chemistry, recyclability, excellent yields (87–98%) and environmentally friendly.

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Section: Op Oetmentioning

confidence: 99%

Synthesis and characterization of nanocrystalline hydroxyapatite and its catalytic behavior towards synthesis of 3,4‐disubstituted isoxazole‐5(4H)‐ones in water

Maleki

Chahkandi

Tayebee

et al. 2019

Applied Organom Chemis

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“…Then, a continuous flow of argon maintained at 100 l h À1 was injected inside the working tube resulting in an increase of the pressure to about 10 À2 mbar. Finally, the temperature was applied in two steps ( Figure 2b) according to the protocol proposed by Vallet-Regi and Gonzalez-Calbet: a first plateau at 120°C during 1 h for water evaporation followed by a second plateau at 1 000°C during 1 h. [18] The flow of argon was maintained during the whole thermal treatment until the complete cooling to room temperature.…”

Section: Thermal Treatment Under Controlled Atmosphere (Thuca)mentioning

confidence: 99%

A New Process for the Thermal Treatment of Calcium Phosphate Coatings Electrodeposited on Ti6Al4V Substrate

et al. 2015

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This work presents a new experimental process for the thermal treatment of prosthetic coatings obtained by electrodeposition on titanium alloy Ti6Al4V. This thermal treatment is required to evaporate the solvent from the coating and to improve its cohesion and its adhesion to the titanium alloy substrate. When such treatment is carried out in air, the temperature is limited to 550°C due to the high oxidation of the titanium substrate. To overcome this limitation, we introduce a new thermal treatment process using a controlled atmosphere obtained by Argon injection under vacuum. In these conditions, the temperature can be increased up to 1 000°C. This process prevents the formation of the oxide layer onto the titanium alloy surface without noticeable modification of its mechanical properties. It also allows to obtain a fully crystallized biphasic coating made of hydroxyapatite and b-tricalcium phosphate. Consequently, this work resulted in obtaining an implant (calcium phosphate coating on Ti6Al4V) with improved mechanical properties.

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“…Furthermore, the crystal face at which the HA crystal grows was reported to affect the macroscopic morphology and morphology transformation of HA particles such as needle-like, platelet-like or spherical morphologies. [16,17] Accordingly, it can be supposed that the exposed crystal faces might be different on various shapes of HA particles. Recently, we found that rod-shaped HA (r-HA) particles could fuse with spherical HA (s-HA) particles during sintering, thus leading to enhanced compressive strength of the porous HA scaffolds.…”

Section: Introductionmentioning

confidence: 99%

The reactivity of surface modification of hydroxyapatite particles depends on their shape

Wang

Yang

et al. 2019

Polymer Composites

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The effect of hydroxyapatite (HA) particle shape on the reactivity of HA surfaces was investigated by selecting the rod‐shaped (r‐HA) and spherical HA particles (s‐HA) to coinitiate the ring‐opening polymerization of d,l‐lactide (DLLA) used stannous octoate (Sn(Oct)2) as the catalyst, respectively. It was found that both s‐HA and r‐HA could be grafted with PDLLA and the reactivity of s‐HA was higher than that of r‐HA according to the results from FTIR, NMR, TGA and BET method. The potential mechanism was that the shape of HA particles determined the crystal faces exposed to participate in graft reaction clarified by performing X‐ray diffraction detections and Materials Studio analysis. The primary crystal faces were (211) and (112) for s‐HA yet (002) and (300) for r‐HA. These findings suggested that the shape of HA particles might influence their reactivity, which might provide a new way to improve the graft ratio of polymers so as to prepare HA/polymer composites with strong interfacial strength by selecting or designing the shape of the HA particles.

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Materials for Tissue Engineering

Cited by 5 publications

References 94 publications

Synthesis and characterization of nanocrystalline hydroxyapatite and its catalytic behavior towards synthesis of 3,4‐disubstituted isoxazole‐5(4H)‐ones in water

Synthesis and characterization of nanocrystalline hydroxyapatite and its catalytic behavior towards synthesis of 3,4‐disubstituted isoxazole‐5(4H)‐ones in water

A New Process for the Thermal Treatment of Calcium Phosphate Coatings Electrodeposited on Ti6Al4V Substrate

The reactivity of surface modification of hydroxyapatite particles depends on their shape

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