Synthesis and Structural Characterization of Silica-Hybridized Hydroxyapatite with Gas Adsorption Capability

Fujii, Eiji; Kawabata, Koji S.; Ando, Kanae; Tsuru, Kanji; Hayakawa, Satoshi; Osaka, Akiyoshi

doi:10.2109/jcersj.114.769

Cited by 16 publications

(4 citation statements)

References 14 publications

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“…The peaks at −91.1 and −99.2 are possibly due to the Q 2 [Si(OSi) 2 (O − ) 2 ] and Q 3 [Si(OSi) 3 O − ] environments. 80,81 Gasquères et al. 82 achieved 4.6 wt% Si-HA using a precipitation method; however, they reported that only a small fraction is incorporated into HA in the form of Q 0 ( SiO4 4- ) and the remaining silicate units were located outside the HA structure and corresponded to silica-gel units.…”

Section: Resultsmentioning

confidence: 99%

Rapid hydrothermal flow synthesis and characterisation of carbonate- and silicate-substituted calcium phosphates

et al. 2012

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A range of crystalline and nano-sized carbonate- and silicate-substituted hydroxyapatite has been successfully produced by using continuous hydrothermal flow synthesis technology. Ion-substituted calcium phosphates are better candidates for bone replacement applications (due to improved bioactivity) as compared to phase-pure hydroxyapatite. Urea was used as a carbonate source for synthesising phase pure carbonated hydroxyapatite (CO3-HA) with ≈5 wt% substituted carbonate content (sample 7.5CO3-HA) and it was found that a further increase in urea concentration in solution resulted in biphasic mixtures of carbonate-substituted hydroxyapatite and calcium carbonate. Transmission electron microscopy images revealed that the particle size of hydroxyapatite decreased with increasing urea concentration. Energy-dispersive X-ray spectroscopy result revealed a calcium deficient apatite with Ca:P molar ratio of 1.45 (±0.04) in sample 7.5CO3-HA. For silicate-substituted hydroxyapatite (SiO4-HA) silicon acetate was used as a silicate ion source. It was observed that a substitution threshold of ∼1.1 wt% exists for synthesis of SiO4-HA in the continuous hydrothermal flow synthesis system, which could be due to the decreasing yields with progressive increase in silicon acetate concentration. All the as-precipitated powders (without any additional heat treatments) were analysed using techniques including Transmission electron microscopy, X-ray powder diffraction, Differential scanning calorimetry, Thermogravimetric analysis, Raman spectroscopy and Fourier transform infrared spectroscopy.

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Section: Resultsmentioning

confidence: 99%

Rapid hydrothermal flow synthesis and characterisation of carbonate- and silicate-substituted calcium phosphates

et al. 2012

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“…32 Moreover, the surface of HA possesses several P-OH groups, which act as adsorption sites for various molecules, such as H 2 O, CH 3 OH, and CH 3 I. 33,34 The nanocrystalline and porous nature of HA powder plays a vital role in the adsorption of a large number of chemical gases. 35,36 However, for pure HA based gas sensors, the response is low and the operating temperature is relatively high, in comparison with that of semiconductor based gas sensors.…”

Section: Introductionmentioning

confidence: 99%

Facile and controllable synthesis of hydroxyapatite/graphene hybrid materials with enhanced sensing performance towards ammonia

Zhang

Liu

Zhang

et al. 2015

Analyst

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In this work, needle-like and micro-spherical agglomerates of nanocrystalline hydroxyapatite (HA) were successfully assembled on the surface of graphene sheets with the aid of dopamine having two roles, as a template and a reductant for graphite oxide during the process of self-polymerization. The crystalline structure and micromorphology of HA can be conveniently regulated by controlling the mineralization route either with a precipitation (cHA/GR) or biomimetic methodology (bHA/GR). Both the composites exhibit improvements of ∼150% and ∼250% in sensitivity towards the sensing of ammonia at room temperature, compared with that of bare graphene. The combination of the multi-adsorption capability of HA and the electric conductivity of graphene is proposed to be the major reason for the observed enhancements. Gas sensing tests demonstrated that the HA/GR composites exhibit excellent selectivity, high sensitivity and repeatable stability towards the analytical sensing of ammonia.

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“…Many researchers [2,14,[16][17][18][19][20] have focalized the phenomena of attenuation parameters of various materials. When referring the former investigations, the chemical analysis, morphological and mechanical facilities, adsorbing and corrosion were researched by different studies for a lot of HAp [21][22][23][24][25][26]. The gamma ray attenuation parameters were not calculated by these authors for pure and manganese substituted artificial bone dust.…”

Section: Introductionmentioning

confidence: 99%

A research on the gamma ray attenuation characteristics for real bone and manganese substituted artificial bone dust

Köksal¹,

Tozar²,

Cengi̇z³

et al. 2020

Cumhuriyet Science Journal

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This research focalized on the gamma ray attenuation charesteristics of real bone and manganese substituted Nano hydroxyapatite artificial bone dusts. The current samples were excited with using 59.5 keV photons emitted from an 241 Am annular radioisotope source with 50 mCi activity by using a narrow beam transmission geometry and detected with using Ultra Low Energy Germanium detector with a resolution 150 eV at 5,95 keV experimentally. The gamma-ray attenuation parameters such as linear attenuation coefficient, half value layer, tenth value layer and mean free path are also calculated experimentally and theoretically. The present results points out that the attenuation values of the manganese substituted hydroxyapatite artificial bone dust is very close to the value of the real bone.

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Synthesis and Structural Characterization of Silica-Hybridized Hydroxyapatite with Gas Adsorption Capability

Cited by 16 publications

References 14 publications

Rapid hydrothermal flow synthesis and characterisation of carbonate- and silicate-substituted calcium phosphates

Rapid hydrothermal flow synthesis and characterisation of carbonate- and silicate-substituted calcium phosphates

Facile and controllable synthesis of hydroxyapatite/graphene hybrid materials with enhanced sensing performance towards ammonia

A research on the gamma ray attenuation characteristics for real bone and manganese substituted artificial bone dust

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