Urea-assisted synthesis of hydroxyapatite nanorods from naturally occurring impure apatite rocks for biomedical applications

Wijesinghe, W.P.S.L.; Mantilaka, M.M.M.G.P.G.; Rajapakse, R.M.G.; Pitawala, H.M.T.G.A.; Premachandra, T. N.; Herath, H. M. T. U.; Rajapakse, R. P. V. J.; Wijayantha, K. G. Upul

doi:10.1039/c7ra02166f

Cited by 41 publications

(15 citation statements)

References 41 publications

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“…The N-TiO 2 was prepared by the sol-gel method [20,21] and it was done by following a procedure reported by Wu et al [22] where isopropyl alcohol (C 3 H 7 OH) and Ti(OC 4 H 9 ) 4 , in acidic medium, were used to prepare TiO 2 nanoparticles. 5.0 mL of C 3 H 7 OH and Ti(OC 4 H 9 ) 4 was mixed with 30.0 mL of 0.20 mol dm −3 HNO 3 solution.…”

Section: Preparation Of N-tio 2 Nanoparticlesmentioning

confidence: 99%

Heterogeneous photocatalytic degradation of toluene in static environment employing thin films of nitrogen-doped nano-titanium dioxide

et al. 2018

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Photocatalytic semiconductor thin films have the ability to degrade volatile organic compounds (VOCs) causing numerous health problems. The group of VOCs called "BTEX" is abundant in houses and indoor of automobiles. Anatase phase of TiO 2 has a band gap of 3.2 eV and UV radiation is required for photogeneration of electrons and holes in TiO 2 particles. This band gap can be decreased significantly when TiO 2 is doped with nitrogen (N-TiO 2). Dopants like Pd, Cd, and Ag are hazardous to human health but N-doped TiO 2 can be used in indoor pollutant remediation. In this research, N-doped TiO 2 nano-powder was prepared and characterized using various analytical techniques. N-TiO 2 was made in sol-gel method and triethylamine (N(CH 2 CH 3) 3) was used as the N-precursor. Modified quartz cell was used to measure the photocatalytic degradation of toluene. N-doped TiO 2 nano-powder was illuminated with visible light (xenon lamp 200 W, λ = 330-800 nm, intensity = 1 Sun) to cause the degradation of VOCs present in static air. Photocatalyst was coated on a thin glass plate, using the doctor-blade method, was inserted into a quartz cell containing 2.00 µL of toluene and 35 min was allowed for evaporation/condensation equilibrium and then illuminated for 2 h. Remarkably, the highest value of efficiency 85% was observed in the 1 μm thick N-TiO 2 thin film. The kinetics of photocatalytic degradation of toluene by N-TiO 2 and P25-TiO 2 has been compared. Surface topology was studied by varying the thickness of the N-TiO 2 thin films. The surface nanostructures were analysed and studied with atomic force microscopy with various thin film thicknesses.

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Section: Preparation Of N-tio 2 Nanoparticlesmentioning

confidence: 99%

Heterogeneous photocatalytic degradation of toluene in static environment employing thin films of nitrogen-doped nano-titanium dioxide

et al. 2018

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“…Therefore, alternative methods and simple techniques are employed to synthesize HA nanoparticles in industrial-scale with good quality, uniformity and perfect crystalline structure [11]. The various synthetic methods used to generate HA nanoparticles include microwave assisted, hydrothermal, sol-gel, microemulsion, freezing method, solvothermal, high-gravity precipitation and chemical precipitation methods [11][12][13][14][15][16][17]. However, in recent years, autoclave assisted hydrothermal method is also highly employed for the nanoparticle synthesis.…”

Section: Introductionmentioning

confidence: 99%

Effect of anions on the structural, morphological and dielectric properties of hydrothermally synthesized hydroxyapatite nanoparticles

Sundarabharathi¹,

Ponnamma

Parangusan

et al. 2019

SN Appl. Sci.

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Synthetic nano hydroxyapatites (HA) have been considered as potential biomaterials for bone tissue engineering applications because of its excellent biological properties. The present work deals with the synthesis of HA nanoparticles from different anion source materials via autoclave assisted hydrothermal method. All the prepared HA nanoparticles were characterized by X-ray diffraction (XRD), Fourier transformation infrared spectra, field emission scanning electron microscopy, energy dispersive spectra and high resolution transmission electron microscopy. The XRD patterns reveal the pure and hexagonal phase structure with smaller crystallite size for HA obtained from various calcium salt precursors. HA particles prepared from nitrate precursors show spherical morphology with 32 nm grain size whereas those derived from the acetate, chloride and egg shell precursors respectively show needle-like, irregular and oval morphology. The effect of different anions on the dielectric properties and alternating conductivity of HA is investigated, as a polarized surface can trigger biological reactions. For the particles obtained from nitrate, acetate, chloride and egg shell precursors respectively give dielectric constant (εʹ) values of 9.96, 13.22, 9.92 and 10.86 at 5 MHz. The εʹ and dielectric loss (εʹʹ) values for the HA nanoparticles decrease with increase in the applied frequency as well. The alternating current conductivity values confirm that the as-synthesized HA samples exhibit insulating behavior. In short this article provides the various applicability of HA particles in optoelectronics and drug delivery.

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“…The hydroxyl stretching vibration of nHAP was located at 3571 and 633 cm -1 [11]. However, weak peaks of carbonate group was also detected at 1455 and 1410 cm -1 [12]. It reveals that obtained nHAP was doped by carbonate ions, due to the carbon dioxide in atmosphere reacted with reaction Advances in Engineering Research,volume 120 mixture.…”

Section: Methodsmentioning

confidence: 90%

Ultrasonic-assisted Synthesis Of Rod-shaped Hydroxyapatite Nanoparticles

Deng¹,

Yu²,

Bi³

2018

Proceedings of the 2017 3rd International Forum on Energy, Environment Science and Materials (IFEESM 2017)

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Abstract. In this paper, to develop a new method to rapidly synthesize hydroxyapatite nanoparticles as a controlled release carrier, sonochemical method was used to prepare nano-hydroxyapatite (nHAP) without any surfactant and used calcium nitrate tetrahydrate and diammonium hydrogen phosphate as source materials. The composition of obtained hydroxyapatite nanoparticles was determined by X-ray powder diffraction (XRD) and fourier transform infrared spectra (FT-IR). The morphologies and microstructure were observed by transmission electron microscope (TEM). Pure nHAP was successfully synthesized by ultrasonic method without any surfactant. The particles shows not obvious reunion and display rod-shaped structure with length of about 40-120 nm and width of about 30 nm.

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Urea-assisted synthesis of hydroxyapatite nanorods from naturally occurring impure apatite rocks for biomedical applications

Abstract: Hydroxyapatite (HA) nanoparticles are heavily used materials in biomedical applications.

Cited by 41 publications

References 41 publications

Heterogeneous photocatalytic degradation of toluene in static environment employing thin films of nitrogen-doped nano-titanium dioxide

Heterogeneous photocatalytic degradation of toluene in static environment employing thin films of nitrogen-doped nano-titanium dioxide

Effect of anions on the structural, morphological and dielectric properties of hydrothermally synthesized hydroxyapatite nanoparticles

Ultrasonic-assisted Synthesis Of Rod-shaped Hydroxyapatite Nanoparticles

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