Plate-like hydroxyapatite nanoparticles synthesized by the hydrothermal method

Zhang, Haibin; Zhou, Kechao; Li, Zhiyou; Huang, Suping

doi:10.1016/j.jpcs.2008.10.011

Cited by 109 publications

(57 citation statements)

References 36 publications

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“…9). Zhang et al (2009) reported that plate-like HA formed in cases where CN was used as the calcium stock solution. There are a few CPCs, e.g., octacalcium phosphate (Wang et al, 2004) and DCP (dicalcium phosphate) (Toyama et al, 2001), whose precipitation leads to plate-like crystals.…”

Section: Compressive Strength Imparted By Cpcmentioning

confidence: 99%

Novel grout material comprised of calcium phosphate compounds: In vitro evaluation of crystal precipitation and strength reinforcement

Akiyama¹,

Kawasaki

2012

Engineering Geology

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Calcium phosphate compounds (CPCs) have unique physicochemical properties. As grout material, they afford many advantages such as adequate physical strength, self-setting property, pH dependence of precipitation, non-toxicity, and recyclability. To apply CPCs to the permeability control and reinforcement of ground soil and rock, we explored suitable conditions for in vitro CPC precipitation, conducted unconfined compressive strength (UCS) tests of Toyoura sand test pieces cemented by CPC, and carried out observations and elemental analysis of precipitated CPC crystals.Two kinds of phosphate stock solution and two kinds of calcium stock solution were used to prepare the reaction mixtures, and CPC precipitation was detected in all reaction mixtures. The volume of CPC precipitation in the reaction mixture increased as the pH rose from strongly acidic to around neutral. The UCS of Toyoura sand test pieces cemented by 1.5 M diammonium phosphate and 0.75 M calcium acetate tended to increase with time, reaching a maximum of 63.5 kPa after 14 days of curing. Conversely, the UCS of test pieces cemented by using calcium nitrate was below 20 kPa and showed no significant increase in strength. CPC precipitation with calcium nitrate induced the formation of plate-like crystals, whereas that with calcium acetate induced whisker-like crystals.Elemental analysis of the cemented test pieces showed that the distributions of phosphorus and calcium were similar. The results indicate the practical feasibility of using novel CPC grouts as chemical grouts because of their self-setting property, and as biogrouts because of their crystal 3 structure and pH dependence of precipitation.

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Section: Compressive Strength Imparted By Cpcmentioning

confidence: 99%

Novel grout material comprised of calcium phosphate compounds: In vitro evaluation of crystal precipitation and strength reinforcement

Akiyama¹,

Kawasaki

2012

Engineering Geology

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“…Nanoparticles with several morphologies have been synthesized by means of solid-state reaction, the emulsion technique, sol-gel and the hydrothermal method. [6][7][8][9][10][11] However, the wet chemical precipitation method was proven to be one of the easiest ways of preparing HAn powders. Akao et al 10 prepared HAn nanocrystals based on the following reaction of calcium hydroxide (Ca(OH) 2 ) with orthophosphoric acid (H 3 PO 4 ):…”

Section: Introductionmentioning

confidence: 99%

A comparative study of hydroxyapatite nanoparticles synthesized by different routes

Paz¹,

Guadarrama²,

López³

et al. 2012

Quím. Nova

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In this study, bioactive hydroxyapatite nanoparticles were prepared by two different methods: wet chemical precipitation and biomimetic precipitation. The aim was to evaluate the morphology, particle-size, crystallinity and phases of the powders obtained by traditional wet chemical precipitation and the novel biomimetic precipitation using a supersaturated calcium solution. The nanoparticles were investigated by transmission electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction. The results revealed that the nanoparticles were formed by hydroxyapatite with a high crystallinity and controlled morphology. Additionally, it was found that the shape and size of the nanoparticles can be modified with each preparation method.

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“…9-432) and all peaks correspond to the hexagonal crystal form of HAp. 1,10,17,33,[47][48][49][50] From Figure 7, it can be seen that a decreasing degree of crystallinity leads to a decrease in intensity and an increase in width of the diffraction peaks. Moreover, the relative intensity of the peak (300) grows with the increase in the crystallinity degree, which shows that HAp may be oriented along the c-axis.…”

Section: The Fraction Of the Crystalline Phase In Hap Nanoparticlesmentioning

confidence: 99%

“…The peaks at 3437 and 1637 cm -1 are relative to the bending modes of the hydroxyl group in the adsorbed water, while the peaks at 3571 and 633 cm -1 are assigned to the stretching vibration of the hydroxyl group in the crystalline structure of HAp. 33,35,40,[50][51][52][53][54][55][56][57] From Figure S1, it can be seen that, with decreasing degree of crystallinity, the intensity of the absorption bands appearing at 3437 and 1637 cm -1 increases, while the intensity of the bands at 3571 and 633 cm -1 decreases. Therefore, according to the results presented here, the change in the intensity of the aforementioned peaks could be used as an alternative to the XRD patterns for determination of the degree of crystallinity.…”

Section: The Fraction Of the Crystalline Phase In Hap Nanoparticlesmentioning

confidence: 99%

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Design of experiments (DOE) for the optimization of hydrothermal synthesis of hydroxyapatite nanoparticles

Sadat‐Shojai¹,

Atai²,

Nodehi³

2011

J. Braz. Chem. Soc.

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O objetivo deste trabalho foi investigar a influência de diversos parâmetros de reação sobre as propriedades de nanopartículas de hidroxiapatita (HAp) preparadas pelo método hidrotérmico. Os dados da literatura descrevem condições experimentais variadas para a síntese hidrotérmica de HAp. Uma abordagem específica foi então utilizada para avaliar os fatores estatisticamente influentes entre aqueles descritos na literatura. O papel de cada parâmetro experimental também foi discutido no contexto da nucleação de partículas e do mecanismo de crescimento de cristais. Dentro das variáveis selecionadas, temperatura e pH foram os fatores que mais afetaram a composição e morfologia da HAp. Além disso, neste estudo, diferentes morfologias variando de nanopartículas cilíndricas do tipo bastonete a esféricas com várias características foram obtidas com sucesso, o que pode ser aplicável na preparação de várias biocerâmicas de HAp.The aim of this work was to investigate the influence of different reaction parameters on the properties of hydroxyapatite (HAp) nanoparticles prepared by the hydrothermal method. The literature data describe widely different experimental conditions for the hydrothermal synthesis of HAp. A specific approach was therefore used to evaluate the statistically influential factors among those described in the literature. The role of each experimental parameter was also discussed within the framework of particle nucleation and crystal growth mechanism. Among the selected variables, temperature and pH were found to be the most significant factors affecting the composition and morphology of the HAp. Moreover, in the present study, different morphologies ranging from rod-like to spherical nanoparticles with various characteristics were successfully obtained, which can be applicable for the preparation of various HAp bioceramics.

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Plate-like hydroxyapatite nanoparticles synthesized by the hydrothermal method

Cited by 109 publications

References 36 publications

Novel grout material comprised of calcium phosphate compounds: In vitro evaluation of crystal precipitation and strength reinforcement

Novel grout material comprised of calcium phosphate compounds: In vitro evaluation of crystal precipitation and strength reinforcement

A comparative study of hydroxyapatite nanoparticles synthesized by different routes

Design of experiments (DOE) for the optimization of hydrothermal synthesis of hydroxyapatite nanoparticles

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