Synthesis of nanocrystalline carbonated hydroxyapatite powder via nonalkoxide sol–gel method

Rajabi-Zamani, Amir Hossein; Behnamghader, A.; Kazemzadeh, Asghar

doi:10.1016/j.msec.2008.02.001

Cited by 79 publications

(35 citation statements)

References 26 publications

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“…The characteristic bands from inorganic carbonate ion suggest that carbon gets dissolved in the organics from atmosphere and does not pyrolyze completely and may instead dissolve into the HA crystal. Since carbonates are constituents of bone structures (Rajabi-Zamani et al 2008), the presence of CO 3 may improve the bioactivity of HA rather than being a cause of concern.…”

Section: Resultsmentioning

confidence: 99%

Preparation and characterization of nano-hydroxyapatite powder using sol-gel technique

et al. 2009

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Hydroxyapatite (HA) nano powders (20-60 nm) were synthesized using a sol-gel route with calcium nitrate and phosphoric acid as calcium and phosphorus precursors, respectively. Double distilled water was used as a diluting media for HA sol preparation and ammonia was used to adjust the pH. After aging, the HA gel was dried at 65°C and calcined to different temperatures ranging from 200-800°C. The dried and calcined powders were characterized for phase composition using X-ray diffractometry, elemental dispersive X-ray and Fourier transform infra-red spectroscopy. The particle size and morphology were studied using transmission electron microscopy. Calcination revealed HA nano powders of increased particle size and crystallinity with increase in temperature. For all calcinations temperatures, the particle size distribution analysis of HA powders showed skewed distribution plot. At temperature of 700°C and above, formation of CaO was noticed which was attributed to phosphorous volatilization. This study showed that high purity HA with varying degrees of crystallinity could be obtained using this simple technique.

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Section: Resultsmentioning

confidence: 99%

Preparation and characterization of nano-hydroxyapatite powder using sol-gel technique

et al. 2009

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“…Most of these techniques produced rod-like crystals or whiskers, while plate-like shapes were obtained in just a few studies [335,345,347]. Other preparation methods of nanodimensional and/or nanocrystalline apatites of various states, shapes and sizes include sol-gel [30,188,231,232,270,328,[360][361][362][363][364][365][366][367][368][369][370][371][372][373][374][375][376], co-precipitation [271,333,334,[377][378][379][380], mechanochemical approach[65, 250,343,348,[381][382][383][384][385][386][387], mechanical alloying [388,389], ball milling [348,383,…”

Section: Nanodimensional and Nanocrystalline Apatitesmentioning

confidence: 99%

Nanodimensional and Nanocrystalline Calcium Orthophosphates

Dorozhkin¹

2012

AJBE

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Nano-sized particles and crystals play an important role in the formation of calcified tissues of various animals. For example, nano-sized and nanocrystalline calcium orthophosphates in the form of apatites of biological origin represent the basic inorganic building blocks of bones and teeth of mammals. Namely, according the recent developments in biomineralization, tens to hundreds nanodimensional crystals of a biological apatite are self-assembled into these complex structures. This process occurs under a strict control by bioorganic matrixes. Furthermore, both a greater viability and a better proliferation of various types of cells have been detected on smaller crystals of calcium orthophosphates. Thus, the nano-sized and nanocrystalline forms of calcium orthophosphates have a great potential to revolutionize the hard tissue-engineering field, starting from bone repair and augmentation to controlled drug delivery systems. This review reports on current state of the art and recent developments on the subject, starting from synthesis and characterization to biomedical and clinical applications. Furthermore, the review also discusses possible directions for future research and development.

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“…In this same graph the morphology of the oxides (white zones) can be appreciated, its size varies according to the speed with which the coatings were formed, that is to say, for speeds of obtaining 4000 rpm (Figure-1c) Greater agglomeration of the oxide with a smaller size of them. This can be attributed to the centrifugation process and consequently to the final thickness of the coatings, and also according to the investigations of Rajabi-Zamani and Feng the agglomerated structures observed in micrographs of Figure-1 are due to the aging or gelation time of the soles from which the coatings were formed 18,19,20 . Through the results of dispersive energies (EDX) it is possible to determine the composition of the oxides.…”

Section: Detection Methodsmentioning

confidence: 58%

Effect of Centrifugal Speed on the Anticorrosive Properties of Bismuth-Silicon Coatings by Sol-Gel on 316l Substrates

Bautista-Ruiz¹,

Aperador²,

Olaya³

2018

RJC

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In this investigation, the compound Bi24Si40O2 was synthesized via sol-gel and applied on substrates of 316L stainless steel by spin coating varying speed. In the coatings obtained, the corrosion response in simulated physiological solution was evaluated by electrochemical impedance spectroscopy and polarization potentiodynamic curves. The morphology and surface topography was studied, also, were determined the microstructure, thickness values and roughness of the coatings. The results of this study allow establishing a high degree of anticorrosive effectiveness offered by the coatings as a function of the number of layers applied to the substrate and their possible application in the biomedical industry.

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Synthesis of nanocrystalline carbonated hydroxyapatite powder via nonalkoxide sol–gel method

Cited by 79 publications

References 26 publications

Preparation and characterization of nano-hydroxyapatite powder using sol-gel technique

Preparation and characterization of nano-hydroxyapatite powder using sol-gel technique

Nanodimensional and Nanocrystalline Calcium Orthophosphates

Effect of Centrifugal Speed on the Anticorrosive Properties of Bismuth-Silicon Coatings by Sol-Gel on 316l Substrates

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