The effect of high-energy ball milling parameters on the preparation and characterization of fluorapatite nanocrystalline powder

Zahrani, E. Mohammadi; Fathi, Mohammadhossein

doi:10.1016/j.ceramint.2009.01.012

Cited by 58 publications

(11 citation statements)

References 38 publications

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“…Fluoridated hydroxyapatite powders which had a chemical composition of Ca 10 (PO 4 ) 6 (OH) 2−x F x (where x values were 0.0, 0.5, 1.0, 1.5 and 2.0 and named as FHA0, FHA25, FHA50, FHA75 and FHA100, respectively) were produced via the mechanical alloying method established in our previous works . According to the mentioned works, appropriate amount of calcium hydroxide (Ca(OH) 2 ), phosphorous pentoxide (P 2 O 5 ), and calcium fluoride (CaF 2 ) (all p.a, Merck, Darmstadt, Germany) were mechanically alloyed for 10 h, using a high‐energy planetary ball mill (Retsch, Haan, Germany) with a zirconia vial and zirconia balls.…”

Section: Methodsmentioning

confidence: 99%

The Effect of the Two‐Step Sintering Process on Consolidation of Fluoridated Hydroxyapatite and its Mechanical Properties and Bioactivity

Esnaashary

Fathi

Ahmadian

2013

Int J Applied Ceramic Tech

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The aim of this work was to evaluate the effect of the two‐step sintering process on consolidation of fluoridated hydroxyapatite (FHA). In addition, the effect of fluorine content on sinterability, mechanical properties, and bioactivity of FHA bulks was studied. Nanostructured FHA bulks were obtained under the conditions of 1000 and 900°C for the initial and secondary temperatures, respectively, without any structural decomposition. In addition, by increasing the fluorine content, the sinterability of FHA bulks was decreased and the hardness of FHA bulks was improved. Moreover, FHA bulks showed acceptable bioactivity.

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Section: Methodsmentioning

confidence: 99%

The Effect of the Two‐Step Sintering Process on Consolidation of Fluoridated Hydroxyapatite and its Mechanical Properties and Bioactivity

Esnaashary

Fathi

Ahmadian

2013

Int J Applied Ceramic Tech

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“…As far as we know, a relationship between structural hydroxyl groups and surface hydrated layer has been studied for the first time. Mechanochemical synthesis, activation, and modification of HA have already been investigated (Abdel-Aal et al 2008; Bignon et al 2002; Chaikina and Aman 2005; Isobe et al 2002; Mohammadi Zahrani and Fathi 2009; Nakano et al 2001; Nasiri-Tabrizi et al 2009; Nilpairach 1997; Ruksudjarit et al 2008). However, solid-state NMR has been used only once in mechanochemistry of apatites, that is, to characterize HA prepared by a wet-mechanochemical reaction (Isobe et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Solid-state MAS NMR, TEM, and TGA studies of structural hydroxyl groups and water in nanocrystalline apatites prepared by dry milling

Pajchel

Kołodziejski

2013

J Nanopart Res

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A series of nanocrystalline calcium hydroxyapatites was prepared by dry milling and characterized using proton and 31P MAS NMR, TEM, and TGA methods. The samples contained stubby rod-shaped crystals, which length and width varied in the 130–30 and 95–20 nm ranges, respectively. It was confirmed that concentration of structural hydroxyl groups in nanocrystalline apatites decreases with the decreasing crystal size. In the series of the studied apatites, the decrease was from 86 to ca. 50 % in reference to stoichiometric apatite. Water was found in the surface hydrated layer and in the c-axis channels, in which compartments existed as adsorbed and structural, respectively. Molecules of the adsorbed water were capable of moving from the crystal surface into the lattice c-axis channels of apatite. This process introduced considerable structural disorder within and around those channels and reduced the content of the structural hydroxyl groups, particularly in the region underneath the apatite crystal surface.Electronic supplementary materialThe online version of this article (doi:10.1007/s11051-013-1868-y) contains supplementary material, which is available to authorized users.

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“…Fabrication of the FA nanopowder was performed based on our previous work. [ 21 ] The FA nanopowder was prepared by mixing calcium hydroxide (Ca(OH) 2 ), phosphorous pentoxide (P 2 O 5 ) and calcium fluoride (CaF 2 ) in a planetary high energy ball mill using zirconia vial and zirconia balls with ball-to-powder weight ratio of 35:1, rotational speed of 300 rpm, and the time of 6 h.[ 21 22 ] Figure 2 shows transition electron microscopy micrograph of the FA powder particles. Size distribution of FA particles was 35-65 nm.…”

Section: Methodsmentioning

confidence: 99%

Novel bioactive Co-based alloy/FA nanocomposite for dental applications

Fathi¹,

Ahmadian²,

Bahrami³

2012

Dent Res J

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Background:Dental cobalt base alloys are biocompatible dental materials and have been widely used in dentistry. However, metals are bioinert and may not present bioactivity in human body. Bioactivity is the especial ability to interact with human body and make a bonding to soft and hard tissues. The aim of the present research was fabrication and bioactivity evaluation of novel cobalt alloy/Fluorapatite nanocomposite (CoA/FaNC) with different amounts of Fluorapatite (FA) nanopowder.Materials and Methods:Co-Cr-Mo alloy (ASTM F75) powder was prepared and mixed in a planetary ball mill with different amounts of FA nanopowders (10, 15, 20% wt). Prepared composite powders were cold pressed and sintered at 1100°C for 4 h. X-ray diffraction (XRD), scanning electron microscopy and transition electron microscopy techniques were used for phase analysis, crystallite size determination of FA and also for phase analysis and evaluation of particle distribution of composites. Bioactivity behavior of prepared nanocomposites was evaluated in simulated body fluid (SBF) for 1 up to 28 days.Materials and Methods:Co-Cr-Mo alloy (ASTM F75) powder was prepared and mixed in a planetary ball mill with different amounts of FA nanopowders (10, 15, 20% wt). Prepared composite powders were cold pressed and sintered at 1100°C for 4 h. X-ray diffraction (XRD), scanning electron microscopy and transition electron microscopy techniques were used for phase analysis, crystallite size determination of FA and also for phase analysis and evaluation of particle distribution of composites. Bioactivity behavior of prepared nanocomposites was evaluated in simulated body fluid (SBF) for 1 up to 28 days.Results:Results showed that nucleus of apatite were formed on the surface of the prepared CoA/FaNC during 1 up to 28 days immersion in the SBF solution. On the other hand, CoA/FaNC unlike Co-base alloy possessed bone-like apatite-formation ability.Conclusion:It was concluded that bioinert Co-Cr-Mo alloy could be successfully converted into bioactive nanocomposite by adding 10, 15, 20 wt% of FA nano particles.

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The effect of high-energy ball milling parameters on the preparation and characterization of fluorapatite nanocrystalline powder

Cited by 58 publications

References 38 publications

The Effect of the Two‐Step Sintering Process on Consolidation of Fluoridated Hydroxyapatite and its Mechanical Properties and Bioactivity

The Effect of the Two‐Step Sintering Process on Consolidation of Fluoridated Hydroxyapatite and its Mechanical Properties and Bioactivity

Solid-state MAS NMR, TEM, and TGA studies of structural hydroxyl groups and water in nanocrystalline apatites prepared by dry milling

Novel bioactive Co-based alloy/FA nanocomposite for dental applications

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