An Experimental and Theoretical Investigation of the Formation of Hydroxyapatite Particles Prepared by an Electrochemical Method

Nur, Adrian; Setyawan, Heru

doi:10.1252/jcej.15we130

Cited by 19 publications

(8 citation statements)

References 18 publications

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“…10,11 With regard to these particular applications, the development of novel approaches to synthesize Hap using various Ca and P sources is now a vital task for researchers. Nevertheless, to expand the biomaterial research eld, a signicant number of procedures have been developed by scientists to synthesize Hap, such as wet chemical precipitation, 1,12,13 electrochemical methods, 14,15 solid-state reactions, 16 hydrothermal, 17,18 microemulsion, 19 sol-gel 20 and microwave irradiation 21 methods and so on. It must be mentioned here that the synthesis protocols strictly regulate the morphology and structural characteristics of Hap, which eventually control its biomedical applications.…”

Section: Introductionmentioning

confidence: 99%

UV-assisted synthesis of hydroxyapatite from eggshells at ambient temperature: cytotoxicity, drug delivery and bioactivity

et al. 2021

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Section: Introductionmentioning

confidence: 99%

UV-assisted synthesis of hydroxyapatite from eggshells at ambient temperature: cytotoxicity, drug delivery and bioactivity

et al. 2021

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“…This method requires the longer process. In another our work [18,19], we conclude that water reduction at cathode to produce hydroxide ions is very important process in HA formation. The problem in the electrochemical method is the concentration of OHions produced by water reduction difficult increase due they move away from the cathode and react with H + ions produced by water oxidation in the anode.…”

Section: Introductionmentioning

confidence: 60%

The Current Density on Electrosynthesis of Hydroxyapatite with Bipolar Membrane

et al. 2018

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Synthesis of hydroxyapatite by electrochemical method was has been successfully done. The novelty of this research is used of the bipolar membrane to separate electrolysis chamber. The bipolar membrane is used to keep the cations still around the cathode and react to form hydroxyapatite. The aim of this paper was to compare the current density on electrosynthesis of hydroxyapatite with and without bipolar membrane and the effect of current density on electrosynthesis. The electrosynthesis was performed at 2 hours at 400 to 600 mA/cm2 at room temperature. The bigger the current density, the more pure HA formed. The electrosynthesis of hydroxyapatite with bipolar membrane more effective than without bipolar membrane. The formation of HA is very effective in the cathode chamber. HA can be formed at low current density. In electrosynthesis with the bipolar membrane, particles of HA are nanosheet flower-like. The nanosheet flower-like HA growth at 1.6 A to 2 A.

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“…This observation is in accordance with previous work. 34,35 The overall process may be expressed as described by the following equations.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Although it was noticed that the OH − quantity increased around the cathode, the oxygen generation process was not elucidated in detail. 34,35 In this work, a new electrochemical sensor based on CaP transformation was prepared by in situ formation of ACP and OCP deposited on a Nafion-coated glassy carbon electrode (GCE) (denoted as CaPs/Nafion). The CaPs modified on the electrode can be viewed as the starting material for the transition to HAP, which was manifested by transmission electron microscopy (TEM) and Raman characterizations.…”

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confidence: 99%

Direct Electrochemical Sensing of Phosphate in Aqueous Solutions Based on Phase Transition of Calcium Phosphate

et al. 2020

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Electrochemical determination of phosphate in aqueous solutions attracts considerable interests in both biological and environmental fields. Because of the electrochemically inactive nature of phosphate, direct electrochemical detection of phosphate is still a highly challenging task. Herein, we reported a direct electrochemical approach for the determination of phosphate based on the oxidation of coordinated OH during the phase transition of calcium phosphates (CaPs). The mixture of amorphous CaPs and octacalcium phosphate (Ca8(HPO4)2(PO4)4·5H2O), which acts as the starting material for hydroxyapatite (Ca10(PO4)6(OH)2), was self-assembled on a Nafion-modified glassy carbon electrode. The as-prepared electrode (CaPs/Nafion) showed a distinct oxidation peak at 1.0 V versus Ag/AgCl in phosphate solution. The peak heights were directly proportional to the concentration of phosphate from 0.1 to 10 μM in the presence of 1 mM Ca2+. After comprehensive characterization of the CaPs/Nafion electrode, it was understood that phosphate ions as a proton acceptor could stimulate the generation of coordinated OH from coordinated water (H2O) in CaP. The addition of Ca2+ could magnify the coordinated H2O source because of its hydration to H2O. The CaPs/Nafion electrode also displayed good selectivity as the electrochemical oxidization response was not affected by up to 10 μM of potentially competitive species like CO3 2–, NO3 –, CH3COO–, SO4 2–, and Cl–. The results obtained in this work not only provided a new method for direct detection of phosphate in aqueous solution but also suggested that Ca2+ could be a promoter for electrochemical oxygen generation.

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An Experimental and Theoretical Investigation of the Formation of Hydroxyapatite Particles Prepared by an Electrochemical Method

Cited by 19 publications

References 18 publications

UV-assisted synthesis of hydroxyapatite from eggshells at ambient temperature: cytotoxicity, drug delivery and bioactivity

UV-assisted synthesis of hydroxyapatite from eggshells at ambient temperature: cytotoxicity, drug delivery and bioactivity

The Current Density on Electrosynthesis of Hydroxyapatite with Bipolar Membrane

Direct Electrochemical Sensing of Phosphate in Aqueous Solutions Based on Phase Transition of Calcium Phosphate

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