Preparation of fibrous hydroxyapatite particles by homogeneous precipitation and microwave-assisted hydrothermal heating
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- Kuniya Ryuto
- Department of Materials and Life Sciences, Faculty of Science and Engineering, Sophia University
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- Sumi Takuya
- Department of Materials and Life Sciences, Faculty of Science and Engineering, Sophia University
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- Horikoshi Satoshi
- Department of Materials and Life Sciences, Faculty of Science and Engineering, Sophia University
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- Toyama Takeshi
- Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University
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- Itatani Kiyoshi
- Department of Materials and Life Sciences, Faculty of Science and Engineering, Sophia University
Abstract
Preparation conditions of fibrous hydroxyapatite (Ca10(PO4)6(OH)2: HAp) particles were examined by two-step chemical routes: (i) the preparation of fibrous octacalcium phosphate (Ca8H2(PO4)6・5H2O: OCP) particles by homogeneous precipitation, using 0.0333-0.0500 mol・dm-3 Ca(NO3)2, 0.0200-0.0300 mol・dm-3 (NH4)2HPO4, 0.04-0.40 mol・dm-3 urea ((NH2)2CO; precipitant) and conc. HNO3, and (ii) the microwave-assisted hydrothermal heating of OCP particles at 130°C for 1-3 h. The fibrous HAp particles with the mean long-axis length of 307 μm were obtained when the calcium phosphate solution containing 0.0333 mol・dm-3 Ca(NO3)2, 0.0200 mol・dm-3 (NH4)2HPO4 and 0.12 mol・dm-3 (NH2)2CO, was heated under flux at 80°C for 24 h, followed by the microwave-assisted hydrothermal heating at 130°C for 3 h. The mean long-axis length decreased down to 255 μm, after the heating under reflux and microwave-assisted hydrothermal heating of the calcium phosphate solution containing 0.050 mol・dm-3 Ca(NO3)2, 0.030 mol・dm-3 (NH4)2HPO4 and 0.20 mol・dm-3 (NH2)2CO. Instead, the microwave-assisted hydrothermal heating of OCP particles in the HAp-dissolved solution, i.e., the dissolution of HAp powder by bubbling CO2 gas, helped increasing the mean long-axis length to 437 μm.
Journal
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- Phosphorus Research Bulletin
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Phosphorus Research Bulletin 34 (0), 1-8, 2018
Japanese Association of Inorganic Phosphorus Chemistry
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Keywords
Details 詳細情報について
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- CRID
- 1390282680262708480
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- NII Article ID
- 130006398100
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- DOI
- 10.3363/prb.34.1
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- ISSN
- 18822363
- 09184783
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- Text Lang
- en
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed