Formation of needle-like hydroxyapatite by hydrothermal treatment of CaHPO4·2H2O combined with β-Ca 3(PO4)2

Tomoko Watanabe; Giichiro Kawachi; Masanobu Kamitakahara; Koichi Kikuta; Chikara Ohtsuki

doi:10.2109/jcersj2.117.759

Formation of needle-like hydroxyapatite by hydrothermal treatment of CaHPO₄·2H₂O combined with β-Ca ₃(PO₄)₂

Tomoko Watanabe, Giichiro Kawachi, Masanobu Kamitakahara, Koichi Kikuta, Chikara Ohtsuki

ENV - Environmental Studies for Advanced Society

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

Conditions were investigated for preparing needle-like hydroxyapatite (HAp; Ca₁₀(PO₄)₆(OH)₂) by hydrothermal processing of mixed calcium phosphate powders consisting of dicalcium phosphate dihydrate (DCPD; CaHPO₄·2H₂O) and beta-tricalcium phosphate (β-TCP; β-Ca₃(PO₄)₂). The powder mixture was subjected to two-step hydrothermal processing in which the compacted powder was treated first by exposure to vapor of the liquid and subsequently by immersion in the liquid. High aspect ratios were obtained in samples with crystal sizes around 60 μm in length from the reactant mass ratio composition of β-TCP/DCPD = 1/9 by treatment at 160°C for 0.5 h under vapor conditions, followed by liquid conditions for 24 h with renewal of the liquid at 12 h. Initial compositions and pH conditions were the main parameters determining the formation of needle-like HAp by hydrothermal processing.

Original language	English
Pages (from-to)	759-764
Number of pages	6
Journal	Journal of the Ceramic Society of Japan
Volume	117
Issue number	1366
DOIs	https://doi.org/10.2109/jcersj2.117.759
Publication status	Published - 2009 Jun

Keywords

Dicalcium phosphate dihydrate
Hydrothermal processing
Hydroxyapatite
Needle-shaped crystal
Tricalcium phosphate

ASJC Scopus subject areas

Ceramics and Composites
Chemistry(all)
Condensed Matter Physics
Materials Chemistry

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title = "Formation of needle-like hydroxyapatite by hydrothermal treatment of CaHPO4·2H2O combined with β-Ca 3(PO4)2",

abstract = "Conditions were investigated for preparing needle-like hydroxyapatite (HAp; Ca10(PO4)6(OH)2) by hydrothermal processing of mixed calcium phosphate powders consisting of dicalcium phosphate dihydrate (DCPD; CaHPO4·2H2O) and beta-tricalcium phosphate (β-TCP; β-Ca3(PO4)2). The powder mixture was subjected to two-step hydrothermal processing in which the compacted powder was treated first by exposure to vapor of the liquid and subsequently by immersion in the liquid. High aspect ratios were obtained in samples with crystal sizes around 60 μm in length from the reactant mass ratio composition of β-TCP/DCPD = 1/9 by treatment at 160°C for 0.5 h under vapor conditions, followed by liquid conditions for 24 h with renewal of the liquid at 12 h. Initial compositions and pH conditions were the main parameters determining the formation of needle-like HAp by hydrothermal processing.",

keywords = "Dicalcium phosphate dihydrate, Hydrothermal processing, Hydroxyapatite, Needle-shaped crystal, Tricalcium phosphate",

author = "Tomoko Watanabe and Giichiro Kawachi and Masanobu Kamitakahara and Koichi Kikuta and Chikara Ohtsuki",

year = "2009",

month = jun,

doi = "10.2109/jcersj2.117.759",

language = "English",

volume = "117",

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journal = "Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan",

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number = "1366",

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AU - Watanabe, Tomoko

AU - Kawachi, Giichiro

AU - Kamitakahara, Masanobu

AU - Kikuta, Koichi

AU - Ohtsuki, Chikara

PY - 2009/6

Y1 - 2009/6

N2 - Conditions were investigated for preparing needle-like hydroxyapatite (HAp; Ca10(PO4)6(OH)2) by hydrothermal processing of mixed calcium phosphate powders consisting of dicalcium phosphate dihydrate (DCPD; CaHPO4·2H2O) and beta-tricalcium phosphate (β-TCP; β-Ca3(PO4)2). The powder mixture was subjected to two-step hydrothermal processing in which the compacted powder was treated first by exposure to vapor of the liquid and subsequently by immersion in the liquid. High aspect ratios were obtained in samples with crystal sizes around 60 μm in length from the reactant mass ratio composition of β-TCP/DCPD = 1/9 by treatment at 160°C for 0.5 h under vapor conditions, followed by liquid conditions for 24 h with renewal of the liquid at 12 h. Initial compositions and pH conditions were the main parameters determining the formation of needle-like HAp by hydrothermal processing.

AB - Conditions were investigated for preparing needle-like hydroxyapatite (HAp; Ca10(PO4)6(OH)2) by hydrothermal processing of mixed calcium phosphate powders consisting of dicalcium phosphate dihydrate (DCPD; CaHPO4·2H2O) and beta-tricalcium phosphate (β-TCP; β-Ca3(PO4)2). The powder mixture was subjected to two-step hydrothermal processing in which the compacted powder was treated first by exposure to vapor of the liquid and subsequently by immersion in the liquid. High aspect ratios were obtained in samples with crystal sizes around 60 μm in length from the reactant mass ratio composition of β-TCP/DCPD = 1/9 by treatment at 160°C for 0.5 h under vapor conditions, followed by liquid conditions for 24 h with renewal of the liquid at 12 h. Initial compositions and pH conditions were the main parameters determining the formation of needle-like HAp by hydrothermal processing.

KW - Dicalcium phosphate dihydrate

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KW - Needle-shaped crystal

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