Conduction properties of non-stoichiometric hydroxyapatite whiskers for biomedical use

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概要

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• Hydroxyapatite (HA) whiskers were synthesized by a hydrothermal method and ion conductive property was investigated in order to develop HA whisker electrets for biomedical utilization. Based on infrared (IR) spectroscopy and inductively coupled plasma optical emission spectrometry (ICP-OES), the obtained whiskers were assumed to be Ca deficient HA with a composition of Ca_<9.18>[HP0_4]_<0.82>[P0_4]_<5.18>[OH]_<1.18>・n H_2O. The results of complex impedance measurements proved that the conduction properties of whiskers and powders showed almost the same temperature dependence as those of sintered HA above 600℃. The mechanism is understood by the migration of protons originating in OH^- ions. In the temperature range below 600℃, however, the non-linear Arrhenius relationship of conductivity (σvs. 1/T) was only observed in the whiskers and powders. In particular, a drastic change in conductivity with temperature appeared in the whiskers within 250-600℃; the conductivity increased to 5.0 x 10^<-9> S/cm at 500℃, then decreased to 1.7 x 10^<-9> S/cm with the temperature elevated to 600℃. Since HPO_4^<2-> ions are reportedly supposed to convert into P2O_7^<4-> in almost the same temperature range where the drastic change in conductivity appeared, the increase in whisker conductivity up to 500℃ is presumably the result of an increase in the number of mobile protons generated from HPO_4^<2->. The subsequent decrease in conductivity seemed to be caused by a decrease in the number of protons achieved by water elimination, causing the conversion of HPO_4^<2-> to P_2O_7^<4->.

• 社団法人日本セラミックス協会の論文
• 2008-07-01

著者

• Tanaka Yumi

  Institute Of Biomaterials And Bioengineering Department Of Inorganic Materials Tokyo Medical And Den

• NAKAMURA Miho

  Department of Cardiology, Kitasato Institute Hospital, Kitasato University

• YAMASHITA Kimihiro

  Department of Pharmacology, Nagasaki University School of Medicine

• Tanaka Yumi

  Department of Inorganic Materials, Institute of Biomaterials and Bioengineering, Tokyo Medical and D

• NAGAI Akiko

  Department of Inorganic Materials, Institute of Biomaterials and Bioengineering, Tokyo Medical and D

• TAKATA Seik

  Department of Inorganic Materials, Institute of Biomaterials and Bioengineering, Tokyo Medical and D

• SHIMOE Kazuki

  Department of Inorganic Materials, Institute of Biomaterials and Bioengineering, Tokyo Medical and D

• TOYAMA Takeshi

  Department of Materials and Applied Chemistry, Faculty of Science and Engineering, Nihon University

• Takata Seik

  Department Of Inorganic Materials Institute Of Biomaterials And Bioengineering Tokyo Medical And Den

• Nagai Akiko

  Institute Of Biomaterials And Bioengineering Department Of Inorganic Materials Tokyo Medical And Den

• Nagai Akiko

  Department Of Anatomy Nihon University School Of Dentistry At Matsudo

• Shimoe Kazuki

  Department Of Inorganic Materials Institute Of Biomaterials And Bioengineering Tokyo Medical And Den

• Toyama Takeshi

  Department Of Materials And Applied Chemistry Faculty Of Science And Engineering Nihon University

• Yamashita Kimihiro

  Institute Of Biomaterials And Bioengineering Department Of Inorganic Materials Tokyo Medical And Den

• Yamashita Kimihiro

  Department Of Developmental Genetics (h2) Graduate School Of Medicine Chiba University

• Nakamura Miho

  Department Of Cardiology Kitasato Institute Hospital Kitasato University

• Takata Seiko

  Department of Inorganic Materials, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University

• TANAKA Yumi

  Department of Applied Chemistry, Faculty of Engineering, Kyushu University

• NAKAMURA Miho

  Department of Anesthesiology, Tohoku University School of Medicine

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