• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Preparation and Ion Exchange Property of Needlelike Hydroxyapatite controlled Ca/P Ratios

Research Project

Project/Area Number 07455348
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 無機工業化学
Research InstitutionNagoya Institute of Technology

Principal Investigator

SUZUKI Suguru  Nagoya Institute of Thechnology, Professor Ceramics Reserch Laboratory, 工学部, 教授 (50024287)

Co-Investigator(Kenkyū-buntansha) OZAWA Masakuni  Nagoya Institute of Thechnology, Associate Prof.Ceramics Reserch Laboratory, 工学部, 助教授 (30252315)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥7,600,000 (Direct Cost: ¥7,600,000)
Fiscal Year 1996: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1995: ¥6,000,000 (Direct Cost: ¥6,000,000)
KeywordsHydroxyapatite / Ca / P ratio / Doctor-Blade Method
Research Abstract

Needlelike HAps were synhthesized by a wet method for the present study. Aqueous solutions of CaCl_2 (A) and K_2HPO_4 (B) with a stoichiometric Ca/P molar ratio (1.67) were slowly and simultaneously dropped, with stirring, into water heated to -100゚C.The precipitated products were filtered with suction and dried at -100゚C for 24 to -48 h. After drying, the obtained particles were sintered at 1200゚C for 1 h.
Longer, needlelike particles of HAp were obtained at a slower dropping rate and in the range of the dilute A and B solutions (<0.3mol/dm^3). The needlelike particles were only nonstoichiometric or Ca-deficient HAps, with a Ca/P ratio of -1.54, as determined by inductively coupled plasma emission spectrometry (ICP). No stoichiometric, needlelike particles of HAp have yet reported.
A preparation of sintered, needle-like HAp filters for an ion-exchange was examined by a doctor blade method in order to facilitate handling in the strongly acidic region, with the following results :
(1) The best aqueous slurry for tape casting was the combination of HAp 20 mass%, binder 15 mass%, plasticizer 15 mass%, dispersant 1 mass% and water including specific amounts of Ca (OH) _2 or Ca (NO_3) _2.
(2) A shear thinning behavior appeared at all aqueous slurries.
(3) The tapes without cracks were obtained by sintering at 1200゚C for 1h after freeze-dried.
(4) The removal of Pb^<2+> ions was investigated by passing through the Pb^<2+> solutions into the sintered, needle-like HAp filters at pH2, and was -59% at the first run and reached to -100% after repeated 5 runs with the same procedure as before.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report

URL: 

Published: 1995-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi