发明名称 |
Method for preparing magnetic powder |
摘要 |
PCT No. PCT/JP88/00814 Sec. 371 Date Apr. 14, 1989 Sec. 102(e) Date Apr. 14, 1989 PCT Filed Aug. 18, 1988 PCT Pub. No. WO89/01521 PCT Pub. Date Feb. 23, 1989.The present invention relates to a method for preparing magnetic powder comprising homogeneous and fine particles using an alkali-producing enzyme. The object of the present invention is to provide a method suitable for preparing magnetic powder comprising relatively small particles, for instance, fine particles having a particle size ranging from 50 to 500 nm. The present invention relates to a method for preparing at least one member selected from the group consisting of iron oxides, iron hydroxides and iron oxyhydroxides which comprises the step of alkalizing a solution containing iron ions utilizing an alkali-producing enzyme and a substrate of the enzyme. According to the present invention, there can be produced magnetite (Fe3O4) and maghemite (gamma-Fe2O3) useful as magnetic powder as well as goethite (alpha-FeO(OH)), hematite (alpha-Fe2O3) and lepidocrocite (gamma-FeO(OH)) useful as the starting materials thereof. The magnetic powder can be used as the materials for magnetic recording and magnetic fluid; carriers for bioreactors; those for magnetic separation of cells and biopolymers; and those for microcarriers of medicines.
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申请公布号 |
US4945049(A) |
申请公布日期 |
1990.07.31 |
申请号 |
US19890343263 |
申请日期 |
1989.04.14 |
申请人 |
RESEARCH DEVELOPMENT CORPORATION;HAMAYA, TORU;HORIKOSHI, KOKI |
发明人 |
HAMAYA, TORU;HORIKOSHI, KOKI |
分类号 |
B03C1/01;C01G49/06;C01G49/08;C12P3/00;C22B3/18;G11B5/706;G11B5/714;H01F1/44 |
主分类号 |
B03C1/01 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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