Synthesis and Characterization of Magnetic Nanoparticles with High Magnetization and Good Oxidation Resistibility
Magnetic nanoparticles attract increasing attention because of their current and potential biomedical applications, such as, magnetically targeted and controlled drug delivery, magnetic hyperthermia and magnetic extraction. Increased magnetization can lead to improved performance in targeting and r...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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2004
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| Online Access: | http://hdl.handle.net/1721.1/7499 |
| _version_ | 1826213636870242304 |
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| author | Yu, Shi Chow, Gan-Moog |
| author_facet | Yu, Shi Chow, Gan-Moog |
| author_sort | Yu, Shi |
| collection | MIT |
| description | Magnetic nanoparticles attract increasing attention because of their current and potential biomedical applications, such as, magnetically targeted and controlled drug delivery, magnetic hyperthermia and magnetic extraction. Increased magnetization can lead to improved performance in targeting and retention in drug delivery and a higher efficiency in biomaterials extraction. We reported an approach to synthesize iron contained magnetic nanoparticles with high magnetization and good oxidation resistibility by pyrolysis of iron pentacarbonyl (Fe(CO)[subscript 5]) in methane (CH[subscript 4]). Using the high reactivity of Fe nanoparticles, decomposition of CH[subscript 4] on the Fe nanoparticles leads to the formation of nanocrystalline iron carbides at a temperature below 260°C. Structural investigation indicated that the as-synthesized nanoparticles contained crystalline bcc Fe, iron carbides and spinel iron oxide. The Mössbauer and DSC results testified that the as-synthesized nanoparticle contained three crystalline iron carbide phases, which converted to Fe[subscript 3]C after a heat treatment. Surface analysis suggested that the as-synthesized and subsequently heated iron-iron carbide particles were coated by iron oxide, which originated from oxidization of surface Fe atoms. The heat-treated nanoparticles exhibited a magnetization of 160 emu/g, which is two times of that of currently used spinel iron oxide nanoparticles. After heating in an acidic solution with a pH value of 5 at 60°C for 20 h, the nanoparticles retained 90 percentage of the magnetization. |
| first_indexed | 2024-09-23T15:52:25Z |
| format | Article |
| id | mit-1721.1/7499 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T15:52:25Z |
| publishDate | 2004 |
| record_format | dspace |
| spelling | mit-1721.1/74992019-04-10T21:48:42Z Synthesis and Characterization of Magnetic Nanoparticles with High Magnetization and Good Oxidation Resistibility Yu, Shi Chow, Gan-Moog magnetic nanoparticles pyrolysis FE(CO)5 CH4 iron nanoparticles FE3C Magnetic nanoparticles attract increasing attention because of their current and potential biomedical applications, such as, magnetically targeted and controlled drug delivery, magnetic hyperthermia and magnetic extraction. Increased magnetization can lead to improved performance in targeting and retention in drug delivery and a higher efficiency in biomaterials extraction. We reported an approach to synthesize iron contained magnetic nanoparticles with high magnetization and good oxidation resistibility by pyrolysis of iron pentacarbonyl (Fe(CO)[subscript 5]) in methane (CH[subscript 4]). Using the high reactivity of Fe nanoparticles, decomposition of CH[subscript 4] on the Fe nanoparticles leads to the formation of nanocrystalline iron carbides at a temperature below 260°C. Structural investigation indicated that the as-synthesized nanoparticles contained crystalline bcc Fe, iron carbides and spinel iron oxide. The Mössbauer and DSC results testified that the as-synthesized nanoparticle contained three crystalline iron carbide phases, which converted to Fe[subscript 3]C after a heat treatment. Surface analysis suggested that the as-synthesized and subsequently heated iron-iron carbide particles were coated by iron oxide, which originated from oxidization of surface Fe atoms. The heat-treated nanoparticles exhibited a magnetization of 160 emu/g, which is two times of that of currently used spinel iron oxide nanoparticles. After heating in an acidic solution with a pH value of 5 at 60°C for 20 h, the nanoparticles retained 90 percentage of the magnetization. Singapore-MIT Alliance (SMA) 2004-12-16T06:22:48Z 2004-12-16T06:22:48Z 2005-01 Article http://hdl.handle.net/1721.1/7499 en Molecular Engineering of Biological and Chemical Systems (MEBCS); 13595 bytes application/pdf application/pdf |
| spellingShingle | magnetic nanoparticles pyrolysis FE(CO)5 CH4 iron nanoparticles FE3C Yu, Shi Chow, Gan-Moog Synthesis and Characterization of Magnetic Nanoparticles with High Magnetization and Good Oxidation Resistibility |
| title | Synthesis and Characterization of Magnetic Nanoparticles with High Magnetization and Good Oxidation Resistibility |
| title_full | Synthesis and Characterization of Magnetic Nanoparticles with High Magnetization and Good Oxidation Resistibility |
| title_fullStr | Synthesis and Characterization of Magnetic Nanoparticles with High Magnetization and Good Oxidation Resistibility |
| title_full_unstemmed | Synthesis and Characterization of Magnetic Nanoparticles with High Magnetization and Good Oxidation Resistibility |
| title_short | Synthesis and Characterization of Magnetic Nanoparticles with High Magnetization and Good Oxidation Resistibility |
| title_sort | synthesis and characterization of magnetic nanoparticles with high magnetization and good oxidation resistibility |
| topic | magnetic nanoparticles pyrolysis FE(CO)5 CH4 iron nanoparticles FE3C |
| url | http://hdl.handle.net/1721.1/7499 |
| work_keys_str_mv | AT yushi synthesisandcharacterizationofmagneticnanoparticleswithhighmagnetizationandgoodoxidationresistibility AT chowganmoog synthesisandcharacterizationofmagneticnanoparticleswithhighmagnetizationandgoodoxidationresistibility |