Solid-State Synthesis of Iron Oxide Nanoparticles固相法合成氧化鐡纳米颗粒
- Summary
- Gamma Fe2O3 (maghemite), alpha Fe2O3 (hematite) and Fe3O4 (magnetite) are the three commonly used iron oxides. These iron oxides are known to have many important technological applications, including application in the field of clinical medicine and electronics. Two general methods for producing iron oxide aqueous dispersion have been used for long ages. The first one is to prepare dispersion by milling or so-called mechano-chemical processing which is suitable for large scale production. The second one is by chemical precipitation. However, these two methods have the disadvantages of either time-consuming or surfactant contamination which greatly decreases the economy and efficiency of production.
The present invention describes the preparation of iron oxide nano-particles in the form of surfactant-free aqueous dispersion as well as in the form of powder by salt-assisted solid state synthesis by solid-state reaction. Maghemite nanoparticles of sizes ranging from 1 to 5 nm which are well dispersed and with minimal aggregation can be produced. The dispersion can be used as a magnetic resonance image contrast and pigment. This approach can reduce the surfactant contamination and time of production.
The invention can be applied electronics like rotary shaft sealing for vacuum vessels, oscillation damping for various electronic instruments and position sensing for avionics, robotics, machine tool, and automotive as well as in medical field like diagnosis and drug delivery.
- Technology Benefits
- 1. Various size of maghemite nanoparticles can be made
2. Increase the economy and efficiency of production
- Technology Application
- - Oscillation damping for electronics instruments
- Positioning sensing for avionics, robotics, machine tool, automotive
- Diagnostic medicine
- Drug delivery
- Pigment and catalyst
- Supplementary Information
- Patent Number: US7892520B2
Application Number: US2007878864A
Inventor: Lu, Jun | Ng, Ka Ming | Yang, Shihe
Priority Date: 31 Jul 2006
Priority Number: US7892520B2
Application Date: 27 Jul 2007
Publication Date: 22 Feb 2011
IPC Current: C01G004902
US Class: 423634 | 423632 | 423633
Assignee Applicant: The Hong Kong University of Science & Technology
Title: Solid-state synthesis of iron oxide nanoparticles
Usefulness: Solid-state synthesis of iron oxide nanoparticles
Summary: For preparation of γ -Fe 2 O 3 nanoparticles and aqueous dispersion of γ -Fe 2 O 3 nanoparticles.
Novelty: Preparing gamma-ferrous oxide nanoparticles involves, grinding mixture of iron (II) and iron (III) hydrated salt, inorganic salt, alkali hydroxide to produces aqueous dispersion of gamma-ferrous oxide nanoparticles
- Industry
- Chemical/Material
- Sub Category
- Chemical/Material Application
- Application Date
- 27 Jul 2007
- Application No.
- US 11/878864
- Patent Information
- US 7892520
- ID No.
- TTC.PA.307S
- Country/Region
- Hong Kong
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