News Column

Patent Issued for Composite Nanoparticles and Methods for Making the Same

August 27, 2014

By a News Reporter-Staff News Editor at Journal of Engineering -- According to news reporting originating from Alexandria, Virginia, by VerticalNews journalists, a patent by the inventors Che, Yong (Ann Arbor, MI); Murakami, Makoto (Ann Arbor, MI); Guo, Wei (Canton, MI), filed on January 3, 2011, was published online on August 12, 2014.

The assignee for this patent, patent number 8802234, is Imra America, Inc. (Ann Arbor, MI).

Reporters obtained the following quote from the background information supplied by the inventors: "In recent years, the intense research activities devoted to nanomaterials and their applications have led to development efforts aimed at achieving a wide variety of composite nanomaterials. It has been found that by finely mixing two or more materials or phases having different characteristics on a nanoscale, different properties, i.e. multifunctions, which are not attainable by either bulk composite material nor single phase nanomaterials, can be attained. Such composite materials, particularly nanoscale composites having portions with distinct material properties, are attractive for many applications. These multifunctional nanomaterials are particularly attractive for biological and biomedical applications, such as sensing, imaging, diagnosis, and therapeutics."

In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventors' summary information for this patent: "At least one embodiment provides for direct fabrication of composite fine particles, for example composite nanoparticles, in a liquid. At least a portion of the composite nanoparticles may then be collected from the liquid. Fabrication of a composite fine particle may be carried out without a requirement for preparation or dispersion of precursor nanoparticles in liquids and/or additional physical or chemical reactions, thereby providing for nanocomposite particle formation with a single processing/fabrication step.

"At least one embodiment provides a step of removing materials from a composite material target using an energy source such as a laser, preferably a pulsed laser.

"At least one embodiment provides a step of generation of composite particles at high temperature followed by quenching of the materials in a liquid, or in a plasma stream.

"At least one embodiment provides a method to generate composite nanoparticles in one step using ultrashort pulsed laser ablation.

"At least one embodiment provides a method to generate composite nanoparticles in one step, followed by collection of the composite nanoparticles in a liquid medium.

"In at least in one embodiment, composite nanoparticles may comprise a magnetic material and thus have ferromagnetic properties, such as Fe--Au and iron-platinum (Fe--Pt) composite particles. Composite nanoparticles having ferromagnetic properties may be collected by applying a magnetic field.

"By way of an example, UV-Visible spectra show that iron-gold (Fe--Au) composite nanoparticles collected in water exhibit a plasmon resonant peak from Au. The nanoparticles may be formed by ultrashort laser ablation, or by using another suitable energy source. The nanoparticles are then distributed in a liquid medium, for example mixed with thiolated polyethylene glycol (PEG-SH). The resultant product exhibits a plasmon resonant peak from Au. Thus, such composite nanoparticles can be used in exemplary applications such as: immunochromatography, surface enhanced Raman spectroscopy (SERS) activation, and coloring/labeling materials and other optical characterizations."

For more information, see this patent: Che, Yong; Murakami, Makoto; Guo, Wei. Composite Nanoparticles and Methods for Making the Same. U.S. Patent Number 8802234, filed January 3, 2011, and published online on August 12, 2014. Patent URL:

Keywords for this news article include: Nanoscale, Nanomaterial, Nanoparticle, Nanotechnology, Imra America Inc., Emerging Technologies.

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Source: Journal of Engineering

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