Nanophase Particle Attributes
Semi-bulk and Bulk Quantities
Alfa Aesar, a leading supplier of research chemicals, metals and materials, and Nanophase Technologies, an industry-leading nanocrystalline materials innovator and manufacturer, have entered into a mutually exclusive partnership for the distribution of nanoparticles and nanoparticle dispersions. Alfa Aesar is the sole distributor of research and development quantities for a group of Nanophase materials. These select products are listed in this brochure. The materials are in stock at Alfa Aesar and available for immediate shipment. If there are materials of interest that are not listed, please feel free to contact Alfa Aesar for further discussion.
Nanocrystalline powders from Nanophase typically have a mean particle size less than 100 nm, are non-porous single crystals, have defined surface chemistry, and are chemically pure. Alfa Aesar offers nanoparticles in powder form and as stable, ready to use dispersions from Nanophase Technologies.
Nanoparticles are produced using one of two methods, Physical Vapor Synthesis (PVS) or NanoArc® Synthesis (NAS).
In the PVS process, arc energy is first applied to a solid metal precursor in order to generate a vapor at high temperature. A reactant gas is added to the vapor, which is then cooled at a controlled rate and condenses to form nanoparticles.
Like the PVS process, the NAS process uses arc energy to produce nanoparticles. The NAS process, however, is capable of using a wide variety of precursor formats and chemical compositions, thereby greatly expanding the number of materials that can be manufactured as nanopowders at commercial scale.
The nanomaterials produced by both the NAS and PVS processes consist of discreet, fully-dense, fully crystalline particles. The PVS process yields particles with the average sizes ranging from 35–75 nm and those from the NAS process range from 20–60 nm.
Nanoparticles can be surface treated to enable compatibility of the particles with a wide variety of fluids, resins and polymers. This patented technology ensures the appropriate surface treatment is applied to each individual particle, where the chemistry of the coating is selected to provide the characteristics required for compatibility. In this way, the nanoparticles retain their original chemistry and physical properties, but the coating can be tailored for a wide variety of applications and environments, including polar and non-polar organic systems.
Typical characteristics of nanophase materials include:
- Particles less than 100 nanometers
- Particles are equi-axed
- High surface and chemical purity
- Non porous and fully crystalline
- Near theoretical density
- No durable secondary agglomerate structures
In many cases, the successful application of nanoparticles in a particular application depends upon the ability to properly disperse the nanoparticles into a fluid. Application areas as diverse as cosmetics, coatings, polishing and catalysis all require that the particles are initially well dispersed and that the particles stay well dispersed (i.e. do not aggregate or “crash out” in the application environment) in order to exhibit their full activity. To meet this need, Nanophase has developed technology to permit the dispersion of its nanoparticles in water and a variety of polar and non-polar organic fluids. This technology provides a supply of concentrated, ready-to-use nanoparticle dispersions, eliminating the need for customers to disperse the nanoparticles themselves. This capability proves particularly attractive to customers who can benefit from Nanophase’s expertise in dispersing nanoparticles or wish to avoid handling dry powders.
Items are available from stock in the standard pack sizes listed. Stocks are also available for semi-bulk and bulk quantities. Please call for a quotation on a bulk or special order.
To request literature on nanoparticles and nanoparticle dispersions, please visit the Alfa Aesar website.
Source: Alfa Aesar
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