Process for agglomeration and densification of nanometre-sized particles


The present invention relates to the agglomeration and densification of nanoparticles powders or particles of nanometric scale sizes that can be produced by any kind of technique. More particularly, the present invention relates to densification of nanoparticles into micrometric particles. The primary processing operation is milling.

Technology transfer

This technology is available for licensing, or for further development through a collaborative research agreement with NRC. The business opportunity may be referred to by its NRC ID # 11456

Market applications

Proven to be pertinent to real industrial applications of any industry that is involved with nanotechnology, this innovation is particularly useful in the automotive and marine, environmental protection, electronics, cosmetics, health, textiles, and information technology sectors. It relates to taking nano-sized particles (one billionth of a metre) converting them to micrometre particles (one millionth of a metre) and using the properties of the resulting formation in various products.

How it works

Nanoparticle research is currently an area of intense scientific interest due to a wide variety of potential applications. Nanoparticles may be created using several methods. Some of them may occur in nature as well. While some methods are bottom up, some are called top down. Top down methods involve breaking the larger materials into nanoparticles. Milling/attrition methods include methods by which macro or micro scale particles are ground in a ball mill or a planetary ball mill, or other size-reducing mechanisms. The process involves binderless ball-milling of nanoparticles. The produced nanosized particles are agglomerated into powders having a micrometric particle size distribution. This conditioning is very useful to convert the particles for applications like thermal spraying or any other application requiring good flowability. This is also effective for avoiding manipulation of fine particle powders that are otherwise very reactive due to their high surface area. One of the primary limitations with nanoparticles is that nanoscale particles cannot be processed directly in many applications such as thermal spraying because of the extremely low density and flowability. One object of the present invention is to provide an improved process for consolidation of nanoparticle powders thus enabling manipulation by standard powder handling techniques eliminating the need for post processing.


  • Almost any element can be used in the process
  • Does not produce any potentially toxic residues
  • The process does not increase the grain size of the agglomerated particles


NRC file 11456

Patents granted in United States

Patent granted in Canada


To inquire about this technology, please contact:

David Fraser, Business Advisor
Telephone: 613-991-9972

Express Licensing

NRC makes research & development licenses for this technology available under its Express Licensing program. To purchase such a license, please complete the Express Licensing order form.

Date modified: