A Method for Encapsulation of Nanoparticles in Ionic Crystals

Previously, Purdue University researchers developed a process for preparing ultrafine ammonium perchlorate particles in which an aqueous solution of ammonium perchlorate was dispersed in an organic liquid for a water-in-oil emulsion. The emulsion is frozen and freeze dried to produce ultrafine particles. However, nanometric materials have not been widely accepted in some industries given their extremely small size presents significant challenges in such areas as handling, dispersion, safety, and ultimate strength.

Researchers at Purdue University have developed technology to mitigate these concerns by containing the nanomaterial inside micron-sized particles, allowing even dispersion and removing the influence of the nanoscale particle surface area on the polymeric binder, while still maintaining intimate contact between fuel and oxidizer particles. Therefore, this method retains the performance increase provided by nanoparticles. In addition, improved performance over current methods is expected as diffusional length scales for combustion will be decreased significantly, reducing the tendency for agglomeration and increasing efficiency.

Advantages:

-Alleviate concerns caused by agglomerate and high surface area

-Removes the influence of the nanoscale particle surface area on the polymeric binder

-Retain performance increase provided by nanoparticles

Potential Applications:

-Inclusion of nanoparticles in propellants

-Composite structures, cosmetics, pharmaceuticals, and energetic materials

TRL: 2

Intellectual Property:

Keywords: nanomaterial containment, micron-sized particles, ultrafine particles, ammonium perchlorate, polymeric binder, propellants, energetic materials, composite structures, particle dispersion, combustion efficiency, Aeronautics, Chemical Engineering, Crystallization, Mechanical Engineering, Nanoparticles, Polymers, Propellant