Nanoscale clusters requirements

A new model [109] for the deformation of glassy thermoplastics captures the behavior as a function of strain rate and temperature up to the yield point, based on a physical picture of a polymeric glass as a mosaic of nanoscale clusters of differing viscoelastic characteristics. It does not require computationally demanding simulations. It does, however, require a limited set of experimental stress-strain data to obtain values for its fitting parameters for a given material and to then allow both interpolations and extrapolations to be made to other testing conditions. 

Vapor technologies require the creahon of a vapor of atoms or atomic clusters that must be condensed and quenched to yield the desired size range of nanoscale particles. Whilst few restrictions exist in terms of compositional flexibility, the high temperatures needed to vaporize the precursor materials, the need to add coolants, and the difficult separation procedures involved render the process expensive, and may also impact on the agglomeration and purity of the product. 

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