1 research outputs found
New Method for Extracting Diffusion-Controlled Kinetics from Differential Scanning Calorimetry: Application to Energetic Nanostructures
A new expression is derived for interpreting
differential scanning
calorimetry curves for solid-state reactions with diffusion-controlled
kinetics. The new form yields an analytic expression for temperature
at the maximum peak height that is similar to a Kissinger analysis,
but that explicitly accounts for laminar, cylindrical, and spherical
multilayer system geometries. This expression was used to analyze
two reactive multilayer nanolaminate systems, a Zr/CuO thermite and
an Ni/Al aluminide, that include systematically varied layer thicknesses.
This new analysis scales differential scanning calorimetry (DSC) peak
temperatures against sample geometry, which leads to geometry-independent
inherent activation energies and prefactors. For the Zr/CuO system,
the DSC data scale with the square of the bilayer thickness, while,
for the Ni/Al system, the DSC data scale with the thickness. This
suggests distinct reaction mechanisms between these systems