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| - Quantitative Thermodynamic Analysis of Sublimation Rates Using an Atomic ForceMicroscope
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| Abstract
| - Atomic force microscopy (AFM) has been successfully used to study the activation energy for evaporationof pentaerythritol tetranitrate (PETN) nanoislands formed by spin coating. These islands are annealedisothermally in the temperature range of 30−70 °C for a given time and are scanned with AFM in contactmode at room temperature. The volume of these islands does not change significantly up to about 35−40 °Cindicating that sublimation is not significant below 40 °C. Above 40 °C, the islands start shrinking, and therate of weight loss is analyzed as a function of temperature. The activation energy of evaporation using AFMwas found to be similar to that for bulk PETN crystals using thermogravimetric analysis (TGA) at highertemperatures (110−135 °C). These results demonstrate that AFM is a useful tool to measure thermodynamicproperties with a nanoscale probe.
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