Microgravimetric Analysis Method for Activation-Energy Extraction from Trace-Amount Molecule Adsorption

摘要

Activation-energy (E-a) value for trace-amount adsorption of gas molecules on material is rapidly and inexpensively obtained, for the first time, from a microgravimetric analysis experiment. With the material loaded, a resonant microcantilever is used to record in real time the adsorption process at two temperatures. The kinetic parameter E-a is thereby extracted by solving the Arrhenius equation. As an example, two CO2 'capture nanomaterials are examined by the E-a extracting method for evaluation/optimization and, thereby, demonstrating the applicability of the microgravimetric analysis method. The achievement helps to solve the absence in rapid quantitative characterization of sorption kinetics and opens a new route to investigate molecule adsorption processes and materials.