| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Processing and Performance of Materials Using Microwaves, Electric and Magnetic Fields, Ultrasound, Lasers, and Mechanical Work: The Rustum Roy Symposium
|
| Presentation Title |
Characterizing the Kinetics of Isothermal Microwave-assisted Chemical Syntheses (IMACS): Application of a Unified Process Kinetic Equation (UPKE)
|
| Author(s) |
Boon Wong |
| On-Site Speaker (Planned) |
Boon Wong |
| Abstract Scope |
Rate-enhancement of any isothermal chemical (inorganic, organic, or polymeric) synthesis conducted under resonant microwaves (RM) versus the same process activated by conventional heating has been widely documented to be mainly attributable to reduction in activation enthalpy. This report applies a unified process kinetic equation (UPKE) to demonstrate and characterize the non-thermal effect (NTE) on kinetic enhancements measured from typical isothermal microwave-assisted chemical syntheses (IMACS). The UPKE, derived from meso-irreversible-thermodynamics, predicts that NTE occurring in any IMACS will significantly reduce activation energy/enthalpy, thereby enhancing the process-kinetics. Accordingly, IMACS-rate-enhancements are envisioned to result from a sequential RM-induced enthalpy variation: RM energy-input first promotes the total molar enthalpy of the irradiated reactants at temperature, which consequently stimulates a decrease in activation enthalpy of the process in favor of a kinetic enhancement. Lowering of the pre-exponential frequency factor observed in most IMACS is also rationalized as per the UPKE. |