Curvature-Controlled Field Effect Enables Thermal Localization for Low-Temperature C─F Bond Activation

Area of Science:

• Physical Chemistry
• Materials Science
• Chemical Engineering

Background:

• Geometric singularities concentrate electric and optical fields.
• The role of curvature alone in localizing thermal energy for chemical kinetics is unresolved.

Purpose of the Study:

• Investigate if nanoscale curvature can localize thermal energy and influence chemical kinetics.
• Establish curvature-induced thermal localization as a mechanism linking geometry to reaction kinetics.

Main Methods:

• Experimental and computational studies using γ-Al2O3 architectures with varied curvature (nanoneedles, micro-needles, spheres).
• In situ infrared thermography to observe thermal hotspots.
• Operando vibrational spectroscopy to analyze reaction intermediates and kinetics.

Main Results:

• Observed curvature-dependent temperature localization up to ~30 °C at nanoneedle tips.
• Confirmed hotspot formation and enhanced water dissociation during CF4 decomposition.
• Reduced apparent activation energy, enabling complete CF4 decomposition at 580 °C.

Conclusions:

• Nanoscale curvature generates localized thermal fields that lower reaction barriers in heterogeneous catalysis.
• Curvature-induced thermal localization is a general physical mechanism linking geometry to interfacial energy density and reaction kinetics.
• Provides a universal design principle for activating strongly bound molecules.