Investigates thermal transformation behaviors of halloysite in relation to particle morphology, suggesting important implications for its thermal reactivity.
Key Points
The aim is to explore the effects of morphology on the thermal transformation of halloysite samples from various geological sources.
Used in situ x-ray absorption near-edge structure spectroscopy at Al and Si K-edges.
Conducted multivariate curve resolution alternating least squares analysis.
Investigated various morphological types of halloysite including nanotubes and spheroidal particles.
Thermal treatment triggers a phase transformation in Al coordination from octahedral to tetrahedral.
Spherical halloysite particles show intermediate transformation behaviors compared to tubular and kaolinite platelets.
Transformation onset temperatures vary based on the morphology of halloysite.