Onset detection of solid-state phase transition in estrogen-like chemical via terahertz transmission spectroscopy

• Main Authors: Quema, Alex, Goto, Masahiro, Sakai, Masahiro, Ouenzerfi, Riadh El, Takahashi, Hiroshi, Murakami, Hidetoshi, Ono, Shingo, Sarukura, Nobuhiko, Janairo, Gerardo C.
• Format: text
• Published: Animo Repository 2004
• Subjects: Submillimeter waves; Phase transformations (Statistical physics); Atomic, Molecular and Optical Physics
• Online Access: https://animorepository.dlsu.edu.ph/faculty_research/3266
• Institution: De La Salle University

Solid-state phase transition onset in an endocrine-disrupting estrogen-like chemical (1,4-naphthol) is detected using terahertz transmission spectroscopy. The appearance of two absorption peaks and the sudden upsurge of terahertz-radiation power at 210 K indicate the onset of the solid-state phase transition. Differential scanning microscopy reveals a first-order phase transition at around 240 K while temperature-dependent x-ray diffraction analysis shows the occurrence of such phenomenon also at around 240 K. This demonstrates the sensitivity of the terahertz spectroscopic technique to phase transition since it provides a signal before such phenomenon actually occurs. © 2004 American Institute of Physics.