Pore-size dependent THz absorption of nano-confined water

Chi Kuang Sun, Borwen You, Yu Ru Huang, Kao Hsiang Liu, Shusaku Sato, Akiyoshi Irisawa, Motoki Imamura, Chung Yuan Mou

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


We performed a THz absorption spectroscopy study on liquid water confined in mesoporous silica materials, MCM-41-S-18 and MCM-41-S-21, of two different pore sizes at room temperatures. We found that stronger confinement with a smaller pore size causes reduced THz absorption, indicating reduced water mobility due to confinement. Combined with recent theoretical studies showing that the microscopic structure of water inside the nanopores can be separated into a core water region and an interfacial water region, our spectroscopy analysis further reveals a bulk-water-like THz absorption behavior in the core water region and a solid-like THz absorption behavior in the interfacial water region.

Original languageEnglish
Pages (from-to)2731-2734
Number of pages4
JournalOptics Letters
Issue number12
Publication statusPublished - 2015
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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