Infrared pump-probe study of nanoconfined water structure in reverse micelle

Jooyong Lee, Michał Maj, Kyungwon Kwak, Minhaeng Cho

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The influence of nanoconfinement on water structure is studied with time- and frequency-resolved vibrational spectroscopy of hydrazoic acid (HN3) encapsulated in reverse micelle. The azido stretch mode of HN3 is found to be a promising infrared probe for studying the structure and local hydrogen-bond environment of confined and interfacial water in reverse micelle due to its narrow spectral bandwidth and large transition dipole moment. The results show a clear separation between the core and shell spectral components, making it advantageous over the previously studied infrared probes. The measured vibrational lifetimes appear to be substantially different for the interfacial and bulk-like environments but show no remarkable size dependency, which indicates that water structures around this IR probe are distinctively different in the core and shell regions. The influence of local hydrogen bond network in the first and higher solvation shells on the vibrational dynamics of HN3 is further discussed.

Original languageEnglish
Pages (from-to)3404-3407
Number of pages4
JournalJournal of Physical Chemistry Letters
Volume5
Issue number19
DOIs
Publication statusPublished - 2014 Jan 1

ASJC Scopus subject areas

  • Materials Science(all)

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