Nanoscale Dynamics of Water Confined in Ordered Mesoporous Carbon

Published

April 1, 2019

Author(s)

Kanae Ito, Antonio Faraone, Madhu Sudan Tyagi, Toshio Yamaguchi, Sow-Hsin Chen

Abstract

The single particle dynamics of water confined within an ordered mesoporous carbon matrix was investigated in the temperature range from 290 K to 170 K by quasielastic neutron scattering using three high resolution neutron spectrometers. Thus, it was possible to investigate the mobility of water confined in model hydrophobic microporous cavities at the nanoscale. Models developed for the nanoscale dynamics of supercooled water and water confined within hydrophilic matrices were able to describe the collected data but remarkable differences with analogous silica confining matrices were observed in these carbon samples. A significant fraction of the water molecules is immobile on the nanosecond timescale, even at room temperature. As the temperature is lowered, the mobility of the water molecules slows down, but the strongly non-Arrhenious behavior observed in bulk water and for fully hydrated hydrophilic confinement is absent, which indicates frustration of the hydrogen network formation. The obtained results are relevent for applications of mesoporous carbon materials.

Citation

Physical Chemistry Chemical Physics

Volume

21

Pub Type

Journals

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Citation

Ito, K. , Faraone, A. , Tyagi, M. , Yamaguchi, T. and Chen, S. (2019), Nanoscale Dynamics of Water Confined in Ordered Mesoporous Carbon, Physical Chemistry Chemical Physics, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=927301 (Accessed December 4, 2024)