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Title: Hydration level dependence of the microscopic dynamics of water adsorbed in ultramicroporous carbon

Abstract

Even when not functionalized intentionally, most carbon materials are not hydrophobic and readily adsorb water molecules from atmospheric water vapor. We have equilibrated an ultramicroporous carbon at several levels of relative humidity, thereby attaining various hydration levels. The water molecules were adsorbed on the pore walls (but did not fill completely the pore volume) and thus could be better described as hydration, or surface, rather than confined, water. We used quasielastic neutron scattering to perform a detailed investigation of the dependence of microscopic dynamics of these adsorbed water species on the hydration level and temperature. The behavior of hydration water in ultramicroporous carbon clearly demonstrates the same universal traits that characterize surface (hydration) water in other materials that are surface-hydrated. In addition, unless special treatment is intentionally applied to ultramicroporous carbon, the species filling its pores in various applications, ranging from hydrogen molecules to electrolytes, likely find themselves in contact with non-freezing water molecules characterized by rich microscopic dynamics.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1330525
Alternate Identifier(s):
OSTI ID: 1396842
Grant/Contract Number:  
AC05-00OR22725; AC05- 00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Carbon
Additional Journal Information:
Journal Volume: 111; Journal Issue: C; Journal ID: ISSN 0008-6223
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Mamontov, Eugene, Yue, Yanfeng, Bahadur, Jitendra, Guo, Junjie, Contescu, Cristian I., Gallego, Nidia C., and Melnichenko, Yuri B. Hydration level dependence of the microscopic dynamics of water adsorbed in ultramicroporous carbon. United States: N. p., 2016. Web. doi:10.1016/j.carbon.2016.10.052.
Mamontov, Eugene, Yue, Yanfeng, Bahadur, Jitendra, Guo, Junjie, Contescu, Cristian I., Gallego, Nidia C., & Melnichenko, Yuri B. Hydration level dependence of the microscopic dynamics of water adsorbed in ultramicroporous carbon. United States. https://doi.org/10.1016/j.carbon.2016.10.052
Mamontov, Eugene, Yue, Yanfeng, Bahadur, Jitendra, Guo, Junjie, Contescu, Cristian I., Gallego, Nidia C., and Melnichenko, Yuri B. 2016. "Hydration level dependence of the microscopic dynamics of water adsorbed in ultramicroporous carbon". United States. https://doi.org/10.1016/j.carbon.2016.10.052. https://www.osti.gov/servlets/purl/1330525.
@article{osti_1330525,
title = {Hydration level dependence of the microscopic dynamics of water adsorbed in ultramicroporous carbon},
author = {Mamontov, Eugene and Yue, Yanfeng and Bahadur, Jitendra and Guo, Junjie and Contescu, Cristian I. and Gallego, Nidia C. and Melnichenko, Yuri B.},
abstractNote = {Even when not functionalized intentionally, most carbon materials are not hydrophobic and readily adsorb water molecules from atmospheric water vapor. We have equilibrated an ultramicroporous carbon at several levels of relative humidity, thereby attaining various hydration levels. The water molecules were adsorbed on the pore walls (but did not fill completely the pore volume) and thus could be better described as hydration, or surface, rather than confined, water. We used quasielastic neutron scattering to perform a detailed investigation of the dependence of microscopic dynamics of these adsorbed water species on the hydration level and temperature. The behavior of hydration water in ultramicroporous carbon clearly demonstrates the same universal traits that characterize surface (hydration) water in other materials that are surface-hydrated. In addition, unless special treatment is intentionally applied to ultramicroporous carbon, the species filling its pores in various applications, ranging from hydrogen molecules to electrolytes, likely find themselves in contact with non-freezing water molecules characterized by rich microscopic dynamics.},
doi = {10.1016/j.carbon.2016.10.052},
url = {https://www.osti.gov/biblio/1330525}, journal = {Carbon},
issn = {0008-6223},
number = C,
volume = 111,
place = {United States},
year = {Thu Oct 20 00:00:00 EDT 2016},
month = {Thu Oct 20 00:00:00 EDT 2016}
}

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Cited by: 13 works
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Works referencing / citing this record:

Nanoscale dynamics of water confined in ordered mesoporous carbon
journal, January 2019