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Title: Fluid Behavior in Nanoporous Silica

Abstract

We investigate dynamics of water (H2O) and methanol (CH3OH and CH3OD) inside mesoporous silica materials with pore diameters of 4.0, 2.5, and 1.5 nm using low-field (LF) nuclear magnetic resonance (NMR) relaxometry. Experiments were conducted to test the effects of pore size, pore volume, type of fluid, fluid/solid ratio, and temperature on fluid dynamics. Longitudinal relaxation times (T1) and transverse relaxation times (T2) were obtained for the above systems. We observe an increasing deviation in confined fluid behavior compared to that of bulk fluid with decreasing fluid-to-solid ratio. Our results show that the surface area-to-volume ratio is a critical parameter compared to pore diameter in the relaxation dynamics of confined water. An increase in temperature for the range between 25 and 50°C studied did not influence T2 times of confined water significantly. However, when the temperature was increased, T1 times of water confined in both silica-2.5 nm and silica-1.5 nm increased, while those of water in silica-4.0 nm did not change. Reductions in both T1 and T2 values as a function of fluid-to-solid ratio were independent of confined fluid species studied here. The parameter T1/T2 indicates that H2O interacts more strongly with the pore walls of silica-4.0 nm than CH3OHmore » and CH3OD.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4]
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  1. The Ohio State Univ., Columbus, OH (United States). School of Earth Sciences
  2. The Ohio State Univ., Columbus, OH (United States). School of Earth Sciences; The Ohio State Univ., Columbus, OH (United States). Dept. of Chemistry
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Shull Wollan Center-A Joint Inst. for Neutron Sciences
  4. National Taiwan Univ., Taipei (Taiwan). Dept. of Chemistry
Publication Date:
Research Org.:
The Ohio State Univ., Columbus, OH (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
OSTI Identifier:
1815909
Grant/Contract Number:  
SC0006878
Resource Type:
Accepted Manuscript
Journal Name:
Frontiers in Chemistry
Additional Journal Information:
Journal Volume: 8; Journal ID: ISSN 2296-2646
Publisher:
Frontiers Research Foundation
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; low viscous fluids; confined state; relaxation; low-field NMR; subsurface

Citation Formats

Ok, Salim, Hwang, Bohyun, Liu, Tingting, Welch, Susan, Sheets, Julia M., Cole, David R., Liu, Kao-Hsiang, and Mou, Chung-Yuan. Fluid Behavior in Nanoporous Silica. United States: N. p., 2020. Web. doi:10.3389/fchem.2020.00734.
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Ok, Salim, Hwang, Bohyun, Liu, Tingting, Welch, Susan, Sheets, Julia M., Cole, David R., Liu, Kao-Hsiang, & Mou, Chung-Yuan. Fluid Behavior in Nanoporous Silica. United States. https://doi.org/10.3389/fchem.2020.00734
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Ok, Salim, Hwang, Bohyun, Liu, Tingting, Welch, Susan, Sheets, Julia M., Cole, David R., Liu, Kao-Hsiang, and Mou, Chung-Yuan. Fri . "Fluid Behavior in Nanoporous Silica". United States. https://doi.org/10.3389/fchem.2020.00734. https://www.osti.gov/servlets/purl/1815909.
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@article{osti_1815909,
title = {Fluid Behavior in Nanoporous Silica},
author = {Ok, Salim and Hwang, Bohyun and Liu, Tingting and Welch, Susan and Sheets, Julia M. and Cole, David R. and Liu, Kao-Hsiang and Mou, Chung-Yuan},
abstractNote = {We investigate dynamics of water (H2O) and methanol (CH3OH and CH3OD) inside mesoporous silica materials with pore diameters of 4.0, 2.5, and 1.5 nm using low-field (LF) nuclear magnetic resonance (NMR) relaxometry. Experiments were conducted to test the effects of pore size, pore volume, type of fluid, fluid/solid ratio, and temperature on fluid dynamics. Longitudinal relaxation times (T1) and transverse relaxation times (T2) were obtained for the above systems. We observe an increasing deviation in confined fluid behavior compared to that of bulk fluid with decreasing fluid-to-solid ratio. Our results show that the surface area-to-volume ratio is a critical parameter compared to pore diameter in the relaxation dynamics of confined water. An increase in temperature for the range between 25 and 50°C studied did not influence T2 times of confined water significantly. However, when the temperature was increased, T1 times of water confined in both silica-2.5 nm and silica-1.5 nm increased, while those of water in silica-4.0 nm did not change. Reductions in both T1 and T2 values as a function of fluid-to-solid ratio were independent of confined fluid species studied here. The parameter T1/T2 indicates that H2O interacts more strongly with the pore walls of silica-4.0 nm than CH3OH and CH3OD.},
doi = {10.3389/fchem.2020.00734},
journal = {Frontiers in Chemistry},
number = ,
volume = 8,
place = {United States},
year = {Fri Aug 28 00:00:00 EDT 2020},
month = {Fri Aug 28 00:00:00 EDT 2020}
}
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https://doi.org/10.3389/fchem.2020.00734
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