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Title: Hygroscopic Growth of Adsorbed Water Films on Smectite Clay Particles

Abstract

Hygroscopic growth of adsorbed water films on clay particles underlies a number of environmental science questions, from the air quality and climate impacts of mineral dust aerosols to the hydrology and mechanics of unsaturated soils and sedimentary rocks. Here, we use molecular dynamics (MD) simulations to establish the relation between adsorbed water film thickness (h) and relative humidity (RH) or disjoining pressure (Π), which has long been uncertain due to factors including sensitivity to particle shape, surface roughness, and aqueous chemistry. We present a new MD simulation approach that enables precise quantification of Π in films up to six water monolayers thick. We find that the hygroscopicity of phyllosilicate mineral surfaces increases in the order mica < K-smectite < Na-smectite. The relationship between Π and h on clay surfaces follows a double exponential decay with e-folding lengths of 2.3 and 7.5 Å. The two decay length scales are attributed to hydration repulsion and osmotic phenomena in the electrical double layer (EDL) at the clay–water interface.

Authors:
ORCiD logo [1]; ORCiD logo [2]
  1. Department of Civil and Environmental Engineering, Princeton University, Princeton, New Jersey 08544, United States
  2. Department of Civil and Environmental Engineering, Princeton University, Princeton, New Jersey 08544, United States, High Meadows Environmental Institute, Princeton University, Princeton, New Jersey 08544, United States
Publication Date:
Research Org.:
Princeton Univ., NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
2274869
Alternate Identifier(s):
OSTI ID: 2281644
Grant/Contract Number:  
SC0018419; AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Environmental Science and Technology
Additional Journal Information:
Journal Name: Environmental Science and Technology Journal Volume: 58 Journal Issue: 2; Journal ID: ISSN 0013-936X
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; MD simulations; clay minerals; water films; disjoining pressure; hygroscopic growth; dust aerosols; unsaturated soils

Citation Formats

Li, Xiaohan, and Bourg, Ian C. Hygroscopic Growth of Adsorbed Water Films on Smectite Clay Particles. United States: N. p., 2024. Web. doi:10.1021/acs.est.3c08253.
Li, Xiaohan, & Bourg, Ian C. Hygroscopic Growth of Adsorbed Water Films on Smectite Clay Particles. United States. https://doi.org/10.1021/acs.est.3c08253
Li, Xiaohan, and Bourg, Ian C. Tue . "Hygroscopic Growth of Adsorbed Water Films on Smectite Clay Particles". United States. https://doi.org/10.1021/acs.est.3c08253.
@article{osti_2274869,
title = {Hygroscopic Growth of Adsorbed Water Films on Smectite Clay Particles},
author = {Li, Xiaohan and Bourg, Ian C.},
abstractNote = {Hygroscopic growth of adsorbed water films on clay particles underlies a number of environmental science questions, from the air quality and climate impacts of mineral dust aerosols to the hydrology and mechanics of unsaturated soils and sedimentary rocks. Here, we use molecular dynamics (MD) simulations to establish the relation between adsorbed water film thickness (h) and relative humidity (RH) or disjoining pressure (Π), which has long been uncertain due to factors including sensitivity to particle shape, surface roughness, and aqueous chemistry. We present a new MD simulation approach that enables precise quantification of Π in films up to six water monolayers thick. We find that the hygroscopicity of phyllosilicate mineral surfaces increases in the order mica < K-smectite < Na-smectite. The relationship between Π and h on clay surfaces follows a double exponential decay with e-folding lengths of 2.3 and 7.5 Å. The two decay length scales are attributed to hydration repulsion and osmotic phenomena in the electrical double layer (EDL) at the clay–water interface.},
doi = {10.1021/acs.est.3c08253},
journal = {Environmental Science and Technology},
number = 2,
volume = 58,
place = {United States},
year = {Tue Jan 02 00:00:00 EST 2024},
month = {Tue Jan 02 00:00:00 EST 2024}
}

Journal Article:
Free Publicly Available Full Text
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https://doi.org/10.1021/acs.est.3c08253

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