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Title: Trends in mica–mica adhesion reflect the influence of molecular details on long-range dispersion forces underlying aggregation and coalignment

Abstract

Oriented attachment of nanocrystalline subunits is recognized as a common crystallization pathway that is closely related to formation of nanoparticle superlattices, mesocrystals, and other kinetically stabilized structures. Approaching particles have been observed to rotate to achieve co-alignment while separated by nanometer-scale solvent layers. Little is known about the forces that drive co-alignment, particularly in this “solvent-separated” regime. To obtain a mechanistic understanding of this process, we used atomic force microscopy-based dynamic force spectroscopy with tips fabricated from oriented mica to measure the adhesion forces between mica (001) surfaces in electrolyte solutions as a function of orientation, temperature, electrolyte type, and electrolyte concentration. The results reveal a ~60° periodicity as well as a complex dependence on electrolyte concentration and temperature. A continuum model that considers the competition between electrostatic repulsion and van der Waals attraction, augmented by microscopic details that include surface separation, water structure, ion hydration, and charge regulation at the interface, qualitatively reproduces the observed trends and implies that dispersion forces are responsible for establishing co-alignment in the solvent-separated state.

Authors:
ORCiD logo; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1368417
Alternate Identifier(s):
OSTI ID: 1415084
Report Number(s):
PNNL-SA-126659
Journal ID: ISSN 0027-8424; 49383; 49165; KC0203020
Grant/Contract Number:
AC05-76RL01830
Resource Type:
Journal Article: Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 114; Journal Issue: 29; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Environmental Molecular Sciences Laboratory

Citation Formats

Li, Dongsheng, Chun, Jaehun, Xiao, Dongdong, Zhou, Weijiang, Cai, Huacheng, Zhang, Lei, Rosso, Kevin M., Mundy, Christopher J., Schenter, Gregory K., and De Yoreo, James J.. Trends in mica–mica adhesion reflect the influence of molecular details on long-range dispersion forces underlying aggregation and coalignment. United States: N. p., 2017. Web. doi:10.1073/pnas.1621186114.
Li, Dongsheng, Chun, Jaehun, Xiao, Dongdong, Zhou, Weijiang, Cai, Huacheng, Zhang, Lei, Rosso, Kevin M., Mundy, Christopher J., Schenter, Gregory K., & De Yoreo, James J.. Trends in mica–mica adhesion reflect the influence of molecular details on long-range dispersion forces underlying aggregation and coalignment. United States. doi:10.1073/pnas.1621186114.
Li, Dongsheng, Chun, Jaehun, Xiao, Dongdong, Zhou, Weijiang, Cai, Huacheng, Zhang, Lei, Rosso, Kevin M., Mundy, Christopher J., Schenter, Gregory K., and De Yoreo, James J.. Wed . "Trends in mica–mica adhesion reflect the influence of molecular details on long-range dispersion forces underlying aggregation and coalignment". United States. doi:10.1073/pnas.1621186114.
@article{osti_1368417,
title = {Trends in mica–mica adhesion reflect the influence of molecular details on long-range dispersion forces underlying aggregation and coalignment},
author = {Li, Dongsheng and Chun, Jaehun and Xiao, Dongdong and Zhou, Weijiang and Cai, Huacheng and Zhang, Lei and Rosso, Kevin M. and Mundy, Christopher J. and Schenter, Gregory K. and De Yoreo, James J.},
abstractNote = {Oriented attachment of nanocrystalline subunits is recognized as a common crystallization pathway that is closely related to formation of nanoparticle superlattices, mesocrystals, and other kinetically stabilized structures. Approaching particles have been observed to rotate to achieve co-alignment while separated by nanometer-scale solvent layers. Little is known about the forces that drive co-alignment, particularly in this “solvent-separated” regime. To obtain a mechanistic understanding of this process, we used atomic force microscopy-based dynamic force spectroscopy with tips fabricated from oriented mica to measure the adhesion forces between mica (001) surfaces in electrolyte solutions as a function of orientation, temperature, electrolyte type, and electrolyte concentration. The results reveal a ~60° periodicity as well as a complex dependence on electrolyte concentration and temperature. A continuum model that considers the competition between electrostatic repulsion and van der Waals attraction, augmented by microscopic details that include surface separation, water structure, ion hydration, and charge regulation at the interface, qualitatively reproduces the observed trends and implies that dispersion forces are responsible for establishing co-alignment in the solvent-separated state.},
doi = {10.1073/pnas.1621186114},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 29,
volume = 114,
place = {United States},
year = {Wed Jul 05 00:00:00 EDT 2017},
month = {Wed Jul 05 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1073/pnas.1621186114

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