Study of the water dynamics near hydrophilic, nanostructured CuO surfaces by quasielastic and inelastic neutron scattering

James R. Torres; Zachary N. Buck; Helmut Kaiser; Eugene Mamontov; Madhusudan Tyagi; Flemming Y. Hansen; Kenneth W. Herwig; Luke Daemen; Michelle K. Kidder; Haskell Taub

doi:10.1063/5.0096948

Study of the water dynamics near hydrophilic, nanostructured CuO surfaces by quasielastic and inelastic neutron scattering

James R. Torres, Zachary N. Buck, Helmut Kaiser, Eugene Mamontov, Madhusudan Tyagi, Flemming Y. Hansen, Kenneth W. Herwig, Luke Daemen, Michelle K. Kidder, Haskell Taub

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

We have used quasielastic and inelastic neutron scattering to investigate the structure, dynamics, and phase transitions of water interacting with superhydrophilic CuO surfaces that not only possess a strong affinity for water but also a "grass-like"topography that is rough on both micro-and nanoscales. Here, we report quasielastic neutron scattering (QENS) measurements on two samples differing in water content at five temperatures below 280 K. The QENS spectra show water undergoing two different types of diffusive motion near the CuO surfaces: a "slow"translational diffusion occurring on a nanosecond time scale and a faster rotational motion. Further from the surfaces, there is "fast"translational diffusion comparable in rate to that of bulk supercooled water and the rotational motion occurring in the interfacial water. Analysis of the QENS spectra supports wetting of water to the CuO blades as seen in electron microscopy images. In addition, we observe an anomalous temperature dependence of the QENS spectra on cooling from 270 to 230 K with features consistent with a liquid-liquid phase transition. We suggest that the solvent-like properties of the coexisting bulk-like water in our CuO samples are a significant factor in determining the temperature dependence of the interfacial water's dynamics. Our results are compared with those obtained from two well-studied substrate classes: (1) silicas that contain ordered cylindrical nanopores but have weaker hydrophilicity and (2) nanoparticles of other transition-metal oxides, such as TiO2, which share the strong hydrophilicity of our samples but lack their porosity.

Original language	English
Article number	065124
Journal	AIP Advances
Volume	12
Issue number	6
DOIs	https://doi.org/10.1063/5.0096948
State	Published - Jun 1 2022

Funding

This work was supported by the U.S. National Science Foundation under Grant No. DGE-1069091 and the University of Missouri Research Reactor. Access to the HFBS was provided by the Center for High Resolution Neutron Scattering, a partnership between NIST and the NSF under Agreement No. DMR-2010792. J.R.T. was partially supported by a GO! Internship funded by Oak Ridge National Laboratory (ORNL). A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. Part of the electron microscopy work was supported by the University of Missouri Electron Microscopy Core’s Excellence in Microscopy award. We thank R. A. Winholtz, A. I. Kolesnikov, T. White, and H. B. Ma for helpful discussions.

Funders	Funder number
National Science Foundation	DGE-1069091, DMR-2010792
National Institute of Standards and Technology
Oak Ridge National Laboratory
University of Missouri

Access to Document

10.1063/5.0096948

Cite this

@article{269dea5ea510416abb8db091432cee67,

title = "Study of the water dynamics near hydrophilic, nanostructured CuO surfaces by quasielastic and inelastic neutron scattering",

abstract = "We have used quasielastic and inelastic neutron scattering to investigate the structure, dynamics, and phase transitions of water interacting with superhydrophilic CuO surfaces that not only possess a strong affinity for water but also a {"}grass-like{"}topography that is rough on both micro-and nanoscales. Here, we report quasielastic neutron scattering (QENS) measurements on two samples differing in water content at five temperatures below 280 K. The QENS spectra show water undergoing two different types of diffusive motion near the CuO surfaces: a {"}slow{"}translational diffusion occurring on a nanosecond time scale and a faster rotational motion. Further from the surfaces, there is {"}fast{"}translational diffusion comparable in rate to that of bulk supercooled water and the rotational motion occurring in the interfacial water. Analysis of the QENS spectra supports wetting of water to the CuO blades as seen in electron microscopy images. In addition, we observe an anomalous temperature dependence of the QENS spectra on cooling from 270 to 230 K with features consistent with a liquid-liquid phase transition. We suggest that the solvent-like properties of the coexisting bulk-like water in our CuO samples are a significant factor in determining the temperature dependence of the interfacial water's dynamics. Our results are compared with those obtained from two well-studied substrate classes: (1) silicas that contain ordered cylindrical nanopores but have weaker hydrophilicity and (2) nanoparticles of other transition-metal oxides, such as TiO2, which share the strong hydrophilicity of our samples but lack their porosity.",

author = "Torres, {James R.} and Buck, {Zachary N.} and Helmut Kaiser and Eugene Mamontov and Madhusudan Tyagi and Hansen, {Flemming Y.} and Herwig, {Kenneth W.} and Luke Daemen and Kidder, {Michelle K.} and Haskell Taub",

note = "Publisher Copyright: {\textcopyright} 2022 Author(s).",

year = "2022",

month = jun,

day = "1",

doi = "10.1063/5.0096948",

language = "English",

volume = "12",

journal = "AIP Advances",

issn = "2158-3226",

publisher = "American Institute of Physics",

number = "6",

}

TY - JOUR

T1 - Study of the water dynamics near hydrophilic, nanostructured CuO surfaces by quasielastic and inelastic neutron scattering

AU - Torres, James R.

AU - Buck, Zachary N.

AU - Kaiser, Helmut

AU - Mamontov, Eugene

AU - Tyagi, Madhusudan

AU - Hansen, Flemming Y.

AU - Herwig, Kenneth W.

AU - Daemen, Luke

AU - Kidder, Michelle K.

AU - Taub, Haskell

PY - 2022/6/1

Y1 - 2022/6/1

N2 - We have used quasielastic and inelastic neutron scattering to investigate the structure, dynamics, and phase transitions of water interacting with superhydrophilic CuO surfaces that not only possess a strong affinity for water but also a "grass-like"topography that is rough on both micro-and nanoscales. Here, we report quasielastic neutron scattering (QENS) measurements on two samples differing in water content at five temperatures below 280 K. The QENS spectra show water undergoing two different types of diffusive motion near the CuO surfaces: a "slow"translational diffusion occurring on a nanosecond time scale and a faster rotational motion. Further from the surfaces, there is "fast"translational diffusion comparable in rate to that of bulk supercooled water and the rotational motion occurring in the interfacial water. Analysis of the QENS spectra supports wetting of water to the CuO blades as seen in electron microscopy images. In addition, we observe an anomalous temperature dependence of the QENS spectra on cooling from 270 to 230 K with features consistent with a liquid-liquid phase transition. We suggest that the solvent-like properties of the coexisting bulk-like water in our CuO samples are a significant factor in determining the temperature dependence of the interfacial water's dynamics. Our results are compared with those obtained from two well-studied substrate classes: (1) silicas that contain ordered cylindrical nanopores but have weaker hydrophilicity and (2) nanoparticles of other transition-metal oxides, such as TiO2, which share the strong hydrophilicity of our samples but lack their porosity.

AB - We have used quasielastic and inelastic neutron scattering to investigate the structure, dynamics, and phase transitions of water interacting with superhydrophilic CuO surfaces that not only possess a strong affinity for water but also a "grass-like"topography that is rough on both micro-and nanoscales. Here, we report quasielastic neutron scattering (QENS) measurements on two samples differing in water content at five temperatures below 280 K. The QENS spectra show water undergoing two different types of diffusive motion near the CuO surfaces: a "slow"translational diffusion occurring on a nanosecond time scale and a faster rotational motion. Further from the surfaces, there is "fast"translational diffusion comparable in rate to that of bulk supercooled water and the rotational motion occurring in the interfacial water. Analysis of the QENS spectra supports wetting of water to the CuO blades as seen in electron microscopy images. In addition, we observe an anomalous temperature dependence of the QENS spectra on cooling from 270 to 230 K with features consistent with a liquid-liquid phase transition. We suggest that the solvent-like properties of the coexisting bulk-like water in our CuO samples are a significant factor in determining the temperature dependence of the interfacial water's dynamics. Our results are compared with those obtained from two well-studied substrate classes: (1) silicas that contain ordered cylindrical nanopores but have weaker hydrophilicity and (2) nanoparticles of other transition-metal oxides, such as TiO2, which share the strong hydrophilicity of our samples but lack their porosity.

UR - http://www.scopus.com/inward/record.url?scp=85133688137&partnerID=8YFLogxK

U2 - 10.1063/5.0096948

DO - 10.1063/5.0096948

M3 - Article

AN - SCOPUS:85133688137

SN - 2158-3226

VL - 12

JO - AIP Advances

JF - AIP Advances

IS - 6

M1 - 065124

ER -

Study of the water dynamics near hydrophilic, nanostructured CuO surfaces by quasielastic and inelastic neutron scattering

Abstract

Funding

Access to Document

Other files and links

Fingerprint

Cite this