skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Dynamics of water confined in lyotropic liquid crystals: Molecular dynamics simulations of the dynamic structure factor

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4942471· OSTI ID:1433957

The properties of water under confinement are of practical and fundamental interest. Here in this work we study the properties of water in the self-assembled lyotropic phases of gemini surfactants with a focus on testing the standard analysis of quasi-elastic neutron scattering (QENS) experiments. In QENS experiments the dynamic structure factor is measured and fit to models to extract the translational diffusion constant, DT , and rotational relaxation time, τR. We test this procedure by using simulation results for the dynamic structure factor, extracting the dynamic parameters from the fit as is typically done in experiments, and comparing the values to those directly measured in the simulations. We find that the decoupling approximation, where the intermediate scattering function is assumed to be a product of translational and rotational contributions, is quite accurate. The jump-diffusion and isotropic rotation models, however, are not accurate when the degree of confinement is high. In particular, the exponential approximations for the intermediate scattering function fail for highly confined water and the values of DT and τR can differ from the measured value by as much as a factor of two. Other models have more fit parameters, however, and with the range of energies and wave-vectors accessible to QENS, the typical analysis appears to be the best choice. In the most confined lamellar phase, the dynamics are sufficiently slow that QENS does not access a large enough time scale and neutron spin echo measurements would be a valuable technique in addition to QENS.

Research Organization:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Contributing Organization:
Extreme Science and Engineering Discovery Environment (XSEDE); the UW-Madison chemistry department cluster; and the UW-Madison Center for High Throughput Computing (CHTC).
Grant/Contract Number:
SC0010328; TG-CHE090065; CHE-0840494
OSTI ID:
1433957
Alternate ID(s):
OSTI ID: 1239441; OSTI ID: 1341620
Report Number(s):
DOE-UWMadison-46938-2nd product; TRN: US1803026
Journal Information:
Journal of Chemical Physics, Vol. 144, Issue 8; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

References (56)

The Disk Chopper Spectrometer at NIST: a new instrument for quasielastic neutron scattering studies journal August 2003
Molecular Dynamics Simulations of Water Structure and Diffusion in Silica Nanopores journal May 2012
Water confined in MCM-41: a mode coupling theory analysis journal January 2012
Diffusive properties of water studied by incoherent quasi-elastic neutron scattering journal June 1994
Water DynamicsThe Effects of Ions and Nanoconfinement journal May 2008
Quasielastic neutron scattering investigation of motion of water molecules in n-propyl alcohol-water mixture journal February 2009
GROMACS 4:  Algorithms for Highly Efficient, Load-Balanced, and Scalable Molecular Simulation journal February 2008
Incoherent quasielastic neutron scattering from water in supercooled regime journal December 1982
Proton dynamics in supercooled water by molecular dynamics simulations and quasielastic neutron scattering journal March 1996
Molecular dynamics of liquid water probed by neutron scattering journal July 1991
Hydration Dynamics Near a Model Protein Surface journal March 2004
Quasielastic neutron scattering investigation of the pressure dependence of molecular motions in liquid water journal February 2006
Neutron Scattering Study and Dynamic Properties of Hydrogen-Bonded Liquids in Mesoscopic Confinement. 1. The Water Case journal October 2002
Slow dynamics of water molecules on the surface of a globular protein journal January 1996
Slow dynamics of supercooled water confined in nanoporous silica materials journal October 2004
Gaussian Model for Localized Translational Motion:  Application to Incoherent Neutron Scattering journal June 2006
Dynamics of Protein and its Hydration Water: Neutron Scattering Studies on Fully Deuterated GFP journal October 2012
Protein hydration in solution: Experimental observation by x-ray and neutron scattering journal March 1998
Water in Nonpolar Confinement: From Nanotubes to Proteins and Beyond journal May 2008
Influence of Ions on Water Diffusion—A Neutron Scattering Study journal June 2013
Interaction Models for Water in Relation to Protein Hydration book January 1981
Experimental determination of the nature of diffusive motions of water molecules at low temperatures journal March 1985
Single-particle dynamics of water molecules in confined space journal May 1995
Diffusive dynamics of water in tert-butyl alcohol/water mixtures journal March 2004
Molecular-dynamics study of incoherent quasielastic neutron-scattering spectra of supercooled water journal October 1997
Flexible simple point-charge water model with improved liquid-state properties journal January 2006
Dynamic Crossover in Supercooled Confined Water: Understanding Bulk Properties through Confinement journal January 2010
Translational and rotational dynamics of water in mesoporous silica materials: MCM-41-S and MCM-48-S journal August 2003
Anisotropic dynamics of water ultraconfined in macroscopically oriented channels of single-crystal beryl: A multifrequency analysis journal November 2013
Computing a Trust Region Step journal September 1983
Quasi-elastic neutron scattering study of dimethyl-sulfoxide–water mixtures: Probing molecular mobility in a nonideal solution journal January 2004
Self-Assembly of Gemini Surfactants: A Computer Simulation Study journal September 2012
Particle mesh Ewald: An N ⋅log( N ) method for Ewald sums in large systems journal June 1993
Structural dynamics of supercooled water from quasielastic neutron scattering and molecular simulations journal April 2011
Unusually Stable Aqueous Lyotropic Gyroid Phases from Gemini Dicarboxylate Surfactants journal September 2011
Liquid polymorphism: water in nanoconfined and biological environments journal June 2010
Molecular dynamics with coupling to an external bath journal October 1984
The high-flux backscattering spectrometer at the NIST Center for Neutron Research journal May 2003
Dynamics of water in confined space (porous alumina): QENS study journal August 2001
Nanoconfinement induced anomalous water diffusion inside carbon nanotubes journal January 2011
An improved GROMOS96 force field for aliphatic hydrocarbons in the condensed phase journal January 2001
Single particle slow dynamics of confined water journal January 2000
Model for the rotational contribution to quasielastic neutron scattering spectra from supercooled water journal April 2002
Model for single-particle dynamics in supercooled water journal June 1999
Water motion in reverse micelles studied by quasielastic neutron scattering and molecular dynamics simulations journal January 2004
Water dynamics in silica nanopores: The self-intermediate scattering functions journal June 2012
Settle: An analytical version of the SHAKE and RATTLE algorithm for rigid water models journal October 1992
A smooth particle mesh Ewald method journal November 1995
Incoherent Quasi-elastic Neutron Scattering from Fructose−Water Solutions journal August 2001
Diffusion Dynamics of Water Molecules in a LiCl Solution: A Low-Temperature Crossover journal October 2009
Dynamics of Water in Voids between Well-Defined and Densely Packed Spherical Nanocages Acting as Polyprotic Inorganic Acids journal May 2009
Single-particle dynamics of hydration water in protein journal June 1992
Structure of water nanoconfined between hydrophobic surfaces journal August 2005
An Investigation of Water Dynamics in Binary Mixtures of Water and Dimethyl Sulfoxide journal January 2008
Dynamics of hydrogen bonds: how to probe their role in the unusual properties of liquid water journal August 2006
Strong layering effects and anomalous dynamical behaviour in confined water at low hydration journal December 2002

Similar Records

Coupling between the Dynamics of Water and Surfactants in Lyotropic Liquid Crystals
Journal Article · Wed Apr 26 00:00:00 EDT 2017 · Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry · OSTI ID:1433957

Technical Report: Understanding Functional Lyotropic Liquid Crystal Network Phase Self-Assembly and the Properties of Nanoconfined Water
Technical Report · Tue Jan 31 00:00:00 EST 2017 · OSTI ID:1433957

Dynamics of Water in Gemini Surfactant-Based Lyotropic Liquid Crystals
Journal Article · Mon Sep 26 00:00:00 EDT 2016 · Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry · OSTI ID:1433957