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Title: Chemical Potential Driven Reorganization of Anions between Stern and Diffuse Layers at the Air/Water Interface

Journal Article · · Journal of Physical Chemistry. C

We report ion adsorption and transfer at charged interfaces play key roles in various industrial and environmental processes. Molecular scale details of ion-ion, ion-water, and ion-surface interactions are still debated. Complex ions, such as SCN- and SeCN-, are particularly interesting due to their unexpected adsorption trends. Here, we combine vibrational sum frequency generation (VSFG) spectroscopy and surface-sensitive synchrotron X-ray studies to provide a detailed description of SeCN- adsorption at a floating charged monolayer. Polarimetry studies show that the average orientation of SeCN- anions with respect to the surface normal decreases from 45° to 22° with the increasing KSeCN concentration. Interfacial SeCN- coverage saturates at very low bulk concentrations, but their orientational organization, distribution between Stern and diffuse layers, and effects on the hydrogen-bonding network of the interfacial water continue to change with increasing bulk KSeCN concentration. These results show that the increasing chemical potential may lead to further reorganization of the adsorbed ions, even though the total interfacial ion population does not change. The reorganization of the interfacial ions and the water may be very important in chemical separations of heavy metals, where metal-anion complexes drive the selective ion transfer at aqueous interfaces.

Research Organization:
Argonne National Laboratory (ANL), Lemont, IL (United States)
Sponsoring Organization:
USDOE Office of Science - Office of Basic Energy Sciences - Chemical Sciences, Geosciences, and Biosciences Division; National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1869204
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 2 Vol. 126; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (90)

Solvent Extraction: Structure of the Liquid–Liquid Interface Containing a Diamide Ligand journal March 2016
Dipole moments and rotational isomerism for organic thio- and selenocyanates journal January 1966
Liquid Surface X-Ray Scattering book June 2018
Sum-frequency vibrational spectroscopic studies of Langmuir monolayers journal June 2013
Investigations of the Hofmeister series and other specific ion effects using lipid model systems journal May 2017
Combined supramolecular and mesoscale modelling of liquid–liquid extraction of rare earth salts journal October 2018
Sum frequency generation vibrational spectroscopy (SFG-VS) for complex molecular surfaces and interfaces: Spectral lineshape measurement and analysis plus some controversial issues journal December 2016
Surface sum frequency generation spectroscopy on non-centrosymmetric crystal GaAs (001) journal October 2017
The Surface of Ice under Equilibrium and Nonequilibrium Conditions journal March 2019
Using Microemulsions: Formulation Based on Knowledge of Their Mesostructure journal May 2021
Thermodynamic Signatures of the Origin of Anti -Hofmeister Selectivity for Phosphate at Aqueous Interfaces journal May 2020
Molecular Anion Hydrogen Bonding Dynamics in Aqueous Solution journal October 2015
Specific Cation Effects on SCN in Bulk Solution and at the Air–Water Interface journal April 2018
Molecular Adsorption and Transport at Liposome Surfaces Studied by Molecular Dynamics Simulations and Second Harmonic Generation Spectroscopy journal August 2019
Synthesis and Characterization of a Chromo-Extractant to the Probe Liquid–Liquid Interface in a Solvent Extraction Process journal April 2020
Stern and Diffuse Layer Interactions during Ionic Strength Cycling journal August 2021
Determination of the Surface Charge Density of Colloidal Gold Nanoparticles Using Second Harmonic Generation journal June 2015
New Information on the Ion-Identity-Dependent Structure of Stern Layer Revealed by Sum Frequency Generation Vibrational Spectroscopy journal August 2016
Weakly Hydrogen-Bonded Water Inside Charged Lipid Monolayer Observed with Heterodyne-Detected Vibrational Sum Frequency Generation Spectroscopy journal January 2017
Direct Spectroscopic Measurement of Interfacial Electric Fields near an Electrode under Polarizing or Current-Carrying Conditions journal May 2017
Impacts of Salt, Buffer, and Lipid Nature on Molecular Adsorption and Transport in Liposomes As Observed by Second Harmonic Generation journal July 2017
Interfacial Structure and Electric Field Probed by in Situ Electrochemical Vibrational Stark Effect Spectroscopy and Computational Modeling journal August 2017
Two-Step Adsorption of PtCl 6 2– Complexes at a Charged Langmuir Monolayer: Role of Hydration and Ion Correlations journal November 2017
Effect of Halide Anions on the Structure and Dynamics of Water Next to an Alumina (0001) Surface journal May 2018
Heavy Anionic Complex Creates a Unique Water Structure at a Soft Charged Interface journal November 2018
Specific Ion Effects at the Interface of Nanometer-Sized Droplets in Water: Structure and Stability journal June 2019
Interactions of Na + Cations with a Highly Charged Fatty Acid Langmuir Monolayer: Molecular Description of the Phase Transition journal August 2019
The Role of Specific Ion Effects in Ion Transport: The Case of Nitrate and Thiocyanate journal December 2019
Anions Enhance Rare Earth Adsorption at Negatively Charged Surfaces journal May 2020
Role of Ions on the Surface-Bound Water Structure at the Silica/Water Interface: Identifying the Spectral Signature of Stability journal March 2021
Structure of Electric Double Layer under Cationic Langmuir Monolayer: Charge Condensation Effect journal March 2021
A New Imaginary Term in the Second-Order Nonlinear Susceptibility from Charged Interfaces journal June 2021
Charge-Transfer-to-Solvent Spectrum of Thiocyanate at the Air/Water Interface Measured by Broadband Deep Ultraviolet Electronic Sum Frequency Generation Spectroscopy journal August 2018
Polynuclear Speciation of Trivalent Cations near the Surface of an Electrolyte Solution journal May 2015
Molecular Scale Description of Anion Competition on Amine-Functionalized Surfaces journal October 2016
Specific Salt Effect on the Interaction between Rare Earth Ions and Trioctylphosphine Oxide Molecules at the Organic–Aqueous Two-Phase Interface: Experiments and Molecular Dynamics Simulations journal April 2018
Coming to Order: Adsorption and Structure of Nonionic Polymer at the Oil/Water Interface as Influenced by Cationic and Anionic Surfactants journal February 2020
Fluoroethylene Carbonate Induces Ordered Electrolyte Interface on Silicon and Sapphire Surfaces as Revealed by Sum Frequency Generation Vibrational Spectroscopy and X-ray Reflectivity journal February 2018
Hydrogen-Bond-Driven Chemical Separations: Elucidating the Interfacial Steps of Self-Assembly in Solvent Extraction journal June 2020
Origins of Clustering of Metalate–Extractant Complexes in Liquid–Liquid Extraction journal April 2021
Hofmeister Phenomena: An Update on Ion Specificity in Biology journal January 2012
Theoretical Studies of Structures and Vibrational Sum Frequency Generation Spectra at Aqueous Interfaces journal January 2014
Vibrational Sum Frequency Spectroscopy Studies of the Influence of Solutes and Phospholipids at Vapor/Water Interfaces Relevant to Biological and Environmental Systems journal January 2014
Biological Macromolecules at Interfaces Probed by Chiral Vibrational Sum Frequency Generation Spectroscopy journal January 2014
Liquid Interfaces Probed by Second-Harmonic and Sum-Frequency Spectroscopy journal January 1996
Adsorption and Reaction of CO 2 and SO 2 at a Water Surface journal March 2006
Heterodyne-Detected Vibrational Sum Frequency Generation Spectroscopy journal February 2008
Structure and Orientation of Water at Charged Lipid Monolayer/Water Interfaces Probed by Heterodyne-Detected Vibrational Sum Frequency Generation Spectroscopy journal August 2010
Interfacial Water Structure Associated with Phospholipid Membranes Studied by Phase-Sensitive Vibrational Sum Frequency Generation Spectroscopy journal August 2010
Three Distinct Water Structures at a Zwitterionic Lipid/Water Interface Revealed by Heterodyne-Detected Vibrational Sum Frequency Generation journal April 2012
Solvation of SCN - and SeCN - Anions in Hydrogen-Bonding Solvents journal January 1996
Probing Heterogeneous Charge Distributions at the α-Al 2 O 3 (0001)/H 2 O Interface journal July 2020
Role of Water in CaCO 3 Biomineralization journal January 2021
Ultrafast to Ultraslow Dynamics of a Langmuir Monolayer at the Air/Water Interface Observed with Reflection Enhanced 2D IR Spectroscopy journal November 2017
Vibrational Relaxation of CN Stretch of Pseudo-Halide Anions (OCN - , SCN - , and SeCN - ) in Polar Solvents journal October 2006
Oriented Thiocyanate Anions at the Air−Electrolyte Interface and Its Implications on Interfacial Water - A Vibrational Sum Frequency Spectroscopy Study journal March 2007
Effect of Interfacial Presence of Oriented Thiocyanate on Water Structure journal February 2008
Observation of a Rare Earth Ion–Extractant Complex Arrested at the Oil–Water Interface During Solvent Extraction journal August 2014
X-ray Studies of Interfacial Strontium–Extractant Complexes in a Model Solvent Extraction System journal October 2014
Specificity and Variation of Length Scale over Which Monovalent Halide Ions Neutralize a Charged Interface journal March 2015
Nitrile Groups as Vibrational Probes: Calculations of the CN Infrared Absorption Line Shape of Acetonitrile in Water and Tetrahydrofuran journal May 2008
Vibrational Sum Frequency Generation Spectroscopic Investigation of the Interaction of Thiocyanate Ions with Zwitterionic Phospholipid Monolayers at the Air−Water Interface journal November 2009
The Effect of Salt on the Water Structure at a Charged Solid Surface: Differentiating Second- and Third-order Nonlinear Contributions journal April 2011
From Conventional to Phase-Sensitive Vibrational Sum Frequency Generation Spectroscopy: Probing Water Organization at Aqueous Interfaces journal September 2012
Throwing Salt into the Mix: Altering Interfacial Water Structure by Electrolyte Addition journal December 2013
Beyond Hofmeister journal March 2014
Phase-referenced nonlinear spectroscopy of the α-quartz/water interface journal December 2016
Second-order spectral lineshapes from charged interfaces journal October 2017
Asymmetric response of interfacial water to applied electric fields journal June 2021
Mechanism of phase transfer of uranyl ions: a vibrational sum frequency generation spectroscopy study on solvent extraction in nuclear reprocessing journal January 2018
Specific counter-cation effect on the molecular orientation of thiocyanate anions at the aqueous solution interface journal January 2020
Ion-specific clustering of metal–amphiphile complexes in rare earth separations journal January 2020
Shedding light on water structure at air–aqueous interfaces: ions, lipids, and hydration
  • Allen, Heather C.; Casillas-Ituarte, Nadia N.; Sierra-Hernández, M. Roxana
  • Physical Chemistry Chemical Physics, Vol. 11, Issue 27 https://doi.org/10.1039/b901209e
journal January 2009
Quantitative analysis of orientational order in the molecular monolayer by surface second harmonic generation journal September 2003
X-ray fluorescence spectroscopy from ions at charged vapor/water interfaces journal April 2009
X-ray fluorescence from a model liquid/liquid solvent extraction system journal November 2011
Binding of trivalent ions on fatty acid Langmuir monolayer: Fe 3+ versus La 3+ journal October 2018
Adsorption of thiocyanate ions to the dodecanol/water interface characterized by UV second harmonic generation journal August 2009
Nanoscale view of assisted ion transport across the liquid–liquid interface journal March 2018
The Solvent Extraction of Rare-Earth Metals by Carboxylic Acids journal April 1992
Implementing the Theory of Sum Frequency Generation Vibrational Spectroscopy: A Tutorial Review journal May 2005
Mapping molecular orientation and conformation at interfaces by surface nonlinear optics journal May 1999
What x rays can tell us about the interfacial profile of water near hydrophobic surfaces journal July 2013
Unveiling Microscopic Structures of Charged Water Interfaces by Surface-Specific Vibrational Spectroscopy journal January 2016
Electrostatic Origin of Element Selectivity during Rare Earth Adsorption journal February 2019
Stochastic fitting of specular X-ray reflectivity data using StochFit journal November 2008
Anomalously low dielectric constant of confined water journal June 2018
Second Harmonic Generation, Sum Frequency Generation, and χ (3) : Dissecting Environmental Interfaces with a Nonlinear Optical Swiss Army Knife journal May 2009
X-Ray Reflectivity Studies of cPLA2α-C2 Domains Adsorbed onto Langmuir Monolayers of SOPC journal September 2005
Hydration layer structure at solid–water interfaces journal December 2014