Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Imaging Arrangements of Discrete Ions at Liquid–Solid Interfaces

Journal Article · · Nano Letters
 [1];  [2];  [1];  [1];  [3];  [3];  [2];  [4]
  1. Stanford Univ., CA (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Univ. of Maryland, College Park, MD (United States)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
The individual and collective behavior of ions near electrically charged interfaces is foundational to a variety of electrochemical phenomena encountered in biology, energy, and the environment. While many theories have been developed to predict the interfacial arrangements of counterions, direct experimental observations and validations have remained elusive. Utilizing cryo-electron microscopy, here we directly visualize individual counterions and reveal their discrete interfacial layering. Comparison with simulations suggests the strong effects of finite ionic size and electrostatic interactions. We also uncover correlated ionic structures under extreme confinement, with the channel widths approaching the ionic diameter (~1 nm). Finally, our work reveals the roles of ionic size, valency, and confinement in determining the structures of liquid–solid interfaces and opens up new opportunities to study such systems at the single-ion level.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515; SC0019112
OSTI ID:
1769350
Journal Information:
Nano Letters, Journal Name: Nano Letters Journal Issue: 11 Vol. 20; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (52)

DNA condensation by multivalent cations journal January 1997
Challenges Facing Lithium Batteries and Electrical Double-Layer Capacitors journal September 2012
Beyond Charge Balance: Counter‐Cations in Polyoxometalate Chemistry journal January 2020
The double-layer approach to promotion, electrocatalysis, electrochemical promotion, and metal–support interactions journal May 2003
Overview and future of single particle electron cryomicroscopy journal September 2015
Towards an understanding of induced-charge electrokinetics at large applied voltages in concentrated solutions journal November 2009
Counterion volume effects in mixed electrical double layers journal December 2007
Review on supercapacitors: Technologies and materials journal May 2016
Theory of the spatial resolution of (scanning) transmission electron microscopy in liquid water or ice layers journal April 2018
Cryo-electron microscopy of vitrified specimens journal May 1988
Theory of Surface Forces in Multivalent Electrolytes journal July 2019
Crowding and Anomalous Capacitance at an Electrode–Ionic Liquid Interface Observed Using Operando X-ray Scattering journal March 2016
Atomic- and Molecular-Resolution Mapping of Solid–Liquid Interfaces by 3D Atomic Force Microscopy journal November 2018
Ionic Liquids at Electrified Interfaces journal March 2014
Direct Imaging of the Ligand Monolayer on an Anion-Protected Metal Nanoparticle through Cryogenic Trapping of its Solution-State Structure journal December 2008
Polyoxometalates in Solution:  Molecular Dynamics Simulations on the α-PW 12 O 40 3- Keggin Anion in Aqueous Media journal February 2005
Breakdown of the Gouy−Chapman Model for Highly Charged Langmuir Monolayers:  Counterion Size Effect journal May 2006
Three-Dimensional Double Layers journal June 2014
Liquid Interfaces:  A Study by Sum-Frequency Vibrational Spectroscopy journal April 1999
Electric Double-Layer Structure in Primitive Model Electrolytes: Comparing Molecular Dynamics with Local-Density Approximations journal March 2015
Molecular layering of water at surfaces and origin of repulsive hydration forces journal November 1983
Materials for next-generation desalination and water purification membranes journal April 2016
Material design and engineering of next-generation flow-battery technologies journal November 2016
Unravelling biological macromolecules with cryo-electron microscopy journal September 2016
Cryo-EM structure of the open high-conductance Ca2+-activated K+ channel journal December 2016
Real-time molecular scale observation of crystal formation journal November 2016
Unravelling the electrochemical double layer by direct probing of the solid/liquid interface journal August 2016
Water-induced correlation between single ions imaged at the solid–liquid interface journal July 2014
Host–guest chemistry with water-soluble gold nanoparticle supraspheres journal November 2016
Self-assembled nanostructures in ionic liquids facilitate charge storage at electrified interfaces journal August 2019
Nanofluidics, from bulk to interfaces journal January 2010
Tip-enhanced Raman scattering journal January 2008
Exploring catalytic solid/liquid interfaces by in situ attenuated total reflection infrared spectroscopy journal January 2010
A simple density functional theory for inhomogeneous liquids: Wetting by gas at a solid-liquid interface journal July 1984
Fundamental measure theory for hard-sphere mixtures: a review journal January 2010
Steric effects in the dynamics of electrolytes at large applied voltages. I. Double-layer charging journal February 2007
Wigner-crystal formulation of strong-coupling theory for counterions near planar charged interfaces journal October 2011
Nanofluidics in the Debye Layer at Hydrophilic and Hydrophobic Surfaces journal September 2008
Double Layer in Ionic Liquids: Overscreening versus Crowding journal January 2011
Interfacial Layering in the Electric Double Layer of Ionic Liquids journal September 2020
Finite-Size Effects on the Closest Packing of Hard Spheres journal September 1997
Steric Effects in Electrolytes: A Modified Poisson-Boltzmann Equation journal July 1997
Microscopic Observation of Confinement-Induced Layering and Slow Dynamics of Dusty-Plasma Liquids in Narrow Channels journal June 2003
Colloquium : The physics of charge inversion in chemical and biological systems journal April 2002
Transport phenomena in nanofluidics journal July 2008
Molecular Layering of Fluorinated Ionic Liquids at a Charged Sapphire (0001) Surface journal October 2008
Ultrafast Optical Kerr Effect in Liquids and Solids journal November 1993
Cryo-EM structures of the human cation-chloride cotransporter KCC1 journal October 2019
A study of the decomposition behaviour of 12-tungstophosphate heteropolyacid in solution journal October 2003
Scanning Ion Conductance Microscopy journal July 2012
Scanning Electrochemical Microscopy journal July 2008
Synthesis, Structure, and Properties of Model Organic Surfaces journal October 1992

Similar Records

Single-Molecule Fluorescence Imaging of DNA at a Potential-Controlled Interface
Journal Article · Wed Jun 05 20:00:00 EDT 2013 · Langmuir · OSTI ID:2480677

Ion association at discretely-charged dielectric interfaces: Giant charge inversion [Dielectric response controlled ion association at physically heterogeneous surfaces: Giant charge reversal]
Journal Article · Mon Jul 10 20:00:00 EDT 2017 · Journal of Chemical Physics · OSTI ID:1399232

Specific ion effects at graphitic interfaces
Journal Article · Wed Oct 23 20:00:00 EDT 2019 · Nature Communications · OSTI ID:1633023