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Title: Proton Traffic Jam: Effect of Nanoconfinement and Acid Concentration on Proton Hopping Mechanism

Journal Article · · Angewandte Chemie (International Edition)
 [1];  [2];  [2];  [1];  [1]; ORCiD logo [1];  [3]
  1. Lehrstuhl für Physkalische Chemie II Ruhr Universität Bochum 44801 Bochum Germany
  2. Chemical Sciences Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA, Kenneth S. Pitzer Center for Theoretical Chemistry University of California Berkeley California 94720 USA, Department of Chemistry University of California Berkeley California 94720 USA
  3. Chemical Sciences Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA, Kenneth S. Pitzer Center for Theoretical Chemistry University of California Berkeley California 94720 USA, Department of Chemistry University of California Berkeley California 94720 USA, Department of Chemical and Biomolecular Engineering University of California Berkeley California 94720 USA, Department of Bioengineering University of California Berkeley California 94720 USA

Abstract The properties of the water network in concentrated HCl acid pools in nanometer‐sized reverse nonionic micelles were probed with TeraHertz absorption, dielectric relaxation spectroscopy, and reactive force field simulations capable of describing proton hopping mechanisms. We identify that only at a critical micelle size of W 0 =9 do solvated proton complexes form in the water pool, accompanied by a change in mechanism from Grotthuss forward shuttling to one that favors local oscillatory hopping. This is due to a preference for H + and Cl ions to adsorb to the micelle interface, together with an acid concentration effect that causes a “traffic jam” in which the short‐circuiting of the hydrogen‐bonding motif of the hydronium ion decreases the forward hopping rate throughout the water interior even as the micelle size increases. These findings have implications for atmospheric chemistry, biochemical and biophysical environments, and energy materials, as transport of protons vital to these processes can be suppressed due to confinement, aggregation, and/or concentration.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
German Research Foundation (DFG); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1824239
Journal Information:
Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 48 Vol. 60; ISSN 1433-7851
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

References (72)

The Hydrated Excess Proton in the Zundel Cation H 5 O 2 + : The Role of Ultrafast Solvent Fluctuations journal July 2016
Untersuchung von Ionenhydratation und Ionenpaarbildung mittels THz‐Spektroskopie journal November 2018
The Hydrated Excess Proton in the Zundel Cation H 5 O 2 + : The Role of Ultrafast Solvent Fluctuations journal July 2016
Ion Hydration and Ion Pairing as Probed by THz Spectroscopy journal March 2019
Proton Transfer 200 Years after von Grotthuss: Insights from Ab Initio Simulations journal September 2006
The Grotthuss mechanism journal October 1995
The impact of organic coatings on light scattering by sodium chloride particles journal August 2011
Combining THz spectroscopy and MD simulations to study protein-hydration coupling journal September 2010
Direct Determination of Aerosol pH: Size-Resolved Measurements of Submicrometer and Supermicrometer Aqueous Particles journal September 2018
Protons and Hydroxide Ions in Aqueous Systems journal April 2016
Water Dynamics in the Hydration Shells of Biomolecules journal March 2017
Interfacial Structure and Partitioning of Nitrate Ions in Reverse Micelles journal December 2018
Understanding and Tracking the Excess Proton in Ab Initio Simulations; Insights from IR Spectra journal June 2020
Picosecond Proton Transfer Kinetics in Water Revealed with Ultrafast IR Spectroscopy journal February 2018
Surface pH and Ion Affinity at the Alcohol-Monolayer/Water Interface Studied by Sum-Frequency Spectroscopy journal July 2016
A Reactive Force Field with Coarse-Grained Electrons for Liquid Water journal October 2020
Correlations in the Solute–Solvent Dynamics Reach Beyond the First Hydration Shell of Ions journal May 2017
2D H-Bond Network as the Topmost Skin to the Air–Water Interface journal June 2017
C-GeM: Coarse-Grained Electron Model for Predicting the Electrostatic Potential in Molecules journal October 2019
Effect of Cosurfactants on the Interfacial Hydration of CTAB Quaternary Reverse Micelle Probed Using Excited State Proton Transfer journal October 2016
Slow Proton Transfer in Nanoconfined Water journal June 2020
Tracking Aqueous Proton Transfer by Two-Dimensional Infrared Spectroscopy and ab Initio Molecular Dynamics Simulations journal May 2019
Coexistence of Multilayered Phases of Confined Water: The Importance of Flexible Confining Surfaces journal January 2018
The Curious Case of the Hydrated Proton journal August 2011
The Conundrum of pH in Water Nanodroplets: Sensing pH in Reverse Micelle Water Pools journal July 2012
Aqueous Basic Solutions: Hydroxide Solvation, Structural Diffusion, and Comparison to the Hydrated Proton journal April 2010
Ab Initio Molecular Dynamics Simulation of the Solvation and Transport of H3O+ and OH- Ions in Water journal April 1995
Confinement or the Nature of the Interface? Dynamics of Nanoscopic Water journal November 2007
Watching the Low-Frequency Motions in Aqueous Salt Solutions: The Terahertz Vibrational Signatures of Hydrated Ions journal December 2011
Interfacial Structures of Acidic and Basic Aqueous Solutions journal October 2008
Ice Nucleation Efficiency of Hydroxylated Organic Surfaces Is Controlled by Their Structural Fluctuations and Mismatch to Ice journal February 2017
Ultrafast Proton Transport between a Hydroxy Acid and a Nitrogen Base along Solvent Bridges Governed by the Hydroxide/Methoxide Transfer Mechanism journal August 2019
Nature of Excess Hydrated Proton at the Water–Air Interface journal December 2019
Effect of Reverse Micelle Size on the Librational Band of Confined Water and Methanol journal September 2001
Ions at the Air/Water Interface journal June 2002
Structure and Dynamics of Concentrated Hydrochloric Acid Solutions journal July 2010
Halide Affinity for the Water−Air Interface in Aqueous Solutions of Mixtures of Sodium Salts journal February 2011
Ultrafast Vibrational Dynamics of Water Confined in Phospholipid Reverse Micelles journal May 2012
Water DynamicsThe Effects of Ions and Nanoconfinement journal May 2008
Molecular Dynamics Simulation of Aerosol-OT Reverse Micelles journal November 2009
Simple Oxovanadates as Multiparameter Probes of Reverse Micelles journal May 2007
What Is Inside a Nonionic Reverse Micelle? Probing the Interior of Igepal Reverse Micelles Using Decavanadate journal April 2009
Variation of marine aerosol acidity with particle size journal January 2002
The nature of the hydrated excess proton in water journal February 1999
Identifying Eigen-like hydrated protons at negatively charged interfaces journal January 2020
Solvent dynamics in a reverse micellar water-pool: a spectroscopic investigation of DDAB–cyclohexane–water systems journal January 2013
A THz/FTIR fingerprint of the solvated proton: evidence for Eigen structure and Zundel dynamics journal January 2015
Local chemistry of the surfactant's head groups determines protein stability in reverse micelles journal January 2018
Interfacial solvation and slow transport of hydrated excess protons in non-ionic reverse micelles journal January 2020
Hydronium ion diffusion in model proton exchange membranes at low hydration: insights from ab initio molecular dynamics journal January 2021
The influence of charge on the structure and dynamics of water encapsulated in reverse micelles journal January 2014
Water dynamics in large and small reverse micelles: From two ensembles to collective behavior journal July 2009
Ab initio molecular dynamics simulation of the solvation and transport of hydronium and hydroxyl ions in water journal July 1995
Structure and dynamics of water in nonionic reverse micelles: A combined time-resolved infrared and small angle x-ray scattering study journal July 2012
Transport and spectroscopy of the hydrated proton: A molecular dynamics study journal September 1999
The computer simulation of proton transport in water journal November 1999
The excess proton at the air-water interface: The role of instantaneous liquid interfaces journal June 2017
2D-HB-Network at the air-water interface: A structural and dynamical characterization by means of ab initio and classical molecular dynamics simulations journal May 2018
Water dynamics at neutral and ionic interfaces journal August 2009
Proton transfer through the water gossamer journal July 2013
Probing the mechanisms of proton transfer in liquid water: Fig. 1. journal August 2013
Correlated interfacial water transport and proton conductivity in perfluorosulfonic acid membranes journal April 2019
Concerted Hydrogen-Bond Dynamics in the Transport Mechanism of the Hydrated Proton: A First-Principles Molecular Dynamics Study journal November 2009
Ultrafast Vibrational and Structural Dynamics of the Proton in Liquid Water journal April 2006
Nonreciprocal interactions induced by water in confinement journal November 2020
Sequential Proton Transfer Through Water Bridges in Acid-Base Reactions journal October 2005
Experiments and Simulations of Ion-Enhanced Interfacial Chemistry on Aqueous NaCl Aerosols journal April 2000
Ultrafast 2D IR spectroscopy of the excess proton in liquid water journal October 2015
Large-amplitude transfer motion of hydrated excess protons mapped by ultrafast 2D IR spectroscopy journal July 2017
Status of experiments probing the dynamics of water in confinement journal September 2003
Analysis of Water in Confined Geometries and at Interfaces journal June 2010
Heterogeneous OH oxidation of palmitic acid in single component and internally mixed aerosol particles: vaporization and the role of particle phase journal January 2008