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Related Concept Videos

Electrochemical Systems01:24

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current passing...
Processes at Electrodes01:30

Processes at Electrodes

The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...
The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the concentration...
Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

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Taking Advantage of Reduced Droplet-surface Interaction to Optimize Transport of Bioanalytes in Digital Microfluidics
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Microenvironment-Driven Charge Tuning at Microdroplet Interfaces Dictates Criegee Intermediate Reactivity.

Ye-Guang Fang1, Yu Sun1, Yue Liu1

  • 1Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China.

The Journal of Physical Chemistry Letters
|June 4, 2026
PubMed
Summary
This summary is machine-generated.

Water microdroplets significantly alter chemical reactions. The microenvironment, not just electric fields, controls reactivity of Criegee intermediates (CIs), with smaller CIs showing the largest rate enhancements.

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Area of Science:

  • Atmospheric Chemistry
  • Physical Chemistry
  • Chemical Physics

Background:

  • Water microdroplets possess unique physicochemical properties.
  • Interfacial electric fields are traditionally considered the main drivers of microdroplet reactivity.
  • The role of other factors in regulating charge transfer and reaction activity remains unclear.

Purpose of the Study:

  • To investigate how the interfacial microenvironment of water microdroplets influences the chemical reactivity of Criegee intermediates (CIs).
  • To explore factors beyond electric fields that regulate charge transfer and reaction rates in microdroplets.
  • To understand the molecular size selectivity of interfacial catalysis on CIs.

Main Methods:

  • Quantum chemical calculations
  • Enhanced sampling methods
  • Ab initio molecular dynamics simulations
  • Reaction kinetic theory

Main Results:

  • The interfacial microenvironment modulates charge distribution on electrophilic carbon atoms.
  • Interface-to-gas-phase reaction rate ratios for CIs vary by up to 6 orders of magnitude.
  • Small CIs (e.g., CH2OO, CH3CHOO) show 4-6 order-of-magnitude rate enhancements, while larger CIs are less affected.
  • Catalysis is attributed to differential regulation of charge distribution and dynamic fluctuations at the electrophilic center.

Conclusions:

  • The microdroplet interfacial microenvironment plays a crucial role in regulating charge distribution and reactivity of CIs.
  • This effect complements the established electric field perspective on microdroplet chemistry.
  • Findings provide a theoretical basis for atmospheric particle-phase CIs chemistry.