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Related Concept Videos

Transition State Theory01:25

Transition State Theory

Transition-state theory, also known as activated-complex theory, provides a molecular-level explanation of reaction rates in both gas-phase and solution-phase reactions. It extends earlier kinetic models by considering the formation of a short-lived, high-energy configuration during a reaction.The progress of a chemical reaction can be represented using a reaction profile, which plots potential energy against the reaction coordinate. As two reactant molecules approach one another, their...
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
Predicting Reaction Outcomes02:24

Predicting Reaction Outcomes

Kinetics describes the rate and path by which a reaction occurs. In contrast, thermodynamics deals with state functions and describes the properties, behavior, and components of a system. It is not concerned with the path taken by the process and cannot address the rate at which a reaction occurs. Although it does provide information about what can happen during a reaction process, it does not describe the detailed steps of what appears on an atomic or a molecular level. On the other hand,...
Reaction Mechanisms: Rate-limiting Step Approximation01:29

Reaction Mechanisms: Rate-limiting Step Approximation

The rate-determining step, or RDS, in a chemical reaction is the slowest step that determines the overall reaction rate. It is identified by using the observed rate law and typically involves approximation methods like the RDS approximation or the steady-state approximation.In the RDS approximation, also known as the rate-limiting-step or equilibrium approximation, the reaction mechanism consists of one or more reversible reactions near equilibrium, followed by a slower RDS, and then one or...
Formation of Complex Ions03:45

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
Complexation Equilibria: Overview01:23

Complexation Equilibria: Overview

Complexation reactions take place when dative or coordinate covalent bonds form between metal ions and ligands. The compounds formed in these reactions are called coordination compounds. The number of bonds formed between the metal ion and the ligands is called its coordination number. Generally, most metal ions in an aqueous solution are solvated by water molecules and thus exist as aqua complexes.
The equilibrium constant of the complexation reaction is represented as the formation constant...

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Related Experiment Video

Updated: May 9, 2026

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
10:52

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Published on: April 12, 2019

Efficient atomic-scale kinetics through a complex heterophase interface.

Laure Bourgeois1, Nikhil V Medhekar, Andrew E Smith

  • 1Monash Centre for Electron Microscopy, Monash University, Victoria 3800, Australia. laure.bourgeois@monash.edu

Physical Review Letters
|August 13, 2013
PubMed
Summary
This summary is machine-generated.

Atomic-scale imaging reveals a diffuse interface between Al-Cu phases, challenging previous studies. Efficient kinetics, not energy, drives the Al-Cu solid solution to θ

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Area of Science:

  • Materials Science
  • Metallurgy
  • Solid-State Physics

Background:

  • Understanding phase transformations in aluminum-copper alloys is crucial for materials engineering.
  • The interface between the Al-Cu solid solution (αCu) and θ' (Al2Cu) phases is key to alloy properties.

Purpose of the Study:

  • To investigate the atomic-scale structure and energetics of the αCu/θ' heterophase interface.
  • To resolve discrepancies with previous studies on the nature of this interface.

Main Methods:

  • Utilizing atomic-scale imaging techniques.
  • Employing first-principles modeling for theoretical analysis.

Main Results:

  • Observed a diffuse, well-defined interface approximately 1 nm thick, facilitating αCu to θ' phase progression.
  • Demonstrated that this interface structure is not energetically favored.
  • Identified efficient atomic-scale kinetics as the driving force for the phase transformation.

Conclusions:

  • The αCu/θ' interface structure is kinetically controlled, not thermodynamically preferred.
  • This finding offers new insights into phase transformation mechanisms in Al-Cu alloys.
  • Highlights the interplay between interfacial structure, energy, and kinetics in materials.