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関連する概念動画

Combustion Energy: A Measure of Stability in Alkanes and Cycloalkanes02:14

Combustion Energy: A Measure of Stability in Alkanes and Cycloalkanes

6.2K
The low reactivity in alkanes can be attributed to the non-polar nature of C–C and C–H σ bonds. Alkanes, therefore, were  initially termed as “paraffins,” derived from the Latin words: parum, meaning “too little,” and affinis, meaning “affinity.”
Alkanes undergo combustion in the presence of excess oxygen and high-temperature conditions to give carbon dioxide and water. A combustion reaction is the energy source in natural gas, liquified...
6.2K
Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.2K
Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
2.2K
Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

1.8K
Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
1.8K
Catalysis02:50

Catalysis

22.9K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
22.9K
Electrophilic Addition of HX to 1,3-Butadiene: Thermodynamic vs Kinetic Control01:23

Electrophilic Addition of HX to 1,3-Butadiene: Thermodynamic vs Kinetic Control

3.4K
The addition of a hydrogen halide to 1,3-butadiene gives a mixture of 1,2- and 1,4-adducts. Since more substituted alkenes are more stable, the 1,4-adduct is expected to be the major product. However, the product distribution is strongly influenced by temperature; low temperature favors the 1,2-adduct, whereas the 1,4-adduct is predominant at high temperature.
3.4K
Reaction Mechanisms: Rate-limiting Step Approximation01:29

Reaction Mechanisms: Rate-limiting Step Approximation

92
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...
92

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Updated: Apr 28, 2026

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

Published on: April 12, 2019

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適応加速ReaxFFの反応力学は,水素燃焼シミュレーションから検証された.

Tao Cheng1, Andrés Jaramillo-Botero, William A Goddard

  • 1School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University , Shanghai 200240, China.

Journal of the American Chemical Society
|June 3, 2014
PubMed
まとめ

私たちは,水素燃焼のシミュレーションを高速化するために,適応型加速反応FF反応力学 (aARRDyn) を開発しました. この方法は,計算コストを大幅に削減しながら,幅広い温度範囲における反応動力学とメカニズムを正確に予測します.

科学分野:

  • コンピューティング・ケミストリー
  • 化学動力学 化学動力学
  • 分子ダイナミクス 分子ダイナミクス

背景:

  • 反応分子動力学 (RMD) のシミュレーションは,燃焼を理解するために不可欠ですが,計算的には高価です.
  • 既存のReaxFFの力場は,特定の反応システムや中間物質に対して再最適化が必要になる可能性があります.

研究 の 目的:

  • ボンド・ブースト・コンセプトを使用して,ReaxFFベースのRMDシミュレーションを加速するための方法論を開発し,検証する.
  • 広範囲の温度スペクトルで加速法を使用して,水素燃焼の動力学とメカニズムを調査する.

主な方法:

  • ReaxFF-RMDにボンドブースト (BB) コンセプトを統合することで,適応性加速RaxFF反応力学 (aARRDyn) を開発しました.
  • 2498 Kの水素燃焼で,動力学と反応メカニズムを評価して,ブルートフォースRMD (BF-RMD) に対してaARRDynを検証しました.
  • ReaxFFの力場 (ReaxFF-OH2014に) を再最適化して,H3O.のような反応中間物質の精度が向上しました.

主要な成果:

  • aARRDynは,BF-RMDと比較して,高温での水素燃焼運動とメカニズムを正確に再現しました.
  • 798 K2998 Kに拡張されたシミュレーションでは,aARRDynとエキストラポレーションされたBF-RMD反応速度との間の良好な一致が示されました.

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Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer
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  • 798KでのaARRDynシミュレーションで約0.42兆 (10^12) の速度増加を達成し,計算コストを大幅に削減しました.

    • 結論:

    • aARRDynの方法論は,水素燃焼のような反応性システムのReaxFF-RMDシミュレーションに著しく加速します.
    • 検証されたaARRDyn方法は,関連する温度範囲における燃焼現象の正確かつ効率的な探査を可能にします.
    • ReaxFF-OH2014力場の開発により,特定の化学的中間物質のシミュレーションの精度が向上しています.