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相关概念视频

Temperature Dependence on Reaction Rate02:55

Temperature Dependence on Reaction Rate

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The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
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Effect of Temperature Change on Reaction Rate02:28

Effect of Temperature Change on Reaction Rate

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The Arrhenius equation,
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Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in...
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Effects of Temperature on Free Energy02:11

Effects of Temperature on Free Energy

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The spontaneity of a process depends upon the temperature of the system. Phase transitions, for example, will proceed spontaneously in one direction or the other depending upon the temperature of the substance in question. Likewise, some chemical reactions can also exhibit temperature-dependent spontaneities. To illustrate this concept, the equation relating free energy change to the enthalpy and entropy changes for the process is considered:
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Le Chatelier's Principle: Changing Temperature02:19

Le Chatelier's Principle: Changing Temperature

29.6K
Consistent with the law of mass action, an equilibrium stressed by a change in concentration will shift to re-establish equilibrium without any change in the value of the equilibrium constant, K. When an equilibrium shifts in response to a temperature change, however, it is re-established with a different relative composition that exhibits a different value for the equilibrium constant.
To understand this phenomenon, consider the elementary reaction:
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Thermodynamic Potentials01:26

Thermodynamic Potentials

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Thermodynamic potentials are state functions that are extremely useful in analyzing a thermodynamic system. They have dimensions of energy. The four important thermodynamic potentials are internal energy, enthalpy, Helmholtz free energy, and Gibbs free energy. These thermodynamic potentials can be expressed using two of the following variables: pressure, volume, temperature, and entropy. These two variables are expressed as the rate of change of the thermodynamic potential with respect to other...
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Author Spotlight: Advancing Cell Membrane Biophysics - Exploring Interactions and Challenges Through Experimental and Computational Approaches
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适应力场参数优化,用于在广泛的温度范围内扩展反应模拟.

Qingfu Huang1, Guixiang Li1, Junjie Wang1

  • 1Key Laboratory of Special Functional Polymeric Materials and Related Technology (Ministry of Education), School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China.

The journal of physical chemistry. A
|March 19, 2024
PubMed
概括

本研究引入了一个适应性框架,以优化ReaxFF参数,模拟高温化学反应. 这种方法提高了在实验温度下聚合物分解模拟的准确性.

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科学领域:

  • 计算化学的计算化学
  • 材料科学 材料科学 材料科学
  • 化学工程是化学工程的重要组成部分.

背景情况:

  • 模拟高温化学反应,如聚合物热分解,仍然具有挑战性.
  • 准确的模拟需要精确的力场参数,特别是反应力场 (ReaxFF).

研究的目的:

  • 开发一个自动优化ReaxFF参数的自适应框架.
  • 在实验温度下提高化学反应模拟的准确性.

主要方法:

  • 利用随机森林和可解释的机器学习来识别有影响力的参数.
  • 训练深度神经网络 (NN) 模型,将参数与参考属性关联起来.
  • 采用基因算法 (GA) 与NN替代模型和量子力学目标进行加速参数搜索.

主要成果:

  • 适应性优化的ReaxFF准确地预测了树脂热解过程中的高峰温度.
  • 在类似实验的条件下实现了合理的产品成分预测.
  • 在实验温度下证明了改进的模拟精度.

结论:

  • 开发的自适应框架显著提高了ReaxFF参数的优化.
  • 这种方法导致更准确和普遍的反应模拟.
  • 促进了计算化学在高温过程中的进步.