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相关概念视频

Molecular Geometry and Dipole Moments02:36

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Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...
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用PCP-SAFT建模双极分子:一个矢量组贡献方法.

Carl Hemprich1, Philipp Rehner1, Timm Esper2

  • 1Energy and Process Systems Engineering, Department of Mechanical and Process Engineering, ETH Zurich, Tannenstrasse 3, 8092 Zurich, Switzerland.

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本研究引入了一种新的Vector-GC方法,用于使用扰乱链极 (PCP) -SAFT模型预测热力学特性. 该方法准确地解释了双极物质中的分子对称性,改善了对蒸汽压力和液体密度的预测.

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科学领域:

  • 化学工程是化学工程的重要组成部分.
  • 热力学是一种热力学.
  • 计算化学计算化学

背景情况:

  • 预测热力学性质对于化学过程开发至关重要,因为实验数据稀缺.
  • 统计关联流体理论 (SAFT) 状态方程,如PCP-SAFT,是热力学建模的强大工具.
  • 目前PCP-SAFT的组贡献 (GC) 方法在处理二极体术语方面存在局限性,特别是对于具有多个二极体组的分子,由于对称性效应.

研究的目的:

  • 为扰乱链极 (PCP) -SAFT的双极项开发一个改进的组贡献 (GC) 方法,以解释分子对称性.
  • 提高热力学建模中双极物质GC方法的预测精度和适用性.
  • 为SAFT提供一个开源的,可适应的框架,用于未来开发和应用GC方法.

主要方法:

  • 提出了一种基于向量加法 (Vector-GC) 的方法,用于PCP-SAFT的二极项,利用分子3D结构信息.
  • 预测的分子二极点时刻通过向量添加的债券贡献,解决对称效应.
  • 将 Vector-GC 方法与其他 PCP-SAFT 参数的既定总和规则相结合,为双极物质创造了一种一致的 GC 方法.

主要成果:

  • 与忽视二极子项的方法相比,Vector-GC方法证明了对蒸汽压力和液体密度的更好的预测.
  • 成功实现了 cis 和 trans 异构体之间的分化,突出了其对分子结构的敏感性.
  • 对非关联氧化物和化物质的实验数据进行验证.

结论:

  • 矢量-GC方法显著提高了预测能力,并扩大了PCP-SAFT的组贡献方法的适用性.
  • 矢量GC方法及其回归框架的开源可用性促进了更广泛的采用和进一步的研究.
  • 这种方法克服了当前GC方法的局限性,使复杂的双极分子能够更准确地预测热力学性质.