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相关概念视频

Entropy and Solvation02:05

Entropy and Solvation

8.6K
The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
8.6K
Intermolecular Forces03:13

Intermolecular Forces

73.6K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
73.6K
IR Spectrum Peak Broadening: Hydrogen Bonding01:23

IR Spectrum Peak Broadening: Hydrogen Bonding

1.9K
The vibrational frequency of a bond is directly proportional to its bond strength. As a result, stronger bonds vibrate at higher frequencies, while weaker bonds vibrate at lower frequencies. The stretching vibration of the strong O–H bond in alcohols and phenols (very dilute solution or gas phase) appears as a sharp peak at 3600–3650 cm−1.
However, the extent of hydrogen bonding influences the observed stretching frequency and band broadening. Intermolecular or intramolecular...
1.9K
Membrane Fluidity01:26

Membrane Fluidity

17.1K
Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is...
17.1K
Membrane Fluidity01:23

Membrane Fluidity

176.9K
Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
176.9K
Molecular Shape and Polarity03:37

Molecular Shape and Polarity

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Dipole Moment of a Molecule
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相关实验视频

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Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy
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光谱相似性掩盖了疏水水界面的结构多样性.

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  • 1Princeton University, Department of Chemistry, Princeton, New Jersey 08544, USA.

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概括

深度学习揭示了石墨烯-水和空气-水接口的显微特征,尽管相似的总频生成 (SFG) 频谱. 差异在于厚度,结合和动态,突出了独特的固体-液体接口特性.

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Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy
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Author Spotlight: Unveiling the Potential of VSFG Microscopy in Studying Mesoscopically Heterogeneous Self-Assembled Structures
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科学领域:

  • 表面科学是一门科学.
  • 计算化学是一种计算化学.
  • 材料科学是一种材料科学.

背景情况:

  • 空气-水和石墨烯-水接口是液体-气体和液体-固体界限的关键模型.
  • 总频生成 (SFG) 光谱显示了这些接口之间的相似之处,但解释不同.
  • 在SFG光谱中的实验差异需要先进的计算方法.

研究的目的:

  • 以计算方式研究和区分空气-水和石墨烯-水接口的微观特性.
  • 解决对这些系统的实验SFG光谱的解释中的差异.
  • 为了利用深度学习来实现SFG频谱计算的第一原则.

主要方法:

  • 利用深度学习来计算第一原则的总频生成 (SFG) 频谱.
  • 分析并比较了空气-水和石墨烯-水接口的SFG光谱.
  • 研究了界面厚度,键和表面动态.

主要成果:

  • 尽管SFG的光谱相似,但空气-水和石墨烯-水接口的显微特性从根本上有所不同.
  • 在SFG活性层厚度,结网络结构和表面动态方面发现了关键差异.
  • 石墨烯-水接口显示粗性抑制和电子相互作用缺席的空气-水接口.

结论:

  • 在SFG信号中的相似性并不意味着类似的接口结构或动态.
  • 固体-液体 (石墨烯-水) 接口与液体-气体 (空气-水) 接口相比,具有独特的特性.
  • 基于深度学习的第一原则计算对于准确解释接口现象至关重要.