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相关概念视频

Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Lattice Energies of Ionic Crystals01:27

Lattice Energies of Ionic Crystals

Lattice energy represents the energy released when gaseous cations and anions combine to form an ionic solid, reflecting the strength of electrostatic interactions within the crystal. This process is fundamentally governed by Coulombic attraction between oppositely charged ions, where the potential energy varies inversely with the interionic distance and directly with the product of ionic charges. As ions approach one another, the electrostatic energy becomes increasingly negative, indicating a...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
Adsorption Isotherms II01:25

Adsorption Isotherms II

Brunauer, Emmett, and Teller (BET) introduced a theory in 1938 that modified Langmuir's assumptions to explain multilayer physical adsorption. This theory is applicable to Type II isotherms and provides a more realistic picture of adsorption processes. The BET theory assumes a uniform solid surface with localized adsorption sites, where adsorption at one site doesn't affect adsorption at neighboring sites. This theory also allows for the possibility of additional molecules being adsorbed on top...

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Updated: Jul 7, 2026

Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092
08:53

Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092

Published on: October 2, 2017

在二维基二碳酸盐晶体中的结构和竞争性吸附.

Kibum Kim1, Katherine E Plass, Adam J Matzger

  • 1Department of Chemistry and Macromolecular Science and Engineering Program, University of Michigan, 930 North University, Ann Arbor, MI 48109-1055, USA.

Journal of the American Chemical Society
|March 31, 2005
PubMed
概括

微小的结构变化,如奇偶碳链长度,显著改变了聚合物的特性. 这项研究揭示了这些变化如何影响包装,点和吸附在二碳酸盐中,这对于材料设计至关重要.

科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物化学 聚合物化学
  • 表面科学是一门学科.

背景情况:

  • 功能性材料的合理设计受到影响性质的轻微结构变化所阻碍.
  • 奇偶效应,即链条长度平价极大地改变了像点这样的特性,在结聚合物和寡合物中很突出.

研究的目的:

  • 为了研究基二碳酸盐中奇偶偶效应的结构基础.
  • 了解分子结构和键如何影响吸附行为.

主要方法:

  • 扫描道显微镜 (STM) 用于物理吸附单层.
  • 对于单晶的X射线衍射 (XRD).
  • 计算分析来剖析分子间相互作用.

主要成果:

  • 基二碳酸盐的二维和三维晶体结构在包装几何学上都显示出明显的奇偶效应.
  • 不同的分子间相互作用在奇数和偶数的包装图案与点趋势相关.
  • 由于键密度效应,与基相比,寡合体对来自二元溶液的较小物种具有增强的吸附偏好.

结论:

  • 包装几何学的奇偶效应直接影响基二碳酸盐的点趋势.

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Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices
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Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices

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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

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Last Updated: Jul 7, 2026

Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092
08:53

Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092

Published on: October 2, 2017

Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices
09:31

Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices

Published on: March 27, 2019

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
13:56

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

  • 受表面积竞争影响的键密度,决定了不寻常的竞争性吸附行为.
  • 这些发现为甲表面涂层提供了一个模型,突出了分子结构和键的作用.