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Intermolecular Forces in Solutions02:28

Intermolecular Forces in Solutions

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The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
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Atomic Force Microscopy01:08

Atomic Force Microscopy

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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
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Atomic Structure01:33

Atomic Structure

208.6K
Overview
208.6K
Atomic Structure01:17

Atomic Structure

17.0K
The Greek philosopher Democritus proposed that everything on Earth is made up of tiny particles called atomos, Greek for "indivisible," from which the modern term "atom" is derived. In the 19th century, John Dalton proposed the atomic theory that is still largely correct today. He put forth five postulates to explain how atoms made up the world around us. (1) All matter is composed of infinitely small particles or atoms. (2) All atoms of a given element are identical to one...
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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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...
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Temperature Dependence on Reaction Rate02:55

Temperature Dependence on Reaction Rate

88.9K
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...
88.9K

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相关实验视频

Updated: Jan 28, 2026

Bacterial Immobilization for Imaging by Atomic Force Microscopy
10:03

Bacterial Immobilization for Imaging by Atomic Force Microscopy

Published on: August 10, 2011

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通过原子力显微镜在溶液中生长的结晶过程中的温度依赖链结构.

Dingrui Wang1, Xiaobin Liang1, Ken Nakajima1

  • 1Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Institute of Science Tokyo, Ookayama 2-12-1, Meguro-ku, Tokyo,  152-8552, Japan.

Macromolecular rapid communications
|January 26, 2026
PubMed
概括

通过单分子力光谱学研究聚乙烯氧化物 (PEO) 结晶,发现了温度依赖的结构变化. 高温有利于相邻的重新进入结构,而低温有利于聚合物链折叠中的中间结构.

关键词:
链条结构 链条结构 链条结构结晶机制的结晶机制是什么单个聚合物链的单一聚合物链.单分子力光谱法 单分子力光谱法

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Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers
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Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers

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Probing The Structure And Dynamics Of Nucleosomes Using Atomic Force Microscopy Imaging
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Probing The Structure And Dynamics Of Nucleosomes Using Atomic Force Microscopy Imaging

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相关实验视频

Last Updated: Jan 28, 2026

Bacterial Immobilization for Imaging by Atomic Force Microscopy
10:03

Bacterial Immobilization for Imaging by Atomic Force Microscopy

Published on: August 10, 2011

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Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers
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Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers

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Probing The Structure And Dynamics Of Nucleosomes Using Atomic Force Microscopy Imaging
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Probing The Structure And Dynamics Of Nucleosomes Using Atomic Force Microscopy Imaging

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科学领域:

  • 聚合物科学 聚合物科学
  • 材料科学 材料科学 材料科学
  • 物理化学 物理化学

背景情况:

  • 像聚乙烯氧化物 (PEO) 这样的半晶体聚合物具有成本效益和广泛使用.
  • 聚合物结晶行为对结晶温度 (Tc) 非常敏感.
  • 了解单链折叠对于控制聚合物特性至关重要.

研究的目的:

  • 研究结晶温度对PEO中单链折叠结构的影响.
  • 阐明温度,链条折叠和聚合结构之间的关系.
  • 引入一种基于AFM的单分子力光谱 (SMFS) 方法来研究聚合物结晶.

主要方法:

  • 采用了基于原子力显微镜 (AFM) 的单分子力光谱 (SMFS).
  • 力量-体积 (FV) 模式可以同时测量单链力和表面形态.
  • 对强力延伸曲线和SMFS前/后形态变化的分析提供了分子层面的见解.

主要成果:

  • 结晶温度会影响PEO中形成的链式折叠结构的类型.
  • 低温有利于中间结构,而高温有利于相邻的重新进入结构.
  • 温度不会改变链条折叠的程度 (相邻的回入折叠的数量),但由于表面自由能量变化,会影响聚合结构.

结论:

  • 基于AFM的SMFS提供了一种新的方法来研究聚合物结晶过程中的单链结构动态.
  • 这些发现提供了关于结晶温度如何决定半晶聚合物的分子层次组织的见解.
  • 了解这些结构是定制聚合物材料特性的关键.