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相关概念视频

Colloids03:22

Colloids

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Molecular Comparison of Gases, Liquids, and Solids02:26

Molecular Comparison of Gases, Liquids, and Solids

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Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
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Colloids and Suspensions01:17

Colloids and Suspensions

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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Hybridization of Atomic Orbitals I03:24

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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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Colloidal precipitates01:09

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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sp3d and sp3d 2 Hybridization
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Synthesis and Exfoliation of Discotic Zirconium Phosphates to Obtain Colloidal Liquid Crystals
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混合分子合液晶

Haridas Mundoor1, Sungoh Park1, Bohdan Senyuk1

  • 1Department of Physics and Soft Materials Research Center, University of Colorado, Boulder, CO 80309, USA.

Science (New York, N.Y.)
|May 19, 2018
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概括

研究人员通过将无机体棒与分子液晶相结合,制造出一种新型的体液体. 这种混合材料具有独特的特性, 可以通过外部场进行控制.

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科学领域:

  • 软物质物理学
  • 材料科学
  • 体科学

背景情况:

  • 在生物膜和液晶等系统中存在秩序和流动性.
  • 软物质系统的对称性往往高于它们的构成部分.
  • 阴性液晶的特点是棒状分子的定向顺序.

研究的目的:

  • 研究由体和分子棒组成的混合流体的自组合和相位行为.
  • 探索异型粒子混合物中新型有序相的形成.
  • 了解流体系统中不同类型的棒状构件之间的相互作用.

主要方法:

  • 在阴性液晶液体中分散微米长的无机体棒.
  • 阶段形成和结构特征的实验观察.
  • 开发一个粗粒度模型来解释观察到的相位图和方向分布.

主要成果:

  • 从相互作用的单轴体和分子棒中形成一个正体阴性流体.
  • 在实验温度-度相图中确定一个双轴和两个单轴的阴性相.
  • 证明混合流体具有双轴光学晶体的特性,并且可以通过电场和磁场进行切换.

结论:

  • 混合分子合体流体可以表现出独特的有序相,其对称性与其组成部分不同.
  • 开发的粗粒度模型准确地预测了相位行为和方向排序.
  • 这些可调节的混合材料具有在光学和响应材料中的应用潜力.