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相关概念视频

Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

2.3K
Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
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Metallic Solids02:37

Metallic Solids

18.6K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Precipitation Processes01:12

Precipitation Processes

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The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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Colloidal precipitates01:09

Colloidal precipitates

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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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Structural Isomerism02:34

Structural Isomerism

19.6K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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基于柱体的可变固态度共结晶:多样化固态超结构的多功能方法

Ming Li1, Yang Liu1, Li Shao2

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概括
此摘要是机器生成的。

研究人员使用柱状和四烯 (TCNB) 制造了新的可变静态度共晶体. 这些超分子结构具有可调节的特性,并使n-bromoalkanes的蒸发色检测成为可能.

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科学领域:

  • 固态超分子化学
  • 石柱烯的化学成分
  • 主机-客户复合

背景情况:

  • 可变石化学共晶对于结构-属性关系研究和合成新支架至关重要.
  • 柱体化学提供了一个超分子组装的多功能平台.
  • 氨 (TCNB) 是宿主-客人化学中的常见客分子.

研究的目的:

  • 扩展可变静态度共晶的概念到柱体烯化学.
  • 在固态中使用柱体和TCNB构建多种超分子结构.
  • 探索这些新型共晶体的物理化学特性和传感应用.

主要方法:

  • 使用柱体[n] (n=5,6) 和四烯 (TCNB) 合成可变静态度共晶体.
  • 共同晶体结构和自组装超结构的特征.
  • 研究固态物理化学特性,包括颜色和发光.
  • 对n-bromoalkanes的蒸气色传感能力的评估.

主要成果:

  • 成功构建了柱状和TCNB的多种可变静态度共晶体.
  • 观察到由内腔和外部结合相互作用驱动的独特的自组装超结构.
  • 显示可调整的固态特性,如颜色和发光.
  • 发现了独特的混合共晶体系统, 包含两组宿主-客座复合体.
  • 使用这些基于pilarene的共同晶体实现了n-bromoalkanes的蒸发色检测.

结论:

  • 可变静态度联合晶体为构建多种超分子结构提供了合理的策略.
  • 皮拉拉烯-TCNB共晶体具有可调节的发光和颜色特性.
  • 发现的混合共晶系统对n-bromoalkanes的蒸发色感应有效.
  • 这项工作为设计具有定制性质的功能固态材料开辟了新的途径.