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相关概念视频

Ionic Compounds: Formulas and Nomenclature03:34

Ionic Compounds: Formulas and Nomenclature

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An element composed of atoms that readily lose electrons (a metal) can react with an element composed of atoms that readily gain electrons (a nonmetal) to produce ions through complete electron transfer. The compound formed by this transfer is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.
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Hydration of Cement01:24

Hydration of Cement

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Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
169
Strength and Heat of Hydration01:29

Strength and Heat of Hydration

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The hydration of cement is an exothermic reaction in which heat is generated as cement hydrates. This heat of hydration is critical to cement's strength development. The rate at which this heat is generated affects the temperature rise, with a majority of the heat being released early in the hydration process, half within the first three days, and about 75% within the first week.
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
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Formation of Halohydrin from Alkenes02:41

Formation of Halohydrin from Alkenes

12.6K
An alkene, such as propene, reacts with bromine in the presence of water to yield a halohydrin. Halohydrins contain a halogen and a hydroxyl group attached to adjacent carbons. When the halogen is bromine, it is called a bromohydrin, while a chlorohydrin has chlorine as the halogen.
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Precipitation of Ions03:11

Precipitation of Ions

27.3K
Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
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Transition Zone01:28

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The transition zone in concrete is a critical area where aggregate meets cement paste, marked by a distinct porosity and weakness compared to the surrounding material. The adhesion around the aggregates is primarily due to Van Der Waals forces. The voids within this zone influence its robustness; initially, it is less durable than the surrounding bulk mortar due to larger voids. Initially, when concrete is compacted, a higher water-cement ratio near the aggregates leads to the formation of...
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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了解CaBr2的水合过渡2

Michaela C Eberbach1,2, Aleksandr I Shkatulov1,3, Paul Tinnemans4

  • 1Eindhoven University of Technology, Den Dolech 2, 5600 MB Eindhoven, The Netherlands.

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这项研究澄清了化 (CaBr2) 对于储热应用的水化路径. 研究人员发现无水化合物和二水化合物之间存在稳定的单水化合物阶段,无论是散装的还是封闭的形式.

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相关实验视频

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科学领域:

  • 材料科学 材料科学 材料科学
  • 化学 化学 化学
  • 储能 储能 储能 储能 储能 储能

背景情况:

  • 盐水合物对于储热电池至关重要,因为它们的能量容量很高.
  • 化 (CaBr2) 具有复杂且有争议的水化通路,阻碍了其应用.
  • 了解CaBr2的水合是开发先进的储能解决方案的关键.

研究的目的:

  • 研究CaBr2在散装和封闭状态中的水化和脱水路径.
  • 识别中间水合物阶段及其过渡条件.
  • 为了澄清CaBr2和CaCl2水合物之间的结构差异.

主要方法:

  • 对散装CaBr2.2的动力相位过渡开始和平衡线的实验测量.
  • 粉末X射线衍光测量用于验证过渡期间的水合物结构.
  • 单晶分析以确定CaBr2水合物的精确晶体结构.
  • 在中孔凝中对CaBr2的表征,以研究受限行为.

主要成果:

  • 一个稳定的单酸相被确定为CaBr2无水和二酸之间的唯一中间体.
  • CaBr2二水合物与CaCl2二水合物具有结构上的相似性,在单元细胞大小上有所不同.
  • 与CaCl2单水合物相比,CaBr2单水合物表现出一个独特的晶体结构.
  • CaBr2 在密封的中孔性二氧化凝中表现出一致的水化步骤,如在散装形式观察到的.

结论:

  • 这项研究解决了CaBr2中介水合物阶段的模糊性,证实了单水合物.
  • 在散装和封闭形式中,CaBr2可预测的水化行为支持其用于储热应用的潜力.
  • 对CaBr2水合物的结构洞察力为热能储存中的材料设计提供了基础.