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相关概念视频

Precipitation Processes01:12

Precipitation Processes

483
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...
615
Washing, Drying, and Ignition of Precipitates00:52

Washing, Drying, and Ignition of Precipitates

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After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
946
Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

1.1K
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...
1.1K
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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Solution Equilibrium and Saturation01:59

Solution Equilibrium and Saturation

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Imagine adding a small amount of sugar to a glass of water, stirring until all the sugar has dissolved, and then adding a bit more. You can repeat this process until the sugar concentration of the solution reaches its natural limit, a limit determined primarily by the relative strengths of the solute-solute, solute-solvent, and solvent-solvent attractive forces. You can be certain that you have reached this limit because, no matter how long you stir the solution, undissolved sugar remains. The...
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在Eutectic滴中进行预固化.

Bene Poelsema1, Zhiguo Zhang1, Harold J W Zandvliet1

  • 1Physics of Interfaces and Nanomaterials, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, Netherlands.

Physical review letters
|September 22, 2023
PubMed
概括
此摘要是机器生成的。

预固化,与预化相反,影响了- (Ge-Pt) 滴滴的运动. 滴滴运动方向意外地变化,与基板保持一致.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 表面科学是一门学科.
  • 物理 物理学 物理

背景情况:

  • 预化描述了固体在低于化温度的表面破坏.
  • 预固化是发生在液体-固体界面的类似现象,影响材料的行为.
  • 了解接口现象对于控制材料属性和过程至关重要.

研究的目的:

  • 为了研究 (Ge) 基板上的-白金 (Ge-Pt) 滴滴中预固化的现象.
  • 为了确定预凝固对这些水滴的热梯度驱动运动的影响.
  • 探索滴滴形态与运动方向之间的关系.

主要方法:

  • 使用具有 (110) 表面方向的 (Ge) 基板.
  • 在受控的热梯度下观察微米大小的Eutectic Ge-Pt滴的行为.
  • 分析滴滴运动方向和形状的变化,在接近和高于水温度 (T_C) 的温度下.

主要成果:

  • 在远高于T_C的温度下,不管基板的方向如何,滴滴都向热源移动.
  • 在高于T_C的90K发生了明显的转变,滴滴表现出强烈的偏好沿着[001]光方向运动.
  • 这种定向运动伴随着滴水形状的变化,从紧到沿着[001]方向延长.
  • 观察到的行为归因于液体-固体界面的预固化效应.

结论:

  • 预固化显著影响了Eutectic Ge-Pt滴在Ge(110) 基板上的方向运动.
  • 这种现象决定了滴滴运动从热友运动到异能运动的过渡.
  • 这一发现为界面现象及其在物质运输中的作用提供了新的见解.