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Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
Colloidal precipitates01:09

Colloidal precipitates

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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相关实验视频

Updated: Jul 12, 2026

In Situ SIMS and IR Spectroscopy of Well-defined Surfaces Prepared by Soft Landing of Mass-selected Ions
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Published on: June 16, 2014

控制的沉积,软着陆和玻璃形成在纳米集群-表面碰撞中.

H P Cheng, U Landman

    Science (New York, N.Y.)
    |May 28, 1993
    PubMed
    概括
    此摘要是机器生成的。

    分子动力学模拟表明,对液体膜的纳米晶体的影响可以实现受控软着陆. 这一过程与固体表面冲击不同,为纳米相物质生长提供了一种新方法.

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    科学领域:

    • 材料科学 材料科学 材料科学
    • 计算化学计算化学
    • 纳米技术 纳米技术

    背景情况:

    • 纳米晶体对表面的影响可能导致不受控制的碎片化和化.
    • 了解碰撞期间的能量转移对于材料合成至关重要.

    研究的目的:

    • 为了研究纳米晶体对液体薄膜的影响的动态.
    • 探索能量再分配及其对纳米晶体行为的影响.
    • 确定控制纳米晶体着陆和材料生长的方法.

    主要方法:

    • 使用分子动力学模拟.
    • 模拟化 (NaCl) 纳米晶体对液态和膜的影响.
    • 分析能量转移,速度变化和相位过渡.

    主要成果:

    • 对固体表面的冲击造成了融化,破坏,碎片化和反弹.
    • 与虹膜的碰撞导致了高效的能量传输和软着陆.
    • 对膜的冲击导致了快速减弱,加热,化,随后通过蒸发冷却到玻璃状.

    结论:

    • 液体薄膜有助于控制的纳米晶体软着陆.
    • 撞击动态高度依赖于液体膜的特性.
    • 这种方法为纳米相材料的受控合成提供了一个新的策略.