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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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The Colloidal State01:29

The Colloidal State

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The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
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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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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
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溶液中的合纳米粒子氧化量的3D演变

Yugang Sun1, Xiaobing Zuo2, Subramanian K R S Sankaranarayanan3

  • 1Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, PA 19122, USA. ygsun@temple.edu zuox@anl.gov ssankaranarayanan@anl.gov.

Science (New York, N.Y.)
|April 22, 2017
PubMed
概括

研究人员使用X射线散射追踪铁纳米颗粒变成空洞纳米的3D转化. 这揭示了纳米级的基肯达尔过程和纳米粒子进化中的缺陷的相互作用.

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科学领域:

  • 材料科学
  • 纳米技术
  • 物理化学

背景情况:

  • 了解纳米粒子转化对于材料科学至关重要.
  • 解决方案中的合纳米颗粒的实时3D跟踪具有挑战性.
  • 氧化过程显著改变了纳米粒子的结构和特性.

研究的目的:

  • 在实时氧化过程中研究体铁纳米粒子的3D演变.
  • 阐明控制固体纳米粒子转化为空洞纳米的机制.
  • 揭示纳米基肯达尔过程和缺陷动态的作用.

主要方法:

  • 同时定时小角度和广角X射线散射 (SAXS/WAXS).
  • 现场观测具有高空间分辨率 (约5安格斯特罗姆).
  • 大规模的反应分子动力学模拟.

主要成果:

  • 在纳米粒子氧化过程中重建中间3D形态.
  • 观察了纳米级的Kirkendall过程,包括空虚凝聚.
  • 根据晶度确定了质量扩散方向的反转.
  • 揭示了缺陷化学和动力学之间的复杂相互作用.

结论:

  • 这项研究为纳米粒子转化机制提供了前所未有的细节.
  • 缺陷化学和动力学是纳米粒子进化的关键决定因素.
  • 这些发现有助于我们更好地理解金属氧化物纳米的形成.