由高功率火喷射的沉积物的微观结构,具有高度悬浮物的闪沸原子化
Saeid Amrollahy Biouki1, Fadhel Ben Ettouil1, Andre C Liberati1
1Department of Mechanical, Industrial and Aerospace Engineering, Concordia University, Montreal, QC H3G 1M8, Canada.
Materials (Basel, Switzerland)
|April 13, 2024
概括
闪沸原子化有效地将高度氧化悬浮物注入等离子体流中. 沉积效率和微观结构在很大程度上取决于等离子体功率和固体度,在高功率下实现密集沉积.
科学领域:
- 材料科学 材料科学 材料科学
- 等离子体物理学的物理学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 将高固体含量悬浮剂注入等离子体流中是一项挑战.
- 氧化 (TiO2) 是各种应用的关键材料.
- 优化沉积过程对于物质属性控制至关重要.
研究的目的:
- 为了评估用于注射高固体含量TiO2悬浮剂的快速沸原子化.
- 为了研究等离子体功率和固体度对沉积的影响.
- 分析沉积物的微观结构和相分布 (rutile/anatase) 的结果.
主要方法:
- 制备基于水的TiO2悬浮液,其固体度为20-70%的重量%.
- 将悬浮物注入由33-110千瓦的等离子火产生的等离子流中.
- 使用X射线衍射 (XRD) 分析沉积的微结构和相位组成.
主要成果:
- 在低等离子功率下,沉积效率随着固体含量增加而下降,导致未化颗粒的重量为70%.
- 在高等离子功率下,沉积效率随着固体度的增加而增加,产生70%重量的密集沉积物.
- 解剖酶阶段百分比从35.7%到66.9%不等,受功率和度的影响.
结论:
- 闪沸原子化是一种高固体含量悬浮注射的可行方法.
- 等离子体功率和固体度是控制沉积效率和微观结构的关键参数.
- 通过调整过程参数,可以实现控制TiO2的相位分布 (解剖酶/基).
相关概念视频
Atomic Absorption Spectroscopy: Atomization Methods
418
Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
418
Washing, Drying, and Ignition of Precipitates
911
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...
911
Preparation of Samples for Electron Microscopy
5.4K
To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
5.4K
Sample Preparation for Analysis: Advanced Techniques
331
Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
331
Colloidal precipitates
574
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...
574


