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相关概念视频

Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

2.0K
Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
2.0K
Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

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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...
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激光诱导化用于控制溶液中的结晶.

Nagaraj Nagalingam1, Aswin Raghunathan1, Vikram Korede1

  • 1Process and Energy Department, Delft University of Technology, Leeghwaterstraat 39, 2628 CB Delft, Netherlands.

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此摘要是机器生成的。

激光诱导的化气泡会触发超和溶液中的结晶. 该过程依赖于激光能量,散热控制蒸发,并产生超和峰值,影响晶体形成.

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科学领域:

  • 物理化学 物理化学
  • 材料科学 材料科学 材料科学
  • 激光物理 激光物理

背景情况:

  • 超和溶液的结晶在各种科学和工业应用中至关重要.
  • 控制核化动力学对于定制晶体特性至关重要.
  • 激光物质相互作用为操纵物理过程提供了新的方法.

研究的目的:

  • 研究激光诱导的化气泡形成的机制及其对结晶的影响.
  • 阐明激光能量,泡动力学和核化动力学之间的关系.
  • 了解溶剂蒸发和超和在蒸汽-液体界面的作用.

主要方法:

  • 使用低于分解值的Nd:YAG激光脉冲启动化气泡.
  • 高速视频显微镜观察气泡动力学和晶体核形成.
  • 计算模拟以模拟蒸发和超和在蒸汽-液体界面上的溶剂.

主要成果:

  • 化气泡从过的水溶液中诱导结晶.
  • 核化动力学取决于超和度和激光脉冲能量.
  • 模拟显示,散热 (潜伏热与感应热) 控制了蒸发速度,并产生了短暂的超和峰值.
  • 晶体数量和形态与模拟超和峰值的特征相关.

结论:

  • 激光诱导的化提供了一种可控制的方法来启动结晶.
  • 激光能量吸收,散热和溶剂蒸发之间的相互作用决定了结晶过程.
  • 这项研究提供了通过定制的激光-液体相互作用来控制晶体核和生长的见解.