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Crystal Growth: Principles of Crystallization01:25

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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...
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Recrystallization: Solid–Solution Equilibria01:10

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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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使用多电解质溶液和剪切流促进晶体生长

Jian-Ke Sun1,2, Yaroslav I Sobolev1, Weiyi Zhang3

  • 1Center for Soft and Living Matter, Institute for Basic Science, Ulsan, South Korea.

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概括

用聚合物使晶体生长加速,比静态方法更快地产生更大的晶体. 这种新的剪切驱动技术提高了晶体大小和工业应用的形成速度.

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科学领域:

  • 材料科学
  • 化学工程
  • 晶体学

背景情况:

  • 晶体生长对于单晶衍射,工业过程和药物批准至关重要.
  • 传统方法避免机械干扰,如,这可能导致二次核和减少晶体大小.
  • 剪流通常被认为对晶体生长有害,导致更小的晶体.

研究的目的:

  • 调查聚合物存在的对晶体生长的影响.
  • 确定剪切是否可以增强晶体大小和生长速度.
  • 探索一种加速晶体生长的新方法.

主要方法:

  • 在常见溶剂中研究了约20种不同的化合物 (有机,无机,金属有机,蛋白质) 的晶体生长.
  • 使用聚合物和在恒温下静态条件下的晶体生长比较.
  • 分析了晶体大小,形态和生长速度.

主要成果:

  • 与静态对照相比,用聚合物显著增加了晶体大小 (最大16倍) 和生长速度.
  • 在几分钟到几十分钟内得到正规的晶体.
  • 确定了两个协同效应:聚合物解/溶解竞争和切割速率对粒子大小的依赖.

结论:

  • 聚合物存在的剪切驱动结晶加速生长并增强晶体大小.
  • 这种方法为传统的晶体生长技术提供了有价值的替代方案.
  • 在材料和制药行业加速晶体生产的潜在应用.