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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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Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
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通过复制品交换加速溶剂动力学,以获得改进的自由能量采样.

Robert Darkins1, Dorothy M Duffy1, Ian J Ford1

  • 1Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, U.K.

Journal of chemical theory and computation
|October 21, 2023
PubMed
概括
此摘要是机器生成的。

将哈密尔顿复制交换 (HREX) 与温和元动力学 (WTMD) 结合起来,可以显著提高分子模拟的准确性. 这种增强的采样方法加速了对表面吸附过程的溶剂动态和自由能量计算的研究.

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Improving High Viscosity Extrusion of Microcrystals for Time-resolved Serial Femtosecond Crystallography at X-ray Lasers
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科学领域:

  • 计算化学是一种计算化学.
  • 材料科学是一种材料科学.
  • 物理化学 物理化学

背景情况:

  • 溶液中的分子反应需要溶剂交换,影响吸附过程.
  • 模拟中的缓慢溶剂动态阻碍了准确的自由能量估计.
  • 当前的方法在模拟过程中难以充分采样溶剂配置.

研究的目的:

  • 为了加快在分子模拟中与集体变量直角的溶剂配置的采样.
  • 为了提高对界面现象的自由能量计算的准确性.
  • 为了研究在石-水界面的碳酸盐空缺的自由能量形成.

主要方法:

  • 哈密尔顿复制交换 (HREX) 与温和元动力学 (WTMD) 的集成.
  • 应用组合HREX-WTMD方法来模拟石-水界面.
  • 碳酸盐空缺的形成自由能量的计算.

主要成果:

  • 结合WTMD和HREX方法显著增强了溶剂配置采样.
  • 改进的抽样导致了对空缺职位形成的更准确的免费能源估计.
  • 与单独使用WTMD相比,该方法显示出更高的性能.

结论:

  • HREX和WTMD的协同组合有效地加速了溶剂动态的模拟.
  • 这种增强的抽样策略可以提高复杂接口中自由能量计算的准确性.
  • 开发的方法为研究分子吸附和界面反应提供了强大的工具.