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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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相关实验视频

Updated: Jul 11, 2025

Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films
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一个溶液处理的辐射冷却玻璃

Xinpeng Zhao1, Tangyuan Li1, Hua Xie1

  • 1Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA.

Science (New York, N.Y.)
|November 9, 2023
PubMed
概括
此摘要是机器生成的。

新的辐射冷却材料为建筑物提供了显著的能源节约. 这种创新的"冷却玻璃"涂层即使在潮湿和恶劣的环境中也能有效降低温度.

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Fluid-cell Raman Spectroscopy for operando Studies of Reaction and Transport Phenomena during Silicate Glass Corrosion
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Optimized Sealing Process and Real-Time Monitoring of Glass-to-Metal Seal Structures
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科学领域:

  • 材料科学
  • 纳米技术
  • 可持续能源

背景情况:

  • 通过反射阳光和发射长波红外辐射 (LWIR),被动日间辐射冷却 (PDRC) 材料可以减少建筑物的能源消耗.
  • 开发具有制造实用性,适用性和长期环境稳定的PDRC结构仍然是一个挑战.

研究的目的:

  • 开发一种具有更高性能和耐久性的新型被动冷却材料.
  • 解决现有的 PDRC 技术的局限性.

主要方法:

  • 使用微孔玻璃框架和氧化颗粒制造随机光子复合物.
  • 材料的光学特性 (太阳反射率和LWIR发射率).
  • 在各种环境条件下测试材料的冷却性能,包括高湿度,水暴露,紫外线辐射,污染和高温.

主要成果:

  • 开发的微孔玻璃涂层具有选择性的LWIR发射和高太阳反射率.
  • 在中午达到大约3.5°C的温度下降,在夜间达到4°C,甚至低于80%的湿度.
  • 辐射冷却玻璃涂层在暴露于恶劣条件后显示持续的高太阳反射率.

结论:

  • 这种新型的微孔玻璃复合材料是被动日间辐射冷却的实用和稳定的解决方案.
  • 这项技术为显著降低建筑冷却能源需求提供了有希望的途径.
  • 材料对环境因素的适应性确保了可持续冷却应用的长期有效性.