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相关概念视频

Transmission Electron Microscopy01:15

Transmission Electron Microscopy

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In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400...
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对于液相传输电子显微镜流动反应器中的次秒溶液交换动力学.

Stefan Merkens1,2, Christopher Tollan3, Giuseppe De Salvo3,4

  • 1CIC nanoGUNE BRTA, Tolosa Hiribidea 76, 20018, Donostia-San Sebastián, Spain. s.merkens@nanogune.eu.

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概括

一种新的扩散细胞设计增强了液相传导电子显微镜 (LP-TEM),通过使快速的溶液交换和稳定的样本成像. 这一进步加速了液体环境中的纳米级动力学研究.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术
  • 分析化学 分析化学

背景情况:

  • 液相传导电子显微镜 (LP-TEM) 对于观察液体中的纳米级动态至关重要.
  • 现有的微流体流动细胞面临着快速质量传输和样本固定方面的挑战.
  • 控制样品溶液成分对于LP-TEM实验至关重要.

研究的目的:

  • 为LP-TEM引入一种新的液体电池概念,即扩散电池.
  • 为了克服传统流量电池在质量运输和成像方面的局限性.
  • 为了在液态环境中实现更快,更可靠的纳米级观测.

主要方法:

  • 开发一个具有集成芯片绕道的扩散细胞.
  • 使用数值质量运输模型进行原型设计.
  • 基于现有的双芯片微流体设置的制造.
  • 描述水力动力学参数,如流电阻和混合时间常数.

主要成果:

  • 扩散电池显著提高了水力动力学参数2-3个数量级.
  • 在几秒钟内实现了溶液替换动态,与现场混合时间表相匹配.
  • 证明了在纳米通道周围增强的对流运输,用于主要的扩散运输.
  • 原型显示出进一步提高混合效率的潜力.

结论:

  • 扩散细胞概念有效地解决了LP-TEM样本处理方面的挑战.
  • 这种设计有助于整合到现有的LP-TEM工作流程中.
  • 允许在现场和现场实验结果的相关性.
  • 开辟了研究液体中快速纳米级过程的新研究途径.