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Confocal Fluorescence Microscopy01:16

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Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
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激光超快在位置集成的COF晶体.

Ziyu Liu1,2, Xin Wen1,2, Chenqi Yi1,2

  • 1Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China.

The journal of physical chemistry letters
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概括

研究人员开发了一种基于激光的方法,用于快速的共价有机框架 (COF) 结晶,克服缓慢合成的局限性. 这种技术可以在几秒钟内按需在现场制造COF微结构.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 化学工程是化学工程的重要组成部分.
  • 纳米技术纳米技术

背景情况:

  • 联有机框架 (COFs) 的合成受到缓慢的胺基键动力学和高激活能量的阻碍.
  • 传统的溶热溶解方法用于COF结晶是耗时的 (数小时到几天) 并缺乏精确的控制.

研究的目的:

  • 为COF开发一种快速,可控和现场结晶的结晶策略.
  • 为了克服动态共价材料的传统溶热合成的局限性.

主要方法:

  • 利用473nm连续波激光器在固体-液体界面创建一个光热微反应器.
  • 采用高斯聚焦来产生局部热点和的温度梯度,以实现不平衡结晶.
  • 在一个超快的,远离平衡的状态下实现了动态共价交换.

主要成果:

  • 在没有催化剂的情况下,COF-300在几秒钟内在现场核化和生长.
  • 使用激光功率和曝光来实时,确定性地控制核和晶体生长.
  • 启用了有序COF微结构的直接激光写作,具有亚微米空间限制.

结论:

  • 为动态共材料建立了一个可访问的不平衡结晶策略.
  • 介绍了一种可通用的方法,用于快速,可编程的COF结晶.
  • 开放了对光子应用中COF微晶的按需,现场集成的可能性.