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相关概念视频

Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current passing...
Fast Reactions01:27

Fast Reactions

Fast reactions occurring in times shorter than the time needed to mix reactants pose a unique challenge for investigation. In a liquid-phase continuous-flow system, reactants A and B are swiftly pushed into the mixing chamber, where mixing occurs within 1 ms. The reaction mixture then flows through an observation tube, and one measures light absorption to determine species concentrations at various points of the tube. This method is most appropriate when relatively large volumes of reactants...

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相关实验视频

Updated: Jul 17, 2026

Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale
08:17

Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale

Published on: May 25, 2016

表面和接口控制在光化学启动的固定方式上.

Li Liu1, Mark H Engelhard, Mingdi Yan

  • 1Department of Chemistry, Portland State University, P O Box 751, Portland, OR 97207-0751, USA.

Journal of the American Chemical Society
|October 26, 2006
PubMed
概括

通过光活性交叉连接器控制表面亚齐多群密度是聚合物固定化的关键. 调整这种密度会影响薄膜厚度和结构,从光滑的薄膜到单个聚合物分子.

科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物化学 聚合物化学
  • 表面化学 表面化学

背景情况:

  • 表面和接口特性显著影响光化学固定效率.
  • 控制表面上的光活性组的密度对于有针对性的聚合物固定至关重要.

研究的目的:

  • 为了研究表面酸群密度如何影响聚合物固定,使用酸功能化 perfluorophenyl 酸 (PFPA-酸) 照片交叉连接器.
  • 了解表面地形和添加竞争在光化学固定中的作用.

主要方法:

  • 使用PFPA-西兰作为光活性交叉链接剂来固定聚合物.
  • 通过稀释光联结剂并添加非光活性西兰 (PTMS,ODTMS) 来改变表面亚齐多群的密度.
  • 分析了表面地形和增材屏蔽对薄膜厚度和结构的影响.

主要成果:

  • 降低PFPA-西兰度导致亚齐多组密度降低,固定膜厚度降低.
  • 非光活性西兰与PFPA-西兰竞争,加速薄膜厚度的减少.
  • 较长链添加剂 (ODTMS) 更有效地屏蔽了亚齐多基,导致薄膜厚度的减少速度较快,相比较短链添加剂 (PTMS).
  • 减少的亚齐多群密度将固定聚合物结构从光滑的薄膜转变为补丁结构和单个分子.

更多相关视频

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

Published on: February 27, 2019

相关实验视频

Last Updated: Jul 17, 2026

Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale
08:17

Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale

Published on: May 25, 2016

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
07:39

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

Published on: July 21, 2018

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
10:33

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

Published on: February 27, 2019

结论:

  • 表面亚齐多群密度是光化学固定过程中控制聚合物薄膜厚度和形态学的关键参数.
  • 添加剂西兰可以通过竞争表面位置或改变地形来调节固定.
  • 该研究展示了一种调整聚合物不动化的方法,从连续薄膜到离散分子组件.