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相关概念视频

Switching of BJT01:22

Switching of BJT

504
Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are...
504
IR Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

780
Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
780
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

310
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
310
Colors and Magnetism03:02

Colors and Magnetism

12.4K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.4K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

1.7K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
1.7K
IR Absorption Frequency: Delocalization01:04

IR Absorption Frequency: Delocalization

936
Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
In IR...
936

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相关实验视频

Updated: Sep 18, 2025

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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响应刺激的低频特拉赫兹吸收 开启-关闭 旋转交叉材料中的可切换性

Guanping Li1,2, Olaf Stefanczyk1, Kunal Kumar1

  • 1Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.

Advanced materials (Deerfield Beach, Fla.)
|June 25, 2025
PubMed
概括

这项研究引入了一种新的旋转交叉材料,可以在高旋转和低旋转状态之间切换. 这种材料可逆调节太赫兹光吸收,为新型电子设备铺平了道路.

关键词:
从一开始开始计算计算.光磁主义的光磁主义.旋转交叉转换 (spin-crossover) 是一个过程.可切换性可以切换.太赫兹光谱学 太赫兹光谱学

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科学领域:

  • 材料科学 材料科学 材料科学
  • 凝聚物质物理学 凝聚物质物理学
  • 化学 化学 化学

背景情况:

  • 旋转交叉 (SCO) 材料对于传感器和电子设备至关重要.
  • 它们在太赫兹 (THz) 区域的应用尚未得到充分探索.
  • 可切换材料为高级功能提供了潜力.

研究的目的:

  • 为THz应用设计和研究一种新的1D SCO网络.
  • 探索材料的热和光学切换行为.
  • 了解SCO,THz属性和外部刺激之间的关系.

主要方法:

  • 一个独特的1D SCO网络的合成: {[FeII(4-烯) ][HgII(μ-SCN) ]2}n.
  • 温度依赖的晶体学,磁性和THz吸收光谱学.
  • 光诱导激发自旋状态捕获 (LIESST) 效应研究.
  • 第一个原则计算和光晶体分析.

主要成果:

  • 观察到一个突然的SCO现象,在高旋转 (HS) 和低旋转 (LS) 状态之间进行过渡.
  • 冷却速度影响了旋转状态过渡的完整性.
  • 可见光或近红外光诱导了光诱导激发自旋状态捕获 (LIESST) 效应,将LS转换为转移稳定的HS状态.
  • 在特定频率 (例如0.82和1.37 THz) 上,温度和光都可逆调节THz吸收率.

结论:

  • 设计的SCO网络显示了THz吸收的可逆热和光学切换.
  • 这项工作增强了对用于THz应用的SCO材料中的结构属性关系的理解.
  • 这些发现对于开发基于可切换材料的未来THz设备至关重要.