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Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

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It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
17.2K
Angle of Twist - Elastic Range01:13

Angle of Twist - Elastic Range

358
Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
358
Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

349
An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the...
349

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相关实验视频

Updated: Jul 20, 2025

Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
07:24

Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals

Published on: April 14, 2020

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在扭曲的无向型二维材料中调节光学活动.

Su-Yun Wang1, De-Kang Li1, Ming-Jie Zha1

  • 1The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, School of Physics and Teda Applied Physics Institute, Nankai University, Tianjin 300071, China.

ACS nano
|August 2, 2023
PubMed
概括

研究人员在像黑 (BP) 和ReS2.2这样的扭曲的二维异性质材料中设计了可调整的奇拉性. 这一突破为先进的纳米设备和手术应用提供了巨大的潜力.

关键词:
2D 材料是二维材料.迷你化的迷你化可调节的圆形二元化.扭曲的 ReS2 的情况.扭曲的黑色的.

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Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light
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Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light

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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

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相关实验视频

Last Updated: Jul 20, 2025

Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
07:24

Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals

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Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light
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Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light

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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

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科学领域:

  • 凝聚物质物理学 凝聚物质物理学
  • 材料科学 材料科学 材料科学
  • 纳米技术 纳米技术

背景情况:

  • 扭曲的范德瓦尔斯结构为纳米设备提供了独特的电气和光学特性.
  • 由于制造和测量限制,在电影中编程原子尺度的奇拉性具有挑战性.

研究的目的:

  • 为了在扭曲的异型二维材料中展示高度调节的大光学活动.
  • 通过材料对称性,带结构和异构性来探索量身定制的性.

主要方法:

  • 使用黑 (BP),ReS2,PdSe2和α-MoO3.3制造扭曲的范德瓦尔斯异构结构.
  • 在堆叠的二维材料层之间,扭转角度的系统变化.
  • 在可见光到红外光谱中对手术视觉反应的描述.

主要成果:

  • 通过控制2D异性质材料的扭曲角度,实现了高度调节的性.
  • 报告了记录厚度正常化的圆性 (13.8度μm−1,扭曲ReS2) 和圆性 (1581mdeg,扭曲BP).
  • 使用扭曲的ReS2.2,证明了对信息转换的自旋选择性控制.

结论:

  • 在扭曲的2D异性质材料中,工程化奇拉性是高度可控的.
  • 这些材料表现出从可见到红外波长的广泛的手术反应.
  • 潜在的应用包括芯片上的极化光学,纳米光电子和生物传感.