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相关概念视频

Chirality02:25

Chirality

24.2K
Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
24.2K
Chirality in Nature02:30

Chirality in Nature

13.4K
Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
13.4K
Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

11.7K
Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
11.7K
Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

8.8K
In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
8.8K
Prochirality02:05

Prochirality

3.8K
The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
3.8K
Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

17.0K
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,...
17.0K

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相关实验视频

Updated: Jun 28, 2025

A Micropatterning Assay for Measuring Cell Chirality
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A Micropatterning Assay for Measuring Cell Chirality

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一个基于明显的圆形二元论的二维形微腔.

Tzu-Ling Chen1,2, Andrew Salij3, Katherine A Parrish1

  • 1Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave, Madison, WI, 53706, USA.

Nature communications
|April 9, 2024
PubMed
概括

研究人员使用2D性有机膜在微腔中实现了不对称的光传输,避免了复杂的纳米制造. 这一突破为先进的光学和自旋电子学提供了新的奇拉光物质相互作用.

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相关实验视频

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A Micropatterning Assay for Measuring Cell Chirality
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科学领域:

  • 光学和光子学 在光学和光子学.
  • 材料科学 材料科学 材料科学
  • 奇拉光子学 奇拉光子学

背景情况:

  • 在微腔中不对称的光传输对于合光物相互作用至关重要.
  • 传统方法通常需要复杂的法拉第旋转器或纳米制造.
  • 低模式体积对于增强的轻物质合是可取的.

研究的目的:

  • 展示一种简单的,无纳米制造的方法,用于诱导平面Fabry-Pérot微腔中的不对称传输.
  • 为了利用2D奇拉有机薄膜中的明显圆形二重化 (ACD) 来实现对称性破坏.
  • 为了保持低模式体积,以实现高效的奇拉光物质现象.

主要方法:

  • 在Fabry-Pérot微腔中嵌入有机薄膜,其表面呈现圆形二元化 (ACD).
  • 利用相反的ACD相互作用来对抗光的传播.
  • 通过循环二重化谱学和穆勒矩阵圆测量来表征手术反应.
  • 使用理论散射矩阵方法进行模拟.

主要成果:

  • 实现了空腔模式的显著不对称传输,超过了隔离薄膜的数量超过一个数量级.
  • 展示了一种无纳米制造的方法来打破微腔体中的对称性.
  • 在微腔结构内成功保存低模式体积.

结论:

  • 拟议的方法提供了一种简单而有效的途径,可以在微腔中设计非对称的光传输.
  • 在二维奇拉有机膜中明显的圆形二重化是创建奇拉光学设备的可行机制.
  • 这项工作为螺旋电子学,极子电子学和奇拉激光应用的进步铺平了道路.