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Related Concept Videos

Chirality02:25

Chirality

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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...
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Chirality in Nature02:30

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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.
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The speed of a wave depends on the characteristics of the medium. For example, in the case of a guitar, the strings vibrate to produce the sound. The speed of the waves on the strings and the wavelength determine the frequency of the sound produced. The strings on a guitar have different thicknesses but may be made of similar material. They have different linear densities, and the linear density is defined as the mass per length.
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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...
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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
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When a material is subjected to uniaxial stress, it elongates or contracts in the direction of the applied force, and also undergoes changes in the perpendicular directions. This behavior is crucial for understanding how materials behave under stress and is governed by mechanical properties such as Poisson's ratio v, which measures the ratio of transverse strain to axial strain.
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Rectification of chiral active particles driven by transversal temperature difference.

Bao-Quan Ai1, Jia-Jian Li1, Zhu-Qin Li1

  • 1Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, China.

The Journal of Chemical Physics
|May 17, 2019
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Summary
This summary is machine-generated.

Chiral active particles in a temperature gradient show tunable transport. Their movement direction and speed depend on chirality, boundary conditions, and system parameters like temperature difference and self-propulsion speed.

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Area of Science:

  • Physics
  • Soft Matter Physics
  • Statistical Mechanics

Background:

  • Chiral active particles exhibit unique self-propulsion and rotational dynamics.
  • Temperature gradients can induce directed motion in active matter systems.
  • Channel geometry and boundary conditions significantly influence particle transport.

Purpose of the Study:

  • To investigate the rectification of chiral active particles driven by a transversal temperature difference in a 2D periodic channel.
  • To explore the influence of different wall boundary conditions on particle transport behavior.
  • To analyze the effects of chirality, angular velocity, temperature difference, self-propulsion speed, and packing fraction on particle dynamics.

Main Methods:

  • Theoretical investigation of chiral active particle dynamics.
  • Analysis of particle transport in a two-dimensional periodic channel.
  • Examination of sliding and randomized wall boundary conditions.
  • Systematic variation of key parameters: chirality, angular velocity, temperature difference, self-propulsion speed, and packing fraction.

Main Results:

  • Rectification of chiral active particles is achievable via transversal temperature differences.
  • Transport behavior is highly sensitive to wall boundary conditions.
  • Under sliding boundaries, transport direction depends on particle chirality, with average velocity peaking at specific angular velocities or temperature differences.
  • Under randomized boundaries, complex behaviors emerge, including reversed motion at low self-propulsion speeds and current reversals with parameter tuning at high speeds.

Conclusions:

  • The study demonstrates tunable transport of chiral active particles using temperature gradients and boundary conditions.
  • System parameters offer control over particle motion direction and magnitude, enabling potential applications in micro-manipulation and transport.
  • The findings highlight the rich physics governing active matter in confined geometries with external driving forces.