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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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Molecules with Multiple Chiral Centers02:25

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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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Stability of Substituted Cyclohexanes02:30

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This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
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Conformations of Cyclohexane02:11

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Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
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Transformation of Plane Stress01:18

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Studying stress transformation is essential in understanding how stress components within a material, like a cube under plane stress, change with rotation. This change is analyzed by considering a prismatic element within the cube. As the element rotates, the stress components acting on it—both normal and shearing stresses—change in magnitude and orientation. This change is quantified using trigonometric functions of the rotation angle, relating the forces acting on the rotated element's...
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Chiral topographic instability in shrinking spheres.

Fan Xu1, Yangchao Huang2, Shichen Zhao2

  • 1Institute of Mechanics and Computational Engineering, Department of Aeronautics and Astronautics, Fudan University, Shanghai, P. R. China. fanxu@fudan.edu.cn.

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This summary is machine-generated.

Researchers discovered chiral wrinkling patterns in shrinking core-shell spheres, inspired by nature. This morphoelastic mechanism allows for adaptive grasping, demonstrating a novel biomimetic application.

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Area of Science:

  • Materials Science
  • Biophysics
  • Mechanics of Materials

Background:

  • Biological structures often display complex patterns driven by environmental factors, inspiring new material designs.
  • Deformation in core-shell structures can lead to unique surface topographies with functional implications.

Purpose of the Study:

  • To investigate the chiral wrinkling topography in shrinking core-shell spheres.
  • To understand the morphoelastic mechanisms behind chiral symmetry breaking.
  • To explore the application of these chiral patterns in adaptive grasping.

Main Methods:

  • Experimental observation of silicon core-shells under air extraction.
  • Development of a core-shell model to derive a universal scaling law.
  • Demonstration of adaptive grasping capabilities with various objects.

Main Results:

  • Observed a transition from buckyball patterns to chiral wrinkling in shrinking spheres.
  • Identified secondary symmetry breaking and topological network formation.
  • Developed a model predicting chiral symmetry breaking beyond instability thresholds.
  • Showcased stable grasping of diverse small objects using chiral surface properties.

Conclusions:

  • Revealed novel chiral instability topographies in deformed core-shell spheres.
  • Provided fundamental insights into surface morphogenesis and morphoelasticity.
  • Demonstrated the potential of chiral localization for adaptive grasping applications.