Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Chirality in Nature

Chirality in Nature

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.

Molecules with Multiple Chiral Centers

Molecules with Multiple Chiral Centers

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...

Chirality at Nitrogen, Phosphorus, and Sulfur

Chirality at Nitrogen, Phosphorus, and Sulfur

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.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...

Poisson's Ratio

Poisson's Ratio

Poisson's ratio is a material property that indicates their stress response. It explains the connection between the elongation or compression a material undergoes in the direction of an applied force and the contraction or expansion it experiences perpendicular to that force. When a slender bar is loaded axially, it stretches in the direction of the force and contracts laterally. Poisson's ratio is the negative ratio of this lateral contraction to the axial elongation. The negative sign...

Prochirality

Prochirality

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...

Stereoisomerism of Cyclic Compounds

Stereoisomerism of Cyclic Compounds

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,...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Molecular Dynamics Simulation of Single-Crystal Silicon CMP Using Ultrasonic Vibration-Assisted and Hollow Silica Abrasives.

Langmuir : the ACS journal of surfaces and colloids·2026

Same author

Mechanical Properties Analysis of Nickel-Based Composite Coatings Prepared by Laser Cladding.

Materials (Basel, Switzerland)·2025

Same author

Study on Process Parameters and Lap Ratio for Laser Cladding IN718 Repair of EA4T Steel.

Materials (Basel, Switzerland)·2025

Same author

Fabrication Process and Surface Morphology Prediction of Radial Straight Groove-Structured CBN Grinding Wheel by Laser Cladding.

Materials (Basel, Switzerland)·2025

Same author

Design and Implementation of a Biomimetic Underwater Robot Propulsion System Inspired by Bullfrog Hind Leg Movements.

Biomimetics (Basel, Switzerland)·2025

Same author

Design and realization of a low-drive bionic frog robot.

Bioinspiration & biomimetics·2025

Search research articles

Related Experiment Video

Updated: Oct 30, 2025

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

Published on: August 13, 2019

Study on a Chiral Structure with Tunable Poisson's Ratio.

Yanming Fu^1,2, Tianbiao Yu², Xin Wang³

¹Laboratory Management Center, Shenyang Sport University, Shenyang 110102, China.

Materials (Basel, Switzerland)

|July 2, 2021

Summary

This study designed a chiral structure with a negative Poisson's ratio, finding its properties tunable by adjusting hollow circle diameter. This makes it suitable for protective sports gear due to high energy absorption.

Keywords:

TPU elastic properties negative Poisson’s ratio structural

More Related Videos

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy

Published on: May 27, 2018

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

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

Published on: October 31, 2019

Related Experiment Videos

Last Updated: Oct 30, 2025

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

Published on: August 13, 2019

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy

Published on: May 27, 2018

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

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

Published on: October 31, 2019

Area of Science:

Materials Science
Mechanical Engineering
Metamaterials

Background:

Negative Poisson's ratio (auxetic) materials exhibit unique deformation characteristics.
Chiral structures offer design flexibility for tailored mechanical properties.

Purpose of the Study:

To design and investigate a chiral structure with a negative Poisson's ratio.
To explore the influence of hollow circle diameter on the Poisson's ratio and elastic modulus.
To validate simulation results with experimental data for potential applications.

Main Methods:

Finite element method (FEM) simulations were performed to analyze Poisson's ratio variation with hollow circle diameter (d = 0-4 mm).
Three-dimensional (3D) printing of thermoplastic polyurethane specimens with varying hollow circle diameters (d' = 0, 1, 3 mm).
Experimental measurement of Poisson's ratio and equivalent elastic modulus for 3D-printed samples.

Main Results:

Poisson's ratio was found to be highly sensitive to the hollow circle diameter, with a minimum simulated value of -0.43.
Experimental results showed an increase in Poisson's ratio and a decrease in equivalent elastic modulus with increasing hollow circle diameter.
FEM simulations and experimental measurements demonstrated good agreement.

Conclusions:

The designed chiral structure exhibits tunable negative Poisson's ratio properties.
Adjusting geometric parameters allows for modification of mechanical characteristics.
The structure's high energy absorption and tunable properties make it promising for protective sports gear.