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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.

Chirality

Chirality

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...

The Colloidal State

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...

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Related Experiment Video

Updated: May 4, 2026

Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates

Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates

Published on: March 5, 2019

3D plasmonic chiral colloids.

Xibo Shen¹, Pengfei Zhan, Anton Kuzyk

¹National Center for Nanoscience and Technology, No. 11 BeiYiTiao, ZhongGuanCun, Beijing 100190, China. dingbq@nanoctr.cn.

|January 16, 2014

Summary

This summary is machine-generated.

Researchers created 3D plasmonic chiral colloids using gold nanorods on DNA origami. These structures show strong circular dichroism (CD) tunable by adjusting nanorod positions, matching theoretical predictions.

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Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates

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Area of Science:

Plasmonics
Nanotechnology
Biophysics

Background:

Chiral nanomaterials offer unique optical properties.
DNA origami provides precise nanoscale assembly capabilities.
Plasmonic nanostructures are crucial for light-matter interactions.

Purpose of the Study:

To synthesize 3D plasmonic chiral colloids.
To investigate the tunability of circular dichroism (CD) in these structures.
To validate experimental findings with theoretical models.

Main Methods:

Deterministic assembly of two gold nanorods (AuNRs) on DNA origami scaffolds.
Characterization of optical properties, specifically circular dichroism (CD).
Engineering CD response by altering nanorod positions.

Main Results:

Successfully synthesized 3D plasmonic chiral colloids.
Observed strong CD signals at optical frequencies.
Demonstrated tunability of CD by precise positional control of AuNRs on DNA origami.

Conclusions:

3D plasmonic chiral colloids can be precisely engineered using DNA origami.
The observed CD properties are highly sensitive to nanorod arrangement.
Experimental results align well with theoretical predictions, validating the design approach.