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Related Concept Videos

Chirality02:25

Chirality

29.3K
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

Chirality in Nature

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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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Phase Transitions02:31

Phase Transitions

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Properties of Transition Metals02:58

Properties of Transition Metals

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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

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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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Related Experiment Video

Updated: Jan 26, 2026

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

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Chiral Metamolecules with Active Plasmonic Transition.

Tiantian Man1, Wei Ji1, Xiaoguo Liu2

  • 1Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering , East China Normal University , 500 Dongchuan Road , Shanghai 200241 , People's Republic of China.

ACS Nano
|April 10, 2019
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate transient self-assembly of active chiral plasmonic metamolecules (CPMs) using chemical reactions. This method allows for controlled, dynamic structures and tunable chiroptical properties in advanced materials.

Keywords:
DNA nanotechnologychemical reaction networkchiral metamoleculesplasmonictransient self-assembly

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Last Updated: Jan 26, 2026

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Energy-dissipating self-assembly is crucial for cellular functions like organization and morphogenesis.
  • Controlling assembly kinetics offers pathways for advanced molecular materials with intelligent, programmed behaviors.

Purpose of the Study:

  • To demonstrate the transient self-assembly of active chiral plasmonic metamolecules (CPMs).
  • To achieve temporal control and adaptive tuning of plasmonic metamolecule (PM) structures and chiroptical properties.

Main Methods:

  • Utilized a positive-feedback chemical reaction network to generate proton flux.
  • Controlled the fuel-conversion kinetics to manage assembly processes.
  • Investigated the self-assembly of chiral plasmonic metamolecules (CPMs).

Main Results:

  • Achieved transient self-assembly of CPMs driven by chemical reaction kinetics.
  • Demonstrated autonomous tuning of chiroptical properties in dynamic metamolecule systems.
  • Assembled 11 distinct spatial configurations and differentiated 9 temporal configurations of CPMs.

Conclusions:

  • Transient self-assembly controlled by chemical kinetics offers a novel approach for creating dynamic metamaterials.
  • This method enables precise control over structure and optical properties, paving the way for intelligent molecular materials.