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Metallic Solids

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...

Structures of Solids

Structures of Solids

Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...

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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

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Published on: May 29, 2018

Assembly, structure and optical response of three-dimensional dynamically tunable multicomponent superlattices.

Huiming Xiong¹, Matthew Y Sfeir, Oleg Gang

¹Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States.

|October 1, 2010

Summary

Researchers created optically active 3D superlattices using DNA linkers, nanoparticles, and chromophores. Ionic strength changes dynamically tuned the superlattice structure, significantly altering the chromophore

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Area of Science:

Nanotechnology and Materials Science
Biomolecular Engineering
Optical Physics

Background:

Precise assembly of nanoscale components is crucial for advanced optical materials.
DNA nanotechnology offers a versatile platform for constructing complex, ordered structures.
Controlling inter-component distances is key to tuning optical properties.

Purpose of the Study:

To fabricate optically active three-dimensional (3D) superlattices with DNA-encoded components.
To investigate the dynamic tunability of superlattice structure and its impact on optical response.
To establish structure-property relationships in nanoparticle-chromophore assemblies.

Main Methods:

Fabrication of 3D superlattices using DNA linkers, metallic nanoparticles, and molecular chromophores.
Small-angle X-ray scattering (SAXS) for structural analysis of 3D arrays.
In situ modulation of inter-component distances via ionic strength changes.

Main Results:

Successful fabrication of well-defined 3D superlattices with DNA-encoded components.
Demonstrated reversible structural contractions and expansions modulated by ionic strength.
Observed a nearly threefold change in chromophore emission rate due to structural tuning.

Conclusions:

DNA linkers enable dynamic structural control in 3D superlattices.
Superlattice dynamics significantly influence optical properties, particularly emission rates.
Experimental findings align with theoretical models of chromophore-plasmonic nanoparticle coupling.