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Imperfections in Crystal Structure: Stoichiometric Point Defects

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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...

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A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...

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Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis

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Enzymatically Controlled Vacancies in Nanoparticle Crystals.

Stacey N Barnaby^1,2, Michael B Ross^1,2, Ryan V Thaner^1,2

¹Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208, United States.

|July 19, 2016

Summary

This summary is machine-generated.

Researchers explored nanoparticle superlattices, using DNA and RNA as programmable bonds. They demonstrated selective removal of RNA bonds, creating vacancies without altering nanoparticle structure, offering new control over nanoscale materials.

Keywords:

RNA Superlattices crystals enzymes nanoparticles vacancies

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Area of Science:

Nanotechnology and Materials Science
Biomolecular Engineering

Background:

In atomic systems, material properties depend on atom identity and bonding.
Nanoscale systems offer programmable bonding using oligonucleotides, decoupling atom identity from bonding characteristics.
Understanding how nanoscale bond changes affect nanoparticle crystal phase behavior is crucial.

Purpose of the Study:

To investigate the effect of altering nanoscale bonding elements on nanoparticle superlattice phase behavior.
To demonstrate the selective and dynamic modification of nanoparticle crystals by changing bonding elements.
To explore the creation of controlled vacancies within nanoparticle superlattices.

Main Methods:

Synthesizing nanoparticle superlattices using mixed DNA and RNA bonding elements.
Employing selective and enzymatic hydrolysis to remove RNA bonding elements.
Characterizing the structural integrity and vacancy formation in the modified superlattices.

Main Results:

Successfully assembled single crystal nanoparticle superlattices with mixed DNA/RNA bonds.
Demonstrated dynamic structural changes via selective RNA bond hydrolysis.
Achieved up to 35% random vacancy incorporation while preserving crystal structure and habit.

Conclusions:

Nanoscale bonding elements (DNA/RNA) can be selectively and enzymatically addressed without affecting nanoparticle identity.
This provides a method for dynamic control over nanoparticle superlattice structure and properties.
Offers new possibilities for designing and fabricating complex nanoscale architectures.