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Related Concept Videos

X-ray Crystallography02:18

X-ray Crystallography

The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
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Atomic Force Microscopy01:08

Atomic Force Microscopy

Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
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X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal crystal...
Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

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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Related Experiment Video

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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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Coordination-dependent surface atomic contraction in nanocrystals revealed by coherent diffraction.

W J Huang1, R Sun, J Tao

  • 1Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.

Nature Materials
|March 11, 2008
PubMed
Summary
This summary is machine-generated.

Surface atoms in gold nanocrystals undergo significant, facet-dependent relaxation. This atomic rearrangement differs markedly from bulk surfaces, revealing unique structural dynamics in nanomaterials.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Science

Background:

  • Surface atoms exhibit unique behavior due to fewer bonds compared to bulk atoms.
  • Surface relaxation and reconstruction are well-studied on extended surfaces but less understood in nanocrystals.

Purpose of the Study:

  • To investigate the surface atomic structures of individual gold (Au) nanocrystals.
  • To understand the relaxation and reconstruction phenomena at nanocrystal surfaces.

Main Methods:

  • Utilized coherent diffraction patterns from individual Au nanocrystals (3-5 nm diameter).
  • Analyzed diffraction intensity oscillations around Bragg peaks.
  • Employed data modeling and molecular dynamics simulations.

Main Results:

  • Observed inhomogeneous atomic relaxations on nanocrystal surfaces.
  • Identified large out-of-plane bond length contractions (~0.2 Å) for edge atoms.
  • Quantified significant contraction (~0.13 Å) for {100} surface atoms and smaller contraction (~0.05 Å) for {111} facet atoms.

Conclusions:

  • Nanocrystal surface structures are highly sensitive to atomic arrangements.
  • Surface relaxation is coordination and facet-dependent in nanocrystals.
  • Nanocrystal structural dynamics significantly differ from bulk crystalline surfaces.