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Related Concept Videos

Bending of Members Made of Several Materials01:11

Bending of Members Made of Several Materials

In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
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...
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...
Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.

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Related Experiment Video

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Dissection and 2-Photon Imaging of Peripheral Lymph Nodes in Mice
16:48

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Published on: August 23, 2007

Two-photon materials with large two-photon cross sections. Structure-property relationship.

Hwan Myung Kim1, Bong Rae Cho

  • 1Department of Chemistry, Korea University, 1-Anamdong, Seoul 136-701, Korea.

Chemical Communications (Cambridge, England)
|December 23, 2008
PubMed
Summary
This summary is machine-generated.

This review explores structure-property relationships in two-photon materials. It offers guidance for designing efficient materials for optical limiting and 3D microfabrication.

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Area of Science:

  • Materials Science
  • Optics
  • Chemistry

Background:

  • Two-photon materials have seen rapid development in the last decade.
  • Potential applications include optical limiting, 3D microfabrication, and multiphoton microscopy.

Purpose of the Study:

  • To review structure-two-photon absorption property relationships.
  • To provide a guideline for designing efficient two-photon materials.

Main Methods:

  • Review of existing literature on molecular structures and their two-photon absorption properties.
  • Analysis of structure-property relationships for various molecular architectures.

Main Results:

  • Exploration of structure-property relationships in dipolar, quadrupolar, and octupolar molecules.
  • Examination of derivatives of triphenylamine, [2.2]paracyclophanes, multi-annulenes, and porphyrins.

Conclusions:

  • Understanding molecular structure is crucial for optimizing two-photon absorption.
  • This review serves as a guide for the rational design of advanced two-photon materials.