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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
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other axis.
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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...

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Updated: May 12, 2026

High-Resolution Neutron Spectroscopy to Study Picosecond-Nanosecond Dynamics of Proteins and Hydration Water
08:48

High-Resolution Neutron Spectroscopy to Study Picosecond-Nanosecond Dynamics of Proteins and Hydration Water

Published on: April 28, 2022

Cation bridging studied by specular neutron reflection.

Xiaofan Wang1, Seung Yeon Lee, Kathryn Miller

  • 1BP Institute and Department of Chemistry, University of Cambridge, Cambridge, UK.

Langmuir : the ACS Journal of Surfaces and Colloids
|April 4, 2013
PubMed
Summary
This summary is machine-generated.

Divalent ions enable anionic surfactant adsorption onto anionic surfaces, unlike monovalent ions. This adsorption is explained by a bridging mechanism, crucial for understanding surface interactions.

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Area of Science:

  • Surface Chemistry
  • Colloid Science
  • Materials Science

Background:

  • Anionic surfactants and surfaces typically exhibit electrostatic repulsion.
  • Understanding adsorption mechanisms is key for applications in formulations, coatings, and separations.

Purpose of the Study:

  • To investigate the adsorption of anionic surfactants onto anionic surfaces.
  • To elucidate the role of counter-ions in mediating this adsorption process.

Main Methods:

  • Specular neutron reflection (NR) for interfacial structure analysis.
  • Attenuated total internal reflection infrared spectroscopy (ATR-IR) for molecular identification.

Main Results:

  • Adsorption of anionic surfactant onto an anionic surface was observed only with the addition of divalent ions.
  • No significant adsorption was detected with monovalent ions, despite higher surfactant concentrations.
  • Experimental data supports the bridging mechanism of ion binding.

Conclusions:

  • Divalent ions are essential for overcoming electrostatic repulsion and enabling anionic surfactant adsorption onto anionic surfaces.
  • The bridging mechanism, involving divalent ions, effectively explains the observed adsorption phenomenon.
  • Findings provide insights into controlling interfacial properties through ion manipulation.