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Related Concept Videos

Colloids and Suspensions01:17

Colloids and Suspensions

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
Colloids03:22

Colloids

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
Electromagnetic Waves in Matter01:30

Electromagnetic Waves in Matter

Electromagnetic waves can travel in the vacuum as well as in matter. For example light, which is an electromagnetic wave, can travel through air, water, or glass.
Consider the electromagnetic wave passing through a dielectric medium. In such a case, Maxwell's equations get modified. In Ampere's law, ε0 , the dielectric permittivity of free space is replaced with ε, the permittivity of dielectric. Also, the vacuum permeability μ0 is replaced by the permeability of the medium, μ.
Furthermore, the...
Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...

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Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
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Collective hypersonic excitations in strongly multiple scattering colloids.

T Still1, G Gantzounis, D Kiefer

  • 1Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.

Physical Review Letters
|June 4, 2011
PubMed
Summary

Researchers observed unique acoustic waves in dense suspensions of hard particles. These slow sound waves, arising from multiple scattering in closely packed colloids, offer new possibilities for phononics research.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Acoustics

Background:

  • Acoustic wave propagation in colloidal suspensions is crucial for understanding material properties.
  • Dense suspensions present complex scattering phenomena that are challenging to model.
  • Exploring phononic properties of nanostructured materials is an emerging field.

Purpose of the Study:

  • To investigate and characterize low-dispersion, high-frequency acoustic excitations in dense colloidal suspensions.
  • To compare experimental findings with theoretical models for phononic band structures.
  • To understand the origin and behavior of slow phonons in these systems.

Main Methods:

  • Experimental observation of acoustic excitations in SiO(2) particle suspensions.
  • Systematic variation of particle size and volume fraction.
  • Rigorous full-elastodynamic multiple-scattering calculations.

Main Results:

  • Observed unprecedented low-dispersion high-frequency acoustic excitations.
  • Experimental phononic band structures were accurately predicted by theoretical calculations.
  • Identified slow phonons localized in the liquid medium, arising from coherent multiple scattering at high densities.

Conclusions:

  • Coherent multiple scattering in dense colloids leads to novel acoustic phenomena.
  • The observed slow phonons are a result of collective scattering effects, not individual particle resonances.
  • These findings highlight the potential of phonon-matter interactions in nanostructures for advancing phononics.