Tyndall scattering effect

Tyndall scattering also causes the blinding effect of shining a car headlight directly into a thick bank of fog or mist it also yields the beautiful iridescent colours on the wing of a butterfly or peacock tail, and an opal and mother of pearl. A good potter can reproduce some of these optical effects with so-called iridescent glazes, which comprise colloidal materials. 

Tyndall effect the scattering effect caused when light passes through a colloid. (Chap. 13, p. 472)... 

Tyndall effect Visualization of colloidal particles in a fluid in the path of a light beam by light-scattering effects. 

Spectroscopic examination of light scattered from a monochromatic probe beam reveals the expected Rayleigh, Mie, and/or Tyndall elastic scattering at unchanged frequency, and other weak frequencies arising from the Raman effect. Both types of scattering have appHcations to analysis. 

A colloid fog will scatter a beam of light. This is called the Tyndall Effect and can be used as a troubleshooting tool. 

Colloids will reflect or scatter light while true solutions do not this is known as the Tyndall effect. 

If a beam of light is passed through a colloidal solution, the colloidal particles will reflect or scatter the light so that the beam becomes visible when the solution is viewed from the side against a dark background. This Tyndall effect is used in the ultramicroscope. 

But the microscopic fat particles suspended in milk have an average diameter in the range 10-7 to 10-5 m, i.e. much larger than k of visible light. A beam of incident light is scattered rather than transmitted by a suspension of particles - a phenomenon known as the Tyndall effect. 

The study of the scattering of light by colloidal systems has a long history. The Tyndall effect describes the scattering of light by suspended particles. In fact, the first rigorous theory was that of Rayleigh in 1871. 

We call the centre of the concentration range the critical micelle concentration (CMC). As an over-simplification, we say the solution has no colloidal micelles below the CMC, but effectively all the monomer exists as micelles above the CMC. As no micelles exist below the CMC, a solution of monomer is clear - like the solution of dilute soap in the bath. But above the CMC, micelles form in solution and impart a turbid aspect owing to Tyndall light scattering. This latter situation corresponds to washing the face in a sink. 

Blue skies and the Tyndall effect by M. Kerker in/. Chem. Educ., 1971, 48, 389 is a nice introduction. Alternatively, try Chapter 7 Some important properties of colloids II scattering of radiation in Everett (above), which is extremely thorough. 

Tyndall effect The scattering of light as it passes through colloidal suspensions. 

Tyndall Effect scattering of light by fine particles in a suspension Unit Cell most basic repeating unit of a lattice structure... 

Some samples of natural origin contain micellar particles in suspension that cause, by light scattering (the Tyndall effect), a supplementary absorbance that varies with wavelength. 

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