Study of emulsion-based systems by Diffusing wave spectroscopy (DWS) (CAT#: STEM-MB-0839-WXH)

Name: Study of emulsion-based systems by Diffusing wave spectroscopy (DWS)
SKU: STEM-MB-0839-WXH
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Introduction

Food emulsions offer another ideal opportunity for the use of DWS. They are highly turbid and in some cases also exhibit gelation or phase separation. The main area of study by DWS has been the behaviour of protein-stabilized emulsions in the presence of biopolymers. Depending on circumstances, these materials can either bind to the emulsion droplets or provoke depletion flocculation and phase separation effects.

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Principle Applications Procedure Materials

Principle

Diffusing-wave spectroscopy (DWS) is an optical technique derived from dynamic light scattering (DLS) that studies the dynamics of scattered light in the limit of strong multiple scattering. DWS is able to give information about the local dynamics of particle dispersion in a highly turbid medium. It has been widely used in the past to study colloidal suspensions, emulsions, foams, gels, biological media, and other forms of soft matter. If carefully calibrated, DWS allows the quantitative measurement of microscopic motion in a soft material, from which the rheological properties of the complex medium can be extracted via the microrheology approach.
The technique of DWS depends on the scattering of light from highly turbid suspensions. A sample of the suspension is illuminated by light from a laser and the incoming photons are multiply scattered. This scattered light is detected and subjected to autocorrelation analysis.

Applications

• Diffusing Wave Spectroscopy (DWS) is an advanced light scattering technique, which is primarily applied for microrheology and particle sizing.
• DWS has been applied in biomedical and clinical areas, especially in monitoring cerebral blood flow (CBF).