MICRO RHEOLOGY

Fullbrook Systems Ltd

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Rheolaser Lab®

 

Rheology measurement on multiple samples that is non destructive

A truly revolutionary approach to rheology

brochure Rheolaser-FSL.pdf

Rheolaser brochure

Measurement at rest

As absolutely no external stress is applied to the sample Rheolaser measurements are in the linear viscoelastic region

 

Micro Rheology is a new area in rheology that enables product characterisation on a micron scale. The viscoelastic properties of emulsions, gels, polymers etc can be analysed with the Rheolaser

Easy sample handling

- Measure 1 - 6 samples at the same time  

- Sample is contained in a glass cell

- Temperature control

- No geometry

- No evaporation

- Disposable cells mean No Cleaning!

- Test the same sample again and again

 

Micro structure analysis

- Viscous modulus

- Elastic Modulus

- Relaxation time

- Mesh size

 

Laser

Sample set up

Multi pixel

detector

Scattering

Measurement Principle

Light source

Interfering waves

Speckle image

Diffusing Wave Spectroscopy is the dynamic Multiple Light Scattering measurement which records parti­cles motion in concentrated and opaque fluids.

The RheoLaser uses Multi speckle difusing wave spectroscopy  (MS-DWS)  which consists of sending a co­herent laser light beam into the sam­ple. The light is multi-scattered by the particles in the sample, generating interfering backscattered waves. An interference image called “Speckle image” is detected by a multi-pixels detector. In a soft material, the internal thermal energy kBT causes the motion of micron sized particles .

This Particle Brownian motion in­duces a deformation of the speckle image. The multi pixel detector records the speckle pattern deformation to quantify the particle motion speed.

Meassurement principle

What is DWS?