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Dynamic light scattering (DLS), sometimes referred to as Quasi-Elastic Light Scattering (QELS), is a non-invasive, well-established technique for measuring the size and size distribution of molecules and particles typically in the submicron region, and with the latest technology lower than 1nm.

Typical applications of dynamic light scattering are the characterization of particles, emulsions or molecules, which have been dispersed or dissolved in a liquid. The Brownian motion of particles or molecules in suspension causes laser light to be scattered at different intensities. Analysis of these intensity fluctuations yields the velocity of the Brownian motion and hence the particle size using the Stokes-Einstein relationship.

Dynamic light scattering technology from Malvern Instruments offers the following advantages:

  • Accurate, reliable and repeatable particle size analysis in one or two minutes.
  • Measurement in the native environment of the material.
  • Mean size only requires knowledge of the viscosity of the liquid.
  • Simple or no sample preparation, high concentration, turbid samples can be measured directly.
  • Simple set up and fully automated measurement.
  • Size measurement of sizes < 1nm.
  • Size measurement of molecules with MW < 1000Da.
  • Low volume requirement (as little as 2µL).
  • Compliance with regulatory standards ISO 13321, ISO 22412, 21 CFR Part 11.

Related products

Zetasizer range The worlds most widely used system for nanoparticle, colloid and protein size, zeta potential and molecular weight measurements. Image
Molecular size, Particle size, Molecular weight, Zeta potential
Temperature range
Particle size range
0.3nm to 10µm
Dispersion type
Dynamic Light Scattering, Static Light Scattering, Size Exclusion Chromatography, Electrophoretic Light Scattering
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The spontaneous emulsion formation (louching) effect Webinar - Recorded (English)

High alcohol based aniseed drinks (e.g. Absinthe, Ouzo, Raki, Sambuca) form a milky emulsion when water is added to them - the so-called Ouzo (or louche) effect. Adding alcohol to this emulsion recovers the clear solution. The size distribution is in...

Date recorded:
February 18 2015

Keywords: English Dynamic Light Scattering Laser diffraction Food and drinks Drinks Webinar - Recorded Eastern Time Nanoparticle Tracking Analysis 

Particle Size Masterclass 2: which technique is best for me? Webinar - Live (English)

In the second webinar in the particle size masterclass series, we will follow on from why you need to measure particle size, covered in the first masterclass, by looking at how to measure particle size. We’ll start with considerations for choosing a ...

March 19 2015

Keywords: English Particle size Dynamic Light Scattering Image analysis Laser diffraction Webinar - Live Eastern Time Nanoparticle Tracking Analysis 

Analytical strategies for inkjet formulation – A customer perspective Webinar - Recorded (English)

Analytical systems from Malvern Instruments are now used routinely to advance inkjet formulation at Domino Printing Sciences plc in the UK, one of the world’s leading printing technology companies. Domino are best known for printing “sell-by” dates o...

Date recorded:
February 12 2015

Keywords: English Rheology and viscosity Dynamic Light Scattering Gel Permeation Chromatography Paints, inks and coatings Webinar - Recorded Eastern Time 

Optimizing High-performance Ceramic Inkjet Inks Article (English)

This article highlights how engineering high performance ceramic inkjet inks relies on measuring viscosity across the broad range of shear rates experienced during printing. This shear range can be accessed by combining rotational rheometry for low s...

Keywords: English Article Kinexus range Zetasizer range Rheology and viscosity Dynamic Light Scattering Rheometry - rotational Paints, inks and coatings m-VROCi Rheometry - microfluidic flow 

Analytical strategies for ink formulation Whitepaper (English)

This white paper offers practical guidance on using a range of analytical techniques, including rheology, particle size and zeta potential measurement to assist in the formulation of Inkjet inks. 

Keywords: Films and coatings English Whitepaper Particle size Rheology and viscosity Dynamic Light Scattering Laser diffraction Rheometry - rotational Pigments and toners Paints, inks and coatings Rheometry - microfluidic flow 
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Particle Size Masterclass 2: which technique is best for me?
(March 19 2015)

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