Tag Archives: QELS

What is the standard for dynamic light scattering? How can we ensure compliance with recommended light scattering quality standards? Is there an international standard for light scattering? Recently an interesting question arrived at our help desk about the validity of…READ MORE >

How good can a gold standard be?   When performing dynamic light scattering (DLS) measurements, we sometimes encounter especially nice data. An interesting issue to consider is the level of data quality one can expect to achieve. What is the…READ MORE >

The term polydispersity (or more recently dispersity without the poly, as per IUPAC recommendation) is used to describe the degree of “non-uniformity” of a distribution.  In the field of molecular/nanoparticular characterization, there are in principle two different definitions of polydispersity,…READ MORE >

“What is dynamic light scattering?” Find out in less than 5 minutes! Although we’ve gone into deeper detail in previous posts , every once in a while it’s nice to recap on the basics. A few years ago, our presentation “Dynamic Light…READ MORE >

In the Malvern Zetasizer software we measure the intensity auto-correlation function. This is obtained from correlating the scattering intensity with itself. The resulting intensity auto-correlation function is often denoted by the symbol G2(τ) in its normalized form. For Gaussian scattering,…READ MORE >

How do I know the minimum concentration needed for measuring the size of my protein? We are asked this question all the time when we are demonstrating the Zetasizer.  Happily, if the Zetasizer software is installed (and it can be…READ MORE >

Are you aware that the Zetasizer microV as well as the Zetasizer Nano ZSP can easily acquire molecular size data in flow? Here, ‘in flow’ means: continuously during a chromatography elution profile. So while in standard “batch” mode a cuvette…READ MORE >

While at  the Malvern exhibit at Pittcon quite a few visitors to our booth have asked where to find the latest software version for the Malvern Zetasizer Nano series. And we also encountered a similar question at the Short Course #…READ MORE >