Author Archives: Sarennah Longworth-Cook


Dr Sarennah Longworth-Cook is product technical specialist for laser diffraction based at our UK headquarters. With 12 years' experience in characterization labs Sarennah is dedicated to helping our customers make high quality and meaningful measurements.

Published 30 Apr 2019

Around the world in 80 particles – Part 2

When I was first offered my job as a product technical specialist at Malvern Panalytical (was Malvern Instruments at the time), I called my parents to tell them all about it. Because my mum is of the age where girls…READ MORE >

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Published 27 Mar 2019

Coughs and sneezes spread diseases

At this time of year, offices ring with the sound of sneezes, snuffles and coughs. I’m sure I’m not the only one who sometimes wishes a colleague who is producing lots of these sounds had stayed at home, for fear…READ MORE >

Published 1 Aug 2017

The Mysterious Case of the Musca Domestica Contaminant

Just when I thought I’d seen everything that could contaminate the background, a user sent me this picture! The Musca Domestica (common housefly) was attracted by certain aromatics used in testing and seems to have entered the measurement cell through…READ MORE >

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Published 9 Aug 2016

Laser Diffraction: My Top Q&A

Laser Diffraction – Q&As As a product technical specialist at Malvern Instruments with over 12 years’ experience working in the material characterization industry, I thought I would share with you the questions and answers that I receive the most. Here…READ MORE >

Published 13 Aug 2015

Laser Diffraction: How much sample do I need?

One of the questions I am regularly asked by my Mastersizer customers is how much sample do I need to measure? I get the feeling people are hoping for a simple answer, such as 1g, 10ml etc. Unfortunately, the science…READ MORE >

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Published 16 Jun 2015

A to Z of Industrial Applications – B is for…

Batteries, and the chargers for them, are everywhere. They are available in a wide range of specifications using a variety of chemistries. The characteristics of the battery are determined by the particle size of the electrolyte powder, or slurry, and…READ MORE >

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Published 28 May 2015

How do you measure the particle size of a volcanic ash cloud?

I was stuck in traffic on the M8 travelling between Edinburgh and Glasgow when a news item really pricked my ears up. Scientists from Edinburgh University’s school of GeoSciences have been investigating better ways of measuring the extent of ash…READ MORE >

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Published 10 Feb 2015

The wonder of capturing laser beams in flight

As a confirmed space-geek ever since Halley’s Comet in 1986, lasers, or perhaps I should say laser guns in their various forms, have always been a part of my life. I’m not sure if I first met lasers in Star…READ MORE >

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Published 19 Dec 2014

Sizing up the future

I’m just back from DDL25, the Drug Delivery to the Lungs conference in Edinburgh. Unlike previous years the snow wasn’t here to stay and we were able to enjoy the conference without too many meteorological distractions. It was the 25th DDL…READ MORE >

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