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Philip Rolfe
Philip has been a Rheology Specialist at Malvern Instruments with nearly 20 years of experience in solving industrial rheology problems, training and assisting with sales. He received a first class honors degree from the University of Plymouth, before going on to gain his Chartered Chemist, MRSC and Chartered Scientist qualifications.

Kinexus, Rheology, Tech Talk »

[8 Jun 2017 | ]

How to best measure a viscosity flow curve?
 
Choosing the right measuring geometry and preventing measurement artifacts
There are several ways to obtain viscosities at different shear rates using a rotational rheometer. For instance, we could gently ramp through the different speeds starting at the lowest and ending at the highest (good for a quick measurement where time is of the essence).  Alternatively, we could step through the required shear rates as discussed later, while waiting for a steady state viscosity at each step.  This is known as generating an equilibrium flow …

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Kinexus, Rheology, Tech Talk »

[17 Jan 2017 | ]

Why measure a viscosity flow curve, rather than just give a number?
 

Very often chemists are asked to provide a single viscosity value for a product or formulation without much information about the required conditions of the measurement.  For an oil or low viscosity liquid which is Newtonian this is pretty straightforward, so long as your viscometer is properly calibrated and the measurement temperature is provided. However, most industrially interesting or complex fluids such as polymer solutions, suspensions and emulsions are non-Newtonian, meaning that their viscosity varies with shear rate – …

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[29 Nov 2011 | ]
A memorable evening

Held in Cleveland, Ohio, on October 9 – 13, 2011, this year’s Society of Rheology Conference was another great success thanks to the organization of Jonathan Rothstein, Victor Breedveld, Patrick Mather and Andy Kraynik, with a crowd drawn from all over the world.
Plenary speakers included Eric Shaqfeh (also Bingham award winner this year) who spoke on the rheology of vesicle and capsule suspensions.  Other plenary lectures were from Juan J. de Pablo who educated us on directed assembly of complex fluids and its application to nanoscale fabrication, David Pine mused …

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Malvern Panalytical Events »

[6 Oct 2011 | ]
Flow time!!

Hello –  this is my first blog for Malvern and I should start by telling you something about myself. Originally from the UK, I am Rheology Technical Specialist at Malvern Instruments in the US and I live and work near Boston; a great city, famous for baseball (RedSox), beer (Sam Adams), Harvard and MIT Universities and baked beans. I organise the Rheology Focus Forum for Malvern and if anyone has any topics for discussion or questions about being involved in this please let me know.
Rheology Society meeting, Cleveland, Ohio
I am currently …

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