Below you will find a series of movies that have been taken at different times over a period of some forty years. If you want to know more about the scientific content of each movie click on the “more info” top right hand corner marker for each movie. Below the movie in most cases you will find the scientific reference that relates to the work.
Carbon Nanotubes (CNTs) were all the rage in the 2000s and now have found niche rather than widespread application. This remarkable movie taken by Anson Ma shows how CNTs can aggregate during shear to form helical banding. The Movie was taken using a Linkam Cambridge Shear Cell and is an example of “expect the unexpected”, but seeing is believing!
Carbon Nanotube (CNT) aggregate Helical banding. Anson Ma 2005
In the 1990s I discovered that chocolate could be “cold extruded” and there was an exciting period at Cambridge where we pursued the science behind the concept and Nestle explored the commercial potential.
The movie below shows how chocolate can be “cold extruded” below its normal melting point using reasonably high pressure ( 200bar) ram extrusion,
Chocolate Cold Extrusion. Yu Wen Chen. 2000s
Cold extruded Flexible chocolate being tied in knots. Yu Wen Chen 2000s
Injection moulding of cold extruded chocolate 1990s
The “Ovaci Necklace ” chocolate extrusion instability 2000s
“Tomorrows World”, Flexible chocolate 1996
The effect of shear on carbon black aggregates. Kat Yearsley 2009
Flow birefringence within a Cross Slot geometry. David Hassell 2005
8hz 3mm 01Lmin
F10A1 ave vm f2
F10A2 resize 5
Flow splitting attempt Mineral oil water with 0 8mm needle
slug generation upstream
Osc Flow Adam Harvey 1995
DOW150R DGH3 160C 1mms 30 450