Tom Kelly and William Pitcher, featured ILCC liquid crystal artists, November 2014
The picture is the result of heating a planar cell containing the nematic liquid crystal pentylcyanobiphenyl (5CB) from room temperature at 2 degrees celsius/min to find the transition temperature of the liquid crystal. The picture was taken when the crystal was at 38.7 degrees celsius and exhibits the schlieren texture observed in nematic liquid crystals. The texture shows dark bands, which corresponds to the orientation of the liquid crystal becoming extinct. The bands meet at points called defects with strengths +1,-1,+1/2 or -1/2. Where 4 bands meet indicates a defect with strength +1 or -1 and where two bands meet indicates a defect with +1/2 or -1/2. The colour spectrum arises from the glass plates of the cell not being perfectly aligned. The picture was taken through cross polarisers and has an area of ~57x43 micrometers.
Jury comment: The simplest beautiful pattern in liquid crystal: colors and defects!
Jury comment: The simplest beautiful pattern in liquid crystal: colors and defects!