Premium
An evaluation of thermochromic prints based on microencapsulated liquid crystals using variable temperature colour measurement
Author(s) -
Christie Robert M,
Bryant I David
Publication year - 2005
Publication title -
coloration technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 1472-3581
DOI - 10.1111/j.1478-4408.2005.tb00271.x
Subject(s) - thermochromism , liquid crystal , lightness , hue , materials science , phase (matter) , optics , isotropy , liquid crystal display , wavelength , crystallography , optoelectronics , chemistry , organic chemistry , physics
A variable temperature colour measurement technique has been developed to characterise the temperature‐dependent colour change, known as ‘colour play’, observed with thermochromic prints based on microencapsulated liquid crystals. The effect is most pronounced over a black background. The liquid crystals exhibiting the thermochromic effect adopt a chiral nematic phase with an underlying smectic A phase. A variety of methods for presenting and interpreting the data obtained, as the colour of the print passes through the spectrum, is explored. The effect of temperature on the wavelength of reflected light, a * b