Temperature indicator using the smectic c phase of a liquid crystal
Abstract
Abstract TEMPERATURES MAY SOMETIMES BE QUICKLY AND CONVENIENTLY SENSED AND/OR MAPPED WITH THE USE OF A VARIABLE-TILT COMPOUND OF THE SMECTIC C MESOMORPHIC PHASE. DISCLOSED ARE SEVERAL ORGANIC COMPOUNDS THAT ARE CAPABLE, WITHIN CERTAIN TEMPERATURE RANGES, OF EXHIBITING SUCH A PHASE, SUCH AS TEREPHTHAL-BIS(4-N-BUTYLANILINE) AND OTHER COMPOUNDS RESULTING FROM THE REACTION OF TEREPHTHALDEHYDE WITH AMINES OR AMIDES OF THE FORMULA: 1-R,4-A-BENZENE WHERE A IS -NH2 OR -CONH2 AND R IS A SATURATED ALKYL OR ALKOXY GROUP CONTAINING 1-12 CARBON ATOMS. THE COMPOUND IS MADE, APPLIED TO A SURFACE THAT HAS BEEN RUBBED UNIDIRECTIONALLY, AND THEN (WHILE THE COMPOUND IS WITHIN ITS SMECTIC C PHASE TEMPERATURE RANGE) VIEWED IN LIGHT THAT IS POLARIZED PLANARLY OR CIRCULARLY. THE TEMPERATURE INDICATION IS SENSITIVE TO CHANGES IN TEMPERATURE THAT ARE QUITE SMALL, AND THE RESPONSE PATTERN IS EXCEPTIONALLY RAPID (BEING ON THE ORDER OF A MILLISECOND AT THE GREATEST), SINCE NO MOLECULAR REARRANGEMENT IS INVOLVED.
Inventors
- 👤 T Taylor
- 👤 J Fergason
Bibliographic Details
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