many thanks for sharing this very interesting technical question with other RG members. We are organometallic chemists and never worked with thermochromic liquids. Thus I would not call myself an expert in this field of research. However, I often made the experience that is is really helpful to directly serach the publications section of RG for relevant literature references. Many useful article have been posted by RG members, some of them even as public full texts. For example, please have a look at the following potentially useful RG links:
Temperature sensing with thermochromic liquid crystals
Article Temperature sensing with thermochromic liquid crystals
and
An Alternative Technique for the Interpretation of Temperature Measurements Using Thermochromic Liquid Crystals
Article An Alternative Technique for the Interpretation of Temperatu...
Both papers can be freely downloaded as pdf files. Needless to say that these are not the only relevant literature references about this topic.
I hope this helps. Good luck with your work and best wishes, Frank Edelmann