CHEM 1211K Lecture Notes - Watch, Cholesteric Liquid Crystal, Liquid Crystal
Document Summary
Waste: put all tape samples and toothpicks onto the waste box in the hood. The cholesteric liquid crystal mixture may have to be warmed gently on a hot plate to see the colors: cover/title-5 pts. Preparation and testing of nematic liquid crystal sandwich. Using mbba: hold two pieces of polarizing film up to the room lights and rotate one 90o. Question to answer with observations: what are the films doing to the light? (5pts: put a tape blank behind the polarizing films and rotate one film back and forth. Why or why not? (5pts: put a tape blank between the polarizing films and rotate one film back and forth. Question to answer with observations: does the front polarizing film absorb all of the light when rotated. Why or why not? (5pts: put a tape mbba sample in between the polarizing films and rotate one film back and forth.
