The Study Of Finite Anchoring Liquid Crystal Device’s Optical Characteristic

Detection sensor technology which base on liquid crystals’special physical and chemical properties has became research hotspot in recent years. Comparing with other chemical detection technologies Liquid Crystal Chemical Sensors are simply, sensitive, inexpensive and portable. There has been proud research achievement of Liquid Crystal Chemical Sensors used in enviormental monitoring, life science, chemical weapon agents monitoring. However, reported liquid crystal chemical sensors which based on optical transmission change to detect organoamine required corrugation ultrathin gold films deposited on substrates, then assembled sensitive film on which liquid crystals could be in homogenous orientation, oblique deposition precious metals corrugation ultrathin films had problem in high cost and technique complicated. This article designed a simple process, low cost liquid crystal chemical sensor which could detect organoamine, through SAM process assembled sensitive film on substrates, then rubbed films on which liquid crystals could be in homogenous orientation, this sensor didn’t need corrugation ultrathin gold films. Specific works were done as following:1.Through SAM process assembled terminated-COOH film on glass substrates, and studied assembling process. Glass substrates were handled for hydroxylation, amination, carboxylation in order, and measured static contact angle to detect surface’s wettability in whole process. Results showed that in different assembling processes surface’s hydrophilicity were distinct.2.Studied nematic liquid E7 align orientation on sensitive film. Studied E7 align orientation on clean glass substrates before and after rubbing, amination’s glass substrates before and after rubbing,carboxylation’s glass substrates before and after rubbing. Results showed that E7 on rubbed amination’s glass substrates and rubbed carboxylation’s glass substrates was in homogenous orientation, speculating the reason through Comparing those above experimental phenomena was that corrugation generated by rubbing and hydrogen (nitrile group bond with -COOH group) combined effected. 3.Studied Liquid Crystal Chemical Sensor’s detection property. Based on liquid crystals’orientation change detecting the lowest volume concentration of butylamine was 0.1 ppm, and water, ethanol, actone, dimethylbenzene didn’t interfere liquid crystal’s orientation.