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  • Title: Homeotropic orientation behavior of nematic liquid crystals induced by copper ions.
    Author: Li G, Gao B, Yang M, Chen LC, Xiong XL.
    Journal: Colloids Surf B Biointerfaces; 2015 Jun 01; 130():287-91. PubMed ID: 25935262.
    Abstract:
    A homeotropic ordering film of nematic liquid crystal (LC) induced by copper ions (Cu(2+)) had been developed. The Cu(ClO4)2 was directly spin-coated on the glass substrate without any other chemical modification. A homeotropic orientation of LC thin-film was generated by the interfacial chemical interaction between nitrile-containing LC and copper ions on the surface. Results showed that an appropriate density of Cu(2+) could shorten the response time of orientation, but a shelf-time was prolonged. The LC film fabrication not only offered a simple process, but also presented a great repeatability to detect organophosphonates (DMMP). This study provided guidance for the design of LC films responding to organic molecules as a biosensor.
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