Homeotropic orientation behavior of nematic liquid crystals induced by copper ions.
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.
Laboratory of Bioengneering, Chongqing Medical University, Chongqing 400016, People's Republic of China.
Guang
G
Li
Laboratory of Bioengneering, Chongqing Medical University, Chongqing 400016, People's Republic of China.
Bin
B
Gao
Laboratory of Bioengneering, Chongqing Medical University, Chongqing 400016, People's Republic of China.
Meng
M
Yang
Laboratory of Bioengneering, Chongqing Medical University, Chongqing 400016, People's Republic of China.
Long-Cong
LC
Chen
Laboratory of Bioengneering, Chongqing Medical University, Chongqing 400016, People's Republic of China. Electronic address: xlxiong@cqmu.edu.cn.
Xing-Liang
XL
Xiong
D015374:Biosensing Techniques / Q000379:methods*; D003300:Copper / Q000737:chemistry*; D007477:Ions; D050866:Liquid Crystals / Q000737:chemistry*; D009570:Nitriles / Q000737:chemistry; D063065:Organophosphonates / Q000032:analysis / Q000737:chemistry; D010472:Perchlorates / Q000737:chemistry; D015203:Reproducibility of Results; D013499:Surface Properties
D007477:Ions; D009570:Nitriles; D063065:Organophosphonates; D010472:Perchlorates; C062280:copper(II) perchlorate; D003300:Copper
Copper ions; Homeotropic orientation; Liquid crystal; Surface