한국정보디스플레이학회:학술대회논문집

The Korean Infomation Display Society (한국정보디스플레이학회)
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FTIR study of E7 liquid crystals confined to cylindrical cavities of Anodisc membranes

  • Ha, Ki-Ryong (Dept. of Chemical Engineering, Keimyung University) ;
  • Ahn, Hee-Jun (Dept. of Chemical Engineering, Keimyung University) ;
  • Jung, Kwang-Wook (Dept. of Chemical Engineering, Keimyung University) ;
  • Ahn, Won-Sool (Dept. of Chemical Engineering, Keimyung University) ;
  • West, John L. (Liquid Crystal Institute, Kent State University)
  • Published : 2003.07.09
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Abstract

Orientation of E7 liquid crystals (LCs) confined to 200 nm-diameter cylindrical cavities of Anodisc membranes are investigated by FTIR dichroism techniques. The cavity walls of the confining pores are chemically modified with different aliphatic acids ($C_nH_{2n+1}COOH$, n=5, 6, 7, 9). From the FTIR spectra of aliphatic acid treated alumina Anodsic membranes, we found the salt formation between -COOH group of aliphatic acid and Anodisc membrane. From the FTIR spectra of LC filled Anodisc membranes, we found abrupt alignment direction change of LC molecules between n=6 and 7 for 2% aliphatic acid treated Anodisc membranes, from parallel to perpendicular direction to the cavity walls. But 4% aliphatic acid treated Anodisc membranes, alignment direction of LC molecules changed between n=5 and n=6, from parallel to perpendicular direction. The same trend was observed for $^2H-NMR$ measurements.

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