분자 확산에 의한 콜레스테릭 액정 필름의 피치 변화

권영진; 이원주; 김범경; 김인선; 송기국; Youngjin Kwon; Wonju Lee; Beomkyung Kim; Insun Kim; Kigook Song

Polymer(Korea), Vol.30, No.5, 422-425, September, 2006

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분자 확산에 의한 콜레스테릭 액정 필름의 피치 변화

Pitch Variations in Cholesteric Liquid Crystal Film by Molecular Diffusion

권영진, 이원주, 김범경, 김인선¹, 송기국 ^†

경희대학교 영상정보소재기술 연구센터
¹아이컴포넌트

Youngjin Kwon, Wonju Lee, Beomkyung Kim, Insun Kim¹, and Kigook Song^†

Materials Research Center for Information Display, Kyung Hee University, Yongin, Gyeonggi-do 449-701, Korea
¹I-components, Pyongtaek, Gyeonggi-do 451-802, Korea

E-mail:

초록

콜레스테릭 액정은 주기적인 나선구조 때문에 빛을 선택적으로 반사하는 특성을 보이는데, 반사파장 대역이 넓은 cholesteric liquid crystal(CLC) 필름을 서로 다른 피치를 가지는 두 cyclic siloxane CLC의 열확산이나 저분자 물질에 의한 확산을 이용하여 제조하였다. 확산에 의한 CLC 액정 셀 내에 형성된 다양한 CLC 피치 분포를 SEM으로 관찰하였고, UV/Vis spectrometer를 이용하여 CLC 피치 분포 변화를 조사하였다.

Due to their periodic helical structure, cholesteric liquid crystals (CLC) have a unique ability to selectively reflect visible light. CLC films reflecting a broad wavelength band were prepared by inducing a pitch gradient in CLC layers through a diffusion of small molecules and through a thermal mixing of cyclic siloxane CLC molecules with different pitch lengths. Various pitch gradients in the CLC cell were observed using UV/Vis spectrometer and SEM technique.

Keywords:cholesteric liquid crystal;selective reflection;diffusion;pitch variation

[References]

Broer DJ, Lub J, Mol GN, Nature, 378(6556), 467 (1995)
Kreuzer FH, Andrejewski D, Haas W, Haberle N, Spes P, Mol. Cryst. Liq. Cryst., 199, 345 (1991)
Belayen SV, Schadt M, Barnik MI, Schmitt K, Jap. J. Appl. Phys., 29, 634 (1990)
Palffy-Muhoray P, Nature, 391(6669), 745 (1998)
Tsai ML, Chen SH, Macromol, 23, 1908 (1990)
Li L, Faris M, SPIE, 2873, 202 (1996)
Mitov M, Boudet A, Sopena P, Eur. Phys. J. B, 8, 327 (1999)
Bunning TJ, Mather PT, Liq. Cryst., 26, 557 (1999)
Binet C, Mitov M, Boudet A, Mol. Cryst. Liq. Cryst., 339, 111 (2000)
Li L, Faris SM, SID 96 Digest, 111 (1996)
Shannon PJ, Macromol, 17, 1873 (1984)
Broer DJ, Mol. Cryst. Liq. Cryst., 261, 513 (1995)
Kwon YJ, Lee WJ, Paek SH, Kim I, Song K, Mol. Cryst. Liq. Cryst., 377, 325 (2002)
Hikmet RAM, Kemperman H, Nature, 392(6675), 476 (1998)
Binet C, Mitov M, J. Appl. Phys., 90, 1730 (2001)
Kreuzer FH, Gawhary GW, U. S. Pat 4410,570 (1983)
Park H, Kim B, Kim W, Kim I, Song K, Polym.(Korea), 30(2), 182 (2006)
Clarson SJ, Dodgson K, Semlyen JA, Polymer, 26, 930 (1985)

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[1] Broer DJ, Lub J, Mol GN, Nature, 378(6556), 467 (1995)

[2] Kreuzer FH, Andrejewski D, Haas W, Haberle N, Spes P, Mol. Cryst. Liq. Cryst., 199, 345 (1991)

[3] Belayen SV, Schadt M, Barnik MI, Schmitt K, Jap. J. Appl. Phys., 29, 634 (1990)

[4] Palffy-Muhoray P, Nature, 391(6669), 745 (1998)

[5] Tsai ML, Chen SH, Macromol, 23, 1908 (1990)

[6] Li L, Faris M, SPIE, 2873, 202 (1996)

[7] Mitov M, Boudet A, Sopena P, Eur. Phys. J. B, 8, 327 (1999)

[8] Bunning TJ, Mather PT, Liq. Cryst., 26, 557 (1999)

[9] Binet C, Mitov M, Boudet A, Mol. Cryst. Liq. Cryst., 339, 111 (2000)

[10] Li L, Faris SM, SID 96 Digest, 111 (1996)

[11] Shannon PJ, Macromol, 17, 1873 (1984)

[12] Broer DJ, Mol. Cryst. Liq. Cryst., 261, 513 (1995)

[13] Kwon YJ, Lee WJ, Paek SH, Kim I, Song K, Mol. Cryst. Liq. Cryst., 377, 325 (2002)

[14] Hikmet RAM, Kemperman H, Nature, 392(6675), 476 (1998)

[15] Binet C, Mitov M, J. Appl. Phys., 90, 1730 (2001)

[16] Kreuzer FH, Gawhary GW, U. S. Pat 4410,570 (1983)

[17] Park H, Kim B, Kim W, Kim I, Song K, Polym.(Korea), 30(2), 182 (2006)

[18] Clarson SJ, Dodgson K, Semlyen JA, Polymer, 26, 930 (1985)