서지주요정보
표면안정화 강유전성 액정의 유전율 연구 = Study on dielectric response of surface-stabilized ferroelectric liquid crystals
서명 / 저자 표면안정화 강유전성 액정의 유전율 연구 = Study on dielectric response of surface-stabilized ferroelectric liquid crystals / 왕종민.
저자명 왕종민 ; Wang, Jong-Min
발행사항 [대전 : 한국과학기술원, 2000].
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소장정보

등록번호

8011399

소장위치/청구기호

학술문화관(문화관) 보존서고

DPH 00029

SMS전송

도서상태

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초록정보

Very broad low frequency dielectric data of a surface stabilized ferroelectric liquid crystal (SSFLC) sample in the frequency(ω) domain was analyzed by use of the Tikhonov regularization method to derive three distinctive modes of relaxation in time (τ) domain as corresponding to the X-mode, D-mode, and L-mode. The mode dependence on the probe field strength was studied in detail for two different cases of surface treatments: one with the indium tin oxide (ITO ) coating only and the other with polyimide dressing and rubbing alignment on top of the ITO coating. Origins of the three relaxation modes were discussed on the basis of the observed effects of the different surface treatments, probe field strength, and probing frequency. In addition, we have studied temperature dependent behaviors of two low frequency dielectricrelaxation modes; space charge accumulation and X-mode, observed in a sample of surface-stabilzed ferroelectric liquid crystal(SSFLC). From Cole-Cole plot studies a separate temperature dependence of dielectric strength △ε and relaxation frequency $\omega_r$ for the two low frequency modes was obtained and found to follow an Arrhenius relation in the respective asymptotic regions far from the phase transition temperatures. From the Arrhenius plots we could obtain the activation energies of △U = 0.42 eV for space charge accumulation and 0.13 eV for X-mode deformation respectively. Temperature dependence of rotational viscosity in the SmC* phase was also found to be in conformity with the temperature dependence derived from the X-mode parameters in the effective Debye relaxation regime.

서지기타정보

서지기타정보
청구기호 {DPH 00029
형태사항 70 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Jong-Min Wang
지도교수의 한글표기 : 김종진
지도교수의 영문표기 : Jong-Jean Kim
수록잡지명 : "Low frequency dielectric relaxations in surface-stabilized ferroelectric liquid crystal". Molecular crystals and liquid crystals, , (2000)
수록잡지명 : "Mode analysis of low frequency dielectric losses in surface-stabilized ferroelectric liquid crystal". Ferroelectrics, , (2000)
학위논문 학위논문(박사) - 한국과학기술원 : 물리학과,
서지주기 참고문헌 : p. 63-66
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