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  • American Institute of Physics (AIP)  (7)
  • 1
    Electronic Resource
    Electronic Resource
    Switching of negative and positive dielectro-anisotropic liquid crystals by in-plane electric fields (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 528-535 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This article compares switching behaviors between negative (Nn) and positive (Np) dielectro-anisotropic nematic liquid crystals driven by an in-plane electric field which is generated with interdigital electrodes. Even for Np type liquid crystals, excellent viewing angle characteristics were obtained as expected. Theoretical descriptions of the switching principle, i.e., threshold behavior and response mechanism, could be applied to both the Nn and Np type liquid crystals. However, the orientational deformation of the Np type liquid crystals caused by a distorted electric field which occurred near the edges of electrodes was not the same as that of the Nn type liquid crystals. The switching of the Np type liquid crystals near the edges of the electrodes by this field was followed by the in-plane switching of the liquid crystals between the electrodes. This remarkably distinctive dynamical behavior implied a difference in the response of the longitudinal axes for Nn and Np type liquid crystal molecules. The longitudinal axes of the latter seemed to be sensitive to the electric field component perpendicular to the substrates when applying the in-plane electric field. Furthermore, these experimentally obtained results were supported by computer simulations which analyzed the liquid crystal director distribution and transmittance pattern from edge-to-edge of a pair of electrodes when applying the in-plane electric field. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365611
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  • 2
    Electronic Resource
    Electronic Resource
    Threshold behavior analysis of in-plane switching mode liquid-crystal cells with asymmetrical surface condition (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 3477-3479 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The threshold behavior of the in-plane switching (IPS) mode liquid-crystal cells with different (asymmetric) anchoring strength at two liquid-crystal/substrate interfaces was investigated by linear stability analysis. Similarity in stability characteristics between the IPS mode and the surface stabilized ferroelectric mode was clarified. The analysis showed that, with parallel rubbing of the two substrate surfaces, only the (symmetric) switching initialized from the center of the liquid-crystal layer will occur even with the asymmetric surface condition. This means that the basic switching process of the IPS mode does not change with the asymmetricities of the surface conditions. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124133
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  • 3
    Electronic Resource
    Electronic Resource
    Cell gap margin enlargement of in-plane switching mode liquid crystal displays using weak-anchoring effects (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 803-805 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A method to enlarge the allowable range of marginal variation of the cell gap to ensure uniform brightness of in-plane switching mode liquid crystal displays is proposed. The proposed method is based on enlargement of the effective cell gap using the extrapolation length that is generated with weak-anchoring effects at liquid crystal/alignment layer interfaces. The method is evaluated with simulations and experiments. The results support the effectiveness of the method. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123373
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  • 4
    Electronic Resource
    Electronic Resource
    Simple model for patterned bidirectional anchoring of nematic liquid crystal and its bistability (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 374-376 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An effective anchoring model for the patterned surface with bidirectional rubbing by atomic force microscope was proposed. The model was a simple additive function of two bidirectional anchoring contributions of the patterned surface, with consideration of higher-order terms of the anchoring function. The bistable switching behavior of the nematic liquid crystal cells with the patterned surface was investigated analytically and numerically using this anchoring model. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1435070
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  • 5
    Electronic Resource
    Electronic Resource
    Surface alignment bistability of nematic liquid crystals by orientationally frustrated surface patterns (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 3055-3057 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We demonstrate a robust in-plane bistability of liquid-crystal surface alignment based on tailored submicrometer-sized surface domains imposing a frustrated alignment. By a nanorubbing technique utilizing the atomic force microscope, we prepared an orientational checkerboard pattern on polyimide layer, consisting of square unit domains on which the alignment is locally constrained to be planar yet orthogonal between the neighboring domains. Due to the four-fold rotational symmetry of the pattern, the two diagonal axes of the square domain become equally stable directions for the macroscopic liquid crystal alignment. The alignment could be switched between these two states by an in-plane electric field above a certain threshold, determined by the local azimuthal anchoring. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1371246
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  • 6
    Electronic Resource
    Electronic Resource
    Hydrogen bond-induced nanosegregation in the thermotropic cubic phase forming molecule, BABH8 (2002)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 116 (2002), S. 5753-5758 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Local-structures of a thermotropic cubic phase forming molecule, 1,2-bis-[4-n-octyloxy benzoyl]-hydrazine (BABH8) were studied by molecular dynamics simulations. Spontaneous formation of hydrogen bond networks and smectic ordered clusters were obtained in these simulations. Furthermore, spontaneous segregation was observed in the simulations with the artificial binary system which was composed separately of BABH8 mesogen cores and alkyl tails. These results indicate that the BABH8 core and tails have a strong tendency to segregate and the smectic order formation is promoted by intermolecular hydrogen-bonding of the core hydrazine group. Connections between this segregation character and cubic phase formation were discussed. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1454989
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  • 7
    Electronic Resource
    Electronic Resource
    Chirality induction from chiral molecules to adsorbed monolayers (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 9532-9538 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Monolayer structures of a chiral mesogen, (R)- or (S)-[4′-(1-methylheptyloxy)-3′-nitrobiphenyl-4yl] 4-(trans-5-decenyloxy) benzoate, adsorbed on graphite were investigated by molecular dynamics simulations to clarify the mechanism of chirality inductions from chiral mesogens to chiral monolayers. We propose a molecular model that is based on coupling between the up-down symmetry breaking and the molecular tilt direction symmetry breaking of the monolayer. From the proposed model, we further predict alternative reversal of the two dimensional chirality of the monolayer when the chiral carbon is shifted along alkyl chain. This is a two-dimensional analogue of the "odd-even" effect on twist sense reversal in bulk chiral nematic systems. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1369162
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