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  • Order parameter and crossover temperature from temperature-dependent refractive indices for low birefringence liquid crystals [Elektronski vir]
    Ranjkesh Siahkal, Amid ...
    The temperature dependencies of three low birefringence (delta n) liquid crystals (LCs) at similar clearing temperatures (TNI) were investigated to characterize the order parameter S(T) and crossover ... temperature (Tco). Three different methods were used to determine the S(T) property, including the Vuks model, the Haller approximation model, and a model based on the effective geometry parameter (alfa eg). In our low delta n LCs with relatively analogous TNI, three parameters (B, (delta n)o, and beta) that originated from the modified four-parameter model were analyzed to increase the Tco condition. A larger absolute value for the B parameter and a smaller beta parameter were also needed to reduce the temperature dependence of delta n. In particular, a lower (deltan)o value was found to be beneficial for increasing the Tco value, which resulted in a higher Tco value for the low delta n LCs, compared with that of a high delta n LC with a similar TNI value. This led to a narrower temperature range between Tco and TNI for the low delta n LCs compared to that of the high delta n LC, which could result in appropriate temperature properties for LCs for practical display applications, including a lower temperature dependence of delta n and wider operational temperature regime.
    Source: Journal of molecular liquids [Elektronski vir]. - ISSN 1873-3166 (Vol. 230, 2017, Str. 280-289)
    Type of material - e-article ; adult, serious
    Publish date - 2017
    Language - english
    COBISS.SI-ID - 95133441
    DOI

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