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70349767843
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One of the referees has suggested the following experiment to distinguish the two possible sources for an observed memory effect. The aligned sample is temperature cycled through the isotropic phase outside the field. If the nematic alignment persists then one can conclude that gel restructuring has occurred.
-
One of the referees has suggested the following experiment to distinguish the two possible sources for an observed memory effect. The aligned sample is temperature cycled through the isotropic phase outside the field. If the nematic alignment persists then one can conclude that gel restructuring has occurred.
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E7 is a commercial LC mixture containing 51% 4′ -n-pentyl-4-cyanobiphenyl, 25% 4′ -n-heptyl-4-cyanobiphenyl, 16% 4′ -n-octoxy-4-cyanobiphenyl and 8% 4″ -n-pentyl-4-cyano-p-terphenyl.
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E7 is a commercial LC mixture containing 51% 4′ -n-pentyl-4-cyanobiphenyl, 25% 4′ -n-heptyl-4-cyanobiphenyl, 16% 4′ -n-octoxy-4-cyanobiphenyl and 8% 4″ -n-pentyl-4-cyano-p-terphenyl.
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All quantities in Eq. 2 should be in SI units. The Δχ values, given in CGS units in Ref., have been multiplied by 4π to convert them to values in SI units.
-
All quantities in Eq. 2 should be in SI units. The Δχ values, given in CGS units in Ref., have been multiplied by 4π to convert them to values in SI units.
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36
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70349775419
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For all the dispersions studied, the observed TIN is lower than that of the pure 5CB. Their values scatter about 0.4°C below the TIN of 5CB and within ranges of ±0.2°C and ±0.3°C for Alu C/5CB and Alu C 805/5CB, respectively. The more or less constant TIN values could be considered as indicating the presence of a shallow TIN minimum, which has been reported for aerosil/8CB dispersions with comparable void sizes. However, in view of the uncertainty in the measured TIN value (±0.20°C), we are reluctant to speculate relationships between Δ TIN and ρs values. We attribute the observed small variation of TIN with ρs to the limited range of void sizes covered in this study.
-
For all the dispersions studied, the observed TIN is lower than that of the pure 5CB. Their values scatter about 0.4°C below the TIN of 5CB and within ranges of ±0.2°C and ±0.3°C for Alu C/5CB and Alu C 805/5CB, respectively. The more or less constant TIN values could be considered as indicating the presence of a shallow TIN minimum, which has been reported for aerosil/8CB dispersions with comparable void sizes. However, in view of the uncertainty in the measured TIN value (±0.20°C), we are reluctant to speculate relationships between Δ TIN and ρs values. We attribute the observed small variation of TIN with ρs to the limited range of void sizes covered in this study.
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70349779091
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As suggested by the strong temperature dependence of ZFC spectra of Alu C/5CB ρs =0.10g/ cm3, shown in Fig. 3 left column, almost all domains will become aligned when the sample temperature reaches the TIN (36°C), i.e., before performing the IFC procedure. Thus, the well-aligned IFC spectrum of the same sample (Fig. 6, left column, second spectrum from the bottom) cannot be taken as evidence that IFC procedure is more effective in producing aligned states at ρs =0.10g/ cm3.
-
As suggested by the strong temperature dependence of ZFC spectra of Alu C/5CB ρs =0.10g/ cm3, shown in Fig. 3 left column, almost all domains will become aligned when the sample temperature reaches the TIN (36°C), i.e., before performing the IFC procedure. Thus, the well-aligned IFC spectrum of the same sample (Fig. 6, left column, second spectrum from the bottom) cannot be taken as evidence that IFC procedure is more effective in producing aligned states at ρs =0.10g/ cm3.
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Spectra were monitored after an initial waiting period of ∼10min to verify that the two-phase system had reached thermal equilibrium at the selected temperature as indicated by the identical spectra being observed in successive recordings.
-
Spectra were monitored after an initial waiting period of ∼10min to verify that the two-phase system had reached thermal equilibrium at the selected temperature as indicated by the identical spectra being observed in successive recordings.
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