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Flexoelectric coefficient measurements in the nematic liquid crystal phase of 5CB
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32. For example, the sign of (e1 + e3) for 5CB is reported as negative in Ref. 22, and positive in Ref. 24.
33. The value of |e3| for a certain bent-core material has been reported as 15.8 pC/m in Ref. 75 and as 62 000 pC/m in Ref. 31. However, this latter value has been shown theoretically to be essentially impossible.76
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46. P. Rudquist, The flexoelectro-optic effect in cholesteric liquid crystals, Ph.D. thesis, Chalmers University of Technology (1997) .
54. S.-E. Lee, S.-K. Lee, H.-S. Jin, W.-H. Park, K. Skjonnemand, D. Wilkes, K. Adlem, P. E. Saxton, and O. L. Parri, Patent No. WO/2011/137986 (2006).
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56. F. Castles, Highly flexoelectric liquid crystals, Ph.D. thesis, University of Cambridge (2010) .
58. The calculation required a value of the twist elastic constant, for which K2 = 3.3 pN was used (at a reduced temperature of ≈0.98 to be consistent with our other input values) from Ref. 61: although the essential result is not particularly sensitive to the exact value of K2 used.
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71. The temperature as determined by the readout of the hot-stage controller is precise (to the nearest 0.01°C), but not necessarily accurate. However, the value of Tc as determined using a hot-stage and hot-stage controller with a Fréedericksz cell was 35.51 °C, which supports the supplier's value.
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