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Cited by 10 publications
(4 citation statements)
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References 35 publications
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“…Both 5CB and 8CB, possessing a rather small K 33 / K 11 ratio, exhibited the BP when doped with ( R )- 1e . The K 33 / K 11 ratio of 5CB is in the range 1.2–1.4 at T IN – T = 2.6–15.0 K, and that of 8CB is the range 0.9–1.1 at T IN – T = 1–5 K , However, PCH-5 ( K 33 / K 11 = 1.96 at T IN – T = 16 K and K 33 / K 11 = 2.02 at T IN – T = 19 K) doped with ( R )- 1e did not exhibit BPs. These results indicate that a K 33 / K 11 < 1.4 is suitable for inducing stable BPs and that a K 33 / K 11 > 1.9 is too large for it.…”
Section: Resultsmentioning
confidence: 91%
“…Both 5CB and 8CB, possessing a rather small K 33 / K 11 ratio, exhibited the BP when doped with ( R )- 1e . The K 33 / K 11 ratio of 5CB is in the range 1.2–1.4 at T IN – T = 2.6–15.0 K, and that of 8CB is the range 0.9–1.1 at T IN – T = 1–5 K , However, PCH-5 ( K 33 / K 11 = 1.96 at T IN – T = 16 K and K 33 / K 11 = 2.02 at T IN – T = 19 K) doped with ( R )- 1e did not exhibit BPs. These results indicate that a K 33 / K 11 < 1.4 is suitable for inducing stable BPs and that a K 33 / K 11 > 1.9 is too large for it.…”
Section: Resultsmentioning
confidence: 91%
“…The compound 7AB [38,39] is a mesogenic material which shows a brilliant orange color corresponding to an absorption peak at about 442 nm (in the bulk). The mesomorphic behaviour, in the absence of UV illumination, is reported in Figure 1 and it is characterized by a nematic phase and a monotropic smectic A phase that can be supercooled down to room temperature.…”
Section: Experimental Section Materialsmentioning
confidence: 99%
“…In particular, density functional theory (DFT) is a useful tool to calculate both 14 N quadrupolar and chemical shift NMR tensors, as reported in the literature for several solid materials. [31][32][33][34][35][36][37] Herein, we report an original study of diheptylazobenzene (7AB) [38,39] in its nematic and smectic A phases (see Figure 1), based on a combined approach between experimental 14 N and 2 H NMR and DFT ab initio calculations. Previous studies on the 7AB mesogen, based on the sole 2 H NMR study of 7AB selectively deuterated in the aromatic core and/or in the alphamethyl position, [40][41][42][43] are limited to the determination of the main orientational order parameter, S zz , and to studying the impact of UV illumination on both molecular configurational changes and average S zz values.…”
Section: Introductionmentioning
confidence: 99%
“…Almost all the critical exponents determined experimentally are in the range 0.66-0.85. An increasing K3,/K1 ratio also favours the inset of striped instabilities in a homeotropic geometry[96]. Small values of K,, increase the steepness of the deformationholtage characteristic, which is desirable in multiplexed nematic displays.…”
mentioning
confidence: 96%