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Studies on binary mixtures of 4-pentyloxy-4'-cyanobiphenyl with three 4, 4'-di(alkoxy)azoxybenzenes

Jaishi B. R., Mandal P. K., Dąbrowski R.

Opto-Electronics Review

2010

Vol. 18, No. 2

111-120

Eighteen binary mixtures of 4-pentyloxy-4'-cyanobiphenyl (5OCB) and 4, 4'-di(alkoxy)azoxybenzenes (nOAB) with n = 5, 6, and 7 at different concentrations have been studied in detail. Over a wide concentration range, induced SmA phase was observed in all the mixtures except in one. In most of the mixtures, the refractive indices no, ne, and Δn lie between the values of pure components. The optical birefringence of the mixtures is found to decrease non-additively with concentration. The molecular polarizability anisotropy and the orientational order parameter < P2 > of the mixtures were calculated. Nature of variation of polarizability anisotropy with concentration is similar to that of Δn. In allmixtures < P2 > is more in smectic phase than in nematic phase and it also shows non-additive behaviour. Observed < P2 > values of the mixtures were compared with McMillan's and Maier-Saupe theoretical values and good agreement is found in some mixtures. The transition temperatures obtained by fitting < P2 > data to McMillan's theory agree with the observed values within a few degrees. Ratio of elastic constants K33 and K11 is determined for mixtures having nematic phase and found to diverge at TNA transition point.

The investigation of ∑(ri)² of liquid crystal molecule of homoloque CBn (5-9)

Adamski P.

Elektronika : konstrukcje, technologie, zastosowania

2006

Vol. 47, nr 5

45-47

The temperature dependence of the polarizability tensor components α || 1, α⊥ 1 and new quantity ∑(ri)² were investigated for homologue of CBn liquid crystals, For ache liquid crystal the new quantity ∑(ri)² was found for two temperature like the transition temperature to the solid state Tc and the transition temperature to the liquid TO. Both functions ∑(ri)²TC and ∑(ri)²TO are linear function of molecular weight but inclination of these functions are different. The cutting of these line gives us the values of molecular weight limited the range of existing of liquid crystals properties.

Badano temperaturowe zależności składowych tensora polaryzowalności cząsteczki α| |1, α⊥ 1 oraz nową wielkość ∑(ri)² homologu ciekłych kryształów CBn. Dla każdego ciekłego kryształu znaleziono wartości ∑(ri)² (suma kwantów odległości elektron proton w atomach cząsteczki) dla dwóch temperatur przejścia ciekłego kryształu do stanu ciała stałego ∑(ri)²TC oraz do ∑(ri)²TO. Obie funkcje masy ciekłych kryształów są liniowe i mają różne współczynniki nachylenia. Przecięcie tych linii daje ograniczenie występowania ciekłych kryształów.