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Induced smectic phases in phase diagrams of binary nematic liquid crystal mixtures
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10.1063/1.3567100
/content/aip/journal/jcp/134/12/10.1063/1.3567100
http://aip.metastore.ingenta.com/content/aip/journal/jcp/134/12/10.1063/1.3567100
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Figures

Image of FIG. 1.
FIG. 1.

(a) Variation of crystalline (ψ), layered (σ), and orientational (s) order parameters of hypothetic binary liquid crystal mixtures as a function of temperature calculated using c = 1.2, β 12 = 1.45, and γ 12 = 0. The 60/40 composition follows the phase transition in the sequence of Cr–SA–N–I transition with temperature along with the induced SA phase (that is absent in the 99/1 composition) and a higher N–I transition temperature. The inset shows the enlarged plot of the crystalline order parameters versus temperature. (b) Temperature dependence of anisotropic free energy curves calculated with the same interaction parameters, showing the dominance of various mesophase ordering in the anisotropic free energy as a function of temperature and composition.

Image of FIG. 2.
FIG. 2.

Temperature versus composition phase diagram calculated for various cases of (a) β 12 = 1, (b) β 12 = 1.45, and (c) β 12 = 2, showing the expansion of induced SA phase with increasing the layered interaction parameter, β 12.

Image of FIG. 3.
FIG. 3.

Experimental phase diagram a mixture of 4-cyano-4-pentyloxy biphenyl, 5OCB, and 4-pentylphenyl-4-heptyloxybenzoate, 7O5 (Ref. 36), in comparison with the calculated phase diagram. Triangles represent the experimental data, whereas the solid lines represent the theoretical binodal lines.

Image of FIG. 4.
FIG. 4.

(a) Variation of crystalline (ψ), layered (σ), hexagonal (η), and orientational (s) order parameters of hypothetic binary liquid crystal mixtures as a function of temperature calculated using c = 1.2, β 12 = 1.45, and γ 12 = 1.03. The 50/50 composition follows the phase transition in the sequence of SB–N –I transition with temperature, while showing induced SB phase not shown in the 99/1 composition and higher N–I transition temperature. (b) Temperature dependence of anisotropic free energy curves calculated with the same interaction parameters, showing the dominance of various mesophase ordering in the anisotropic free energy as a function of temperature and composition.

Image of FIG. 5.
FIG. 5.

Temperature versus composition phase diagram calculated using (a) γ 12 = 0.95, (c) γ 12 = 1.03, and (d) γ 12 = 1.2, showing the expansion of induced SB phase with the strength of the cross-hexagonal interaction, γ 12 (keeping c = 1.2 and β 12 = 1.45). (b) Zoom-in phase diagram of (a) shows the SA + SB coexistence gap in conjunction with triple points of Cr2–SA–SB, N–SA–SB, and SA–SB–N.

Image of FIG. 6.
FIG. 6.

Comparison between the self-consistently calculated lines and the experimental phase diagram of the mixture of 4′-n-pentyl-4-cyanobiphenyl, 5CB, and 4′-methoxy-benzylidene-4-butylaniline, MBBA. Triangles and open diamonds are from the present work, whereas the open circles are replotted from Rauch et al. (Ref. 4), and solid lines represent the theoretical binodal lines which interpret the isotropic, nematic, smectic B phases and the coexistence regions among these phases. The polarized optical micrographs show the morphology of various phase regions indicated by cross symbol (x) in the phase diagram: (a) isotropic (I), (b) nematic (N), (c) smectic B (SB), (d) nematic + smectic B (N + SB), (e) crystalline + smectic B (Cr2 + SB), and (f) smectic E (SE) regions.

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/content/aip/journal/jcp/134/12/10.1063/1.3567100
2011-03-25
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Induced smectic phases in phase diagrams of binary nematic liquid crystal mixtures
http://aip.metastore.ingenta.com/content/aip/journal/jcp/134/12/10.1063/1.3567100
10.1063/1.3567100
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